LAMPS M. Ounsworth Internet-Draft J. Gray Intended status: Standards Track Entrust Expires: 20 December 2025 M. Pala OpenCA Labs J. Klaussner Bundesdruckerei GmbH S. Fluhrer Cisco Systems 18 June 2025 Composite ML-DSA for use in X.509 Public Key Infrastructure draft-ietf-lamps-pq-composite-sigs-06 Abstract This document defines combinations of ML-DSA [FIPS.204] in hybrid with traditional algorithms RSASSA-PKCS1-v1_5, RSASSA-PSS, ECDSA, Ed25519, and Ed448. These combinations are tailored to meet security best practices and regulatory guidelines. Composite ML-DSA is applicable in any application that uses X.509 or PKIX data structures that accept ML-DSA, but where the operator wants extra protection against breaks or catastrophic bugs in ML-DSA. About This Document This note is to be removed before publishing as an RFC. The latest revision of this draft can be found at https://lamps- wg.github.io/draft-composite-sigs/draft-ietf-lamps-pq-composite- sigs.html. Status information for this document may be found at https://datatracker.ietf.org/doc/draft-ietf-lamps-pq-composite-sigs/. Discussion of this document takes place on the LAMPS Working Group mailing list (mailto:spams@ietf.org), which is archived at https://datatracker.ietf.org/wg/lamps/about/. Subscribe at https://www.ietf.org/mailman/listinfo/spams/. Source for this draft and an issue tracker can be found at https://github.com/lamps-wg/draft-composite-sigs. Status of This Memo This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79. Ounsworth, et al. Expires 20 December 2025 [Page 1] Internet-Draft Composite ML-DSA June 2025 Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet- Drafts is at https://datatracker.ietf.org/drafts/current/. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." This Internet-Draft will expire on 20 December 2025. Copyright Notice Copyright (c) 2025 IETF Trust and the persons identified as the document authors. All rights reserved. This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (https://trustee.ietf.org/ license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Revised BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Revised BSD License. Table of Contents 1. Changes in -06 . . . . . . . . . . . . . . . . . . . . . . . 3 2. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 4 2.1. Conventions and Terminology . . . . . . . . . . . . . . . 5 2.2. Composite Design Philosophy . . . . . . . . . . . . . . . 6 3. Overview of the Composite ML-DSA Signature Scheme . . . . . . 7 3.1. Pre-hashing and Randomizer . . . . . . . . . . . . . . . 8 3.2. Prefix, Domain Separators and CTX . . . . . . . . . . . . 9 4. Composite ML-DSA Functions . . . . . . . . . . . . . . . . . 9 4.1. Key Generation . . . . . . . . . . . . . . . . . . . . . 9 4.2. Sign . . . . . . . . . . . . . . . . . . . . . . . . . . 11 4.3. Verify . . . . . . . . . . . . . . . . . . . . . . . . . 14 5. Serialization . . . . . . . . . . . . . . . . . . . . . . . . 16 5.1. SerializePublicKey and DeserializePublicKey . . . . . . . 17 5.2. SerializePrivateKey and DeserializePrivateKey . . . . . . 20 5.3. SerializeSignatureValue and DeserializeSignatureValue . . 21 6. Use within X.509 and PKIX . . . . . . . . . . . . . . . . . . 23 6.1. Encoding to DER . . . . . . . . . . . . . . . . . . . . . 24 6.2. Key Usage Bits . . . . . . . . . . . . . . . . . . . . . 24 6.3. ASN.1 Definitions . . . . . . . . . . . . . . . . . . . . 25 7. Algorithm Identifiers . . . . . . . . . . . . . . . . . . . . 27 Ounsworth, et al. Expires 20 December 2025 [Page 2] Internet-Draft Composite ML-DSA June 2025 7.1. Domain Separator Values . . . . . . . . . . . . . . . . . 29 7.2. Rationale for choices . . . . . . . . . . . . . . . . . . 31 7.3. RSASSA-PSS Parameters . . . . . . . . . . . . . . . . . . 31 8. ASN.1 Module . . . . . . . . . . . . . . . . . . . . . . . . 32 9. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 39 9.1. Object Identifier Allocations . . . . . . . . . . . . . . 39 9.1.1. Module Registration . . . . . . . . . . . . . . . . . 39 9.1.2. Object Identifier Registrations . . . . . . . . . . . 39 10. Security Considerations . . . . . . . . . . . . . . . . . . . 43 10.1. Why Hybrids? . . . . . . . . . . . . . . . . . . . . . . 43 10.2. Non-separability, EUF-CMA and SUF . . . . . . . . . . . 43 10.2.1. Implications of multiple encodings . . . . . . . . . 45 10.3. Key Reuse . . . . . . . . . . . . . . . . . . . . . . . 45 10.4. Use of Prefix for attack mitigation . . . . . . . . . . 47 10.5. Implications of signature randomizer . . . . . . . . . . 47 10.6. Policy for Deprecated and Acceptable Algorithms . . . . 47 11. Implementation Considerations . . . . . . . . . . . . . . . . 48 11.1. FIPS certification . . . . . . . . . . . . . . . . . . . 48 11.2. Backwards Compatibility . . . . . . . . . . . . . . . . 49 11.3. Profiling down the number of options . . . . . . . . . . 49 11.4. External Pre-hashing . . . . . . . . . . . . . . . . . . 50 12. References . . . . . . . . . . . . . . . . . . . . . . . . . 52 12.1. Normative References . . . . . . . . . . . . . . . . . . 52 12.2. Informative References . . . . . . . . . . . . . . . . . 55 Appendix A. Approximate Key and Signature Sizes . . . . . . . . 57 Appendix B. Component Algorithm Reference . . . . . . . . . . . 60 Appendix C. Component AlgorithmIdentifiers for Public Keys and Signatures . . . . . . . . . . . . . . . . . . . . . . . 61 Appendix D. Message Representative Examples . . . . . . . . . . 69 Appendix E. Test Vectors . . . . . . . . . . . . . . . . . . . . 72 Appendix F. Intellectual Property Considerations . . . . . . . . 188 Appendix G. Contributors and Acknowledgements . . . . . . . . . 188 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 189 1. Changes in -06 Interop-affecting changes: * Removed the pre-hash randomizer PH(r || M) and replaced it with PH(M). The Message representative is now M' := Prefix || Domain || len(ctx) || ctx || r || PH( M ). * Added new prototype OIDs to avoid interoperability issues with previous versions. * clarified use of SHAKE256 with 64 byte output. Editorial changes: Ounsworth, et al. Expires 20 December 2025 [Page 3] Internet-Draft Composite ML-DSA June 2025 * Removed the extra test vector for MLDSA87-RSA4096-PSS-SHA512. Still to do in a future version: * Nothing. Authors believe this version to be complete. 2. Introduction The advent of quantum computing poses a significant threat to current cryptographic systems. Traditional cryptographic signature algorithms such as RSA, DSA and its elliptic curve variants are vulnerable to quantum attacks. During the transition to post-quantum cryptography (PQC), there is considerable uncertainty regarding the robustness of both existing and new cryptographic algorithms. While we can no longer fully trust traditional cryptography, we also cannot immediately place complete trust in post-quantum replacements until they have undergone extensive scrutiny and real-world testing to uncover and rectify both algorithmic weaknesses as well as implementation flaws across all the new implementations. Unlike previous migrations between cryptographic algorithms, the decision of when to migrate and which algorithms to adopt is far from straightforward. For instance, the aggressive migration timelines may require deploying PQC algorithms before their implementations have been fully hardened or certified, and dual-algorithm data protection may be desirable over a longer time period to hedge against CVEs and other implementation flaws in the new implementations. Cautious implementers may opt to combine cryptographic algorithms in such a way that an attacker would need to break all of them simultaneously to compromise the protected data. These mechanisms are referred to as Post-Quantum/Traditional (PQ/T) Hybrids [I-D.ietf-pquip-pqt-hybrid-terminology]. Certain jurisdictions are already recommending or mandating that PQC lattice schemes be used exclusively within a PQ/T hybrid framework. The use of a composite scheme provides a straightforward implementation of hybrid solutions compatible with (and advocated by) some governments and cybersecurity agencies [BSI2021], [ANSSI2024]. This specification defines a specific instantiation of the PQ/T Hybrid paradigm called "composite" where multiple cryptographic algorithms are combined to form a single signature algorithm presenting a single public key and signature value such that it can be treated as a single atomic algorithm at the protocol level; a property referred to as "protocol backwards compatibility" since it can be applied to protocols that are not explicitly hybrid-aware. Ounsworth, et al. Expires 20 December 2025 [Page 4] Internet-Draft Composite ML-DSA June 2025 Composite algorithms address algorithm strength uncertainty because the composite algorithm remains strong so long as one of its components remains strong. Concrete instantiations of composite ML- DSA algorithms are provided based on ML-DSA, RSASSA-PKCS1-v1_5, RSASSA-PSS, ECDSA, Ed25519, and Ed448. Backwards compatibility in the sense of upgraded systems continuing to inter-operate with legacy systems is not directly covered in this specification, but is the subject of Section 11.2. Composite ML-DSA is applicable in any PKIX-related application that would otherwise use ML-DSA. 2.1. Conventions and Terminology The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all capitals, as shown here. These words may also appear in this document in lower case as plain English words, absent their normative meanings. This specification is consistent with the terminology defined in [I-D.ietf-pquip-pqt-hybrid-terminology]. In addition, the following terminology is used throughout this specification: *ALGORITHM*: The usage of the term "algorithm" within this specification generally refers to any function which has a registered Object Identifier (OID) for use within an ASN.1 AlgorithmIdentifier. This loosely, but not precisely, aligns with the definitions of "cryptographic algorithm" and "cryptographic scheme" given in [I-D.ietf-pquip-pqt-hybrid-terminology]. *COMPONENT / PRIMITIVE*: The words "component" or "primitive" are used interchangeably to refer to a cryptographic algorithm that is used internally within a composite algorithm. For example this could be an asymmetric algorithm such as "ML-DSA-65" or "RSASSA-PSS", or a Hash such as "SHA256". *DER*: Distinguished Encoding Rules as defined in [X.690]. *PKI*: Public Key Infrastructure, as defined in [RFC5280]. *SIGNATURE*: A digital cryptographic signature, making no assumptions about which algorithm. Notation: The algorithm descriptions use python-like syntax. The following symbols deserve special mention: Ounsworth, et al. Expires 20 December 2025 [Page 5] Internet-Draft Composite ML-DSA June 2025 * || represents concatenation of two byte arrays. * [:] represents byte array slicing. * (a, b) represents a pair of values a and b. Typically this indicates that a function returns multiple values; the exact conveyance mechanism -- tuple, struct, output parameters, etc -- is left to the implementer. * (a, _): represents a pair of values where one -- the second one in this case -- is ignored. * Func(): represents a function that is parametrized by meaning that the function's implementation will have minor differences depending on the underlying TYPE. Typically this means that a function will need to look up different constants or use different underlying cryptographic primitives depending on which composite algorithm it is implementing. 2.2. Composite Design Philosophy [I-D.ietf-pquip-pqt-hybrid-terminology] defines composites as: _Composite Cryptographic Element_: A cryptographic element that incorporates multiple component cryptographic elements of the same type in a multi-algorithm scheme. Composite algorithms, as defined in this specification, follow this definition and should be regarded as a single key that performs a single cryptographic operation typical of a digital signature algorithm, such as key generation, signing, or verifying -- using its internal sequence of component keys as if they form a single key. This generally means that the complexity of combining algorithms can and should be handled by the cryptographic library or cryptographic module, and the single composite public key, private key, and signature value can be carried in existing fields in protocols such as PKCS#10 [RFC2986], CMP [RFC4210], X.509 [RFC5280], the CMS [RFC5652], and the Trust Anchor Format [RFC5914]. In this way, composites achieve "protocol backwards-compatibility" in that they will drop cleanly into any protocol that accepts an analogous single- algorithm cryptographic scheme without requiring any modification of the protocol to handle multiple algorithms. Discussion of the specific choices of algorithm pairings can be found in Section 7.2. Ounsworth, et al. Expires 20 December 2025 [Page 6] Internet-Draft Composite ML-DSA June 2025 3. Overview of the Composite ML-DSA Signature Scheme Composite ML-DSA is a Post-Quantum / Traditional hybrid signature scheme which combines ML-DSA as specified in [FIPS.204] and [I-D.ietf-lamps-dilithium-certificates] with one of RSASSA-PKCS1-v1_5 or RSASSA-PSS algorithms defined in [RFC8017], the Elliptic Curve Digital Signature Algorithm ECDSA scheme defined in section 6 of [FIPS.186-5], or Ed25519 / Ed448 defined in [RFC8410]. The two component signatures are combined into a composite algorithm via a "signature combiner" function which performs randomized pre-hashing and prepends several domain separator values to the message prior to passing it to the component algorithms. Composite ML-DSA achieves weak non-separability as well as several other security properties which are described in the Security Considerations in Section 10. Composite signature schemes are defined as cryptographic primitives that consist of three algorithms: * KeyGen() -> (pk, sk): A probabilistic key generation algorithm which generates a public key pk and a secret key sk. Some cryptographic modules may also expose a KeyGen(seed) -> (pk, sk), which generates pk and sk deterministically from a seed. This specification assumes a seed-based keygen for ML-DSA. * Sign(sk, M) -> s: A signing algorithm which takes as input a secret key sk and a message M, and outputs a signature s. Signing routines may take additional parameters such as a context string or a hash function to use for pre-hashing the message. * Verify(pk, M, s) -> true or false: A verification algorithm which takes as input a public key pk, a message M and a signature s, and outputs true if the signature verifies correctly and false or an error otherwise. Verification routines may take additional parameters such as a context string or a hash function to use for pre-hashing the message. The following algorithms are defined for serializing and deserializing component values. These algorithms are inspired by similar algorithms in [RFC9180]. * SerializePublicKey(mlkdsaPK, tradPK) -> bytes: Produce a byte string encoding of the component public keys. * DeserializePublicKey(bytes) -> (mldsaPK, tradPK): Parse a byte string to recover the component public keys. Ounsworth, et al. Expires 20 December 2025 [Page 7] Internet-Draft Composite ML-DSA June 2025 * SerializePrivateKey(mldsaSeed, tradSK) -> bytes: Produce a byte string encoding of the component private keys. Note that the keygen seed is used as the interoperable private key format for ML-DSA. * DeserializePrivateKey(bytes) -> (mlkemSeed, tradSK): Parse a byte string to recover the component private keys. * SerializeSignatureValue(r, mldsaSig, tradSig) -> bytes: Produce a byte string encoding of the component signature values. The randomizer r is explained in Section 3.1. * DeserializeSignatureValue(bytes) -> (r, mldsaSig, tradSig): Parse a byte string to recover the randomizer and the component signature values. Full definitions of serialization and deserialization algorithms can be found in Section 5. 3.1. Pre-hashing and Randomizer In [FIPS.204] NIST defines separate algorithms for pure and pre- hashed modes of ML-DSA, referred to as "ML-DSA" and "HashML-DSA" respectively. This specification defines a single mode which is similar in construction to HashML-DSA with the addition of a pre-hash randomizer inspired by [BonehShoup]. See Section 10.5 for detailed discussion of the security properties of the randomized pre-hash. This design provides a compromised balance between performance and security. Since pre-hashing is done at the composite level, "pure" ML-DSA is used as the underlying ML-DSA primitive. The primary design motivation behind pre-hashing is to perform only a single pass over the potentially large input message M, compared to passing the full message to both component primitives, and to allow for optimizations in cases such as signing the same message digest with multiple different keys. The actual length of the to-be-signed message M' depends on the application context ctx provided at runtime but since ctx has a maximum length of 255 bytes, M' has a fixed maximum length which depends on the output size of the hash function chosen as PH, but can be computed per composite algorithm. This simplification into a single strongly-pre-hashed algorithm avoids the need for duplicate sets of "Composite-ML-DSA" and "Hash- Composite-ML-DSA" algorithms. See Section 10.5 for a discussion of security implications of the randomized pre-hash. Ounsworth, et al. Expires 20 December 2025 [Page 8] Internet-Draft Composite ML-DSA June 2025 See Section 11.4 for a discussion of externalizing the pre-hashing step. 3.2. Prefix, Domain Separators and CTX When constructing the to-be-signed message representative M', several domain separator values are pre-pended to the message pre-hash prior to signing. M' := Prefix || Domain || len(ctx) || ctx || r || PH( M ) First a fixed prefix string is pre-pended which is the byte encoding of the ASCII string "CompositeAlgorithmSignatures2025" which in hex is: 436F6D706F73697465416C676F726974686D5369676E61747572657332303235 Additional discussion of the prefix can be found in Section 10.4. Next, the Domain separator defined in Section 7.1 which is the DER encoding of the OID of the specific composite algorithm is concatenated with the length of the context in bytes, the context, the randomizer r, and finally the hash of the message to be signed. The Domain separator serves to bind the signature to the specific composite algorithm used. The context string allows for applications to bind the signature to some application context. The randomizer is described in detail in Section 3.1. Note that there are two different context strings ctx at play: the first is the application context that is passed in to Composite-ML- DSA.Sign and bound to the to-be-signed message M'. The second is the ctx that is passed down into the underlying ML-DSA.Sign and here Composite ML-DSA itself is the application that we wish to bind and so the DER-encoded OID of the composite algorithm, called Domain, is used as the ctx for the underlying ML-DSA primitive. 4. Composite ML-DSA Functions This section describes the composite ML-DSA functions needed to instantiate the public API of a digital signature scheme as defined in Section 3. 4.1. Key Generation In order to maintain security properties of the composite, applications that use composite keys MUST always perform fresh key generations of both component keys and MUST NOT reuse existing key material. See Section 10.3 for a discussion. Ounsworth, et al. Expires 20 December 2025 [Page 9] Internet-Draft Composite ML-DSA June 2025 To generate a new key pair for composite schemes, the KeyGen() -> (pk, sk) function is used. The KeyGen() function calls the two key generation functions of the component algorithms independently. Multi-process or multi-threaded applications might choose to execute the key generation functions in parallel for better key generation performance. The following describes how to instantiate a KeyGen() function for a given composite algorithm represented by . Composite-ML-DSA.KeyGen() -> (pk, sk) Explicit inputs: None Implicit inputs mapped from : ML-DSA The underlying ML-DSA algorithm and parameter set, for example, could be "ML-DSA-65". Trad The underlying traditional algorithm and parameter set, for example "RSASSA-PSS" or "Ed25519". Output: (pk, sk) The composite key pair. Key Generation Process: 1. Generate component keys mldsaSeed = Random(32) (mldsaPK, _) = ML-DSA.KeyGen(mldsaSeed) (tradPK, tradSK) = Trad.KeyGen() 2. Check for component key gen failure if NOT (mldsaPK, mldsaSK) or NOT (tradPK, tradSK): output "Key generation error" 3. Output the composite public and private keys pk = SerializePublicKey(mldsaPK, tradPK) sk = SerializePrivateKey(mldsaSeed, tradSK) return (pk, sk) Ounsworth, et al. Expires 20 December 2025 [Page 10] Internet-Draft Composite ML-DSA June 2025 Figure 1: Composite-ML-DSA.KeyGen() -> (pk, sk) In order to ensure fresh keys, the key generation functions MUST be executed for both component algorithms. Compliant parties MUST NOT use, import or export component keys that are used in other contexts, combinations, or by themselves as keys for standalone algorithm use. For more details on the security considerations around key reuse, see section Section 10.3. Note that in step 2 above, both component key generation processes are invoked, and no indication is given about which one failed. This SHOULD be done in a timing-invariant way to prevent side-channel attackers from learning which component algorithm failed. Variations in the keygen process above and signature processes below to accommodate particular private key storage mechanisms or alternate interfaces to the underlying cryptographic modules are considered to be conformant to this specification so long as they produce the same output and error handling. For example, component private keys stored in separate software or hardware modules where it is not possible to do a joint simultaneous keygen would be considered compliant so long as both keys are freshly generated. It is also possible that the underlying cryptographic module does not expose a ML-DSA.KeyGen(seed) that accepts an externally-generated seed, and instead an alternate keygen interface must be used. Note however that cryptographic modules that do not support seed-based ML-DSA key generation will be incapable of importing or exporting composite keys in the standard format since the private key serialization routines defined in Section 5.2 only support ML-DSA keys as seeds. 4.2. Sign The Sign() algorithm of Composite ML-DSA mirrors the construction of ML-DSA.Sign(sk, M, ctx) defined in Algorithm 3 Section 5.2 of [FIPS.204]. Composite ML-DSA exposes an API similar to that of ML- DSA, despite the fact that it includes pre-hashing in a similar way to HashML-DSA. Internally it uses pure ML-DSA as the component algorithm since there is no advantage to pre-hashing twice. See Section 3.1 for a discussion of the pre-hashed design and randomizer r. See Section 3.2 for a discussion on the domain separator and context values. See Section 11.4 for a discussion of externalizing the pre-hashing step. Ounsworth, et al. Expires 20 December 2025 [Page 11] Internet-Draft Composite ML-DSA June 2025 The following describes how to instantiate a Sign() function for a given Composite ML-DSA algorithm represented by . Composite-ML-DSA.Sign(sk, M, ctx) -> s Explicit inputs: sk Composite private key consisting of signing private keys for each component. M The message to be signed, an octet string. ctx The application context string used in the composite signature combiner, which defaults to the empty string. Implicit inputs mapped from : ML-DSA The underlying ML-DSA algorithm and parameter set, for example, could be "ML-DSA-65". Trad The underlying traditional algorithm and parameter set, for example "RSASSA-PSS with id-sha256" or "Ed25519". Prefix The prefix String which is the byte encoding of the String "CompositeAlgorithmSignatures2025" which in hex is 436F6D706F73697465416C676F726974686D5369676E61747572657332303235 Domain Domain separator value for binding the signature to the Composite ML-DSA OID. Additionally, the composite Domain is passed into the underlying ML-DSA primitive as the ctx. Domain values are defined in the "Domain Separator Values" section below. PH The hash function to use for pre-hashing. Output: s The composite signature value. Signature Generation Process: 1. If len(ctx) > 255: return error 2. Compute the Message representative M'. As in FIPS 204, len(ctx) is encoded as a single unsigned byte. Ounsworth, et al. Expires 20 December 2025 [Page 12] Internet-Draft Composite ML-DSA June 2025 Randomize the message representative r = Random(32) M' := Prefix || Domain || len(ctx) || ctx || r || PH( M ) 3. Separate the private key into component keys and re-generate the ML-DSA key from seed. (mldsaSeed, tradSK) = DeserializePrivateKey(sk) (_, mldsaSK) = ML-DSA.KeyGen(mldsaSeed) 4. Generate the two component signatures independently by calculating the signature over M' according to their algorithm specifications. mldsaSig = ML-DSA.Sign( mldsaSK, M', ctx=Domain ) tradSig = Trad.Sign( tradSK, M' ) 5. If either ML-DSA.Sign() or Trad.Sign() return an error, then this process MUST return an error. if NOT mldsaSig or NOT tradSig: output "Signature generation error" 6. Output the encoded composite signature value. s = SerializeSignatureValue(r, mldsaSig, tradSig) return s Figure 2: Composite-ML-DSA.Sign(sk, M, ctx) -> s Note that in step 4 above, both component signature processes are invoked, and no indication is given about which one failed. This SHOULD be done in a timing-invariant way to prevent side-channel attackers from learning which component algorithm failed. It is possible to use component private keys stored in separate software or hardware keystores. Variations in the process to accommodate particular private key storage mechanisms are considered to be conformant to this specification so long as it produces the same output and error handling as the process sketched above. Ounsworth, et al. Expires 20 December 2025 [Page 13] Internet-Draft Composite ML-DSA June 2025 4.3. Verify The Verify() algorithm of Composite ML-DSA mirrors the construction of ML-DSA.Verify(pk, M, s, ctx) defined in Algorithm 3 Section 5.3 of [FIPS.204]. Composite ML-DSA exposes an API similar to that of ML- DSA, despite the fact that it includes pre-hashing in a similar way to HashML-DSA. Internally it uses pure ML-DSA as the component algorithm since there is no advantage to pre-hashing twice. Compliant applications MUST output "Valid signature" (true) if and only if all component signatures were successfully validated, and "Invalid signature" (false) otherwise. The following describes how to instantiate a Verify() function for a given composite algorithm represented by . Composite-ML-DSA.Verify(pk, M, s, ctx) -> true or false Explicit inputs: pk Composite public key consisting of verification public keys for each component. M Message whose signature is to be verified, an octet string. s A composite signature value to be verified. ctx The application context string used in the composite signature combiner, which defaults to the empty string. Implicit inputs mapped from : ML-DSA The underlying ML-DSA algorithm and parameter set, for example, could be "ML-DSA-65". Trad The underlying traditional algorithm and parameter set, for example "RSASSA-PSS with id-sha256" or "Ed25519". Prefix The prefix String which is the byte encoding of the String "CompositeAlgorithmSignatures2025" which in hex is 436F6D706F73697465416C676F726974686D5369676E61747572657332303235 Domain Domain separator value for binding the signature to the Composite ML-DSA OID. Additionally, the composite Domain is passed into the underlying ML-DSA primitive as the ctx. Domain values are defined in the "Domain Separators" Ounsworth, et al. Expires 20 December 2025 [Page 14] Internet-Draft Composite ML-DSA June 2025 section below. PH The Message Digest Algorithm for pre-hashing. See section on pre-hashing the message below. Output: Validity (bool) "Valid signature" (true) if the composite signature is valid, "Invalid signature" (false) otherwise. Signature Verification Process: 1. If len(ctx) > 255 return error 2. Separate the keys and signatures (mldsaPK, tradPK) = DeserializePublicKey(pk) (r, mldsaSig, tradSig) = DeserializeSignatureValue(s) If Error during deserialization, or if any of the component keys or signature values are not of the correct type or length for the given component algorithm then output "Invalid signature" and stop. 3. Compute a Hash of the Message. As in FIPS 204, len(ctx) is encoded as a single unsigned byte. M' = Prefix || Domain || len(ctx) || ctx || r || PH( M ) 4. Check each component signature individually, according to its algorithm specification. If any fail, then the entire signature validation fails. if not ML-DSA.Verify( mldsaPK, M', mldsaSig, ctx=Domain ) then output "Invalid signature" if not Trad.Verify( tradPK, M', tradSig ) then output "Invalid signature" if all succeeded, then output "Valid signature" Figure 3: Composite-ML-DSA.Verify(pk, M, signature, ctx) Ounsworth, et al. Expires 20 December 2025 [Page 15] Internet-Draft Composite ML-DSA June 2025 Note that in step 4 above, the function fails early if the first component fails to verify. Since no private keys are involved in a signature verification, there are no timing attacks to consider, so this is ok. 5. Serialization This section presents routines for serializing and deserializing composite public keys, private keys, and signature values to bytes via simple concatenation of the underlying encodings of the component algorithms. The functions defined in this section are considered internal implementation detail and are referenced from within the public API definitions in Section 4. Deserialization is possible because ML-DSA has fixed-length public keys, private keys (seeds), and signature values as shown in the following table. +===========+============+=============+===========+ | Algorithm | Public key | Private key | Signature | +===========+============+=============+===========+ | ML-DSA-44 | 1312 | 32 | 2420 | +-----------+------------+-------------+-----------+ | ML-DSA-65 | 1952 | 32 | 3309 | +-----------+------------+-------------+-----------+ | ML-DSA-87 | 2592 | 32 | 4627 | +-----------+------------+-------------+-----------+ Table 1: ML-DSA Key and Signature Sizes in bytes For all serialization routines below, when these values are required to be carried in an ASN.1 structure, they are wrapped as described in Section 6.1. While ML-DSA has a single fixed-size representation for each of public key, private key (seed), and signature, the traditional component might allow multiple valid encodings; for example an elliptic curve public key might be validly encoded as either compressed or uncompressed [SEC1], or an RSA private key could be encoded in Chinese Remainder Theorem form [RFC8017]. In order to obtain interoperability, composite algorithms MUST use the following encodings of the underlying components: * *ML-DSA*: MUST be encoded as specified in [FIPS.204], using a 32-byte seed as the private key. Ounsworth, et al. Expires 20 December 2025 [Page 16] Internet-Draft Composite ML-DSA June 2025 * *RSA*: MUST be encoded with the (n,e) public key representation as specified in A.1.1 of [RFC8017] and the private key representation as specified in A.1.2 of [RFC8017]. * *ECDSA*: public key MUST be encoded as an ECPoint as specified in section 2.2 of [RFC5480], with both compressed and uncompressed keys supported. For maximum interoperability, it is RECOMMENEDED to use uncompressed points. * *EdDSA*: MUST be encoded as per section 3 of [RFC8032]. Even with fixed encodings for the traditional component, there may be slight differences in size of the encoded value due to, for example, encoding rules that drop leading zeroes. See Appendix A for further discussion of encoded size of each composite algorithm. The deserialization routines described below do not check for well- formedness of the cryptographic material they are recovering. It is assumed that underlying cryptographic primitives will catch malformed values and raise an appropriate error. 5.1. SerializePublicKey and DeserializePublicKey The serialization routine for keys simply concatenates the public keys of the component signature algorithms, as defined below: Ounsworth, et al. Expires 20 December 2025 [Page 17] Internet-Draft Composite ML-DSA June 2025 Composite-ML-DSA.SerializePublicKey(mldsaPK, tradPK) -> bytes Explicit inputs: mldsaPK The ML-DSA public key, which is bytes. tradPK The traditional public key in the appropriate encoding for the underlying component algorithm. Implicit inputs: None Output: bytes The encoded composite public key. Serialization Process: 1. Combine and output the encoded public key output mldsaPK || tradPK Figure 4: Composite-ML-DSA.SerializePublicKey(mldsaPK, tradPK) -> bytes Deserialization reverses this process. Each component key is deserialized according to their respective specification as shown in Appendix B. The following describes how to instantiate a DeserializePublicKey(bytes) function for a given composite algorithm represented by . Ounsworth, et al. Expires 20 December 2025 [Page 18] Internet-Draft Composite ML-DSA June 2025 Composite-ML-DSA.DeserializePublicKey(bytes) -> (mldsaPK, tradPK) Explicit inputs: bytes An encoded composite public key. Implicit inputs mapped from : ML-DSA The underlying ML-DSA algorithm and parameter set to use, for example, could be "ML-DSA-65". Output: mldsaPK The ML-DSA public key, which is bytes. tradPK The traditional public key in the appropriate encoding for the underlying component algorithm. Deserialization Process: 1. Parse each constituent encoded public key. The length of the mldsaKey is known based on the size of the ML-DSA component key length specified by the Object ID. switch ML-DSA do case ML-DSA-44: mldsaPK = bytes[:1312] tradPK = bytes[1312:] case ML-DSA-65: mldsaPK = bytes[:1952] tradPK = bytes[1952:] case ML-DSA-87: mldsaPK = bytes[:2592] tradPK = bytes[2592:] Note that while ML-DSA has fixed-length keys, RSA and ECDSA may not, depending on encoding, so rigorous length-checking of the overall composite key is not always possible. 2. Output the component public keys output (mldsaPK, tradPK) Figure 5: Composite-ML-DSA.DeserializePublicKey(bytes) -> (mldsaPK, tradPK) Ounsworth, et al. Expires 20 December 2025 [Page 19] Internet-Draft Composite ML-DSA June 2025 5.2. SerializePrivateKey and DeserializePrivateKey The serialization routine for keys simply concatenates the private keys of the component signature algorithms, as defined below: Composite-ML-DSA.SerializePrivateKey(mldsaSeed, tradSK) -> bytes Explicit inputs: mldsaSeed The ML-DSA private key, which is the bytes of the seed. tradSK The traditional private key in the appropriate encoding for the underlying component algorithm. Implicit inputs: None Output: bytes The encoded composite private key. Serialization Process: 1. Combine and output the encoded private key. output mldsaSeed || tradSK Figure 6: Composite-ML-DSA.SerializePrivateKey(mldsaSeed, tradSK) -> bytes Deserialization reverses this process. Each component key is deserialized according to their respective specification as shown in Appendix B. The following describes how to instantiate a DeserializePrivateKey(bytes) function. Since ML-DSA private keys are 32 bytes for all parameter sets, this function does not need to be parametrized. Ounsworth, et al. Expires 20 December 2025 [Page 20] Internet-Draft Composite ML-DSA June 2025 Composite-ML-DSA.DeserializePrivateKey(bytes) -> (mldsaSeed, tradSK) Explicit inputs: bytes An encoded composite private key. Implicit inputs: That an ML-DSA private key is 32 bytes for all parameter sets. Output: mldsaSeed The ML-DSA private key, which is the bytes of the seed. tradSK The traditional private key in the appropriate encoding for the underlying component algorithm. Deserialization Process: 1. Parse each constituent encoded key. The length of an ML-DSA private key is always a 32 byte seed for all parameter sets. mldsaSeed = bytes[:32] tradSK = bytes[32:] Note that while ML-DSA has fixed-length keys, RSA and ECDSA may not, depending on encoding, so rigorous length-checking of the overall composite key is not always possible. 2. Output the component private keys output (mldsaSeed, tradSK) Figure 7: Composite-ML-DSA.DeserializePrivateKey(bytes) -> (mldsaSeed, tradSK) 5.3. SerializeSignatureValue and DeserializeSignatureValue The serialization routine for the composite signature value simply concatenates the fixed-length ML-DSA signature value with the signature value from the traditional algorithm, as defined below: Ounsworth, et al. Expires 20 December 2025 [Page 21] Internet-Draft Composite ML-DSA June 2025 Composite-ML-DSA.SerializeSignatureValue(r, mldsaSig, tradSig) -> bytes Explicit inputs: r The 32 byte signature randomizer. mldsaSig The ML-DSA signature value, which is bytes. tradSig The traditional signature value in the appropriate encoding for the underlying component algorithm. Implicit inputs: None Output: bytes The encoded composite signature value. Serialization Process: 1. Combine and output the encoded composite signature output r || mldsaSig || tradSig Figure 8: Composite-ML-DSA.SerializeSignatureValue(r, mldsaSig, tradSig) -> bytes Deserialization reverses this process, raising an error in the event that the input is malformed. Each component signature is deserialized according to their respective specification as shown in Appendix B. The following describes how to instantiate a DeserializeSignatureValue(bytes) function for a given composite algorithm represented by . Composite-ML-DSA.DeserializeSignatureValue(bytes) -> (r, mldsaSig, tradSig) Explicit inputs: bytes An encoded composite signature value. Implicit inputs mapped from : ML-DSA The underlying ML-DSA algorithm and parameter set to use, for example, could be "ML-DSA-65". Ounsworth, et al. Expires 20 December 2025 [Page 22] Internet-Draft Composite ML-DSA June 2025 Output: r The 32 byte signature randomizer. mldsaSig The ML-DSA signature value, which is bytes. tradSig The traditional signature value in the appropriate encoding for the underlying component algorithm. Deserialization Process: 1. Parse the randomizer r. r = bytes[:32] sigs = bytes[32:] # truncate off the randomizer 2. Parse each constituent encoded signature. The length of the mldsaSig is known based on the size of the ML-DSA component signature length specified by the Object ID. switch ML-DSA do case ML-DSA-44: mldsaSig = sigs[:2420] tradSig = sigs[2420:] case ML-DSA-65: mldsaSig = sigs[:3309] tradSig = sigs[3309:] case ML-DSA-87: mldsaSig = sigs[:4627] tradSig = sigs[4627:] Note that while ML-DSA has fixed-length signatures, RSA and ECDSA may not, depending on encoding, so rigorous length-checking is not always possible here. 3. Output the component signature values output (r, mldsaSig, tradSig) Figure 9: Composite-ML-DSA.DeserializeSignatureValue(bytes) -> (r, mldsaSig, tradSig) 6. Use within X.509 and PKIX The following sections provide processing logic and the ASN.1 modules necessary to use composite ML-DSA within X.509 and PKIX protocols. Use within the Cryptographic Message Syntax (CMS) will be covered in a separate specification. Ounsworth, et al. Expires 20 December 2025 [Page 23] Internet-Draft Composite ML-DSA June 2025 While composite ML-DSA keys and signature values MAY be used raw, the following sections provide conventions for using them within X.509 and other PKIX protocols such that Composite ML-DSA can be used as a drop-in replacement for existing digital signature algorithms in PKCS#10 [RFC2986], CMP [RFC4210], X.509 [RFC5280], and related protocols. 6.1. Encoding to DER The serialization routines presented in Section 5 produce raw binary values. When these values are required to be carried within a DER- endeded message format such as an X.509's subjectPublicKey and signatureValue BIT STRING [RFC5280] or a CMS SignerInfo.signature OCTET STRING [RFC5652], then the composite value MUST be wrapped into a DER BIT STRING or OCTET STRING in the obvious ways. When a BIT STRING is required, the octets of the composite data value SHALL be used as the bits of the bit string, with the most significant bit of the first octet becoming the first bit, and so on, ending with the least significant bit of the last octet becoming the last bit of the bit string. When an OCTET STRING is required, the DER encoding of the composite data value SHALL be used directly. 6.2. Key Usage Bits When any Composite ML-DSA Object Identifier appears within the SubjectPublicKeyInfo.AlgorithmIdentifier field of an X.509 certificate [RFC5280], the key usage certificate extension MUST only contain signing-type key usages. The normal keyUsage rules for signing-type keys from [RFC5280] apply, and are reproduced here for completeness. For Certification Authority (CA) certificates that carry a Composite ML-DSA public key, any combination of the following values MAY be present and any other values MUST NOT be present: digitalSignature; nonRepudiation; keyCertSign; and cRLSign. For End Entity certificates, any combination of the following values MAY be present and any other values MUST NOT be present: Ounsworth, et al. Expires 20 December 2025 [Page 24] Internet-Draft Composite ML-DSA June 2025 digitalSignature; and nonRepudiation; Composite ML-DSA keys MUST NOT be used in a "dual usage" mode because even if the traditional component key supports both signing and encryption, the post-quantum algorithms do not and therefore the overall composite algorithm does not. Implementations MUST NOT use one component of the composite for the purposes of digital signature and the other component for the purposes of encryption or key establishment. 6.3. ASN.1 Definitions Composite ML-DSA uses a substantially non-ASN.1 based encoding, as specified in Section 5. However, as composite algorithms will be used within ASN.1-based X.509 and PKIX protocols, some conventions for ASN.1 wrapping are necessary. The following ASN.1 Information Object Classes are are defined to allow for compact definitions of each composite algorithm, leading to a smaller overall ASN.1 module. pk-CompositeSignature {OBJECT IDENTIFIER:id, PublicKeyType} PUBLIC-KEY ::= { IDENTIFIER id KEY BIT STRING PARAMS ARE absent CERT-KEY-USAGE { digitalSignature, nonRepudiation, keyCertSign, cRLSign} } sa-CompositeSignature{OBJECT IDENTIFIER:id, PUBLIC-KEY:publicKeyType } SIGNATURE-ALGORITHM ::= { IDENTIFIER id VALUE BIT STRING PARAMS ARE absent PUBLIC-KEYS {publicKeyType} } Figure 10: ASN.1 Object Information Classes for Composite ML-DSA As an example, the public key and signature algorithm types associated with id-MLDSA44-ECDSA-P256-SHA256 are defined as: Ounsworth, et al. Expires 20 December 2025 [Page 25] Internet-Draft Composite ML-DSA June 2025 pk-MLDSA44-ECDSA-P256-SHA256 PUBLIC-KEY ::= pk-CompositeSignature{ id-MLDSA44-ECDSA-P256-SHA256} sa-MLDSA44-ECDSA-P256-SHA256 SIGNATURE-ALGORITHM ::= sa-CompositeSignature{ id-MLDSA44-ECDSA-P256-SHA256, pk-MLDSA44-ECDSA-P256-SHA256 } The full set of key types defined by this specification can be found in the ASN.1 Module in Section 8. Use cases that require an interoperable encoding for composite private keys will often need to place a composite private key inside a OneAsymmetricKey structure defined in [RFC5958], such as when private keys are carried in PKCS #12 [RFC7292], CMP [RFC4210] or CRMF [RFC4211]. The definition of OneAsymmetricKey is copied here for convenience: OneAsymmetricKey ::= SEQUENCE { version Version, privateKeyAlgorithm PrivateKeyAlgorithmIdentifier, privateKey PrivateKey, attributes [0] Attributes OPTIONAL, ..., [[2: publicKey [1] PublicKey OPTIONAL ]], ... } ... PrivateKey ::= OCTET STRING -- Content varies based on type of key. The -- algorithm identifier dictates the format of -- the key. Figure 11: OneAsymmetricKey as defined in [RFC5958] When a composite private key is conveyed inside a OneAsymmetricKey structure (version 1 of which is also known as PrivateKeyInfo) [RFC5958], the privateKeyAlgorithm field SHALL be set to the corresponding composite algorithm identifier defined according to Section 7 and its parameters field MUST be absent. The privateKey field SHALL contain the OCTET STRING representation of the serialized composite private key as per Section 5.2. The publicKey field remains OPTIONAL. If the publicKey field is present, it MUST be a composite public key as per Section 5.1. Some applications might need to reconstruct the SubjectPublicKeyInfo or OneAsymmetricKey objects corresponding to each component key individually, for example if this is required for invoking the Ounsworth, et al. Expires 20 December 2025 [Page 26] Internet-Draft Composite ML-DSA June 2025 underlying primitive. Section 7 provides the necessary mapping between composite and their component algorithms for doing this reconstruction. Component keys of a composite MUST NOT be used in any other type of key or as a standalone key. For more details on the security considerations around key reuse, see section Section 10.3. 7. Algorithm Identifiers This table summarizes the OID and the component algorithms for each Composite ML-DSA algorithm. EDNOTE: these are prototyping OIDs to be replaced by IANA. is equal to 2.16.840.1.114027.80.9.1 +=============================+============+====+=======================+=============+ |Composite Signature Algorithm|OID |ML- |Trad |Pre-Hash | | | |DSA | | | +=============================+============+====+=======================+=============+ |id-MLDSA44-RSA2048-PSS-SHA256|.0 |ML-D|RSASSA-PSS with SHA256 |SHA256 | | | |SA-4| | | | | |4 | | | +-----------------------------+------------+----+-----------------------+-------------+ |id- |.1 |ML-D|sha256WithRSAEncryption|SHA256 | |MLDSA44-RSA2048-PKCS15-SHA256| |SA-4| | | | | |4 | | | +-----------------------------+------------+----+-----------------------+-------------+ |id-MLDSA44-Ed25519-SHA512 |.2 |ML-D|Ed25519 |SHA512 | | | |SA-4| | | | | |4 | | | +-----------------------------+------------+----+-----------------------+-------------+ |id-MLDSA44-ECDSA-P256-SHA256 |.3 |ML-D|ecdsa-with-SHA256 with |SHA256 | | | |SA-4|secp256r1 | | | | |4 | | | +-----------------------------+------------+----+-----------------------+-------------+ |id-MLDSA65-RSA3072-PSS-SHA512|.4 |ML-D|RSASSA-PSS with SHA256 |SHA512 | | | |SA-6| | | | | |5 | | | +-----------------------------+------------+----+-----------------------+-------------+ |id- |.5 |ML-D|sha256WithRSAEncryption|SHA512 | |MLDSA65-RSA3072-PKCS15-SHA512| |SA-6| | | | | |5 | | | +-----------------------------+------------+----+-----------------------+-------------+ |id-MLDSA65-RSA4096-PSS-SHA512|.6 |ML-D|RSASSA-PSS with SHA384 |SHA512 | | | |SA-6| | | | | |5 | | | Ounsworth, et al. Expires 20 December 2025 [Page 27] Internet-Draft Composite ML-DSA June 2025 +-----------------------------+------------+----+-----------------------+-------------+ |id- |.7 |ML-D|sha384WithRSAEncryption|SHA512 | |MLDSA65-RSA4096-PKCS15-SHA512| |SA-6| | | | | |5 | | | +-----------------------------+------------+----+-----------------------+-------------+ |id-MLDSA65-ECDSA-P256-SHA512 |.8 |ML-D|ecdsa-with-SHA256 with |SHA512 | | | |SA-6|secp256r1 | | | | |5 | | | +-----------------------------+------------+----+-----------------------+-------------+ |id-MLDSA65-ECDSA-P384-SHA512 |.9 |ML-D|ecdsa-with-SHA384 with |SHA512 | | | |SA-6|secp384r1 | | | | |5 | | | +-----------------------------+------------+----+-----------------------+-------------+ |id-MLDSA65-ECDSA- |.10|ML-D|ecdsa-with-SHA256 with |SHA512 | |brainpoolP256r1-SHA512 | |SA-6|brainpoolP256r1 | | | | |5 | | | +-----------------------------+------------+----+-----------------------+-------------+ |id-MLDSA65-Ed25519-SHA512 |.11|ML-D|Ed25519 |SHA512 | | | |SA-6| | | | | |5 | | | +-----------------------------+------------+----+-----------------------+-------------+ |id-MLDSA87-ECDSA-P384-SHA512 |.12|ML-D|ecdsa-with-SHA384 with |SHA512 | | | |SA-8|secp384r1 | | | | |7 | | | +-----------------------------+------------+----+-----------------------+-------------+ |id-MLDSA87-ECDSA- |.13|ML-D|ecdsa-with-SHA384 with |SHA512 | |brainpoolP384r1-SHA512 | |SA-8|brainpoolP384r1 | | | | |7 | | | +-----------------------------+------------+----+-----------------------+-------------+ |id-MLDSA87-Ed448-SHAKE256 |.14|ML-D|Ed448 |SHAKE256/512*| | | |SA-8| | | | | |7 | | | +-----------------------------+------------+----+-----------------------+-------------+ |id-MLDSA87-RSA3072-PSS-SHA512|.15|ML-D|RSASSA-PSS with SHA384 |SHA512 | | | |SA-8| | | | | |7 | | | +-----------------------------+------------+----+-----------------------+-------------+ |id-MLDSA87-RSA4096-PSS-SHA512|.16|ML-D|RSASSA-PSS with SHA384 |SHA512 | | | |SA-8| | | | | |7 | | | +-----------------------------+------------+----+-----------------------+-------------+ |id-MLDSA87-ECDSA-P521-SHA512 |.17|ML-D|ecdsa-with-SHA512 with |SHA512 | | | |SA-8|secp521r1 | | | | |7 | | | +-----------------------------+------------+----+-----------------------+-------------+ Table 2: ML-DSA Composite Signature Algorithms Ounsworth, et al. Expires 20 December 2025 [Page 28] Internet-Draft Composite ML-DSA June 2025 *Note: The pre-hash functions were chosen to roughly match the security level of the stronger component. In the case of Ed25519 and Ed448 they match the hash function defined in [RFC8032]; SHA512 for Ed25519ph and SHAKE256(x, 64), which is SHAKE256 producing 64 bytes (512 bits) of output, for Ed448ph. Full specifications for the referenced algorithms can be found in Appendix B. As the number of algorithms can be daunting to implementers, see Section 11.3 for a discussion of choosing a subset to support. 7.1. Domain Separator Values Each Composite ML-DSA algorithm has a unique domain separator value which is used in constructing the message representative M' in the Composite-ML-DSA.Sign() (Section 4.2) and Composite-ML-DSA.Verify() (Section 4.3). This helps protect against component signature values being removed from the composite and used out of context. The domain separator is simply the DER encoding of the OID. The following table shows the HEX-encoded domain separator value for each Composite ML-DSA algorithm. Ounsworth, et al. Expires 20 December 2025 [Page 29] Internet-Draft Composite ML-DSA June 2025 +=======================================+==========================+ |Composite Signature Algorithm |Domain Separator (in Hex | | |encoding) | +=======================================+==========================+ |id-MLDSA44-RSA2048-PSS-SHA256 |060B6086480186FA6B50090100| +---------------------------------------+--------------------------+ |id-MLDSA44-RSA2048-PKCS15-SHA256 |060B6086480186FA6B50090101| +---------------------------------------+--------------------------+ |id-MLDSA44-Ed25519-SHA512 |060B6086480186FA6B50090102| +---------------------------------------+--------------------------+ |id-MLDSA44-ECDSA-P256-SHA256 |060B6086480186FA6B50090103| +---------------------------------------+--------------------------+ |id-MLDSA65-RSA3072-PSS-SHA512 |060B6086480186FA6B50090105| +---------------------------------------+--------------------------+ |id-MLDSA65-RSA4096-PSS-SHA512 |060B6086480186FA6B50090106| +---------------------------------------+--------------------------+ |id-MLDSA65-RSA4096-PKCS15-SHA512 |060B6086480186FA6B50090107| +---------------------------------------+--------------------------+ |id-MLDSA65-ECDSA-P256-SHA512 |060B6086480186FA6B50090108| +---------------------------------------+--------------------------+ |id-MLDSA65-ECDSA-P384-SHA512 |060B6086480186FA6B50090109| +---------------------------------------+--------------------------+ |id-MLDSA65-ECDSA-brainpoolP256r1-SHA512|060B6086480186FA6B5009010A| +---------------------------------------+--------------------------+ |id-MLDSA65-Ed25519-SHA512 |060B6086480186FA6B5009010B| +---------------------------------------+--------------------------+ |id-MLDSA87-ECDSA-P384-SHA512 |060B6086480186FA6B5009010C| +---------------------------------------+--------------------------+ |id-MLDSA87-ECDSA-brainpoolP384r1-SHA512|060B6086480186FA6B5009010D| +---------------------------------------+--------------------------+ |id-MLDSA87-Ed448-SHAKE256 |060B6086480186FA6B5009010E| +---------------------------------------+--------------------------+ |id-MLDSA87-RSA3072-PSS-SHA512 |060B6086480186FA6B5009010F| +---------------------------------------+--------------------------+ |id-MLDSA87-RSA4096-PSS-SHA512 |060B6086480186FA6B50090110| +---------------------------------------+--------------------------+ |id-MLDSA87-ECDSA-P521-SHA512 |060B6086480186FA6B50090111| +---------------------------------------+--------------------------+ Table 3: ML-DSA Composite Signature Domain Separators EDNOTE: these domain separators are based on the prototyping OIDs assigned on the Entrust arc. We will need to ask for IANA early assignment of these OIDs so that we can re-compute the domain separators over the final OIDs. Ounsworth, et al. Expires 20 December 2025 [Page 30] Internet-Draft Composite ML-DSA June 2025 7.2. Rationale for choices In generating the list of composite algorithms, the idea was to provide composite algorithms at various security levels with varying performance characteristics. The main design consideration in choosing pairings is to prioritize providing pairings of each ML-DSA security level with commonly- deployed traditional algorithms. This supports the design goal of using composites as a stepping stone to efficiently deploy post- quantum on top of existing hardened and certified traditional algorithm implementations. This was prioritized rather than attempting to exactly match the security level of the post-quantum and traditional components -- which in general is difficult to do since there is no academic consensus on how to compare the "bits of security" against classical attackers and "qubits of security" against quantum attackers. SHA2 is prioritized over SHA3 in order to facilitate implementations that do not have easy access to SHA3 outside of the ML-DSA module. However SHAKE256 is used with Ed448 since this is already the recommended hash functions chosen for ED448ph in [RFC8032]. In some cases, multiple hash functions are used within the same composite algorithm. Consider for example id-MLDSA65-ECDSA- P256-SHA512 which requires SHA512 as the overall composite pre-hash in order to maintain the security level of ML-DSA-65, but uses SHA256 within the ecdsa-with-SHA256 with secp256r1 traditional component. While this increases the implementation burden of needing to carry multiple hash functions for a single composite algorithm, this aligns with the design goal of choosing commonly-implemented traditional algorithms since ecdsa-with-SHA256 with secp256r1 is far more common than, for example, ecdsa-with-SHA512 with secp256r1. 7.3. RSASSA-PSS Parameters Use of RSASSA-PSS [RFC8017] requires extra parameters to be specified. As with the other composite signature algorithms, when a composite algorithm OID involving RSA-PSS is used in an AlgorithmIdentifier, the parameters MUST be absent. When RSA-PSS is used at the 2048-bit security level, RSASSA-PSS SHALL be instantiated with the following parameters: Ounsworth, et al. Expires 20 December 2025 [Page 31] Internet-Draft Composite ML-DSA June 2025 +=============================+===========+ | RSASSA-PSS Parameter | Value | +=============================+===========+ | MaskGenAlgorithm.algorithm | id-mgf1 | +-----------------------------+-----------+ | maskGenAlgorithm.parameters | id-sha256 | +-----------------------------+-----------+ | Message Digest Algorithm | id-sha256 | +-----------------------------+-----------+ | Salt Length in bits | 256 | +-----------------------------+-----------+ Table 4: RSASSA-PSS 2048 Parameters When RSA-PSS is used at the 3072-bit or 4096-bit security level, RSASSA-PSS SHALL be instantiated with the following parameters: +=============================+===========+ | RSASSA-PSS Parameter | Value | +=============================+===========+ | MaskGenAlgorithm.algorithm | id-mgf1 | +-----------------------------+-----------+ | maskGenAlgorithm.parameters | id-sha512 | +-----------------------------+-----------+ | Message Digest Algorithm | id-sha512 | +-----------------------------+-----------+ | Salt Length in bits | 512 | +-----------------------------+-----------+ Table 5: RSASSA-PSS 3072 and 4096 Parameters Full specifications for the referenced algorithms can be found in Appendix B. 8. ASN.1 Module Composite-MLDSA-2025 { iso(1) identified-organization(3) dod(6) internet(1) security(5) mechanisms(5) pkix(7) id-mod(0) id-mod-composite-mldsa-2025(TBDMOD) } DEFINITIONS IMPLICIT TAGS ::= BEGIN EXPORTS ALL; Ounsworth, et al. Expires 20 December 2025 [Page 32] Internet-Draft Composite ML-DSA June 2025 IMPORTS PUBLIC-KEY, SIGNATURE-ALGORITHM, SMIME-CAPS, AlgorithmIdentifier{} FROM AlgorithmInformation-2009 -- RFC 5912 [X509ASN1] { iso(1) identified-organization(3) dod(6) internet(1) security(5) mechanisms(5) pkix(7) id-mod(0) id-mod-algorithmInformation-02(58) } ; -- -- Object Identifiers -- -- -- Information Object Classes -- pk-CompositeSignature {OBJECT IDENTIFIER:id} PUBLIC-KEY ::= { IDENTIFIER id KEY BIT STRING PARAMS ARE absent CERT-KEY-USAGE { digitalSignature, nonRepudiation, keyCertSign, cRLSign} } sa-CompositeSignature{OBJECT IDENTIFIER:id, PUBLIC-KEY:publicKeyType } SIGNATURE-ALGORITHM ::= { IDENTIFIER id VALUE OCTET STRING PARAMS ARE absent PUBLIC-KEYS {publicKeyType} } -- Composite ML-DSA which uses a PreHash Message -- TODO: OID to be replaced by IANA id-MLDSA44-RSA2048-PSS-SHA256 OBJECT IDENTIFIER ::= { joint-iso-itu-t(2) country(16) us(840) organization(1) entrust(114027) algorithm(80) composite-mldsa(9) signature(1) 0 } pk-MLDSA44-RSA2048-PSS-SHA256 PUBLIC-KEY ::= pk-CompositeSignature{ id-MLDSA44-RSA2048-PSS-SHA256} sa-MLDSA44-RSA2048-PSS-SHA256 SIGNATURE-ALGORITHM ::= sa-CompositeSignature{ id-MLDSA44-RSA2048-PSS-SHA256, Ounsworth, et al. Expires 20 December 2025 [Page 33] Internet-Draft Composite ML-DSA June 2025 pk-MLDSA44-RSA2048-PSS-SHA256 } -- TODO: OID to be replaced by IANA id-MLDSA44-RSA2048-PKCS15-SHA256 OBJECT IDENTIFIER ::= { joint-iso-itu-t(2) country(16) us(840) organization(1) entrust(114027) algorithm(80) composite-mldsa(9) signature(1) 1 } pk-MLDSA44-RSA2048-PKCS15-SHA256 PUBLIC-KEY ::= pk-CompositeSignature{ id-MLDSA44-RSA2048-PKCS15-SHA256} sa-MLDSA44-RSA2048-PKCS15-SHA256 SIGNATURE-ALGORITHM ::= sa-CompositeSignature{ id-MLDSA44-RSA2048-PKCS15-SHA256, pk-MLDSA44-RSA2048-PKCS15-SHA256 } -- TODO: OID to be replaced by IANA id-MLDSA44-Ed25519-SHA512 OBJECT IDENTIFIER ::= { joint-iso-itu-t(2) country(16) us(840) organization(1) entrust(114027) algorithm(80) composite-mldsa(9) signature(1) 2 } pk-MLDSA44-Ed25519-SHA512 PUBLIC-KEY ::= pk-CompositeSignature{ id-MLDSA44-Ed25519-SHA512} sa-MLDSA44-Ed25519-SHA512 SIGNATURE-ALGORITHM ::= sa-CompositeSignature{ id-MLDSA44-Ed25519-SHA512, pk-MLDSA44-Ed25519-SHA512 } -- TODO: OID to be replaced by IANA id-MLDSA44-ECDSA-P256-SHA256 OBJECT IDENTIFIER ::= { joint-iso-itu-t(2) country(16) us(840) organization(1) entrust(114027) algorithm(80) composite-mldsa(9) signature(1) 3 } pk-MLDSA44-ECDSA-P256-SHA256 PUBLIC-KEY ::= pk-CompositeSignature{ id-MLDSA44-ECDSA-P256-SHA256} sa-MLDSA44-ECDSA-P256-SHA256 SIGNATURE-ALGORITHM ::= sa-CompositeSignature{ id-MLDSA44-ECDSA-P256-SHA256, pk-MLDSA44-ECDSA-P256-SHA256 } -- TODO: OID to be replaced by IANA id-MLDSA65-RSA3072-PSS-SHA512 OBJECT IDENTIFIER ::= { joint-iso-itu-t(2) country(16) us(840) organization(1) entrust(114027) algorithm(80) composite-mldsa(9) signature(1) 4 } Ounsworth, et al. Expires 20 December 2025 [Page 34] Internet-Draft Composite ML-DSA June 2025 pk-MLDSA65-RSA3072-PSS-SHA512 PUBLIC-KEY ::= pk-CompositeSignature{ id-MLDSA65-RSA3072-PSS-SHA512} sa-MLDSA65-RSA3072-PSS-SHA512 SIGNATURE-ALGORITHM ::= sa-CompositeSignature{ id-MLDSA65-RSA3072-PSS-SHA512, pk-MLDSA65-RSA3072-PSS-SHA512 } -- TODO: OID to be replaced by IANA id-MLDSA65-RSA3072-PKCS15-SHA512 OBJECT IDENTIFIER ::= { joint-iso-itu-t(2) country(16) us(840) organization(1) entrust(114027) algorithm(80) composite-mldsa(9) signature(1) 5 } pk-MLDSA65-RSA3072-PKCS15-SHA512 PUBLIC-KEY ::= pk-CompositeSignature{ id-MLDSA65-RSA3072-PKCS15-SHA512} sa-MLDSA65-RSA3072-PKCS15-SHA512 SIGNATURE-ALGORITHM ::= sa-CompositeSignature{ id-MLDSA65-RSA3072-PKCS15-SHA512, pk-MLDSA65-RSA3072-PKCS15-SHA512 } -- TODO: OID to be replaced by IANA id-MLDSA65-RSA4096-PSS-SHA512 OBJECT IDENTIFIER ::= { joint-iso-itu-t(2) country(16) us(840) organization(1) entrust(114027) algorithm(80) composite-mldsa(9) signature(1) 6 } pk-MLDSA65-RSA4096-PSS-SHA512 PUBLIC-KEY ::= pk-CompositeSignature{ id-MLDSA65-RSA4096-PSS-SHA512} sa-MLDSA65-RSA4096-PSS-SHA512 SIGNATURE-ALGORITHM ::= sa-CompositeSignature{ id-MLDSA65-RSA4096-PSS-SHA512, pk-MLDSA65-RSA4096-PSS-SHA512 } -- TODO: OID to be replaced by IANA id-MLDSA65-RSA4096-PKCS15-SHA512 OBJECT IDENTIFIER ::= { joint-iso-itu-t(2) country(16) us(840) organization(1) entrust(114027) algorithm(80) composite-mldsa(9) signature(1) 7 } pk-MLDSA65-RSA4096-PKCS15-SHA512 PUBLIC-KEY ::= pk-CompositeSignature{ id-MLDSA65-RSA4096-PKCS15-SHA512} sa-MLDSA65-RSA4096-PKCS15-SHA512 SIGNATURE-ALGORITHM ::= sa-CompositeSignature{ id-MLDSA65-RSA4096-PKCS15-SHA512, pk-MLDSA65-RSA4096-PKCS15-SHA512 } Ounsworth, et al. Expires 20 December 2025 [Page 35] Internet-Draft Composite ML-DSA June 2025 -- TODO: OID to be replaced by IANA id-MLDSA65-ECDSA-P256-SHA512 OBJECT IDENTIFIER ::= { joint-iso-itu-t(2) country(16) us(840) organization(1) entrust(114027) algorithm(80) composite-mldsa(9) signature(1) 8 } pk-MLDSA65-ECDSA-P256-SHA512 PUBLIC-KEY ::= pk-CompositeSignature{ id-MLDSA65-ECDSA-P256-SHA512} sa-MLDSA65-ECDSA-P256-SHA512 SIGNATURE-ALGORITHM ::= sa-CompositeSignature{ id-MLDSA65-ECDSA-P256-SHA512, pk-MLDSA65-ECDSA-P256-SHA512 } -- TODO: OID to be replaced by IANA id-MLDSA65-ECDSA-P384-SHA512 OBJECT IDENTIFIER ::= { joint-iso-itu-t(2) country(16) us(840) organization(1) entrust(114027) algorithm(80) composite-mldsa(9) signature(1) 9 } pk-MLDSA65-ECDSA-P384-SHA512 PUBLIC-KEY ::= pk-CompositeSignature{ id-MLDSA65-ECDSA-P384-SHA512} sa-MLDSA65-ECDSA-P384-SHA512 SIGNATURE-ALGORITHM ::= sa-CompositeSignature{ id-MLDSA65-ECDSA-P384-SHA512, pk-MLDSA65-ECDSA-P384-SHA512 } -- TODO: OID to be replaced by IANA id-MLDSA65-ECDSA-brainpoolP256r1-SHA512 OBJECT IDENTIFIER ::= { joint-iso-itu-t(2) country(16) us(840) organization(1) entrust(114027) algorithm(80) composite-mldsa(9) signature(1) 10 } pk-MLDSA65-ECDSA-brainpoolP256r1-SHA512 PUBLIC-KEY ::= pk-CompositeSignature{ id-MLDSA65-ECDSA-brainpoolP256r1-SHA512} sa-MLDSA65-ECDSA-brainpoolP256r1-SHA512 SIGNATURE-ALGORITHM ::= sa-CompositeSignature{ id-MLDSA65-ECDSA-brainpoolP256r1-SHA512, pk-MLDSA65-ECDSA-brainpoolP256r1-SHA512 } -- TODO: OID to be replaced by IANA id-MLDSA65-Ed25519-SHA512 OBJECT IDENTIFIER ::= { joint-iso-itu-t(2) country(16) us(840) organization(1) entrust(114027) algorithm(80) composite-mldsa(9) signature(1) 11 } pk-MLDSA65-Ed25519-SHA512 PUBLIC-KEY ::= Ounsworth, et al. Expires 20 December 2025 [Page 36] Internet-Draft Composite ML-DSA June 2025 pk-CompositeSignature{ id-MLDSA65-Ed25519-SHA512} sa-MLDSA65-Ed25519-SHA512 SIGNATURE-ALGORITHM ::= sa-CompositeSignature{ id-MLDSA65-Ed25519-SHA512, pk-MLDSA65-Ed25519-SHA512 } -- TODO: OID to be replaced by IANA id-MLDSA87-ECDSA-P384-SHA512 OBJECT IDENTIFIER ::= { joint-iso-itu-t(2) country(16) us(840) organization(1) entrust(114027) algorithm(80) composite-mldsa(9) signature(1) 12 } pk-MLDSA87-ECDSA-P384-SHA512 PUBLIC-KEY ::= pk-CompositeSignature{ id-MLDSA87-ECDSA-P384-SHA512} sa-MLDSA87-ECDSA-P384-SHA512 SIGNATURE-ALGORITHM ::= sa-CompositeSignature{ id-MLDSA87-ECDSA-P384-SHA512, pk-MLDSA87-ECDSA-P384-SHA512 } -- TODO: OID to be replaced by IANA id-MLDSA87-ECDSA-brainpoolP384r1-SHA512 OBJECT IDENTIFIER ::= { joint-iso-itu-t(2) country(16) us(840) organization(1) entrust(114027) algorithm(80) composite-mldsa(9) signature(1) 13 } pk-MLDSA87-ECDSA-brainpoolP384r1-SHA512 PUBLIC-KEY ::= pk-CompositeSignature{ id-MLDSA87-ECDSA-brainpoolP384r1-SHA512} sa-MLDSA87-ECDSA-brainpoolP384r1-SHA512 SIGNATURE-ALGORITHM ::= sa-CompositeSignature{ id-MLDSA87-ECDSA-brainpoolP384r1-SHA512, pk-MLDSA87-ECDSA-brainpoolP384r1-SHA512 } -- TODO: OID to be replaced by IANA id-MLDSA87-Ed448-SHAKE256 OBJECT IDENTIFIER ::= { joint-iso-itu-t(2) country(16) us(840) organization(1) entrust(114027) algorithm(80) composite-mldsa(9) signature(1) 14 } pk-MLDSA87-Ed448-SHAKE256 PUBLIC-KEY ::= pk-CompositeSignature{ id-MLDSA87-Ed448-SHAKE256} sa-MLDSA87-Ed448-SHAKE256 SIGNATURE-ALGORITHM ::= sa-CompositeSignature{ id-MLDSA87-Ed448-SHAKE256, pk-MLDSA87-Ed448-SHAKE256 } Ounsworth, et al. Expires 20 December 2025 [Page 37] Internet-Draft Composite ML-DSA June 2025 -- TODO: OID to be replaced by IANA id-MLDSA87-RSA3072-PSS-SHA512 OBJECT IDENTIFIER ::= { joint-iso-itu-t(2) country(16) us(840) organization(1) entrust(114027) algorithm(80) composite-mldsa(9) signature(1) 15 } pk-MLDSA87-RSA3072-PSS-SHA512 PUBLIC-KEY ::= pk-CompositeSignature{ id-MLDSA87-RSA3072-PSS-SHA512} sa-MLDSA87-RSA3072-PSS-SHA512 SIGNATURE-ALGORITHM ::= sa-CompositeSignature{ id-MLDSA87-RSA3072-PSS-SHA512, pk-MLDSA87-RSA3072-PSS-SHA512 } -- TODO: OID to be replaced by IANA id-MLDSA87-RSA4096-PSS-SHA512 OBJECT IDENTIFIER ::= { joint-iso-itu-t(2) country(16) us(840) organization(1) entrust(114027) algorithm(80) composite-mldsa(9) signature(1) 16 } pk-MLDSA87-RSA4096-PSS-SHA512 PUBLIC-KEY ::= pk-CompositeSignature{ id-MLDSA87-RSA4096-PSS-SHA512} sa-MLDSA87-RSA4096-PSS-SHA512 SIGNATURE-ALGORITHM ::= sa-CompositeSignature{ id-MLDSA87-RSA4096-PSS-SHA512, pk-MLDSA87-RSA4096-PSS-SHA512 } -- TODO: OID to be replaced by IANA id-MLDSA87-ECDSA-P521-SHA512 OBJECT IDENTIFIER ::= { joint-iso-itu-t(2) country(16) us(840) organization(1) entrust(114027) algorithm(80) composite-mldsa(9) signature(1) 17 } pk-MLDSA87-ECDSA-P521-SHA512 PUBLIC-KEY ::= pk-CompositeSignature{ id-MLDSA87-ECDSA-P521-SHA512} sa-MLDSA87-ECDSA-P521-SHA512 SIGNATURE-ALGORITHM ::= sa-CompositeSignature{ id-MLDSA87-ECDSA-P521-SHA512, pk-MLDSA87-ECDSA-P521-SHA512 } SignatureAlgorithmSet SIGNATURE-ALGORITHM ::= { sa-MLDSA44-RSA2048-PSS-SHA256 | sa-MLDSA44-RSA2048-PKCS15-SHA256 | sa-MLDSA44-Ed25519-SHA512 | sa-MLDSA44-ECDSA-P256-SHA256 | sa-MLDSA65-RSA3072-PSS-SHA512 | Ounsworth, et al. Expires 20 December 2025 [Page 38] Internet-Draft Composite ML-DSA June 2025 sa-MLDSA65-RSA3072-PKCS15-SHA512 | sa-MLDSA65-RSA4096-PSS-SHA512 | sa-MLDSA65-RSA4096-PKCS15-SHA512 | sa-MLDSA65-ECDSA-P256-SHA512 | sa-MLDSA65-ECDSA-P384-SHA512 | sa-MLDSA65-ECDSA-brainpoolP256r1-SHA512 | sa-MLDSA65-Ed25519-SHA512 | sa-MLDSA87-ECDSA-P384-SHA512 | sa-MLDSA87-ECDSA-brainpoolP384r1-SHA512 | sa-MLDSA87-Ed448-SHAKE256 | sa-MLDSA87-RSA3072-PSS-SHA512 | sa-MLDSA87-RSA4096-PSS-SHA512 | sa-MLDSA87-ECDSA-P521-SHA512, ... } END 9. IANA Considerations IANA is requested to allocate a value from the "SMI Security for PKIX Module Identifier" registry [RFC7299] for the included ASN.1 module, and allocate values from "SMI Security for PKIX Algorithms" to identify the eighteen algorithms defined within. 9.1. Object Identifier Allocations EDNOTE to IANA: OIDs will need to be replaced in both the ASN.1 module and in Table 2. 9.1.1. Module Registration The following is to be registered in "SMI Security for PKIX Module Identifier": * Decimal: IANA Assigned - *Replace TBDMOD* * Description: Composite-Signatures-2025 - id-mod-composite- signatures * References: This Document 9.1.2. Object Identifier Registrations The following are to be registered in "SMI Security for PKIX Algorithms": Ounsworth, et al. Expires 20 December 2025 [Page 39] Internet-Draft Composite ML-DSA June 2025 * id-MLDSA44-RSA2048-PSS-SHA256 - Decimal: IANA Assigned - Description: id-MLDSA44-RSA2048-PSS-SHA256 - References: This Document * id-MLDSA44-RSA2048-PKCS15-SHA256 - Decimal: IANA Assigned - Description: id-MLDSA44-RSA2048-PKCS15-SHA256 - References: This Document * id-MLDSA44-Ed25519-SHA512 - Decimal: IANA Assigned - Description: id-MLDSA44-Ed25519-SHA512 - References: This Document * id-MLDSA44-ECDSA-P256-SHA256 - Decimal: IANA Assigned - Description: id-MLDSA44-ECDSA-P256-SHA256 - References: This Document * id-MLDSA65-RSA3072-PSS-SHA512 - Decimal: IANA Assigned - Description: id-MLDSA65-RSA3072-PSS-SHA512 - References: This Document * id-MLDSA65-RSA3072-PKCS15-SHA512 - Decimal: IANA Assigned - Description: id-MLDSA65-RSA3072-PKCS15-SHA512 - References: This Document Ounsworth, et al. Expires 20 December 2025 [Page 40] Internet-Draft Composite ML-DSA June 2025 * id-MLDSA65-RSA4096-PSS-SHA512 - Decimal: IANA Assigned - Description: id-MLDSA65-RSA4096-PSS-SHA512 - References: This Document * id-MLDSA65-RSA4096-PKCS15-SHA512 - Decimal: IANA Assigned - Description: id-MLDSA65-RSA4096-PKCS15-SHA512 - References: This Document * id-MLDSA65-ECDSA-P256-SHA512 - Decimal: IANA Assigned - Description: id-MLDSA65-ECDSA-P256-SHA512 - References: This Document * id-MLDSA65-ECDSA-P384-SHA512 - Decimal: IANA Assigned - Description: id-MLDSA65-ECDSA-P384-SHA512 - References: This Document * id-MLDSA65-ECDSA-brainpoolP256r1-SHA512 - Decimal: IANA Assigned - Description: id-MLDSA65-ECDSA-brainpoolP256r1-SHA512 - References: This Document * id-MLDSA65-Ed25519-SHA512 - Decimal: IANA Assigned - Description: id-MLDSA65-Ed25519-SHA512 - References: This Document Ounsworth, et al. Expires 20 December 2025 [Page 41] Internet-Draft Composite ML-DSA June 2025 * id-MLDSA87-ECDSA-P384-SHA512 - Decimal: IANA Assigned - Description: id-MLDSA87-ECDSA-P384-SHA512 - References: This Document * id-MLDSA87-ECDSA-brainpoolP384r1-SHA512 - Decimal: IANA Assigned - Description: id-MLDSA87-ECDSA-brainpoolP384r1-SHA512 - References: This Document * id-MLDSA87-Ed448-SHAKE256 - Decimal: IANA Assigned - Description: id-MLDSA87-Ed448-SHAKE256 - References: This Document * id-MLDSA87-RSA3072-PSS-SHA512 - Decimal: IANA Assigned - Description: id-MLDSA87-RSA3072-PSS-SHA512 - References: This Document * id-MLDSA87-RSA4096-PSS-SHA512 - Decimal: IANA Assigned - Description: id-MLDSA87-RSA4096-PSS-SHA512 - References: This Document * id-MLDSA87-ECDSA-P521-SHA512 - Decimal: IANA Assigned - Description: id-MLDSA87-ECDSA-P521-SHA512 - References: This Document Ounsworth, et al. Expires 20 December 2025 [Page 42] Internet-Draft Composite ML-DSA June 2025 10. Security Considerations 10.1. Why Hybrids? In broad terms, a PQ/T Hybrid can be used either to provide dual- algorithm security or to provide migration flexibility. Let's quickly explore both. Dual-algorithm security. The general idea is that the data is protected by two algorithms such that an attacker would need to break both in order to compromise the data. As with most of cryptography, this property is easy to state in general terms, but becomes more complicated when expressed in formalisms. Section 10.2 goes into more detail here. One common counter-argument against PQ/T hybrid signatures is that if an attacker can forge one of the component algorithms, then why attack the hybrid-signed message at all when they could simply forge a completely new message? The answer to this question must be found outside the cryptographic primitives themselves, and instead in policy; once an algorithm is known to be broken it ought to be disallowed for single-algorithm use by cryptographic policy, while hybrids involving that algorithm may continue to be used and to provide value. Migration flexibility. Some PQ/T hybrids exist to provide a sort of "OR" mode where the application can choose to use one algorithm or the other or both. The intention is that the PQ/T hybrid mechanism builds in backwards compatibility to allow legacy and upgraded applications to co-exist and communicate. The composites presented in this specification do not provide this since they operate in a strict "AND" mode. They do, however, provide codebase migration flexibility. Consider that an organization has today a mature, validated, certified, hardened implementation of RSA or ECC; composites allow them to add an ML-DSA implementation which immediately starts providing benefits against long-term document integrity attacks even if that ML-DSA implementation is still an experimental, non-validated, non-certified, non-hardened implementation. More details of obtaining FIPS certification of a composite algorithm can be found in Section 11.1. 10.2. Non-separability, EUF-CMA and SUF The signature combiner defined in this specification is Weakly Non- Separable (WNS), as defined in [I-D.ietf-pquip-hybrid-signature-spectrums], since the forged message M’ will include the composite domain separator as evidence. The prohibition on key reuse between composite and single-algorithm contexts discussed in Section 10.3 further strengthens the non- separability in practice, but does not achieve Strong Non- Ounsworth, et al. Expires 20 December 2025 [Page 43] Internet-Draft Composite ML-DSA June 2025 Separability (SNS) since policy mechanisms such as this are outside the definition of SNS. Unforgeability properties are somewhat more nuanced. We recall first the definitions of Existential Unforgeability under Chosen Message Attack (EUF-CMA) and Strong Unforgeability (SUF). The classic EUF- CMA game is in reference to a pair of algorithms ( Sign(), Verify() ) where the attacker has access to a signing oracle using the Sign() and must produce a message-signature pair (m', s') that is accepted by the verifier using Verify() and where m' was never signed by the oracle. SUF is similar but requires only that (m', s') != (m, s) for any honestly-generated (m, s), i.e. that the attacker cannot construct a new signature to an already-signed message. The pair ( CompositeML-DSA.Sign(), CompositeML-DSA.Verify() ) is EUF- CMA secure so long as at least one component algorithm is EUF-CMA secure since any attempt to modify the message would cause the EUF- CMA secure component to fail its Verify() which in turn will cause CompositeML-DSA.Verify() to fail. Composite ML-DSA only achieves SUF security if both components are SUF secure, which is not a useful property; the argument is that if the first component algorithm is not SUF secure then by definition it admits at least one (m, s1') pair where s1' was not produced by the honest signer, and the attacker can then combine it with an honestly- signed (m, s2) signature produced by the second algorithm over the same message m to create (m, (s1', s2)) which violates SUF for the composite algorithm. Of the traditional signature component algorithms used in this specification, only Ed25519 and Ed448 are SUF secure and therefore applications that require SUF security to be maintained even in the event that ML-DSA is broken SHOULD use it in composite with Ed25519 or Ed448. In addition to the classic EUF-CMA game, we also consider a “cross- protocol” version of the EUF-CMA game that is relevant to hybrids. Specifically, we want to consider a modified version of the EUF-CMA game where the attacker has access to either a signing oracle over the two component algorithms in isolation, Trad.Sign() and ML- DSA.Sign(), and attempts to fraudulently present them as a composite, or where the attacker has access to a composite signing oracle and then attempts to split the signature back into components and present them to either ML-DSA.Verify() or Trad.Verify(). In the case of Composite ML-DSA, a specific message forgery exists for a cross-protocol EUF-CMA attack, namely introduced by the prefix construction used to construct the to-be-signed message representative M'. This applies to use of individual component signing oracles with fraudulent presentation of the signature to a Ounsworth, et al. Expires 20 December 2025 [Page 44] Internet-Draft Composite ML-DSA June 2025 composite verification oracle, and use of a composite signing oracle with fraudulent splitting of the signature for presentation to component verification oracle(s) of either ML-DSA.Verify() or Trad.Verify(). In the first case, an attacker with access to signing oracles for the two component algorithms can sign M’ and then trivially assemble a composite. In the second case, the message M’ (containing the composite domain separator) can be presented as having been signed by a standalone component algorithm. However, use of the context string for domain separation enables Weak Non- Separability and auditable checks on hybrid use, which is deemed a reasonable trade-off. Moreover and very importantly, the cross- protocol EUF-CMA attack in either direction is foiled if implementers strictly follow the prohibition on key reuse presented in Section 10.3 since there cannot exist simultaneously composite and non-composite signers and verifiers for the same keys. 10.2.1. Implications of multiple encodings As noted in Section 5, this specification leaves some flexibility the choice of encoding of the traditional component. As such it is possible for the same composite public key to carry multiple valid representations (mldsaPK, tradPK1) and (mldsaPK, tradPK2) where tradPK1 and tradPK2 are alternate encodings of the same key, for example compressed vs uncompressed EC points. In theory alternate encodings of the traditional signature value are also possible, although the authors are not aware of any. In theory this introduces complications for EUF-CMA and SUF-CMA security proofs. Implementers who are concerned with this SHOULD choose implementations of the traditional component that only accept a single encoding and performs appropriate length-checking, and reject composites which contain any other encodings. This would reduce interoperability with other Composite ML-DSA implementations, but it is permitted by this specification. 10.3. Key Reuse While conformance with this specification requires that both components of a composite key MUST be freshly generated, the designers are aware that some implementers may be forced to break this rule due to operational constraints. This section documents the implications of doing so. Ounsworth, et al. Expires 20 December 2025 [Page 45] Internet-Draft Composite ML-DSA June 2025 When using single-algorithm cryptography, the best practice is to always generate fresh key material for each purpose, for example when renewing a certificate, or obtaining both a TLS and S/MIME certificate for the same device. However, in practice key reuse in such scenarios is not always catastrophic to security and therefore often tolerated. However this reasoning does not hold in the PQ/T hybrid setting. Within the broader context of PQ/T hybrids, we need to consider new attack surfaces that arise due to the hybrid constructions that did not exist in single-algorithm contexts. One of these is key reuse where the component keys within a hybrid are also used by themselves within a single-algorithm context. For example, it might be tempting for an operator to take an already-deployed RSA key pair and combine it with an ML-DSA key pair to form a hybrid key pair for use in a hybrid algorithm. Within a hybrid signature context this leads to a class of attacks referred to as "stripping attacks" discussed in Section 10.2 and may also open up risks from further cross-protocol attacks. Despite the weak non-separability property offered by the composite signature combiner, key reuse MUST be avoided to prevent the introduction of EUF-CMA vulnerabilities. In addition, there is a further implication to key reuse regarding certificate revocation. Upon receiving a new certificate enrolment request, many certification authorities will check if the requested public key has been previously revoked due to key compromise. Often a CA will perform this check by using the public key hash. Therefore, if one, or even both, components of a composite have been previously revoked, the CA may only check the hash of the combined composite key and not find the revocations. Therefore, because the possibility of key reuse exists even though forbidden in this specification, CAs performing revocation checks on a composite key SHOULD also check both component keys independently to verify that the component keys have not been revoked. Some application might disregard the requirements of this specification to not reuse key material between single-algorithm and composite contexts. While doing so is still a violation of this specification, the weakening of security from doing so can be mitigated by using an appropriate ctx value, such as ctx=Foobar-dual- cert-sig to indicate that this signature belongs to the Foobar protocol where two certificates were used to create a single composite signature. This specification does not endorse such uses, and per-application security analysis is needed. Ounsworth, et al. Expires 20 December 2025 [Page 46] Internet-Draft Composite ML-DSA June 2025 10.4. Use of Prefix for attack mitigation The Prefix value specified in Section 3.2 allows for cautious implementers to wrap their existing Traditional Verify() implementations with a guard that looks for messages starting with this string and fail with an error -- i.e. this can act as an extra protection against taking a composite signature and splitting it back into components. However, an implementation that does this will be unable to perform a Traditional signature and verification on a message which happens to start with this string. The designers accepted this trade-off. 10.5. Implications of signature randomizer The primary design motivation behind pre-hashing is to perform only a single pass over the potentially large input message M and to allow for optimizations in cases such as signing the same message digest with multiple different keys. Composite ML-DSA introduces a 32-byte randomizer into the signature representative M'. This is to prevent a class of attacks unique to composites, which we define as a "mixed-key forgery attack": Take two composite keys (mldsaPK1, tradPK1) and (mldsaPK2, tradPK2) which do not share any key material and have them produce signatures (r1, mldsaSig1, tradSig1) and (r2, mldsaSig2, tradSig2) respectively over the same message M. Consider whether it is possible to construct a forgery by swapping components and presenting (r, mldsaSig1, tradSig2) that verifies under a forged public key (mldsaPK1, tradPK2). This forgery attack is blocked by the randomizer r so long as r1 != r2. A failure of randomness, for example r = 0, or a fixed value of 'r' effectively reduces r to a prefix that doesn't add value, but it is no worse than the security properties that Composite ML-DSA would have had without the randomizer. Introduction of the randomizer might introduce other beneficial security properties, but these are outside the scope of design consideration. 10.6. Policy for Deprecated and Acceptable Algorithms Traditionally, a public key or certificate contains a single cryptographic algorithm. If and when an algorithm becomes deprecated (for example, RSA-512, or SHA1), the path to deprecating it through policy and removing it from operational environments is, at least is principle, straightforward. Ounsworth, et al. Expires 20 December 2025 [Page 47] Internet-Draft Composite ML-DSA June 2025 In the composite model this is less obvious since a PQ/T hybrid is expected to still be considered valid after the traditional component is deprecated for individual use. As such, a single composite public key or certificate may contain a mixture of deprecated and non- deprecated algorithms. In general this should be manageable through policy by removing OIDs for the standalone component algorithms while still allowing OIDs for composite algorithms. However, complications may arise when the composite implementation needs to invoke the cryptographic module for a deprecated component algorithm. In particular, this could lead to complex Cryptographic Bills of Materials that show implementations of deprecated algorithms still present and being used. 11. Implementation Considerations 11.1. FIPS certification The following sections give guidance to implementers wishing to FIPS- certify a composite implementation. This guidance is not authoritative and has not been endorsed by NIST. One of the primary design goals of this specification is for the overall composite algorithm to be able to be considered FIPS-approved even when one of the component algorithms is not. Implementers seeking FIPS certification of a composite signature algorithm where only one of the component algorithms has been FIPS- validated or FIPS-approved should credit the FIPS-validated component algorithm with full security strength, the non-FIPS-validated component algorithm with zero security, and the overall composite should be considered at least as strong and thus FIPS-approved. The composite algorithm has been designed to treat the underlying primitives as "black-box implementations" and not impose any additional requirements on them that could require an existing implementation of an underlying primitive to run in a mode different from the one under which it was certified. For example, the KeyGen defined in Section 4.1 invokes ML-DSA.KeyGen(seed) which might not be available in a cryptographic module running in FIPS-mode, but Section 4.1 is only a suggested implementation and the composite KeyGen MAY be implemented using a different available interface for ML-DSA.KeyGen. Another example is pre-hashing; a pre-hash is inherent to RSA, ECDSA, and ML-DSA (mu), and composite makes no assumptions or requirements about whether component-specific pre- hashing is done locally as part of the composite, or remotely as part of the component primitive. Ounsworth, et al. Expires 20 December 2025 [Page 48] Internet-Draft Composite ML-DSA June 2025 The signature randomizer r requires the composite implementation to have access to a cryptographic random number generator. However, as noted in Section 10.5, this provides additional security properties on top of those provided by ML-DSA, RSA, ECDSA, and EdDSA, and failure of randomness does not compromise the Composite ML-DSA algorithm or the underlying primitives. Therefore it should be possible to exclude this RNG invocation from the FIPS boundary if an implementation is not able to guarantee use of a FIPS-approved RNG. The authors wish to note that composite algorithms provide a design pattern to provide utility in future situations that require care to remain FIPS-compliant, such as future cryptographic migrations as well as bridging across jurisdictions with non-intersecting cryptographic requirements. 11.2. Backwards Compatibility The term "backwards compatibility" is used here to mean that existing systems as they are deployed today can interoperate with the upgraded systems of the future. This draft explicitly does not provide backwards compatibility, only upgraded systems will understand the OIDs defined in this specification. If backwards compatibility is required, then additional mechanisms will be needed. Migration and interoperability concerns need to be thought about in the context of various types of protocols that make use of X.509 and PKIX with relation to digital signature objects, from online negotiated protocols such as TLS 1.3 [RFC8446] and IKEv2 [RFC7296], to non-negotiated asynchronous protocols such as S/MIME signed email [RFC8551], document signing such as in the context of the European eIDAS regulations [eIDAS2014], and publicly trusted code signing [codesigningbrsv3.8], as well as myriad other standardized and proprietary protocols and applications that leverage CMS [RFC5652] signed structures. Composite simplifies the protocol design work because it can be implemented as a signature algorithm that fits into existing systems. 11.3. Profiling down the number of options One daunting aspect of this specification is the number of composite algorithm combinations. Each option has been specified because there is a community that has a direct application for it; typically because the traditional component is already deployed in a change- managed environment, or because that specific traditional component is required for regulatory reasons. Ounsworth, et al. Expires 20 December 2025 [Page 49] Internet-Draft Composite ML-DSA June 2025 However, this large number of combinations leads either to fracturing of the ecosystem into non-interoperable sub-groups when different communities choose non-overlapping subsets to support, or on the other hand it leads to spreading development resources too thin when trying to support all options. This specification does not list any particular composite algorithm as mandatory-to-implement, however organizations that operate within specific application domains are encouraged to define profiles that select a small number of composites appropriate for that application domain. For applications that do not have any regulatory requirements or legacy implementations to consider, it is RECOMMENDED to focus implementation effort on: id-MLDSA65-ECDSA-P256-SHA512 In applications that require RSA, it is RECOMMENDED to focus implementation effort on: id-MLDSA65-RSA3072-PSS-SHA512 In applications that only allow NIST PQC Level 5, it is RECOMMENDED to focus implementation effort on: id-MLDSA87-ECDSA-P384-SHA512 11.4. External Pre-hashing Implementers MAY externalize the pre-hash computation outside the module that computes Composite-ML-DSA.Sign() in an analogous way to how pre-hash signing is used for RSA, ECDSA or HashML-DSA. Such a modification to the Composite-ML-DSA.Sign() algorithm is considered compliant to this specification so long as it produces the same output and error conditions. Below is a suggested implementation for splitting the pre-hashing and signing between two parties. Ounsworth, et al. Expires 20 December 2025 [Page 50] Internet-Draft Composite ML-DSA June 2025 Composite-ML-DSA.Prehash(M) -> ph Explicit inputs: M The message to be signed, an octet string. Implicit inputs mapped from : PH The hash function to use for pre-hashing. Output: ph The pre-hash which equals PH ( M ) Process: 1. Compute the Prehash of the message using the Hash function defined by PH ph = PH ( M ) 2. Output ph Figure 12: Generation of the external pre-hash Ounsworth, et al. Expires 20 December 2025 [Page 51] Internet-Draft Composite ML-DSA June 2025 Composite-ML-DSA.Sign_ph(sk, ph, ctx) -> s Explicit inputs: sk Composite private key consisting of signing private keys for each component. ph The pre-hash digest over the message ctx The Message context string used in the composite signature combiner, which defaults to the empty string. Implicit inputs mapped from : ML-DSA The underlying ML-DSA algorithm and parameter set, for example, could be "ML-DSA-65". Trad The underlying traditional algorithm and parameter set, for example "RSASSA-PSS with id-sha256" or "Ed25519". Prefix The prefix String which is the byte encoding of the String "CompositeAlgorithmSignatures2025" which in hex is 436F6D706F73697465416C676F726974686D5369676E61747572657332303235 Domain Domain separator value for binding the signature to the Composite OID. Additionally, the composite Domain is passed into the underlying ML-DSA primitive as the ctx. Domain values are defined in the "Domain Separators" section below. Process: 1. Identical to Composite-ML-DSA.Sign (sk, M, ctx) but replace the internally generated PH( M ) from step 2 of Composite-ML-DSA.Sign (sk, M, ctx) with ph which is input into this function. Figure 13: Suggested implementation of external pre-hashing 12. References 12.1. Normative References [FIPS.186-5] National Institute of Standards and Technology (NIST), "Digital Signature Standard (DSS)", February 2023, . Ounsworth, et al. Expires 20 December 2025 [Page 52] Internet-Draft Composite ML-DSA June 2025 [FIPS.202] National Institute of Standards and Technology (NIST), "SHA-3 Standard: Permutation-Based Hash and Extendable- Output Functions", August 2015, . [FIPS.204] National Institute of Standards and Technology (NIST), "Module-Lattice-Based Digital Signature Standard", FIPS PUB 204, August 2024, . [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/RFC2119, March 1997, . [RFC2986] Nystrom, M. and B. Kaliski, "PKCS #10: Certification Request Syntax Specification Version 1.7", RFC 2986, DOI 10.17487/RFC2986, November 2000, . [RFC4210] Adams, C., Farrell, S., Kause, T., and T. Mononen, "Internet X.509 Public Key Infrastructure Certificate Management Protocol (CMP)", RFC 4210, DOI 10.17487/RFC4210, September 2005, . [RFC4211] Schaad, J., "Internet X.509 Public Key Infrastructure Certificate Request Message Format (CRMF)", RFC 4211, DOI 10.17487/RFC4211, September 2005, . [RFC5280] Cooper, D., Santesson, S., Farrell, S., Boeyen, S., Housley, R., and W. Polk, "Internet X.509 Public Key Infrastructure Certificate and Certificate Revocation List (CRL) Profile", RFC 5280, DOI 10.17487/RFC5280, May 2008, . [RFC5480] Turner, S., Brown, D., Yiu, K., Housley, R., and T. Polk, "Elliptic Curve Cryptography Subject Public Key Information", RFC 5480, DOI 10.17487/RFC5480, March 2009, . [RFC5639] Lochter, M. and J. Merkle, "Elliptic Curve Cryptography (ECC) Brainpool Standard Curves and Curve Generation", RFC 5639, DOI 10.17487/RFC5639, March 2010, . Ounsworth, et al. Expires 20 December 2025 [Page 53] Internet-Draft Composite ML-DSA June 2025 [RFC5652] Housley, R., "Cryptographic Message Syntax (CMS)", STD 70, RFC 5652, DOI 10.17487/RFC5652, September 2009, . [RFC5758] Dang, Q., Santesson, S., Moriarty, K., Brown, D., and T. Polk, "Internet X.509 Public Key Infrastructure: Additional Algorithms and Identifiers for DSA and ECDSA", RFC 5758, DOI 10.17487/RFC5758, January 2010, . [RFC5958] Turner, S., "Asymmetric Key Packages", RFC 5958, DOI 10.17487/RFC5958, August 2010, . [RFC6090] McGrew, D., Igoe, K., and M. Salter, "Fundamental Elliptic Curve Cryptography Algorithms", RFC 6090, DOI 10.17487/RFC6090, February 2011, . [RFC6234] Eastlake 3rd, D. and T. Hansen, "US Secure Hash Algorithms (SHA and SHA-based HMAC and HKDF)", RFC 6234, DOI 10.17487/RFC6234, May 2011, . [RFC8032] Josefsson, S. and I. Liusvaara, "Edwards-Curve Digital Signature Algorithm (EdDSA)", RFC 8032, DOI 10.17487/RFC8032, January 2017, . [RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC 2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174, May 2017, . [RFC8410] Josefsson, S. and J. Schaad, "Algorithm Identifiers for Ed25519, Ed448, X25519, and X448 for Use in the Internet X.509 Public Key Infrastructure", RFC 8410, DOI 10.17487/RFC8410, August 2018, . [SEC1] Certicom Research, "SEC 1: Elliptic Curve Cryptography", May 2009, . [SEC2] Certicom Research, "SEC 2: Recommended Elliptic Curve Domain Parameters", January 2010, . Ounsworth, et al. Expires 20 December 2025 [Page 54] Internet-Draft Composite ML-DSA June 2025 [X.690] ITU-T, "Information technology - ASN.1 encoding Rules: Specification of Basic Encoding Rules (BER), Canonical Encoding Rules (CER) and Distinguished Encoding Rules (DER)", ISO/IEC 8825-1:2015, November 2015. [X9.62_2005] American National Standards Institute, "Public Key Cryptography for the Financial Services Industry The Elliptic Curve Digital Signature Algorithm (ECDSA)", November 2005. 12.2. Informative References [ANSSI2024] French Cybersecurity Agency (ANSSI), Federal Office for Information Security (BSI), Netherlands National Communications Security Agency (NLNCSA), and Swedish National Communications Security Authority, Swedish Armed Forces, "Position Paper on Quantum Key Distribution", n.d., . [Bindel2017] Bindel, N., Herath, U., McKague, M., and D. Stebila, "Transitioning to a quantum-resistant public key infrastructure", 2017, . [BonehShoup] Boneh, D. and V. Shoup, "A Graduate Course in Applied Cryptography v0.6", January 2023, . [BSI2021] Federal Office for Information Security (BSI), "Quantum- safe cryptography - fundamentals, current developments and recommendations", October 2021, . [codesigningbrsv3.8] CA/Browser Forum, "Baseline Requirements for the Issuance and Management of Publicly‐Trusted Code Signing Certificates Version 3.8.0", n.d., . Ounsworth, et al. Expires 20 December 2025 [Page 55] Internet-Draft Composite ML-DSA June 2025 [eIDAS2014] European Parliament and Council, "Regulation (EU) No 910/2014 of the European Parliament and of the Council of 23 July 2014 on electronic identification and trust services for electronic transactions in the internal market and repealing Directive 1999/93/EC", n.d., . [I-D.ietf-lamps-dilithium-certificates] Massimo, J., Kampanakis, P., Turner, S., and B. Westerbaan, "Internet X.509 Public Key Infrastructure - Algorithm Identifiers for the Module-Lattice-Based Digital Signature Algorithm (ML-DSA)", Work in Progress, Internet- Draft, draft-ietf-lamps-dilithium-certificates-11, 22 May 2025, . [I-D.ietf-pquip-hybrid-signature-spectrums] Bindel, N., Hale, B., Connolly, D., and F. D, "Hybrid signature spectrums", Work in Progress, Internet-Draft, draft-ietf-pquip-hybrid-signature-spectrums-06, 9 January 2025, . [I-D.ietf-pquip-pqt-hybrid-terminology] D, F., P, M., and B. Hale, "Terminology for Post-Quantum Traditional Hybrid Schemes", Work in Progress, Internet- Draft, draft-ietf-pquip-pqt-hybrid-terminology-06, 10 January 2025, . [RFC5914] Housley, R., Ashmore, S., and C. Wallace, "Trust Anchor Format", RFC 5914, DOI 10.17487/RFC5914, June 2010, . [RFC7292] Moriarty, K., Ed., Nystrom, M., Parkinson, S., Rusch, A., and M. Scott, "PKCS #12: Personal Information Exchange Syntax v1.1", RFC 7292, DOI 10.17487/RFC7292, July 2014, . [RFC7296] Kaufman, C., Hoffman, P., Nir, Y., Eronen, P., and T. Kivinen, "Internet Key Exchange Protocol Version 2 (IKEv2)", STD 79, RFC 7296, DOI 10.17487/RFC7296, October 2014, . [RFC7299] Housley, R., "Object Identifier Registry for the PKIX Working Group", RFC 7299, DOI 10.17487/RFC7299, July 2014, . Ounsworth, et al. Expires 20 December 2025 [Page 56] Internet-Draft Composite ML-DSA June 2025 [RFC8017] Moriarty, K., Ed., Kaliski, B., Jonsson, J., and A. Rusch, "PKCS #1: RSA Cryptography Specifications Version 2.2", RFC 8017, DOI 10.17487/RFC8017, November 2016, . [RFC8411] Schaad, J. and R. Andrews, "IANA Registration for the Cryptographic Algorithm Object Identifier Range", RFC 8411, DOI 10.17487/RFC8411, August 2018, . [RFC8446] Rescorla, E., "The Transport Layer Security (TLS) Protocol Version 1.3", RFC 8446, DOI 10.17487/RFC8446, August 2018, . [RFC8551] Schaad, J., Ramsdell, B., and S. Turner, "Secure/ Multipurpose Internet Mail Extensions (S/MIME) Version 4.0 Message Specification", RFC 8551, DOI 10.17487/RFC8551, April 2019, . [RFC9180] Barnes, R., Bhargavan, K., Lipp, B., and C. Wood, "Hybrid Public Key Encryption", RFC 9180, DOI 10.17487/RFC9180, February 2022, . Appendix A. Approximate Key and Signature Sizes The sizes listed below are approximate: these values are measured from the test vectors, however, several factors could cause fluctuations in the size of the traditional component. For example, this could be due to: * Compressed vs uncompressed EC point. * The RSA public key (n, e) allows e to vary in size between 3 and n - 1 [RFC8017]. * When the underlying RSA or EC value is itself DER-encoded, integer values could occasionally be shorter than expected due to leading zeros being dropped from the encoding. By contrast, ML-DSA values are always fixed size, so composite values can always be correctly de-serialized based on the size of the ML-DSA component. It is expected for the size values of RSA and ECDSA variants to fluctuate by a few bytes even between subsequent runs of the same composite implementation. Ounsworth, et al. Expires 20 December 2025 [Page 57] Internet-Draft Composite ML-DSA June 2025 Implementations MUST NOT perform strict length checking based on the values in this table except for ML-DSA + EdDSA; since these algorithms produce fixed-size outputs, the values in the table below for these variants MAY be treated as constants. Non-hybrid ML-DSA is included for reference. Ounsworth, et al. Expires 20 December 2025 [Page 58] Internet-Draft Composite ML-DSA June 2025 +=========================================+======+=======+=========+ | Algorithm |Public|Private|Signature| | |key |key | | +=========================================+======+=======+=========+ | id-ML-DSA-44 |1312 |32 |2420 | +-----------------------------------------+------+-------+---------+ | id-ML-DSA-65 |1952 |32 |3309 | +-----------------------------------------+------+-------+---------+ | id-ML-DSA-87 |2592 |32 |4627 | +-----------------------------------------+------+-------+---------+ | id-MLDSA44-RSA2048-PSS-SHA256 |1582 |1250 |2708 | +-----------------------------------------+------+-------+---------+ | id-MLDSA44-RSA2048-PKCS15-SHA256 |1582 |1249 |2708 | +-----------------------------------------+------+-------+---------+ | id-MLDSA44-Ed25519-SHA512 |1344 |64 |2516 | +-----------------------------------------+------+-------+---------+ | id-MLDSA44-ECDSA-P256-SHA256 |1377 |170 |2524 | +-----------------------------------------+------+-------+---------+ | id-MLDSA65-RSA3072-PSS-SHA512 |2350 |1824 |3725 | +-----------------------------------------+------+-------+---------+ | id-MLDSA65-RSA4096-PSS-SHA512 |2478 |2406 |3853 | +-----------------------------------------+------+-------+---------+ | id-MLDSA65-RSA4096-PKCS15-SHA512 |2478 |2408 |3853 | +-----------------------------------------+------+-------+---------+ | id-MLDSA65-ECDSA-P256-SHA512 |2017 |170 |3412 | +-----------------------------------------+------+-------+---------+ | id-MLDSA65-ECDSA-P384-SHA512 |2049 |217 |3444 | +-----------------------------------------+------+-------+---------+ | id-MLDSA65-ECDSA-brainpoolP256r1-SHA512 |2017 |171 |3411 | +-----------------------------------------+------+-------+---------+ | id-MLDSA65-Ed25519-SHA512 |1984 |64 |3405 | +-----------------------------------------+------+-------+---------+ | id-MLDSA87-ECDSA-P384-SHA512 |2689 |217 |4762 | +-----------------------------------------+------+-------+---------+ | id-MLDSA87-ECDSA-brainpoolP384r1-SHA512 |2689 |221 |4761 | +-----------------------------------------+------+-------+---------+ | id-MLDSA87-Ed448-SHAKE256 |2649 |89 |4773 | +-----------------------------------------+------+-------+---------+ | id-MLDSA87-RSA3072-PSS-SHA512 |2990 |1826 |5043 | +-----------------------------------------+------+-------+---------+ | id-MLDSA87-RSA4096-PSS-SHA512 |3118 |2405 |5171 | +-----------------------------------------+------+-------+---------+ | id-MLDSA87-ECDSA-P521-SHA512 |2085 |273 |3480 | +-----------------------------------------+------+-------+---------+ Table 6: Approximate size values of composite ML-DSA Ounsworth, et al. Expires 20 December 2025 [Page 59] Internet-Draft Composite ML-DSA June 2025 Appendix B. Component Algorithm Reference This section provides references to the full specification of the algorithms used in the composite constructions. +=========================+=========================+=============+ | Component Signature | OID |Specification| | Algorithm ID | | | +=========================+=========================+=============+ | id-ML-DSA-44 | 2.16.840.1.101.3.4.3.17 |[FIPS.204] | +-------------------------+-------------------------+-------------+ | id-ML-DSA-65 | 2.16.840.1.101.3.4.3.18 |[FIPS.204] | +-------------------------+-------------------------+-------------+ | id-ML-DSA-87 | 2.16.840.1.101.3.4.3.19 |[FIPS.204] | +-------------------------+-------------------------+-------------+ | id-Ed25519 | 1.3.101.112 |[RFC8032], | | | |[RFC8410] | +-------------------------+-------------------------+-------------+ | id-Ed448 | 1.3.101.113 |[RFC8032], | | | |[RFC8410] | +-------------------------+-------------------------+-------------+ | ecdsa-with-SHA256 | 1.2.840.10045.4.3.2 |[RFC5758], | | | |[RFC5480], | | | |[SEC1], | | | |[X9.62_2005] | +-------------------------+-------------------------+-------------+ | ecdsa-with-SHA384 | 1.2.840.10045.4.3.3 |[RFC5758], | | | |[RFC5480], | | | |[SEC1], | | | |[X9.62_2005] | +-------------------------+-------------------------+-------------+ | ecdsa-with-SHA512 | 1.2.840.10045.4.3.4 |[RFC5758], | | | |[RFC5480], | | | |[SEC1], | | | |[X9.62_2005] | +-------------------------+-------------------------+-------------+ | sha256WithRSAEncryption | 1.2.840.113549.1.1.11 |[RFC8017] | +-------------------------+-------------------------+-------------+ | sha384WithRSAEncryption | 1.2.840.113549.1.1.12 |[RFC8017] | +-------------------------+-------------------------+-------------+ | id-RSASSA-PSS | 1.2.840.113549.1.1.10 |[RFC8017] | +-------------------------+-------------------------+-------------+ Table 7: Component Signature Algorithms used in Composite Constructions Ounsworth, et al. Expires 20 December 2025 [Page 60] Internet-Draft Composite ML-DSA June 2025 +==================+=======================+===================+ | Elliptic CurveID | OID | Specification | +==================+=======================+===================+ | secp256r1 | 1.2.840.10045.3.1.7 | [RFC6090], [SEC2] | +------------------+-----------------------+-------------------+ | secp384r1 | 1.3.132.0.34 | [RFC5480], | | | | [RFC6090], [SEC2] | +------------------+-----------------------+-------------------+ | secp521r1 | 1.3.132.0.35 | [RFC5480], | | | | [RFC6090], [SEC2] | +------------------+-----------------------+-------------------+ | brainpoolP256r1 | 1.3.36.3.3.2.8.1.1.7 | [RFC5639] | +------------------+-----------------------+-------------------+ | brainpoolP384r1 | 1.3.36.3.3.2.8.1.1.11 | [RFC5639] | +------------------+-----------------------+-------------------+ Table 8: Elliptic Curves used in Composite Constructions +=============+=========================+===============+ | HashID | OID | Specification | +=============+=========================+===============+ | id-sha256 | 2.16.840.1.101.3.4.2.1 | [RFC6234] | +-------------+-------------------------+---------------+ | id-sha512 | 2.16.840.1.101.3.4.2.3 | [RFC6234] | +-------------+-------------------------+---------------+ | id-shake256 | 2.16.840.1.101.3.4.2.18 | [FIPS.202] | +-------------+-------------------------+---------------+ | id-mgf1 | 1.2.840.113549.1.1.8 | [RFC8017] | +-------------+-------------------------+---------------+ Table 9: Hash algorithms used in pre-hashed Composite Constructions to build PH element Appendix C. Component AlgorithmIdentifiers for Public Keys and Signatures The following sections list explicitly the DER encoded AlgorithmIdentifier that MUST be used when reconstructing SubjectPublicKeyInfo and Signature Algorithm objects for each component algorithm type, which may be required for example if cryptographic library requires the public key in this form in order to process each component algorithm. The public key BIT STRING should be taken directly from the respective component of the Composite ML-DSA public key. Ounsworth, et al. Expires 20 December 2025 [Page 61] Internet-Draft Composite ML-DSA June 2025 For newer Algorithms like Ed25519 or ML-DSA the AlgorithmIdentifiers are the same for Public Key and Signature. Older Algorithms have different AlgorithmIdentifiers for keys and signatures and are specified separately here for each component. *ML-DSA-44* AlgorithmIdentifier of Public Key and Signature ASN.1: algorithm AlgorithmIdentifier ::= { algorithm id-ML-DSA-44 -- (2 16 840 1 101 3 4 3 17) } DER: 30 0B 06 09 60 86 48 01 65 03 04 03 11 *ML-DSA-65* AlgorithmIdentifier of Public Key and Signature ASN.1: algorithm AlgorithmIdentifier ::= { algorithm id-ML-DSA-65 -- (2 16 840 1 101 3 4 3 18) } DER: 30 0B 06 09 60 86 48 01 65 03 04 03 12 *ML-DSA-87* AlgorithmIdentifier of Public Key and Signature ASN.1: algorithm AlgorithmIdentifier ::= { algorithm id-ML-DSA-87 -- (2 16 840 1 101 3 4 3 19) } DER: 30 0B 06 09 60 86 48 01 65 03 04 03 13 *RSASSA-PSS 2048* AlgorithmIdentifier of Public Key Ounsworth, et al. Expires 20 December 2025 [Page 62] Internet-Draft Composite ML-DSA June 2025 Note that we suggest here to use id-RSASSA-PSS (1.2.840.113549.1.1.10) as the public key OID for RSA-PSS, although most implementations also would accept rsaEncryption (1.2.840.113549.1.1.1), and some might in fact prefer or require it. ASN.1: algorithm AlgorithmIdentifier ::= { algorithm id-RSASSA-PSS -- (1.2.840.113549.1.1.10) } DER: 30 0B 06 09 2A 86 48 86 F7 0D 01 01 0A AlgorithmIdentifier of Signature ASN.1: signatureAlgorithm AlgorithmIdentifier ::= { algorithm id-RSASSA-PSS, -- (1.2.840.113549.1.1.10) parameters ANY ::= { AlgorithmIdentifier ::= { algorithm id-sha256, -- (2.16.840.1.101.3.4.2.1) parameters NULL }, AlgorithmIdentifier ::= { algorithm id-mgf1, -- (1.2.840.113549.1.1.8) parameters AlgorithmIdentifier ::= { algorithm id-sha256, -- (2.16.840.1.101.3.4.2.1) parameters NULL } }, saltLength 32 } } DER: 30 41 06 09 2A 86 48 86 F7 0D 01 01 0A 30 34 A0 0F 30 0D 06 09 60 86 48 01 65 03 04 02 01 05 00 A1 1C 30 1A 06 09 2A 86 48 86 F7 0D 01 01 08 30 0D 06 09 60 86 48 01 65 03 04 02 01 05 00 A2 03 02 01 20 *RSASSA-PSS 3072 & 4096* AlgorithmIdentifier of Public Key Ounsworth, et al. Expires 20 December 2025 [Page 63] Internet-Draft Composite ML-DSA June 2025 ASN.1: algorithm AlgorithmIdentifier ::= { algorithm id-RSASSA-PSS -- (1.2.840.113549.1.1.10) } DER: 30 0B 06 09 2A 86 48 86 F7 0D 01 01 0A AlgorithmIdentifier of Signature ASN.1: signatureAlgorithm AlgorithmIdentifier ::= { algorithm id-RSASSA-PSS, -- (1.2.840.113549.1.1.10) parameters ANY ::= { AlgorithmIdentifier ::= { algorithm id-sha512, -- (2.16.840.1.101.3.4.2.3) parameters NULL }, AlgorithmIdentifier ::= { algorithm id-mgf1, -- (1.2.840.113549.1.1.8) parameters AlgorithmIdentifier ::= { algorithm id-sha512, -- (2.16.840.1.101.3.4.2.3) parameters NULL } }, saltLength 64 } } DER: 30 41 06 09 2A 86 48 86 F7 0D 01 01 0A 30 34 A0 0F 30 0D 06 09 60 86 48 01 65 03 04 02 03 05 00 A1 1C 30 1A 06 09 2A 86 48 86 F7 0D 01 01 08 30 0D 06 09 60 86 48 01 65 03 04 02 03 05 00 A2 03 02 01 40 *RSASSA-PKCS1-v1_5 2048* AlgorithmIdentifier of Public Key ASN.1: algorithm AlgorithmIdentifier ::= { algorithm rsaEncryption, -- (1.2.840.113549.1.1.1) parameters NULL } DER: 30 0D 06 09 2A 86 48 86 F7 0D 01 01 01 05 00 AlgorithmIdentifier of Signature Ounsworth, et al. Expires 20 December 2025 [Page 64] Internet-Draft Composite ML-DSA June 2025 ASN.1: signatureAlgorithm AlgorithmIdentifier ::= { algorithm sha256WithRSAEncryption, -- (1.2.840.113549.1.1.11) parameters NULL } DER: 30 0D 06 09 2A 86 48 86 F7 0D 01 01 0D 05 00 *RSASSA-PKCS1-v1_5 3072 & 4096* AlgorithmIdentifier of Public Key ASN.1: algorithm AlgorithmIdentifier ::= { algorithm rsaEncryption, -- (1.2.840.113549.1.1.1) parameters NULL } DER: 30 0D 06 09 2A 86 48 86 F7 0D 01 01 01 05 00 AlgorithmIdentifier of Signature ASN.1: signatureAlgorithm AlgorithmIdentifier ::= { algorithm sha512WithRSAEncryption, -- (1.2.840.113549.1.1.13) parameters NULL } DER: 30 0D 06 09 2A 86 48 86 F7 0D 01 01 0D 05 00 *ECDSA NIST P256* AlgorithmIdentifier of Public Key Ounsworth, et al. Expires 20 December 2025 [Page 65] Internet-Draft Composite ML-DSA June 2025 ASN.1: algorithm AlgorithmIdentifier ::= { algorithm id-ecPublicKey -- (1.2.840.10045.2.1) parameters ANY ::= { AlgorithmIdentifier ::= { algorithm secp256r1 -- (1.2.840.10045.3.1.7) } } } DER: 30 13 06 07 2A 86 48 CE 3D 02 01 06 08 2A 86 48 CE 3D 03 01 07 AlgorithmIdentifier of Signature ASN.1: signature AlgorithmIdentifier ::= { algorithm ecdsa-with-SHA256 -- (1.2.840.10045.4.3.2) } DER: 30 0A 06 08 2A 86 48 CE 3D 04 03 02 *ECDSA NIST P384* AlgorithmIdentifier of Public Key ASN.1: algorithm AlgorithmIdentifier ::= { algorithm id-ecPublicKey -- (1.2.840.10045.2.1) parameters ANY ::= { AlgorithmIdentifier ::= { algorithm secp384r1 -- (1.3.132.0.34) } } } DER: 30 10 06 07 2A 86 48 CE 3D 02 01 06 05 2B 81 04 00 22 AlgorithmIdentifier of Signature Ounsworth, et al. Expires 20 December 2025 [Page 66] Internet-Draft Composite ML-DSA June 2025 ASN.1: signature AlgorithmIdentifier ::= { algorithm ecdsa-with-SHA384 -- (1.2.840.10045.4.3.3) } DER: 30 0A 06 08 2A 86 48 CE 3D 04 03 03 *ECDSA NIST P521* AlgorithmIdentifier of Public Key ASN.1: algorithm AlgorithmIdentifier ::= { algorithm id-ecPublicKey -- (1.2.840.10045.2.1) parameters ANY ::= { AlgorithmIdentifier ::= { algorithm secp521r1 -- (1.3.132.0.35) } } } DER: 30 10 06 07 2A 86 48 CE 3D 02 01 06 05 2B 81 04 00 23 AlgorithmIdentifier of Signature ASN.1: signature AlgorithmIdentifier ::= { algorithm ecdsa-with-SHA512 -- (1.2.840.10045.4.3.4) } DER: 30 0A 06 08 2A 86 48 CE 3D 04 03 04 *ECDSA Brainpool-P256* AlgorithmIdentifier of Public Key Ounsworth, et al. Expires 20 December 2025 [Page 67] Internet-Draft Composite ML-DSA June 2025 ASN.1: algorithm AlgorithmIdentifier ::= { algorithm id-ecPublicKey -- (1.2.840.10045.2.1) parameters ANY ::= { AlgorithmIdentifier ::= { algorithm brainpoolP256r1 -- (1.3.36.3.3.2.8.1.1.7) } } } DER: 30 14 06 07 2A 86 48 CE 3D 02 01 06 09 2B 24 03 03 02 08 01 01 07 AlgorithmIdentifier of Signature ASN.1: signature AlgorithmIdentifier ::= { algorithm ecdsa-with-SHA256 -- (1.2.840.10045.4.3.2) } DER: 30 0A 06 08 2A 86 48 CE 3D 04 03 02 *ECDSA Brainpool-P384* AlgorithmIdentifier of Public Key ASN.1: algorithm AlgorithmIdentifier ::= { algorithm id-ecPublicKey -- (1.2.840.10045.2.1) parameters ANY ::= { AlgorithmIdentifier ::= { algorithm brainpoolP384r1 -- (1.3.36.3.3.2.8.1.1.11) } } } DER: 30 14 06 07 2A 86 48 CE 3D 02 01 06 09 2B 24 03 03 02 08 01 01 0B AlgorithmIdentifier of Signature Ounsworth, et al. Expires 20 December 2025 [Page 68] Internet-Draft Composite ML-DSA June 2025 ASN.1: signature AlgorithmIdentifier ::= { algorithm ecdsa-with-SHA384 -- (1.2.840.10045.4.3.3) } DER: 30 0A 06 08 2A 86 48 CE 3D 04 03 03 *Ed25519* AlgorithmIdentifier of Public Key and Signature ASN.1: algorithm AlgorithmIdentifier ::= { algorithm id-Ed25519 -- (1.3.101.112) } DER: 30 05 06 03 2B 65 70 *Ed448* AlgorithmIdentifier of Public Key and Signature ASN.1: algorithm AlgorithmIdentifier ::= { algorithm id-Ed448 -- (1.3.101.113) } DER: 30 05 06 03 2B 65 71 Appendix D. Message Representative Examples This section provides examples of constructing the message representative M', showing all intermediate values. This is intended to be useful for debugging purposes. The input message for this example is the hex string "00 01 02 03 04 05 06 07 08 09". Each input component is shown. Note that values are shown hex- encoded for display purposes only, they are actually raw binary values. * Prefix is the fixed constant defined in Section 3.2. Ounsworth, et al. Expires 20 December 2025 [Page 69] Internet-Draft Composite ML-DSA June 2025 * Domain is the specific domain separator for this composite algorithm, as defined in Section 7.1. * len(ctx) is the length of the Message context String which is 00 when no context is used. * ctx is the Message context string used in the composite signature combiner. It is empty in this example. * r is a random 32-byte value chosen by the signer. * PH(r||M) is the output of hashing the randomizer together with the message M. Finally, the fully assembled M' is given, which is simply the concatenation of the above values. First is an example of constructing the message representative M' for MLDSA65-ECDSA-P256-SHA256 without a context string ctx. Ounsworth, et al. Expires 20 December 2025 [Page 70] Internet-Draft Composite ML-DSA June 2025 Example of id-MLDSA65-ECDSA-P256-SHA512 construction of M'. # Inputs: M: 00010203040506070809 ctx: # Components of M': Prefix: 436f6d706f73697465416c676f726974686d5369676e61747572657332303235 Domain: 060b6086480186fa6b50090108 len(ctx): 00 ctx: r: 720e29e4371710a31ef4741c2803b0bcbca3d94d4138c2704f45cc1b22866e5a PH(M): 0f89ee1fcb7b0a4f7809d1267a029719004c5a5e5ec323a7c3523a20974f9a3 f202f56fadba4cd9e8d654ab9f2e96dc5c795ea176fa20ede8d854c342f903533 # Outputs: # M' = Prefix || Domain || len(ctx) || ctx || r || PH(M) M': 436f6d706f73697465416c676f726974686d5369676e6174757265733230323506 0b6086480186fa6b5009010800720e29e4371710a31ef4741c2803b0bcbca3d94d4138 c2704f45cc1b22866e5a0f89ee1fcb7b0a4f7809d1267a029719004c5a5e5ec323a7c3 523a20974f9a3f202f56fadba4cd9e8d654ab9f2e96dc5c795ea176fa20ede8d854c34 2f903533 Second is an example of constructing the message representative M' for MLDSA65-ECDSA-P256-SHA256 with a context string ctx. The inputs are similar to the first example with the exception that there is an 8 byte context string 'ctx'. Ounsworth, et al. Expires 20 December 2025 [Page 71] Internet-Draft Composite ML-DSA June 2025 Example of id-MLDSA65-ECDSA-P256-SHA512 construction of M'. # Inputs: M: 00010203040506070809 ctx: 0813061205162623 # Components of M': Prefix: 436f6d706f73697465416c676f726974686d5369676e61747572657332303235 Domain: 060b6086480186fa6b50090108 len(ctx): 08 ctx: 0813061205162623 r: 9bc35bce21615ae424cd61c1d677104e35e832d0146e3dca41d52fc942d1b713 PH(M): 0f89ee1fcb7b0a4f7809d1267a029719004c5a5e5ec323a7c3523a20974f9a3 f202f56fadba4cd9e8d654ab9f2e96dc5c795ea176fa20ede8d854c342f903533 # Outputs: # M' = Prefix || Domain || len(ctx) || ctx || r || PH(M) M': 436f6d706f73697465416c676f726974686d5369676e6174757265733230323506 0b6086480186fa6b500901080808130612051626239bc35bce21615ae424cd61c1d677 104e35e832d0146e3dca41d52fc942d1b7130f89ee1fcb7b0a4f7809d1267a02971900 4c5a5e5ec323a7c3523a20974f9a3f202f56fadba4cd9e8d654ab9f2e96dc5c795ea17 6fa20ede8d854c342f903533 Appendix E. Test Vectors The following test vectors are provided in a format similar to the NIST ACVP Known-Answer-Tests (KATs). The structure is that a global message m is signed over in all test cases. m is the ASCII string "The quick brown fox jumps over the lazy dog." Within each test case there are the following values: * tcId the name of the algorithm. * pk the verification public key. * x5c a self-signed X.509 certificate of the public key. Ounsworth, et al. Expires 20 December 2025 [Page 72] Internet-Draft Composite ML-DSA June 2025 * sk the raw signature private key. * sk_pkcs8 the signature private key in a PKCS#8 object. * s the signature value. Implementers should be able to perform the following tests using the test vectors below: 1. Load the public key pk or certificate x5c and use it to verify the signature s over the message m. 2. Validate the self-signed certificate x5c. 3. Load the signing private key sk or sk_pkcs8 and use it to produce a new signature which can be verified using the provided pk or x5c. Test vectors are provided for each underlying ML-DSA algorithm in isolation for the purposes of debugging. Due to the length of the test vectors, some readers will prefer to retrieve the non-word-wrapped copy from GitHub. The reference implementation written in python that generated them is also available: https://github.com/lamps-wg/draft-composite-sigs/tree/main/src TODO: lock this to a specific commit. { "m": "VGhlIHF1aWNrIGJyb3duIGZveCBqdW1wcyBvdmVyIHRoZSBsYXp5IGRvZy4=", "tests": [ { "tcId": "id-ML-DSA-44", "pk": "MWOZC82bI72QlFjSYCyzOZTU 3GKNbWCcD1LEaOeJppclXv90/bNYaOCPjWbbuWpL4zGIr26O1Q1ImdvqMaeJm25qu8e+ RfxTDxoYpnZKgNlphI+D6M3fjn8IWMxcDTug5L5KGWh00DgZzBUEbyMAFUV8tdtF83rp y6k1eactvYlJVXF/7cj3JWLeZyib2pBmBMP9FQRYZunGeojx6TZnO5urSmMdmjlT+qwx A7fdCJrmUSgYce2NZok5o/XoM5vOPfxwOkN2N7//i089/9h2IOpH1myPyNt+rIlllUIJ jDc7sYBZJQthtyUx26tj9OmyU8mwRp/NrA7cNBmoyTOGoy9ia9rxUzAdx4JettuxlOFs Myb05j8b/etInkxmS+3aG6204mlb3TVqXzy1w8/bdwai9l4qXFZ5zmgWK0px9m+rWC91 eSBy5TwZtVPMk43CjtLEC6pJ9nrIetFG+wAoKMHqpQD3tEJNoBCrtv/9k1IEo2EZdMPp fiZVIFGIE5q4+dLGCyF41VdvtDRe+U5xb5NqmiVK3gisCm3fNn8Zh4EKxb9sRIj9EWhY eXIcSv2lvupahB4yJAZzQHZ4MI00XGvToCvhnBVqJrXSefkHEumq2yfCVMsTr14UXfcz py3oAZ2kT5SREkPsQjlF3R0Qa0/RJ+tOOmtf3xMypupGvAZOG4foaakLtggDY0vasN3M Ounsworth, et al. Expires 20 December 2025 [Page 73] Internet-Draft Composite ML-DSA June 2025 QMhMaf01ES7bADeRcv2Oo3JxdwRKML0MUV4/xlvx0yiWWC9chMHRnly/F9SRQg2pAu7N cof/Ho1sjd+QyB6Q07AfDrw3oSmtoaEx/2d49zbsSHXmHbV2w1jcICXnj76T5YbgFwCb s0BrEpKcVHJhF2cSkPkwGChTCayRDmsfvNNwkETkyYNsMTpesL6Ldxcsma9QM1YGsnJA UZjSFw+0dXyS5KJfjGboTAoerqZDYXDHpEnSIDHwDCVag/YUBwPquXVALhYpVsILwbby zaS1eYUd4muIEtVNEsG3O6Tx53izEn1nEJKX6ChJfVs9bYYcZ7LBnL/UuxvaPh4FWOho gAu5hH2+eqMPNn2mhcVMVNwHPh3Tg6bl5ra29GucIbM92Uu7AG0Hxk7KDw4MrTVr3RF5 rFsORGNDoO8CTcVjxjRD/7VWw+s5nU9RHwvyzKCKrvu+CgaVFP+IHQJLCWWmcxCItlyq mTpYvCCT3K3oTSNudDeP0aXt4P25uOi42s9FnpfL/mN7ujnzSRABh5DvWlmUzmgwvxva WFTx0ipHaaVWnq/xRN+UFKogo7hhc/u728wocPP5lNpcubyf5v29ZwaJ8VX2TewFpRAo /JUAsRAWxqRfceIVFjIqR3qkttrRO8P2BSaVFxQ3LiliXOWaffWo4f60iifAUREwPhYh d6pfvmXZILGe76oR0st9wqzdBsIrXU5sL4/vzZt+kyNIXq/GLS8DlMIh5grW20nYlr6A nzeox0qCGrCUjcKaeOFnQfnWY79uIclU5kAFjY8ULoOo34zYiImjnI5Au2qqWfYe0JBf F0UAQWO+1GPM0wd8YGwjBSNfBGxjRRIIF/8NZ+K3rWq+q1QwW9kH5lTZf9RTOu+uxVCg XUVnPY6pST+b1zx63sCSIp0mqzTEsoI/X06EUR/2G7qm78IxEXJUMu4ysoZ38ODmjIL2 Ol5SZz8xq2BAF5MtNSesGgFhNsBLid/xTWGQBtGLp4RFJYQit754LjaSGsxnDnTx1Awh yQkEEryQLOkKnbi6yAQQKkHjBg==", "x5c": "MIIPjDCCBgKgAwIBAgIUKf6kmvcaT fhB3/7O67gsrYhaZ/UwCwYJYIZIAWUDBAMRMDYxDTALBgNVBAoMBElFVEYxDjAMBgNVB AsMBUxBTVBTMRUwEwYDVQQDDAxpZC1NTC1EU0EtNDQwHhcNMjUwNjE3MTM0ODEwWhcNM zUwNjE4MTM0ODEwWjA2MQ0wCwYDVQQKDARJRVRGMQ4wDAYDVQQLDAVMQU1QUzEVMBMGA 1UEAwwMaWQtTUwtRFNBLTQ0MIIFMjALBglghkgBZQMEAxEDggUhADFjmQvNmyO9kJRY0 mAsszmU1NxijW1gnA9SxGjniaaXJV7/dP2zWGjgj41m27lqS+MxiK9ujtUNSJnb6jGni ZtuarvHvkX8Uw8aGKZ2SoDZaYSPg+jN345/CFjMXA07oOS+ShlodNA4GcwVBG8jABVFf LXbRfN66cupNXmnLb2JSVVxf+3I9yVi3mcom9qQZgTD/RUEWGbpxnqI8ek2Zzubq0pjH Zo5U/qsMQO33Qia5lEoGHHtjWaJOaP16DObzj38cDpDdje//4tPPf/YdiDqR9Zsj8jbf qyJZZVCCYw3O7GAWSULYbclMdurY/TpslPJsEafzawO3DQZqMkzhqMvYmva8VMwHceCX rbbsZThbDMm9OY/G/3rSJ5MZkvt2huttOJpW901al88tcPP23cGovZeKlxWec5oFitKc fZvq1gvdXkgcuU8GbVTzJONwo7SxAuqSfZ6yHrRRvsAKCjB6qUA97RCTaAQq7b//ZNSB KNhGXTD6X4mVSBRiBOauPnSxgsheNVXb7Q0XvlOcW+TapolSt4IrApt3zZ/GYeBCsW/b ESI/RFoWHlyHEr9pb7qWoQeMiQGc0B2eDCNNFxr06Ar4ZwVaia10nn5BxLpqtsnwlTLE 69eFF33M6ct6AGdpE+UkRJD7EI5Rd0dEGtP0SfrTjprX98TMqbqRrwGThuH6GmpC7YIA 2NL2rDdzEDITGn9NREu2wA3kXL9jqNycXcESjC9DFFeP8Zb8dMollgvXITB0Z5cvxfUk UINqQLuzXKH/x6NbI3fkMgekNOwHw68N6EpraGhMf9nePc27Eh15h21dsNY3CAl54++k +WG4BcAm7NAaxKSnFRyYRdnEpD5MBgoUwmskQ5rH7zTcJBE5MmDbDE6XrC+i3cXLJmvU DNWBrJyQFGY0hcPtHV8kuSiX4xm6EwKHq6mQ2Fwx6RJ0iAx8AwlWoP2FAcD6rl1QC4WK VbCC8G28s2ktXmFHeJriBLVTRLBtzuk8ed4sxJ9ZxCSl+goSX1bPW2GHGeywZy/1Lsb2 j4eBVjoaIALuYR9vnqjDzZ9poXFTFTcBz4d04Om5ea2tvRrnCGzPdlLuwBtB8ZOyg8OD K01a90ReaxbDkRjQ6DvAk3FY8Y0Q/+1VsPrOZ1PUR8L8sygiq77vgoGlRT/iB0CSwllp nMQiLZcqpk6WLwgk9yt6E0jbnQ3j9Gl7eD9ubjouNrPRZ6Xy/5je7o580kQAYeQ71pZl M5oML8b2lhU8dIqR2mlVp6v8UTflBSqIKO4YXP7u9vMKHDz+ZTaXLm8n+b9vWcGifFV9 k3sBaUQKPyVALEQFsakX3HiFRYyKkd6pLba0TvD9gUmlRcUNy4pYlzlmn31qOH+tIonw FERMD4WIXeqX75l2SCxnu+qEdLLfcKs3QbCK11ObC+P782bfpMjSF6vxi0vA5TCIeYK1 ttJ2Ja+gJ83qMdKghqwlI3CmnjhZ0H51mO/biHJVOZABY2PFC6DqN+M2IiJo5yOQLtqq ln2HtCQXxdFAEFjvtRjzNMHfGBsIwUjXwRsY0USCBf/DWfit61qvqtUMFvZB+ZU2X/UU zrvrsVQoF1FZz2OqUk/m9c8et7AkiKdJqs0xLKCP19OhFEf9hu6pu/CMRFyVDLuMrKGd /Dg5oyC9jpeUmc/MatgQBeTLTUnrBoBYTbAS4nf8U1hkAbRi6eERSWEIre+eC42khrMZ w508dQMIckJBBK8kCzpCp24usgEECpB4wajEjAQMA4GA1UdDwEB/wQEAwIHgDALBglgh kgBZQMEAxEDggl1ALHO3eSQhU3Z/HwYayUCtNvF1JcS4VLCsFeKiqCrWcGZ9qRyk5EHj Ounsworth, et al. 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Expires 20 December 2025 [Page 93] Internet-Draft Composite ML-DSA June 2025 6VP/CFdRThrRR/dfyIudbOnrIESOa9YTBKl/fUBq+erue4c8qSzJlExBJNqDeWgJkK2b kIa6YtAufeCYfp4LqVi8tSKx2VQl+7DmV/xOEoUcMNeVvU+q0JyJjy+6+H/k/z1q9yKA dLnf4ABwWA7mZcwfqxrq6f74pXW53X7ASCw5uj1YzOGfPCILRby9klSmoqzzXlE9u1Ce MUU5sBgmjC4GAuD8BUFSxQcCzItDmHqgFvEKheBzRLrsZ9OS54WgSj0Hi7ZLWxV+DaIp IKenvJyqu0AKw5zQH0uMTx0rmkPZv7BdMJmCrqXq3+0KIBY65gGKUsXTXlfX9QN4jfJX q0RmUPl8AJnXfcgCoXEJNG5ijUCld0cqB2BWuMPYFbDPf6qEJb4NiF13R3UH/y4znZvU UOk2kFcvh58eoUTGV7f23V5OL0qBzkZAlJc3vgDW4ZBfE11XjVBDpMtEH4yBDtO8q+K3 kXj3EUV8VhgyKbMcHli34QWkbUDHSwdLcoEhN7N12WtyxKwLLnM7CmylXE8wqRuzpzlC q8SEeCNSmwlrAquYneC5VVvVCGgLBJ1JPg4tl1ykuQAFzplnRgOV42I4IUwm9U/HFqUZ FfEkU8JvTz8nddPXGjBj9tYu/t28KRhGbTFJeEhZQm+KH5Ml7lqOo4JCIcT0R3y82ebo DIrlCr4hOJ0cau4mSUkpKdSpajzSeqzjOKCh/YKDCCAQoCggEBALK02JOXW+290C65/R PS69cfREhsHIcMeWTfdNn4PwS4XX5xqIKS8zDEmbTPBKWQHzxKy5QjX2SqgpVOEfrlX9 P+0WI9jWSgW3zGadgUiHJyKkDiE8X4PeTslvaogsrHnF9bkKLYheesKWFE8gDq+nfqUW b0oRCx7DpaFkyMcIgommKydm3key3xziJcEftWYMGYF7bG75PkqlrDJFBCTvEwzieZyf 3F4XFegCMG4ei3HUen665lD8mjEeitrgIOURaOVKBGco/fuNSkJFl/jVoww5PYC4idSz KRMrhfB4CBD6W1U0jY97F/VB1dRLKLg+gxXBp358djuFbXo5hlyeUCAwEAAaMSMBAwDg YDVR0PAQH/BAQDAgeAMA0GC2CGSAGG+mtQCQEBA4IKlQDkvA3fVQBoct92VDBLyAXEeF /l1KjkFWuZmHbfy2WX7QjeVc5Lq4qaT175NCs9vPar6EkGmZ6LHa5/dLg0qw+IY0Xn2w faQuBFrvw0fGgRK3/Skz0LBB1+dW4hR3+AO5+TYJNFYG1V/WvneBkjmcl9SguDVnoKTb dittxUqfh0QtE6p9VBraIZ9WyauFRGJnNQIihMV9QI7sPnlSa6PBAyhDughVw4RvD97S 2N+E9nKksOMqHsvPIx7KtseLA6T41I+PfPjfPmZ2OH06xx5uke+jF8uStwa45BCPIj2+ tfNnFAcBnD8KjkwT5Hhoy/rUKuwfv891qUMYIX3zvCGg4fk3y9CSM7wT8t0TWFA4/QgA wzRTHOHnz/9ass1JpuGXWGq8ImEPr9XMYGGd3S8ht70x4nMMrHaToJCPYihBWGfuBlbB y+SA8F3zVfkzY49jZq7uGv6eP8W7NP/zhXairhp9J+ihEVfCQaOvNm65UbjCjL70/MRf 2nPjRqo3w9aoph07GXr0Jk2iciJK8osTIPRAvYw0SOVHF41PbJvwJwjgbFsXf2WGSSB0 n02Xtn835a2P2/da3vHu+9DtuSD0h/+FAB1oCqXYoZdCXR4uKDMSXluCws3Nf5vUoWPL bXkKbicAacP0O2H/leEqIBO25/wGVnGBQiBhUly11mhGdZkoNvUfOZ4cBE4Avb2H1RGE RwQHx31wuP8gWDibdYBQLQy6py1UyZw6ocDTDDFfDvWtN7ZI60SvfN03tseg9NHRvuD6 9brVXZanlQILC3Nzri1chVVz7mbOd9Pib5IsCBX5EAZPMcjtlNBOswe9y3M9qyIVdxDg FHu9DTqfqBpCf0ZJ1B22w6xYMvi1lEXfQz1JFheoNFubHDD4HU2CobHOOb7VpaID1xAW aqAR6jxW1R8xXHNTEem3Rgj81sjWIwDggvoBMFD1DXEL9aeArXw/mQOK85TM7HFtHisz 4+alSfMFOO0O4aFb1ZWGtApIJtNOUfy2NgJ/hqdT7/jHvUir74+vS8QLa4rd6hWbQ3ar erF8C/Mx7z3FfJW4PJclsSeUWPaau4Ng3VI1iBEeQzzof4NzaHHP9rsihOcCapYW/yQj zSbYezyHkyfmWbGZHd0QvWxctb+J04r9bV46WDz7PkDVKaiHMmelW6ncZCtCZsJIb1oS 7US700dWg4yqPetGNav+xFPWzXoibpGL/2JdausnnCjNTnYuqUauSESi8oj+eHEOir8j zG+R6A1ohIG9icaYRHGxt2igo6VJSWtcfLOeeIzCfBco9ilmgQezoZSkQVqBYmM5Thnn D+pTQzwAsH1pk6OIpC2OsaF+O5UVAyMCiS2QJHj8/054wkTMEtRlVfpVqwIVSNhH8vr9 YJrMsrgy3/fVrpfUfLyf10HK1gSyXlTJHcHQLwzDJ8ORW4u3gG1aYCx9OQ6RUTmJfSbY AxdW2zSIPwPFh2yyQutCrI2uAND0uF0tAIdh6bwOgUpblL2PBZdl8JLAvEjoPgy0NBXp 9YR7W3nIlvAFjUsWfJmqfExxTCj6x2d252KqtTfj+KXDRpoBQoJqwCn1p84gKA/3fgS0 r8f6YpEIRfesOmhgj9WFUVLRxdb6CijL1HEJO3mK9pwZwyCe3LcYYHVXZkVHyeXhT4FQ eCtC6C9Vu3XnRcocI46phkphJCMXFPK104C94txXXMacXKseqyrEjV2HvGVY5esIS5Fy k+SjpMSUmxcc2jypIJaPiQoo49NFKZb9/yYHklZqmxEt230Q8GhWXA2xuTZWJTqTFaRo Rj845IBPdRGDyUDkGR3on5XPtpqK1hIm8q9qvxG3fLg+cgChrqJNxqLuQk3mlSlhZgzo 2dwxmQv+ipj0nFScV38jIAXU2Wr1972HZGj7XS1jaVHqF7tl9ijqWPXdhnDomVhJowa9 kFbnWePqiZSdv9UL28WPE1cgm7CeXIv7R8GG/ESeN+QbEaYTaa9apsYRnIa8l/UnnNUN CXfkufr662IOrFbAlnHZjnbwtlnH+LrefLn5RP50F0G8U7VMIrLu34ND2OVd9AF+oya1 XPjcPbaDt3zJTneDUCv6oyHv6LXYb4hLAGuD4VZCI7vdW3iasT+TzgJAwRzorr73IWK9 Ounsworth, et al. Expires 20 December 2025 [Page 94] Internet-Draft Composite ML-DSA June 2025 Epvvo8MDR+f/1GRXq3BS9LweCFEXB8F+j265orQa4cy9jhpNNAukcQNrk1Wtg8am9dYy CGWd+Szs/V5sh9LRQhGB2MYpkLvruXQlK9HOtDvrHPPdA5QFL6/4xUVkwFd8FNiWVb5z mWM2MJu7Gg3dN4Jk3mo1imhi/yTAdM48QHJ0GfHA8658KbDyvdD9NjWDcrF0RFFSIbFn LNFRPK15UAqdlBEhEsnp4dLZwefFkBbjjHZOEEV2u8NpUF01UYYCPfrU9/qiQ8xdJXIS xWy3RP9WNgJsynAVyRXnZrlGREx4tta7XvYN6Ew1NxUJpQCdQIYfFDgOJXVEJdllIIou XCI+i4tBNxtVulCJxPUTiRsMq13ysJpN81FI9P9x6PNacOSoHC5y7Ck7lvVfGhK4JeAk ZyXEnS/GO7/8UNff1cOCEt0JzBv18V3VLt90ZuuAIevwbeV9woCPoguEaYFeUVd9lwWW mgER+yeWb+TfGacn7z2wMLamsyT1qqtgHg14rxKxHCtWHN+iSjrK/GaOpZw9cnfSWHQy Az8bW+17S2x+PJZbuSU8p2M4FTylvCd0I+JH2pnsCYt0Z70u1OQFmLY6ta/2pBMJdh4l ecZEo+pp2AMXxprOsFZSHxrUxCYWFJbn8XpAIgK79VELZrUB4BkRoQG48YJDg0NAFEb8 W81R+Lkz3DubrK1nH1v0g7onUp3Ra4DopNjHiNiibHrhgr0ZwMdZuZc4LfQ8Uz42WZRD 1mn9E32XE1gMpPIydaaPyQ81lEcLZy5veSZxZ1QiDnVP2lo8ljfpD8vRDPgMRhBMabeA lH5qwuPCYb0TX6QfCvg7zP+BnpnUwQkG6UoHo95aXvvlhL33z9XD1TARArwjj20dvKYM dB6mBvfhXrSOl7W8yxrDCdnv0OdlXR5Zj/eubr2Nzm7YDye/3B60+kUFhu2VMHTJHF6d wwwW12/5Z5FCyOJCt+nD2TaXZ2h/H9XxXoRFZu5vWhkFwJhznKAjsdHWNHZ87nVk0nTV cDdXFEBA4qNkNrdISFiIy9wcXY2+bq+wMHCwwUU1lvcJWnqa2wxszN3PUDEhcvMTdSa4 rC3efxDB4kQEdMUI+mtNzg5uoAAAAAAAAAAAAAAAAAAAATJjNBV0TWYhcvjD3DyHyQHu CWFcj9eLA8POOeaVLWo4xPRRLABOnFjP4lkSA8Y69Xxek+gCvVUzStRuA0Xc5+PumGAY WF2h9m5kV59w9mY3ht63Aw7ENoibVgUST4LIJ7Q/Y5Ile4jWr106V3e+sHlHhXY6pEG9 RFk9egLpvaUtrPualcgA4HlNBUrEezDHAQJqH+mBxdwLKudJ9FokHB+x9AZ/8sDEmkFv kHQKcPqPgazg1zja6da0nQD8ekrzMT6xoaimXLHXSakkcQ2VojGBbACG4Vhw8hhTLovM o9mGZNHxWWDypS/JcXG8qnEuSVlP5BS4l3gHNgOoBkNn5lzxyD1w==", "sk": "qyHL 8cD9ZmXl8qlVUq656fNAOUSbNOvH3w/q8iW8CowwggS9AgEAMA0GCSqGSIb3DQEBAQUA BIIEpzCCBKMCAQACggEBALK02JOXW+290C65/RPS69cfREhsHIcMeWTfdNn4PwS4XX5x qIKS8zDEmbTPBKWQHzxKy5QjX2SqgpVOEfrlX9P+0WI9jWSgW3zGadgUiHJyKkDiE8X4 PeTslvaogsrHnF9bkKLYheesKWFE8gDq+nfqUWb0oRCx7DpaFkyMcIgommKydm3key3x ziJcEftWYMGYF7bG75PkqlrDJFBCTvEwzieZyf3F4XFegCMG4ei3HUen665lD8mjEeit rgIOURaOVKBGco/fuNSkJFl/jVoww5PYC4idSzKRMrhfB4CBD6W1U0jY97F/VB1dRLKL g+gxXBp358djuFbXo5hlyeUCAwEAAQKCAQBNhS+Rzo29MqK1Mk77I3rUxaZsOCGj36Bl Rp280/gaRxOffxRXGAHQfOgkS807OKqkD9oBt9pwo5qjw8r+6DNKlfYkRIkqRnmJRdSy PC34X1e+75MeRJIs1QijlPOvnSlTIDg8u+pSVhdZL3w/M69VB1sqayHXSSctJNkZea5z EVZ2U4CqGDAQTLzAVbS7CxdIHTHtS7FWAxMD0ChuHDD/4w4rUgYCtS/S0QiY05RkUW1m FvysOByJ8KIl71ChKjKAHd1hKZKs+n9k9JQ2X/hFXe9nqOsuyb3/d/V1vMMC1mrTZVud Bv9XMwcJgbKFDgGpA68Oltkw55caUQZjRJ39AoGBAPbQL9o6zOrPXLDxEPVlfuYVKhCw R1ZobKBc1DQvIM2P4QBjcioLaYv8aYh0ZeJSWIJryQuvUM15RDJQ2XMjOPNmivcEnm4M EhNF5ogxOesvUOimO3DF8fS7yL+PQu90udypVRU1sPVJF1DnWKuq8VoaDq81txFyL9zF CgMKJUW3AoGBALlbsFGtwgsHmNdy8/PnSuRVx8v8IyFjsRWzBSaf5WfgqIvkX17/Myrt PtlRpI/2tJqqRKjNt13lPOWs3okVJLzyjAdE1zIaBXSl39zyqgzYajC6+7vNUFF5MA0+ +LvnD7NX3S0dermZ/i9ZIWLbx5h1BRyWdzJ9t7Bv3NbOt81DAoGADvlCbfLzS6uY7AM0 DC9EK6FNFAYdzdg3/uKi3SeezdnUxLlDy9k1ZhDCNk0ZgUmNpRv07oiMVmrtAEB3cMzK P7oQ5DubgQGqdxDek5So9uO//N1Y7daUf0yFOVnvradfP0vmpYrEWZ09lOL0NjYAvn6m NWsE2EIdNT+fA+AxsrECgYBDWDfIhUwB++GhLafKzxcbvLrZtyMAZ5sYWjGd5exQgIRc Rz4LYscxan8yMAKNN8JIi2JkvlFH8RjeDZ/QyHjPmYQcw/s3vdKLnhSmzxfPkPWL/POn OSJcZ554wY9XnczLiTnXwWUsd/GtPEHwDBAJqUKRL23hT2Hk3c+rz/FhxwKBgQDnqhqh IamW9reygKrIvJu830k1wlexHfmx32y2VbBN8F1RSC3Y+oDd7KlG4KTJg/0K0RDlman3 FUZaZ102NnhQ2BJn3KgdP7eGnPN6lu9oadtJjMy7f/GBeV41OPN4PPdeHnkMWtROoZMS 2hvk7EFn2sZ+WQ7aNhW2V8/79O4qTA==", Ounsworth, et al. 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Expires 20 December 2025 [Page 118] Internet-Draft Composite ML-DSA June 2025 +iTOIE4hv6VacX0YaxUHx9CVp3wbnEoGbxARb0q7g7E9eXxOeSxxHzmmQ00VTpOmAgGr QZzcKqjJV377gXQHZDtdQODYhBLBf57vB3iWK5pW+ZipT/1FYHNgr90obzvqxnbWGp7l ZBt/1/6yEQOn7HgZksJwkEj7LcFJS7ww5knp4ErwJaVjtaf1UwSkVQ1LIOEMGpqxoUoP S1KOq3FboNRdopDP+mEGfhE80HtgrjtNptN6NA6xR8TKJwCqLKutFm7VuPnybajkOUpL PJwT3t3Gue+nauYlvpAjzD7Xb2wVt2z8QyUKSdcPuby/pMoAQhc4VEYPUoofdZCOLgdS uAmfqdGw==" }, { "tcId": "id-MLDSA65-RSA4096-PKCS15-SHA512", "pk": " wpj7H3G3ulKvmW7MLTIxY8+9cd9b0Tbsdq4vd3gDHncweys9xTAmo/8J0kHK33Sc9dVr CkeJHVsAZp59xAYKtv8RPHexvkTYhBe2673jG9KPTPTL3uKz11mjnEFSKbDT6EcZib5a /LKt3Bcsw364oN3PF2DbmaR4kF9AgwHa55xmMRvMm+B8agM5GpkfvTQbTN26oGbQCGcC e0AipIEnsidALRovg3bekq/S6afdvg/x61NHGYLfWqRrWynJMi5sIshmmGt48uYlxCsw lOQRiGZgVrmf+XvYKuBP+FRoupuQnVj80fR5FWICmVeV73TlMvXdOowVs8c/BLVtszH2 BoMQ8I/SgdusPe4Z4rNTtFd8rOPfyMEG0wlpDSosrl68D63uG7FYxWnF0c0NHam98nVH TiKb+5c/lrvnIACgMD4Ccibueu5CToZvWx6m67gCndiZ/q/VYKmJl0dWbZuCbnvdx8W2 kp/g2yvypVCB+xrJei6O7dT+LdZuTOgLe9acFQ9Sf4cC+mpLJTf/MMe07Rt6DWE3AklR eU5kugRcVSlaFycdwL2+M8GDDrLKKeTuU6OsOwdSyM8m3cCKsbAxhpHdp3SsIbLQ6FsA 57lRfSuAqcQkDctbqFlxQA7WCMoalRS9NO2otrEVCalkQ4K8R+QwzN3LdgHy0YoE0Rbw HaLHz4taDBioVmDMNu6JaEopdeQuqpMMD7wK3n59gwLMLOpCx3u1rzqTpTjWQxYXEZL/ TvZZ8pECjngmHUDWwkr1hIgvSn3moinkfKmaiOVvF9VVB6+S2tF/7eTcwqHD8ibfKdRz hs3omMw6Tkj9gEeeNHS4TAWn8gxNQ7MsL53zZs8O+coe80DFv81alLB7gC90jxbeqxrm EAD/l7Lm4rP3emtAMBVInBLYOIGo6kB4ijUreURipH7C3dl6gzXQx1WDIXgcIDYmg2ty +bqmljyADaWBqv5AHrTMzCKfiKIkgaa64FkbKTQkfk9AEgXhBktsEerFwApPlQLW9E/8 IXfTDs1CgTk/4qAv2QaMcHbk7BUE29H5t1fASR4Cse6gEgI03Un4Ts69Hax7G6xHkxj9 y9HAx3qo6P/SNw4DolgzkNodMt5lmar3jq21csSeXBKAfQILK4szUA9C1QLZh5JvxuMM n9skIrGdDQ7uHxAbY/L5jwwqFrheYZVuJt9zeCXeJYG0cBWdujvZJjSXIgqERKX8uVKG lNg424+2TlwqWhaHlLgPzluKRv51zK35GShUL5WiRR2q0EzhE9SYSR+EmIZ8fjfXQCvs GEqIRN61K4BzgOuz92A8xSNSeLekFj9dd3jjUi9qSA0VIvKgxpdP1YvA+VATtBlbd4nA Sz8U5tNifAqOT3e1fyxJMmFNsDkuf3Ilt3CQwHJrhoj/CDGOC5u4uwOFqAgz+BwAZkCD rrimmC+ZLGIzv3Rx3AIY0kjqObRyRESrbCkrWRpAcFySgXraeAvH86iyjpYQO+oJ6uBV +icqgkX150FizlNcGy1DfxwmvQYB9mZPgjksdaAlCNbHHO1nvyRapR+n9VWHcZYWr9D3 THLuWN7mRFD1I8wNxrTTk8jFrEEfdVVo4mtz1szBufjEHQCVyc5JEDNVSe/UIbit7IhW s/VAYEkX9WvINKmSfBfA+yL7QSiFrOO34mvcdbEqgQ1C4WU59WpOtEeC5tD5VLnxLhvP wK6WJ3hbHjLgDOuD4DuvBo/OjZ9BUSxGcs6aKxhaIgRKqN6/gPTKT8bnfCjlhW2ROae0 I4M2Jh560gjhDOwOXu74Zk3izaETmtmAS5tcT2eLcEnMi5/CXDHrmH8Y3Tgs158UdIxI KvVZFvb2+QOGwxie4KsLUsL4/b+pYZZ9e3bRvYYQKrZq9ZjmZFkLkBXlqpgq03ew4MzX +4xfuSNdBJmaIUVr7re/WyJ1CZoSZ29M9uG8Xc7gkdbcOv/MjSCLKDEEbK7p0BUBSBAu xUU45ZmXatEJKe92dyrUkAVK1IlBxkbGxqWuG4qmQUKS273nULq3U/dq1yKWq3J+fuMI PtswhGHONl9xnx+UVXKTC7YJJ08+LeAwIOQgkn3+tQpbVAANaifBPQ86wYSpbVwInwEs 5+FMWdJj1rv9H3zU42FtUkhUjGkTRITbFWhhGXfDz2nZjQgwtiwJkzKrPXi0PzqjX/tx HOiGue0kyWMFOk2XpOS6aVAO8XzL1uqHCx41MSlUMA+VUsF6bdbNSGDvhVawiOjpNjgS 4V+EkWw8AWSkB9iZRXVNKp1ylMOkYfDMMSIEo+yhDoed6rjjEbsfopFg+Ncgm5zQU4TO RqBfni1gyYZMrpKlYj5Yvbfxx4soTD48TSoKqaU2541NTSbrIftTGcqHuO+CbhNULFSR ynTRX/hMUI1SAdqGGIC/a1J8WKw8usP898EU3W2XomxprB03N8Q+wY3b4gerZX5OOFGd tTM7Xu1AtJDBhlXEwP5D6NRQEriSMazhQqzPay6vmuzzXDaoetVh8tkoKmlliUTt+0fb w6Zgm3D/oxHGGAq3b+9MbhXjER2KJ81JwPnqrmHhkTVCcMFpMdDdW8mTm0Lv274ckmn4 Ounsworth, et al. 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Expires 20 December 2025 [Page 145] Internet-Draft Composite ML-DSA June 2025 p//Zb7tw7vZJFmZyKVVB4TAQ3bdBqi1BdxJQmywZ5dFcYn+PxIo2zk5kJo5xQ0xIBJsa gELUkEIa7hjksEgcMBlO69PyMNEp6yOskq2tNc1mlzi9qnLYA4Prk+Y3ebMvylHGvJMy u2N50MrnsKu6PrZK6SxJr0OEqEVnfO1DzkcMeuuyEuQf6Ri/gCAXMVIVmqGQLtBPwKru Yd+L0jB+ibIYPB6EcezlJF96K9B1lnfB+LtphbuQZzN6zLmYuUyyPkkoyCQK+cmrYm+z 0ssQ591Ij+bQznc0XGGUDmI4bwLuXTbY9q6tt44wODYfW7h8ci28gp7SidqH8Sq6JdP0 pLZdjHqgXCuGwhKslBgKH2NVNwBKOboIqAHP5G7ju4AW/tlAcKKzCe9QoxOuH3I0HALE 9RVYkCBmNljJqz0Oz2DiYqW2R3nfgAAAAAAAAAAAAAAAAAAAAAAAAGCw4THSUUA/Ur5B LvmKvbgucl/ptKQ60Jli+GqpXnboFXH/Q0u2nBMSVBtK+4kdZ4snSVJQ8D+LciXAXrjp pdeKqLvowB" }, { "tcId": "id-MLDSA87-ECDSA-P384-SHA512", "pk": "H/tN qNuBtieTbe82+2k9s3KeZX9SfXkxlFfYV+XNZ8KVfGW0CVzdQj5tlyb/ryfAUdwZgOBV eElOBYJbuJobmMaNlbrVjZJuwLS3nU18OTYRmtat9lXrZCUE6Ia5gXSEJMK2O3z6V7Da fm0fGf/h7VGLy2Uh00A+8FUNrj2cAPGz5Y6ciX69UIT63mb2day7YpPBybUDhlnUDu6o nEUNN2AoJmr9ApONbBTlEq2tbvv0i18TMikBAfTDmany5sdNboHU/DzaVY5k/X0IyhYW sScj+UDDaAb1JcsVyH/oQmc891mR6eJHRO7UPv4hg1hJhYUxUKJ809UH3zU8OFspHW96 3Rqr+aAB+p/h/DNXbSYotVas2QVQoA987mEOFcmIyr3NEQRF8o8cilXwOJlsARgmJ1b6 Pmj99ojA8kFdjCxE1AiYvXWTh5jVHiilndYmXWJGKogyfAclrc8GQAZoh/5/bKbhMgZk jAfDoHYcuIpD1Zqcrl8TjnKf0bmaT6uPnAyHyPREHDLrYcj9T4ZxFdShNYgy9kh9AIxU euFbmDcs0+cEHZpe/R0Wi5JaZq9MHR03IjJOcKMIXr4kB7UKYGUMoCq3MKw8Hpik+2iS lsXfk3w2Z99/UtTbYX30iXumm9II/oqmC9DDACdz2EQETx4KWdedyjcPyKKMnMMX4CVw iNzo/J/soIx7UE58BEJ4oWJGHpN0xiotKux2xtO9rBSO/P70GPV4vpq00Lx1Mot9IZIb yN73dj5cVQIMuvDuEPD5A422qFrX7C+ToV41daKC9bPmokwIKl8DCIAVKZaqZlJQI4nv aYgZPv5idht6qZO3u6yWX2WtjW3yN5rGj5v4fpZffwUXsRhAC66XDfbFTV2Jxgxu2aef +zn3fkmQ49vV2NZTFptesEAhIVeCsI2ExSt6kv4TvpZuRCOLTRxmC/DJ6iHtQUZePE3f NsneEciog96DFW4Mn2va8/dFuQRpzZevjZfMqd9ielnUaghhiwVqDrfpRENCRmsidSxD bxNKjQ9pDOolYn36xwmAU/ZSnTcY0w4poUa1bfq48BSTP45IVAHTooCiAnk49S5K9cOP JV5FXeewxNE4SGzohiHzmhj3PwUfg5M+Sz3pAcKqLHPxGu76U5Yg+jyOIBzkWWiUiQ3F xmqDOv702n6XA1rCelS5aO2zfT/UAxkZ1QHqBzQ0t+m4J67Ys5wmG3r6w808rQTkbGzO dfuLj3Ur0BCt7+dVHqrkKjR+bwFIObZqsgVAuz1b5YMQeids2eAyyV5IRd4mD5t2BCqf EXP47rG3ngr5HTbKex/RezFX6pV+otkNm0FwDPMeStCcJ//kCq7FWZxu3x14db40Nt5x 1bCJp30HJGFH9AIUTF4RhQVEjY8ZOWAr4O2VctsbSQ5cRz3zAujCRDHihEI5aohdZ+Cy eX36/7WEXNt30EJfI5KIwV26Y3paiLWyLENFBc44+D7JxnT+ZkW36e8YmbjeQGwk6UGZ ur3uEhOfQrHr1Xs835aHjfvQ346rKvU2RbWs9oZnzbJr63GB4fidebHQGzZ943EuaEEZ Er+d2h/dUl0dAIMx+t4OFbMLA7nMLvSJaZBsjJXsrTZrFRN8/5V52Ht1LcwFVkQfZvYV cy6nKm9q9VgQLja6mgs5SX5kB2cP3JoGhAodiCNV2GCKFEyL8CIf968UpjQypNdz37rD 6qRLPuZgol4RIiC7yvYvEYMsqUdsvhCCX28jWxIR0Dm+jxBnlvMSd7NnDD9rBRPhtgc5 0zh470Vc5BSPNdUw/+RuIT8XPDeypktGbOd0NUEfNy90UNLFZEAgL6ijj5+6a1Uf0SMw TVnJFtv7xqd0qd0/ioVbpsqemSvQ5Ilb9ksP2RZghtRHcOkjoBQCv2XMSU2ajQlyQmTc NSGwMZk3MDUMJ/UJ6JMP8qy1fUQ8OnmbDaKjTbqVXBs3OiWdi3ML4Ynw/+3gKKzeAJwX Bw/YsA/nNOPsnBudc8t5wBe64aczLShXVaIK4KPOJCUI4QBrhZ0pVw/5t1xNaBLW0fJk UuFWDDw53woZL5mHKyGZKGYRiRvi3dUWgmUztesQXhziuedHQiJfZSltJn2yJ6pt8M3Q Wc2Wo8epWp3TqeuejggL+9kdx6vsCUX2dk8UpJLjm600AsxVtWw7/37PV6W2cOZbkoNH 7SMDAriVSwQWeNgIi/Db4x2UovJH7LijJ4vtpoODSmEKoWx8JX3QzvaSN2zhzNA1e1IK ub/oMW43XDfr9R7YrBe15tSTCPIcGyrqHSB9MMtopwZWQXjTsXNn3wNaUIGmuWVjfd9M K01Jmck/3ISc46q6IIj014uUZjRV8tengLZaUjttIlxZdPrucedY3zoNARcy0sm4c0vi Ounsworth, et al. 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Expires 20 December 2025 [Page 173] Internet-Draft Composite ML-DSA June 2025 B1HRZ47leRiWRnoTkyUsMRFO0LYOlBbuAlFPiUdirT8GxM0LM5mQf2lBfbussiScOWZp SBvZvNk6bIpZhsgQo6exwEfICcxgZDB3+USL32FqsblOHSlr9sBa3G93OTxqws0jZ2jA RUjWl+ApKzs7fIAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAYQFxwjJCk0qgZbZnCsF2ZHT YDqIrr8D+NB4Eld27tOXEVEjWlz9AkEY7k5DtjYNGsEdJnpqPYkYfwZ/RCptwaTMXaFW GkcrLUgjpQGXmfGuzUT+EO6Il2HeF/CIhm3R7ROUulk/vU3UDZ1IalcxdcsRHAzecDkB Jdf6EKHcrFredSogq1LP7d7s3LAuUyE3hLoyqpIVGdM9dVhgiA7smLrTlrjYxcqgaPmM 67JzdBRYBA2UvTWrjN7wqMD7hfbmwT/tmrdCZYwrcR5C1CwoSTZ0MX+FIS4wx9PyOcMo f2esoH3YnzF8v45iTHeGg8Xsqgb9k+0/uKIJm68Rl7Ee+MsFtqLkdBwIXt5yEvztyofN L3nx5BrHGNa26xIH1RcrVdvEUhAqNbicOXFntf1sAW62B6pkfxl4UkIO9EBcNBgIiug+ m9nuffuoAykP4usDZEkcb7Hc2orU6rcadokvasPCE7+CzX/S7R+qtPHe4F0fYJvl3MR9 xF+wRgJ3UX+AWlcyPLvS4fA" }, { "tcId": "id-MLDSA87-RSA4096-PSS- SHA512", "pk": "D3Xqkwu/EdJSNkdYJzgg9WCbxaFJLS4sExfZr9oF2t6ZslKKRag5 aeA4RKdk09JvWDYxSfUkDNRAEXFWEuD9mRnJnoswIv41+xZOlAAyc8yip+/5fCLMn+FY WKQprlNA3mKhkAgTIao4lESktyuaec89bkZVervM073TqC4IxAanLcCyDmVVF1uGQ802 7hd7nHjlNAlronAs9h3BPUhzKPSqyQeWZ6vKS0Uwzj0hjhxnUaNxTk6afxGKaD/gSVrZ A9DEJArztrGrWdjNUWag3Ojzhn8bsGwKNHr/tn6dE99cmcs6HeNNC/MhQP21nz6NaujH euhJwDQdoI7L/8lzdLtCnEgXt6ryxEloGYuk+Sdm2HnEAYzRCKIyv/56w+daByf5+qeo l+ZRHzrGykm84NDtCMuwZikKb1whhr8fR3mTZFNuYxK/VCFitt2+K5Cc5aEhFuZmrPZE 30AhFdZAhgcgM3WDxpjSng4YZ/CwInR+0V8lOMqAH3mZVShM4mg9W1gLp0xKYCS2rdMo t5FHxALxg8IFdZIr5mzOgIqGm12k1Y9g4tHjA1mQmcMFa9WobsX1YObyo8X+Fmhqw9IV v+rVr6c9UEeM9bo2/YpcAa4kCh5hNlLTfypEWDXXqUu9K+FIjd4/nJoEECA2JrtPWMoS d5qUPuTcv0zITWnjh0C7y+64oFFujUpj8VLFsDbdJkqtPwCmK5s4sss0PeyNTO8veiIU /dlcrNoLOODEX6Yb5wMbrh3FpHs9grUwMSnpgAmPy9Ij6TGpj5PiklcST4yXZ/HteCp5 VvHY9rhX3fGQqWh5any0qYtjoM+qj2+XH7e5gONsO+z68Q5Ijlh+n/1Ob1VRqXa2ULNQ L8xx2yb7s/BinoO4rwuXqOT028L8CiSzsVgNdE7mfT5XYnlFys4IOdSpMXAPcBUfrwmJ 0RLiExbYaQUYrc5BzdLb4EI0Jt9zXnrujxcJH2P/FoSGa4/j68cnB4hPs0erb86q4sIP Km73lqgXs1/dReU0/GZD3yjleDMe0Gue4APrjyS7lkrB3/jcydKaBcFfwYBctNAGGPqP rEgJ77z/VqPzfKzOEMq+SSi2oniVNp0ApdiQFcQkNBkfYpXMO0h7rzdm4UZ1CP+p26p6 OlLwuU00NpJacLFOtSAcGmG/V/WtByMN3REelNBaWWz9ETNBOM9b5B9yqh+pGMm5W+VN B9fW7ohMlKKCTKaA9lQggiGx1mUbSSn6wg4JR3zHHrY6CGoh97N6W7HaSdqCrkinVA/m OqwhgxtrZpHns+tHUbG07elKc9ZIAZoGPpuZXCxyC4NDYoFFkId3t5RN6a3S7EEUU8X8 uIHlLDsRs7QJqVsfLIBcRSxktf1tZArX1DOBhxLZ+6lZ9LK/L1o0FwsBzAP9lKLXaH4v ZPzZEVgox1cvhVWP/A/WBwsN9iusKTXa7cP26QnfZlKf6J0IcvcAM3ObesaWQknd9b5e yf66nNiPmuQRnn9EhtVr6rEAazXtzK5TDXvp0g/1YBx+tjcbzcMeEzxJ7cBnBmazUoE8 /C6MG0+XRT8Z1LSeVRSUD1wkp/fwqgEedqMTRUMWA57JGbdCduOKmS51tcT0unbJLSa8 qcNghYifdpuVbHdJLALZ/8OG679itFxiVdEMhVwka66J6jU57bJGULfOKzu76bq1iau5 yqQOSRcJFpWHraurIZJjqOQFtv6xYNpTW9QzgOopzRkFj7XuXKlhyEKHUeoGcAFkS5bd NQ0IaVhNgaVrmQlBHN52QjukKUdQPF/Sioqexuu0XNY4wWg1q6h9ASVS0PexFnxSJjIL yYZzqO6rrHqbVkHRAikXeLfWz/i/tggReGD2lBcOxbGyEZpLLno/mZmkx9D7hKVaJ7fz azqKfXbVDlBBQdpWfZLLpasTxOepdbnEAHJIJ449UI7HAmrCcUFxnZJtmU7j806o+bWr co/NCJ8tbBEg5TAVMG/Qo8K5FiZhPx3YZaVhU5rLE+3A2ktDf2NGryDk5pT3lwl4+KNV eeE3Ag1TI9bgA+rNhRNzs9FrlGENC4KYmwnAyV1dux/DFC8M+MfkffcOjjtd5HqrPr5A /p9kYN/LLEz7WOJACWei7Sk9+ioeGwGnlPfpyrRXtBsS4Uu7g7RSEt8DOMgP4NhtHByo wmR7WOlrmcNlkAhNyLj5Ku3dqSBgH721PidyAwPBGaHz8iG11rHiwxcwT2GUNsppbwf9 Ounsworth, et al. 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Intellectual Property Considerations The following IPR Disclosure relates to this draft: https://datatracker.ietf.org/ipr/3588/ Appendix G. Contributors and Acknowledgements This document incorporates contributions and comments from a large group of experts. The editors would especially like to acknowledge the expertise and tireless dedication of the following people, who attended many long meetings and generated millions of bytes of electronic mail and VOIP traffic over the past six years in pursuit of this document: Serge Mister (Entrust), Felipe Ventura (Entrust), Richard Kettlewell (Entrust), Ali Noman (Entrust), Daniel Van Geest (CryptoNext), Dr. Britta Hale (Naval Postgraduade School), Tim Hollebeek (Digicert), Panos Kampanakis (Amazon), Chris A. Wood (Apple), Christopher D. Wood (Apple), Sophie Schmieg (Google), Bas Westerbaan (Cloudflare), Deirdre Connolly (SandboxAQ), Richard Kisley (IBM), Piotr Popis (Enigma), François Rousseau, Falko Strenzke, Alexander Ralien (Siemens), José Ignacio Escribano, Jan Oupický, 陳志華 (Abel C. H. Chen, Chunghwa Telecom), 林邦曄 (Austin Lin, Chunghwa Telecom), Zhao Peiduo (Seventh Sense AI), Phil Hallin (Microsoft), Samuel Lee Ounsworth, et al. Expires 20 December 2025 [Page 188] Internet-Draft Composite ML-DSA June 2025 (Microsoft), Alicja Kario (Red Hat), Jean-Pierre Fiset (Crypto4A), Varun Chatterji (Seventh Sense AI), Mojtaba Bisheh-Niasar and Douglas Stebila (University of Waterloo). We especially want to recognize the contributions of Dr. Britta Hale who has helped immensely with strengthening the signature combiner construction, and with analyzing the scheme with respect to EUF-CMA and Non-Separability properties. Thanks to Giacomo Pope (github.com/GiacomoPope) whose ML-DSA and ML- KEM implementations were used to generate the test vectors. We are grateful to all who have given feedback over the years, formally or informally, on mailing lists or in person, including any contributors who may have been inadvertently omitted from this list. Finally, we wish to thank the authors of all the referenced documents upon which this specification was built. "Copying always makes things easier and less error prone" - [RFC8411]. Authors' Addresses Mike Ounsworth Entrust Limited 2500 Solandt Road – Suite 100 Ottawa, Ontario K2K 3G5 Canada Email: mike.ounsworth@entrust.com John Gray Entrust Limited 2500 Solandt Road – Suite 100 Ottawa, Ontario K2K 3G5 Canada Email: john.gray@entrust.com Massimiliano Pala OpenCA Labs New York City, New York, United States of America Email: director@openca.org Ounsworth, et al. Expires 20 December 2025 [Page 189] Internet-Draft Composite ML-DSA June 2025 Jan Klaussner Bundesdruckerei GmbH Kommandantenstr. 18 10969 Berlin Germany Email: jan.klaussner@bdr.de Scott Fluhrer Cisco Systems Email: sfluhrer@cisco.com Ounsworth, et al. Expires 20 December 2025 [Page 190]