LAMPS M. Ounsworth Internet-Draft J. Gray Intended status: Standards Track Entrust Expires: 13 April 2026 M. Pala OpenCA Labs J. Klaussner Bundesdruckerei GmbH S. Fluhrer Cisco Systems 10 October 2025 Composite ML-DSA for use in X.509 Public Key Infrastructure draft-ietf-lamps-pq-composite-sigs-11 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 13 April 2026 [Page 1] Internet-Draft Composite ML-DSA October 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 13 April 2026. 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 since -07 (WGLC) . . . . . . . . . . . . . . . . . . 3 2. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 5 2.1. Conventions and Terminology . . . . . . . . . . . . . . . 7 2.2. Composite Design Philosophy . . . . . . . . . . . . . . . 8 3. Overview of the Composite ML-DSA Signature Scheme . . . . . . 9 3.1. Pre-hashing . . . . . . . . . . . . . . . . . . . . . . . 10 3.2. Prefix, Label and CTX . . . . . . . . . . . . . . . . . . 11 4. Composite ML-DSA Functions . . . . . . . . . . . . . . . . . 12 4.1. Key Generation . . . . . . . . . . . . . . . . . . . . . 12 4.2. Sign . . . . . . . . . . . . . . . . . . . . . . . . . . 14 4.3. Verify . . . . . . . . . . . . . . . . . . . . . . . . . 16 5. Serialization . . . . . . . . . . . . . . . . . . . . . . . . 19 5.1. SerializePublicKey and DeserializePublicKey . . . . . . . 20 5.2. SerializePrivateKey and DeserializePrivateKey . . . . . . 23 5.3. SerializeSignatureValue and DeserializeSignatureValue . . 24 6. Use within X.509 and PKIX . . . . . . . . . . . . . . . . . . 27 6.1. Encoding to DER . . . . . . . . . . . . . . . . . . . . . 27 6.2. Key Usage Bits . . . . . . . . . . . . . . . . . . . . . 27 6.3. ASN.1 Definitions . . . . . . . . . . . . . . . . . . . . 28 7. Algorithm Identifiers and Parameters . . . . . . . . . . . . 30 Ounsworth, et al. Expires 13 April 2026 [Page 2] Internet-Draft Composite ML-DSA October 2025 7.1. RSASSA-PSS Parameters . . . . . . . . . . . . . . . . . . 37 7.2. Rationale for choices . . . . . . . . . . . . . . . . . . 38 8. ASN.1 Module . . . . . . . . . . . . . . . . . . . . . . . . 39 9. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 46 9.1. Object Identifier Allocations . . . . . . . . . . . . . . 46 9.1.1. Module Registration . . . . . . . . . . . . . . . . . 46 9.1.2. Object Identifier Registrations . . . . . . . . . . . 46 10. Security Considerations . . . . . . . . . . . . . . . . . . . 49 10.1. Why Hybrids? . . . . . . . . . . . . . . . . . . . . . . 50 10.2. EUF-CMA, SUF-CMA and non-separability . . . . . . . . . 50 10.2.1. EUF-CMA . . . . . . . . . . . . . . . . . . . . . . 51 10.2.2. SUF-CMA . . . . . . . . . . . . . . . . . . . . . . 52 10.2.3. Non-separability . . . . . . . . . . . . . . . . . . 52 10.3. Key Reuse . . . . . . . . . . . . . . . . . . . . . . . 53 10.4. Use of Prefix for attack mitigation . . . . . . . . . . 54 10.5. Policy for Deprecated and Acceptable Algorithms . . . . 55 11. Implementation Considerations . . . . . . . . . . . . . . . . 55 11.1. FIPS certification . . . . . . . . . . . . . . . . . . . 55 11.2. Backwards Compatibility . . . . . . . . . . . . . . . . 56 11.3. Profiling down the number of options . . . . . . . . . . 57 11.4. External Pre-hashing . . . . . . . . . . . . . . . . . . 58 12. References . . . . . . . . . . . . . . . . . . . . . . . . . 59 12.1. Normative References . . . . . . . . . . . . . . . . . . 59 12.2. Informative References . . . . . . . . . . . . . . . . . 62 Appendix A. Maximum Key and Signature Sizes . . . . . . . . . . 64 Appendix B. Component Algorithm Reference . . . . . . . . . . . 66 Appendix C. Component AlgorithmIdentifiers for Public Keys and Signatures . . . . . . . . . . . . . . . . . . . . . . . 68 Appendix D. Message Representative Examples . . . . . . . . . . 76 Appendix E. Test Vectors . . . . . . . . . . . . . . . . . . . . 78 Appendix F. Intellectual Property Considerations . . . . . . . . 201 Appendix G. Contributors and Acknowledgements . . . . . . . . . 201 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 202 1. Changes since -07 (WGLC) Interop-affecting changes: * Removed the randomizer, reverting the signature combiner construction to be similar to the HashComposite construction from -05. * Fixed the ASN.1 module for the pk-CompositeSignature and sa- CompositeSignature to indicate no ASN.1 wrapping is used. This simply clarifies the intended encoding but could be an interop- affecting change for implementations that built encoders / decoders from the ASN.1 and ended up with a non-intended encoding. Ounsworth, et al. Expires 13 April 2026 [Page 3] Internet-Draft Composite ML-DSA October 2025 * Aligned the hash function used for the RSA component to the RSA key size (Thanks Dan!). * Changed the OID-based Domain Separators into HPKE-style signature label strings to match draft-irtf-cfrg-concrete-hybrid-kems-00. * Updated to new prototype OIDs since it is not binary compatible with the previous release. * Dan Van Geest correctly pointed out that in ECPrivateKey (RFC5915), the parameters are not optional. They have been added to the private keys in the test vectors. * The Ed25519 and Ed448 private keys had been wrapped in OCTET STRING to match CurvePrivateKey (RFC8410). This has been changed to 32/57 byte raw. Editorial changes: * Incorporated the feedback from IETF 123, clarifying the pubic, private key and signature encodings. * Many minor editorial fixes based on comments from the working group. * Adjusted the Security Considerations about EUF-CMA and Non- Separability to match the removal of the randomizer. * Clarified that the ECDSA public key is raw X9.62 with no OCTET STRING wrapping. Test vectors were already correct. A full review was performed of the encoding of each component: * ML-DSA: - pub key, priv key, sig value: Raw, according to FIPS 204. Test vectors appear to match. * RSA: - pub key: ASN.1 RSAPublicKey. Test vectors appear to match (manually inspected "id-MLDSA44-RSA2048-PSS-SHA256"). - priv key: RSAPrivateKey (CRT). Test vectors appear to match (manually inspected "id-MLDSA44-RSA2048-PSS-SHA256"). Ounsworth, et al. Expires 13 April 2026 [Page 4] Internet-Draft Composite ML-DSA October 2025 - sig value: length of sig for "id-MLDSA44-RSA2048-PSS-SHA256" and "id-MLDSA44-RSA2048-PKCS15-SHA256" verified to be 256 bytes, format hard to manually inspect. * ECDSA: Inspecting test vectors for "id-MLDSA44-ECDSA-P256-SHA256" - pub key: The wording of the pub key format in Section 2.2 of RFC5480 is extremely confusing in how it would apply outside of a SubjectPublicKeyInfo. The Composite author's interpretation was for it to be raw X9.62, which is what is already in the test vectors: verified to be raw X9.62 with a leading byte of 0x04 (uncompressed). Normative text in Section 5 is incorrect and has been changed. - priv key: This is the ASN.1 structure ECPrivateKey [RFC5915] as intended, however, as Dan Van Geest points out, the parameters field, while marked OPTIONAL is actually required by Section 3 of RFC5915. That means the private keys here are invalid. This has been corrected in the test vectors. - sig value: This is an ASN.1 Ecdsa-Sig-Value [RFC3279] as intended. * EdDSA: - pub key: 32 byte raw. - priv key: Had been wrapped in OCTET STRING to match CurvePrivateKey (RFC8410). This has been changed to 32/57 byte raw. - sig value: 64 byte raw. 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. Ounsworth, et al. Expires 13 April 2026 [Page 5] Internet-Draft Composite ML-DSA October 2025 Unlike previous migrations between cryptographic algorithms, this migration gives us the foresight that Traditional cryptographic algorithms will be broken in the future, with the Traditional algorithms remaining strong in the interim, the only uncertainty is around the timing. But there are also some novel challenges. 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 adversary 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 [RFC9794]. 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]. Another motivation for using PQ/T Hybrids is regulatory compliance; for example, in some situations it might be possible to add Post- Quantum, via a PQ/T Hybrid, to an already audited and compliant solution without invalidating the existing certification, whereas a full replacement of the Traditional cryptography would almost certainly incur regulatory and compliance delays. In other words, PQ/T Hybrids can allow for deploying Post-Quantum before the PQ modules and operational procedures are fully audited and certified. This, more than any other requirement, is what motivates the large number of algorithm combinations in this specification: the intention is to provide a stepping-stone off of which ever cryptographic algorithm(s) an organization might have deployed today. 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. 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 Ounsworth, et al. Expires 13 April 2026 [Page 6] Internet-Draft Composite ML-DSA October 2025 systems is not directly covered in this specification, but is the subject of Section 11.2. The idea of a composite was first presented in [Bindel2017]. 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 [RFC9794]. 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 [RFC9794]. *COMPONENT / PRIMITIVE*: The words "component" or "primitive" are used interchangeably to refer to an asymmetric 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". *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: * || represents concatenation of two byte arrays. * [:] represents byte array slicing. Ounsworth, et al. Expires 13 April 2026 [Page 7] Internet-Draft Composite ML-DSA October 2025 * (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 parameterized 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 [RFC9794] 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. In terms of security properties, Composite ML-DSA will be EUF-CMA secure if at least one of its component algorithms is EUF-CMA secure and the message hash PH is collision resistant. SUF-CMA security of Composite ML-DSA is more complicated. While some of the algorithm combinations defined in this specification are likely to be SUF-CMA secure against classical adversaries, none are SUF-CMA secure against Ounsworth, et al. Expires 13 April 2026 [Page 8] Internet-Draft Composite ML-DSA October 2025 a quantum adversary. This means that replacing an ML-DSA signature with a Composite ML-DSA signature could be considered a reduction in security if your application is sensitive to the difference between SUF-CMA and EUF-CMA security. Composite ML-DSA is NOT RECOMMENDED for use in applications requiring SUF-CMA security. Further discussion can be found in Section 10.2. 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 pre-hashing and prepends several signature label 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 match the API of a generic signature scheme, which consists 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 and are provided as internal functions for use by the public functions KeyGen(), Sign(), and Verify(). These algorithms are inspired by similar algorithms in [RFC9180]. Ounsworth, et al. Expires 13 April 2026 [Page 9] Internet-Draft Composite ML-DSA October 2025 * 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. * 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) -> (mldsaSeed, tradSK): Parse a byte string to recover the component private keys. * SerializeSignatureValue(mldsaSig, tradSig) -> bytes: Produce a byte string encoding of the component signature values. * DeserializeSignatureValue(bytes) -> (mldsaSig, tradSig): Parse a byte string to recover the component signature values. Full definitions of serialization and deserialization algorithms can be found in Section 5. 3.1. Pre-hashing 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. 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 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. Ounsworth, et al. Expires 13 April 2026 [Page 10] Internet-Draft Composite ML-DSA October 2025 See Section 11.4 for a discussion of externalizing the pre-hashing step. 3.2. Prefix, Label and CTX The to-be-signed message representative M' is created by concatenating several values, including the pre-hashed message. M' := Prefix || Label || len(ctx) || ctx || PH( M ) Prefix: A fixed octet string which is the byte encoding of the ASCII string "CompositeAlgorithmSignatures2025" which in hex is: 436F6D706F73697465416C676F726974686D5369676E61747572657332303235 See Section 10.4 for more information on the prefix. Label: A signature label which is specific to each composite algorithm. The signature label binds the signature to the specific composite algorithm. Signature label values for each algorithm are listed in Section 7. len(ctx): A single unsigned byte encoding the length of the context. ctx: The context bytes, which allows for applications to bind the signature to an application context. PH( M ): The hash of the message to be signed. Each Composite ML-DSA algorithm has a unique signature label 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 of X.509, or if the prohibition on reusing key material between a composite and a non-composite, or between two composites is not adhered to. 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 per-algorithm Label is used as the ctx for the underlying ML-DSA primitive. The EdDSA component primitive can also expose a ctx parameter, but this is not used by Composite ML-DSA. Ounsworth, et al. Expires 13 April 2026 [Page 11] Internet-Draft Composite ML-DSA October 2025 Within Composite ML-DSA, values of Label are fully specified, and runtime-variable Label values are not allowed. For authors of follow-on specifications that allow Label to be runtime-variable, it should be pre-fixed with the length, len(Label) || Label to prevent using this as an injection site that could enable various cryptographic attacks. 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. 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-threaded, multi-process, or multi-module applications might choose to execute the key generation functions in parallel for better key generation performance or architectural modularity. The following describes how to instantiate a KeyGen() function for a given composite algorithm represented by . Ounsworth, et al. Expires 13 April 2026 [Page 12] Internet-Draft Composite ML-DSA October 2025 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 "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, mldsaSK) = ML-DSA.KeyGen_internal(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) This keygen routine make use of the seed-based ML- DSA.KeyGen_internal(𝜉), which is defined in Algorithm 6 of [FIPS.204]. For FIPS-certification implications, see Section 11.1. Ounsworth, et al. Expires 13 April 2026 [Page 13] Internet-Draft Composite ML-DSA October 2025 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 10.3. Note that this keygen routine outputs a serialized composite key, which contains only the ML-DSA seed. Implementations should feel free to modify this routine to additionally output the expanded mldsaSK or to make free use of ML-DSA.KeyGen_internal(mldsaSeed) as needed to expand the ML-DSA seed into an expanded key prior to performing a signing operation. The above algorithm MAY be modified to expose an interface of Composite-ML-DSA.KeyGen(seed) if it is desirable to have a deterministic KeyGen that derives both component keys from a shared seed. Details of implementing this variation are not included in this document. 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_internal(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 of 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. Ounsworth, et al. Expires 13 April 2026 [Page 14] Internet-Draft Composite ML-DSA October 2025 The following describes how to instantiate a Sign() function for a given Composite ML-DSA algorithm represented by . See Section 3.1 for a discussion of the pre-hash function PH. See Section 3.2 for a discussion on the signature label Label and application context ctx. See Section 11.4 for a discussion of externalizing the pre-hashing step. 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 "ML-DSA-65". Trad The underlying traditional algorithm and parameter set, for example "sha256WithRSAEncryption" or "Ed25519". Prefix The prefix octet string. Label A signature label which is specific to each composite algorithm. Additionally, the composite label is passed into the underlying ML-DSA primitive as the ctx. Signature Label values are defined in the "Signature Label Values" section below. PH The function used to pre-hash M. Output: s The composite signature value. Signature Generation Process: 1. If len(ctx) > 255: return error Ounsworth, et al. Expires 13 April 2026 [Page 15] Internet-Draft Composite ML-DSA October 2025 2. Compute the Message representative M'. As in FIPS 204, len(ctx) is encoded as a single unsigned byte. M' := Prefix || Label || len(ctx) || ctx || 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_internal(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=Label ) 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(mldsaSig, tradSig) return 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. 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. Ounsworth, et al. Expires 13 April 2026 [Page 16] Internet-Draft Composite ML-DSA October 2025 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 . See Section 3.1 for a discussion of the pre-hash function PH. See Section 3.2 for a discussion on the signature label Label and application context ctx. See Section 11.4 for a discussion of externalizing the pre-hashing step. 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 "ML-DSA-65". Trad The underlying traditional algorithm and parameter set, for example "sha256WithRSAEncryption" or "Ed25519". Prefix The prefix octet string. Label A signature label which is specific to each composite algorithm. Additionally, the composite label is passed into the underlying ML-DSA primitive as the ctx. Signature Label values are defined in the "Signature Label Values" section below. PH The function used to pre-hash M. Output: Validity (bool) "Valid signature" (true) if the composite Ounsworth, et al. Expires 13 April 2026 [Page 17] Internet-Draft Composite ML-DSA October 2025 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) (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 || Label || len(ctx) || ctx || 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=Label ) then output "Invalid signature" if not Trad.Verify( tradPK, M', tradSig ) then output "Invalid signature" if all succeeded, then output "Valid signature" 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. Ounsworth, et al. Expires 13 April 2026 [Page 18] Internet-Draft Composite ML-DSA October 2025 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 details 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 Sizes While ML-DSA has a single fixed-size representation for each of public key, private key (seed), and signature, a traditional component algorithm might allow multiple valid encodings. For example, a stand-alone RSA private key can be encoded in Chinese Remainder Theorem form. In order to obtain interoperability, composite algorithms MUST use the following encodings of the underlying components: * *ML-DSA*: MUST be encoded as specified in section 7.2 of [FIPS.204], using a 32-byte seed as the private key. The signature and public key format are encoded as specified in section 7.2 of [FIPS.204]. * *RSA*: the public key MUST be encoded as RSAPublicKey with the (n,e) public key representation as specified in A.1.1 of [RFC8017] and the private key representation as RSAPrivateKey specified in A.1.2 of [RFC8017] with version 0 and 'otherPrimeInfos' absent. An RSA signature MUST be encoded as specified in section 8.1.1 (for RSASSA-PSS-SIGN) or 8.2.1 (for RSASSA-PCKS1-V1_5-SIGN) of [RFC8017]. Ounsworth, et al. Expires 13 April 2026 [Page 19] Internet-Draft Composite ML-DSA October 2025 * *ECDSA*: public key MUST be encoded as an uncompressed X9.62 [X9.62_2005], including the leading byte 0x04 indicating uncompressed. This is consistent with the encoding of ECPoint as specified in section 2.2 of [RFC5480] when no ASN.1 OCTET STRING wrapping is present. A signature MUST be encoded as an Ecdsa-Sig- Value as specified in section 2.2.3 of [RFC3279]. The private key MUST be encoded as ECPrivateKey specified in [RFC5915] without 'NamedCurve' parameter and without 'publicKey' field. * *EdDSA*: public key and signature MUST be encoded as per section 3 of [RFC8032] and the private key is a 32 or 57 byte raw value for Ed25519 and Ed448 respectively, which can be converted to a CurvePrivateKey specified in [RFC8410] by the addition of an OCTET STRING wrapper. All ASN.1 objects SHALL be encoded using DER on serialization. For all serialization routines below, when their output values are required to be carried in an ASN.1 structure, they are wrapped as described in Section 6.1. Even with fixed encodings for the traditional component, there might be slight differences in size of the encoded value due to, for example, encoding rules that drop leading zeroes. See Appendix A for a table of maximum sizes for each composite algorithm and further discussion of the reason for variations in these sizes. 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 13 April 2026 [Page 20] Internet-Draft Composite ML-DSA October 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 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 13 April 2026 [Page 21] Internet-Draft Composite ML-DSA October 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 "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) Ounsworth, et al. Expires 13 April 2026 [Page 22] Internet-Draft Composite ML-DSA October 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 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 parameterized. Ounsworth, et al. Expires 13 April 2026 [Page 23] Internet-Draft Composite ML-DSA October 2025 Composite-ML-DSA.DeserializePrivateKey(bytes) -> (mldsaSeed, tradSK) Explicit inputs: bytes An encoded composite private key. Implicit inputs: None 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. 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) 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 13 April 2026 [Page 24] Internet-Draft Composite ML-DSA October 2025 Composite-ML-DSA.SerializeSignatureValue(mldsaSig, tradSig) -> bytes Explicit inputs: 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 mldsaSig || tradSig 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 . Ounsworth, et al. Expires 13 April 2026 [Page 25] Internet-Draft Composite ML-DSA October 2025 Composite-ML-DSA.DeserializeSignatureValue(bytes) -> (mldsaSig, tradSig) Explicit inputs: bytes An encoded composite signature value. Implicit inputs mapped from : ML-DSA The underlying ML-DSA algorithm and parameter set, for example "ML-DSA-65". Output: 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 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 = bytes[:2420] tradSig = bytes[2420:] case ML-DSA-65: mldsaSig = bytes[:3309] tradSig = bytes[3309:] case ML-DSA-87: mldsaSig = bytes[:4627] tradSig = bytes[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 (mldsaSig, tradSig) Ounsworth, et al. Expires 13 April 2026 [Page 26] Internet-Draft Composite ML-DSA October 2025 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. 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- encoded message format such as an X.509's subjectPublicKey and signatureValue BIT STRING [RFC5280] or a OneAsymmetricKey.privateKey OCTET STRING [RFC5958], then the BIT STRING or OCTET STRING contains this raw byte string encoding of the public key. When a Composite ML-DSA public key appears outside of a SubjectPublicKeyInfo type in an environment that uses ASN.1 encoding, it could be encoded as an OCTET STRING by using the Composite-ML-DSA- PublicKey type defined below. Composite-ML-DSA-PublicKey ::= OCTET STRING Size constraints MAY be enforced, as appropriate as per Appendix A. 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: Ounsworth, et al. Expires 13 April 2026 [Page 27] Internet-Draft Composite ML-DSA October 2025 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: digitalSignature; nonRepudiation; and cRLSign. 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 defined to allow for compact definitions of each composite algorithm, leading to a smaller overall ASN.1 module. Ounsworth, et al. Expires 13 April 2026 [Page 28] Internet-Draft Composite ML-DSA October 2025 pk-CompositeSignature {OBJECT IDENTIFIER:id} PUBLIC-KEY ::= { IDENTIFIER id -- KEY no ASN.1 wrapping -- PARAMS ARE absent CERT-KEY-USAGE { digitalSignature, nonRepudiation, keyCertSign, cRLSign} -- PRIVATE-KEY no ASN.1 wrapping -- } sa-CompositeSignature{OBJECT IDENTIFIER:id, PUBLIC-KEY:publicKeyType } SIGNATURE-ALGORITHM ::= { IDENTIFIER id -- VALUE no ASN.1 wrapping -- PARAMS ARE absent PUBLIC-KEYS {publicKeyType} } Figure 1: 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: 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: Ounsworth, et al. Expires 13 April 2026 [Page 29] Internet-Draft Composite ML-DSA October 2025 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 2: 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 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 10.3. 7. Algorithm Identifiers and Parameters This section lists the algorithm identifiers and parameters for all Composite ML-DSA algorithms. Full specifications for the referenced algorithms can be found in Appendix B. Ounsworth, et al. Expires 13 April 2026 [Page 30] Internet-Draft Composite ML-DSA October 2025 As the number of algorithms can be daunting, implementers who wish to implement only a single composite algorithm should see Section 11.3 for a discussion of the best algorithm for the most common use cases. Labels are represented here as ASCII strings, but implementers MUST convert them to byte strings using the obvious ASCII conversions prior to concatenating them with other byte values as described in Section 3.2. EDNOTE: the OIDs listed below are prototyping OIDs defined in Entrust's 2.16.840.1.114027.80.9.1 arc but will be replaced by IANA. * id-MLDSA44-RSA2048-PSS-SHA256 - OID: 2.16.840.1.114027.80.9.1.20 - Label: COMPSIG-MLDSA44-RSA2048-PSS-SHA256 - Pre-Hash function (PH): SHA256 - ML-DSA variant: ML-DSA-44 - Traditional Algorithm: RSA o Traditional Signature Algorithm: id-RSASSA-PSS o RSA size: 2048 o RSASSA-PSS parameters: See Table 2 * id-MLDSA44-RSA2048-PKCS15-SHA256 - OID: 2.16.840.1.114027.80.9.1.21 - Label: COMPSIG-MLDSA44-RSA2048-PKCS15-SHA256 - Pre-Hash function (PH): SHA256 - ML-DSA variant: ML-DSA-44 - Traditional Algorithm: RSA o Traditional Signature Algorithm: sha256WithRSAEncryption o RSA size: 2048 * id-MLDSA44-Ed25519-SHA512 Ounsworth, et al. Expires 13 April 2026 [Page 31] Internet-Draft Composite ML-DSA October 2025 - OID: 2.16.840.1.114027.80.9.1.22 - Label: COMPSIG-MLDSA44-Ed25519-SHA512 - Pre-Hash function (PH): SHA512 - ML-DSA variant: ML-DSA-44 - Traditional Algorithm: Ed25519 o Traditional Signature Algorithm: id-Ed25519 * id-MLDSA44-ECDSA-P256-SHA256 - OID: 2.16.840.1.114027.80.9.1.23 - Label: COMPSIG-MLDSA44-ECDSA-P256-SHA256 - Pre-Hash function (PH): SHA256 - ML-DSA variant: ML-DSA-44 - Traditional Algorithm: ECDSA o Traditional Signature Algorithm: ecdsa-with-SHA256 o ECDSA curve: secp256r1 * id-MLDSA65-RSA3072-PSS-SHA512 - OID: 2.16.840.1.114027.80.9.1.24 - Label: COMPSIG-MLDSA65-RSA3072-PSS-SHA512 - Pre-Hash function (PH): SHA512 - ML-DSA variant: ML-DSA-65 - Traditional Algorithm: RSA o Traditional Signature Algorithm: id-RSASSA-PSS o RSA size: 3072 o RSASSA-PSS parameters: See Table 2 * id-MLDSA65-RSA3072-PKCS15-SHA512 Ounsworth, et al. Expires 13 April 2026 [Page 32] Internet-Draft Composite ML-DSA October 2025 - OID: 2.16.840.1.114027.80.9.1.25 - Label: COMPSIG-MLDSA65-RSA3072-PKCS15-SHA512 - Pre-Hash function (PH): SHA512 - ML-DSA variant: ML-DSA-65 - Traditional Algorithm: RSA o Traditional Signature Algorithm: sha256WithRSAEncryption o RSA size: 3072 * id-MLDSA65-RSA4096-PSS-SHA512 - OID: 2.16.840.1.114027.80.9.1.26 - Label: COMPSIG-MLDSA65-RSA4096-PSS-SHA512 - Pre-Hash function (PH): SHA512 - ML-DSA variant: ML-DSA-65 - Traditional Algorithm: RSA o Traditional Signature Algorithm: id-RSASSA-PSS o RSA size: 4096 o RSASSA-PSS parameters: See Table 3 * id-MLDSA65-RSA4096-PKCS15-SHA512 - OID: 2.16.840.1.114027.80.9.1.27 - Label: COMPSIG-MLDSA65-RSA4096-PKCS15-SHA512 - Pre-Hash function (PH): SHA512 - ML-DSA variant: ML-DSA-65 - Traditional Algorithm: RSA o Traditional Signature Algorithm: sha384WithRSAEncryption o RSA size: 4096 Ounsworth, et al. Expires 13 April 2026 [Page 33] Internet-Draft Composite ML-DSA October 2025 * id-MLDSA65-ECDSA-P256-SHA512 - OID: 2.16.840.1.114027.80.9.1.28 - Label: COMPSIG-MLDSA65-P256-SHA512 - Pre-Hash function (PH): SHA512 - ML-DSA variant: ML-DSA-65 - Traditional Algorithm: ECDSA o Traditional Signature Algorithm: ecdsa-with-SHA256 o ECDSA curve: secp256r1 * id-MLDSA65-ECDSA-P384-SHA512 - OID: 2.16.840.1.114027.80.9.1.29 - Label: COMPSIG-MLDSA65-P384-SHA512 - Pre-Hash function (PH): SHA512 - ML-DSA variant: ML-DSA-65 - Traditional Algorithm: ECDSA o Traditional Signature Algorithm: ecdsa-with-SHA384 o ECDSA curve: secp384r1 * id-MLDSA65-ECDSA-brainpoolP256r1-SHA512 - OID: 2.16.840.1.114027.80.9.1.30 - Label: COMPSIG-MLDSA65-BP256-SHA512 - Pre-Hash function (PH): SHA512 - ML-DSA variant: ML-DSA-65 - Traditional Algorithm: ECDSA o Traditional Signature Algorithm: ecdsa-with-SHA256 o ECDSA curve: brainpoolP256r1 Ounsworth, et al. Expires 13 April 2026 [Page 34] Internet-Draft Composite ML-DSA October 2025 * id-MLDSA65-Ed25519-SHA512 - OID: 2.16.840.1.114027.80.9.1.31 - Label: COMPSIG-MLDSA65-Ed25519-SHA512 - Pre-Hash function (PH): SHA512 - ML-DSA variant: ML-DSA-65 - Traditional Algorithm: Ed25519 o Traditional Signature Algorithm: id-Ed25519 * id-MLDSA87-ECDSA-P384-SHA512 - OID: 2.16.840.1.114027.80.9.1.32 - Label: COMPSIG-MLDSA87-P384-SHA512 - Pre-Hash function (PH): SHA512 - ML-DSA variant: ML-DSA-87 - Traditional Algorithm: ECDSA o Traditional Signature Algorithm: ecdsa-with-SHA384 o ECDSA curve: secp384r1 * id-MLDSA87-ECDSA-brainpoolP384r1-SHA512 - OID: 2.16.840.1.114027.80.9.1.33 - Label: COMPSIG-MLDSA87-BP384-SHA512 - Pre-Hash function (PH): SHA512 - ML-DSA variant: ML-DSA-87 - Traditional Algorithm: ECDSA o Traditional Signature Algorithm: ecdsa-with-SHA384 o ECDSA curve: brainpoolP384r1 * id-MLDSA87-Ed448-SHAKE256 Ounsworth, et al. Expires 13 April 2026 [Page 35] Internet-Draft Composite ML-DSA October 2025 - OID: 2.16.840.1.114027.80.9.1.34 - Label: COMPSIG-MLDSA87-Ed448-SHAKE256 - Pre-Hash function (PH): SHAKE256/64** - ML-DSA variant: ML-DSA-87 - Traditional Algorithm: Ed448 o Traditional Signature Algorithm: id-Ed448 * id-MLDSA87-RSA3072-PSS-SHA512 - OID: 2.16.840.1.114027.80.9.1.35 - Label: COMPSIG-MLDSA87-RSA3072-PSS-SHA512 - Pre-Hash function (PH): SHA512 - ML-DSA variant: ML-DSA-87 - Traditional Algorithm: RSA o Traditional Signature Algorithm: id-RSASSA-PSS o RSA size: 3072 o RSASSA-PSS parameters: See Table 2 * id-MLDSA87-RSA4096-PSS-SHA512 - OID: 2.16.840.1.114027.80.9.1.36 - Label: COMPSIG-MLDSA87-RSA4096-PSS-SHA512 - Pre-Hash function (PH): SHA512 - ML-DSA variant: ML-DSA-87 - Traditional Algorithm: RSA o Traditional Signature Algorithm: id-RSASSA-PSS o RSA size: 4096 o RSASSA-PSS parameters: See Table 3 Ounsworth, et al. Expires 13 April 2026 [Page 36] Internet-Draft Composite ML-DSA October 2025 * id-MLDSA87-ECDSA-P521-SHA512 - OID: 2.16.840.1.114027.80.9.1.37 - Label: COMPSIG-MLDSA87-P521-SHA512 - Pre-Hash function (PH): SHA512 - ML-DSA variant: ML-DSA-87 - Traditional Algorithm: ECDSA o Traditional Signature Algorithm: ecdsa-with-SHA512 o ECDSA curve: secp521r1 For all RSA key types and sizes, the exponent is RECOMMENDED to be 65537. Implementations MAY support only 65537 and reject other exponent values. Legacy RSA implementations that use other values for the exponent MAY be used within a composite, but need to be careful when interoperating with other implementations. **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. 7.1. RSASSA-PSS Parameters Use of RSASSA-PSS [RFC8017] requires extra parameters to be specified. The RSASSA-PSS-params ASN.1 type defined in [RFC8017] is not used in Composite ML-DSA encodings since the parameter values are fixed by this specification. However, below refer to the named fields of the RSASSA-PSS-params ASN.1 type in order to provide a mapping between the use of RSASSA-PSS in Composite ML-DSA and [RFC8017] When RSA-PSS is used at the 2048-bit or 3072-bit security level, RSASSA-PSS SHALL be instantiated with the following parameters: Ounsworth, et al. Expires 13 April 2026 [Page 37] Internet-Draft Composite ML-DSA October 2025 +=============================+===========+ | RSASSA-PSS-params field | Value | +=============================+===========+ | hashAlgorithm | id-sha256 | +-----------------------------+-----------+ | maskGenAlgorithm.algorithm | id-mgf1 | +-----------------------------+-----------+ | maskGenAlgorithm.parameters | id-sha256 | +-----------------------------+-----------+ | saltLength | 32 | +-----------------------------+-----------+ | trailerField | 1 | +-----------------------------+-----------+ Table 2: RSASSA-PSS 2048 and 3072 Parameters When RSA-PSS is used at the 4096-bit security level, RSASSA-PSS SHALL be instantiated with the following parameters: +=============================+===========+ | RSASSA-PSS-params field | Value | +=============================+===========+ | hashAlgorithm | id-sha384 | +-----------------------------+-----------+ | maskGenAlgorithm.algorithm | id-mgf1 | +-----------------------------+-----------+ | maskGenAlgorithm.parameters | id-sha384 | +-----------------------------+-----------+ | saltLength | 48 | +-----------------------------+-----------+ | trailerField | 1 | +-----------------------------+-----------+ Table 3: RSASSA-PSS 4096 Parameters 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 Ounsworth, et al. Expires 13 April 2026 [Page 38] Internet-Draft Composite ML-DSA October 2025 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 adversaries and "qubits of security" against quantum adversaries. 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. 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; 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) } ; -- Ounsworth, et al. Expires 13 April 2026 [Page 39] Internet-Draft Composite ML-DSA October 2025 -- Object Identifiers -- -- -- Information Object Classes -- pk-CompositeSignature {OBJECT IDENTIFIER:id} PUBLIC-KEY ::= { IDENTIFIER id -- KEY no ASN.1 wrapping -- PARAMS ARE absent CERT-KEY-USAGE { digitalSignature, nonRepudiation, keyCertSign, cRLSign} -- PRIVATE-KEY no ASN.1 wrapping -- } sa-CompositeSignature{OBJECT IDENTIFIER:id, PUBLIC-KEY:publicKeyType } SIGNATURE-ALGORITHM ::= { IDENTIFIER id -- VALUE no ASN.1 wrapping -- 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) 20 } 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, 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) 21 } pk-MLDSA44-RSA2048-PKCS15-SHA256 PUBLIC-KEY ::= Ounsworth, et al. Expires 13 April 2026 [Page 40] Internet-Draft Composite ML-DSA October 2025 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) 22 } 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) 23 } 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) 24 } 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 } Ounsworth, et al. Expires 13 April 2026 [Page 41] Internet-Draft Composite ML-DSA October 2025 -- 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) 25 } 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) 26 } 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) 27 } 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 } -- 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) 28 } pk-MLDSA65-ECDSA-P256-SHA512 PUBLIC-KEY ::= pk-CompositeSignature{ id-MLDSA65-ECDSA-P256-SHA512} Ounsworth, et al. Expires 13 April 2026 [Page 42] Internet-Draft Composite ML-DSA October 2025 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) 29 } 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) 30 } 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) 31 } pk-MLDSA65-Ed25519-SHA512 PUBLIC-KEY ::= pk-CompositeSignature{ id-MLDSA65-Ed25519-SHA512} sa-MLDSA65-Ed25519-SHA512 SIGNATURE-ALGORITHM ::= sa-CompositeSignature{ id-MLDSA65-Ed25519-SHA512, pk-MLDSA65-Ed25519-SHA512 } Ounsworth, et al. Expires 13 April 2026 [Page 43] Internet-Draft Composite ML-DSA October 2025 -- 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) 32 } 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) 33 } 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) 34 } 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 } -- 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) 35 } pk-MLDSA87-RSA3072-PSS-SHA512 PUBLIC-KEY ::= Ounsworth, et al. Expires 13 April 2026 [Page 44] Internet-Draft Composite ML-DSA October 2025 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) 36 } 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) 37 } 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 | 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 | Ounsworth, et al. Expires 13 April 2026 [Page 45] Internet-Draft Composite ML-DSA October 2025 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 assign an object identifier (OID) for the module identifier (TBDMOD) with a Description of "id-mod-composite-mldsa- 2025". The OID for the module should be allocated in the "SMI Security for PKIX Module Identifier" registry (1.3.6.1.5.5.7.0). IANA is also requested to allocate values from the "SMI Security for PKIX Algorithms" registry (1.3.6.1.5.5.7.6) 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 Section 7. 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": * id-MLDSA44-RSA2048-PSS-SHA256 Ounsworth, et al. Expires 13 April 2026 [Page 46] Internet-Draft Composite ML-DSA October 2025 - 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 * id-MLDSA65-RSA4096-PSS-SHA512 Ounsworth, et al. Expires 13 April 2026 [Page 47] Internet-Draft Composite ML-DSA October 2025 - 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 * id-MLDSA87-ECDSA-P384-SHA512 Ounsworth, et al. Expires 13 April 2026 [Page 48] Internet-Draft Composite ML-DSA October 2025 - 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 10. Security Considerations Ounsworth, et al. Expires 13 April 2026 [Page 49] Internet-Draft Composite ML-DSA October 2025 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 adversary 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 adversary 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, and also in the fact that the composite public key could be trusted by the verifier while the component keys in isolation are not, thus requiring the adversary to forge a whole composite signature. *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. EUF-CMA, SUF-CMA and non-separability First, a note about the security model under which this analysis is performed. This specification strictly forbids re-using component key material between composite and non-composite keys, or between multiple composite keys. This specification also exists within the X.509 PKI architecture where trust in a public verification key is assumed to be established either directly via a trust store or via a Ounsworth, et al. Expires 13 April 2026 [Page 50] Internet-Draft Composite ML-DSA October 2025 certificate chain. That said, these are both policy mechanisms that are outside the formal definitions of EUF-CMA and SUF-CMA under which a signature primitive must be analysed, therefore this section considers attacks that may be mitigated partially or completely within a strictly-implemented PKI setting, but which need to be considered when considering Composite ML-DSA as a general-purpose signature primitive that could be used outside of the X.509 setting. The second securtiy model considiration is that composites are designed to provide value even if one algorithm is broken, even if you do not know which. However, the security properties offered by the composite signature can differ based on which algorithm you consider to be broken. 10.2.1. EUF-CMA A signature algorithm is Existentially Unforgeable under Chosen- Message Attack (EUF-CMA) if an adversary that has access to a signing oracle cannot create a message-signature pair (M, Sig) that would be accepted by the verifier for any message M that was not an input to a signing oracle query. In general, Composite ML-DSA will be EUF-CMA secure if at least one of the component algorithms is EUF-CMA secure and PH is collision resistant. Any algorithm that creates an existential forgery (M, (mldsaSig, tradSig)) for Composite ML-DSA can be converted into a pair of algorithms that will either create existential forgeries (M', mldsaSig) and (M', tradSig) for the component algorithms or a collision in PH. However, the nature of the EUF-CMA security guarantee can still change if one of the component algorithms is broken: * If the traditional component is broken, then Composite ML-DSA will remain EUF-CMA secure against quantum adversaries. * If ML-DSA is broken, then Composite ML-DSA will only be EUF-CMA secure against classical adversaries. The same properties will hold for X.509 certificates that use Composite ML-DSA: a classical adversary cannot forge a Composite ML- DSA signed certificate if at least one component algorithm is classically EUF-CMA secure, and a quantum adversary cannot forge a Composite ML-DSA signed certificate if ML-DSA remains quantumly EUF- CMA secure. Ounsworth, et al. Expires 13 April 2026 [Page 51] Internet-Draft Composite ML-DSA October 2025 10.2.2. SUF-CMA A signature algorithm is Strongly Unforgeable under Chosen-Message Attack (SUF-CMA) if an adversary that has access to a signing oracle cannot create a message-signature pair (M, Sig) that was not an output of a signing oracle query. This is a stronger property than EUF-CMA since the message M does not need to be different. SUF-CMA security is also more complicated for Composite ML-DSA than EUF-CMA. A SUF-CMA failure in one component algorithm can lead to a SUF-CMA failure in the composite. For example, an ECDSA signature can be trivially modified to produce a different signature that is still valid for the same message and this property passes directly through to Composite ML-DSA with ECDSA. Unfortunately, it is not generally sufficient for both component algorithms to be SUF-CMA secure. If repeated calls to the signing oracle produce two valid message-signature pairs (M, (mldsaSig1, tradSig1)) and (M, (mldsaSig2, tradSig2)) for the same message M, but where mldsaSig1 =/= mldsaSig2 and tradSig1 =/= tradSig2, then the adversary can construct a third pair (M, (mldsaSig1, tradSig2)) that will also be valid. Note that this SUF-CMA failure does not apply to the situation where Composite ML-DSA is used to sign X.509 certificates. Repeated calls to a certificate signing oracle will produce certificates with different serial numbers and so mixing the component signatures does not give a valid composite signature in the same way. Nevertheless, Composite ML-DSA will not be SUF-CMA secure, and Composite ML-DSA signed X.509 certificates will not be strongly unforgeable, against quantum adversaries since a quantum adversary will be able to break the SUF-CMA security of the traditional component. Consequently, applications where SUF-CMA security is critical SHOULD NOT use Composite ML-DSA. 10.2.3. Non-separability Weak Non-Separability (WNS) of a hybrid signature is defined in [I-D.ietf-pquip-hybrid-signature-spectrums] as the guarantee that an adversary cannot simply "remove" one of the component signatures without evidence left behind. Ounsworth, et al. Expires 13 April 2026 [Page 52] Internet-Draft Composite ML-DSA October 2025 Strong Non-Separability (SNS) is the stronger notion that an adversary cannot take a hybrid signature and produce a component signature, with a potentially different message, that will be accepted by the component verifier. Composite ML-DSA signs a message M by passing M' as defined in Section 3.2 to the component signature primitives. Consider an adversary that takes a composite signature (M, (mldsaSig, tradSig)) and splits it into the component signatures (M', mldsaSig) and (M', tradSig). On the traditional side, (M', tradSig) will verify correctly, but the static Prefix defined in Section 3.2 remains as evidence of the original composite. On the ML-DSA side, (M', mldsaSig) is signed with ML-DSA's context value equal to the composite algorithm's Label so will fail to verify under ML- DSA.Verify(M', ctx=""). Consequently, Composite ML-DSA will provide WNS for both components and a limited form of SNS for the ML-DSA component. It can achieve stronger non-separability in practice for both components if the prefix-based mitigation described in Section 10.4 is applied. When used within X.509, the OID of the signature algorithm is included in the signed object so if one of the component signatures is removed from the Composite ML-DSA signature then the signed-over OID will still indicate the composite algorithm, and this will fail at the X.509 processing layer. Composite ML-DSA therefore provides a version of SNS for X.509. The prohibition on key reuse between composite and single-algorithm contexts discussed in Section 10.3 further strengthens the non-separability in practice. 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. 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 Ounsworth, et al. Expires 13 April 2026 [Page 53] Internet-Draft Composite ML-DSA October 2025 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. 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. Ounsworth, et al. Expires 13 April 2026 [Page 54] Internet-Draft Composite ML-DSA October 2025 10.5. 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. 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_internal(seed) which might not be available in a cryptographic module running in FIPS- Ounsworth, et al. Expires 13 April 2026 [Page 55] Internet-Draft Composite ML-DSA October 2025 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. However, using an interface which doesn't support a seed will prevent the implementation from encoding the private key according to Section 5.2. Another example is pre- hashing; a pre-hash is inherent to RSA, ECDSA, and ML-DSA (μ), 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. Note also that also that Section 4.1 depicts the generation of the seed as mldsaSeed = Random(), when implementing this for FIPS certification, this MUST be the direct output of a FIPS-approved DRBG. 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 document 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. Ounsworth, et al. Expires 13 April 2026 [Page 56] Internet-Draft Composite ML-DSA October 2025 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. 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 as it provides the best overall balance of performance and security. id-MLDSA65-ECDSA-P256-SHA512 Below we list a few other recommendations for specific scenarios. In applications that require RSA, it is RECOMMENDED to focus implementation effort on: id-MLDSA65-RSA3072-PSS-SHA512 In applications that are performance and bandwidth-sensitive, it is RECOMMENDED to focus implementation effort on: id-MLDSA44-ECDSA-P256-SHA256 or id-MLDSA44-Ed25519-SHA512 In applications that only allow NIST PQC Level 5, it is RECOMMENDED to focus implementation effort on: id-MLDSA87-ECDSA-P384-SHA512 Ounsworth, et al. Expires 13 April 2026 [Page 57] Internet-Draft Composite ML-DSA October 2025 In applications that require the signature primitive to provide SUF- CMA, it is RECOMMENDED to focus implementation effort on: id-MLDSA65-Ed25519-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. 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 Ounsworth, et al. Expires 13 April 2026 [Page 58] Internet-Draft Composite ML-DSA October 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 "ML-DSA-65". Trad The underlying traditional algorithm and parameter set, for example "sha256WithRSAEncryption" or "Ed25519". Prefix The prefix octet string. Label A signature label which is specific to each composite algorithm. Additionally, the composite label is passed into the underlying ML-DSA primitive as the ctx. Signature Label values are defined in the "Signature Label Values" 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. 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 13 April 2026 [Page 59] Internet-Draft Composite ML-DSA October 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, . [RFC3279] Bassham, L., Polk, W., and R. Housley, "Algorithms and Identifiers for the Internet X.509 Public Key Infrastructure Certificate and Certificate Revocation List (CRL) Profile", RFC 3279, DOI 10.17487/RFC3279, April 2002, . [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, . Ounsworth, et al. Expires 13 April 2026 [Page 60] Internet-Draft Composite ML-DSA October 2025 [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, . [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, . [RFC5915] Turner, S. and D. Brown, "Elliptic Curve Private Key Structure", RFC 5915, DOI 10.17487/RFC5915, June 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, . [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, . [RFC8032] Josefsson, S. and I. Liusvaara, "Edwards-Curve Digital Signature Algorithm (EdDSA)", RFC 8032, DOI 10.17487/RFC8032, January 2017, . Ounsworth, et al. Expires 13 April 2026 [Page 61] Internet-Draft Composite ML-DSA October 2025 [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, . [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, . Ounsworth, et al. Expires 13 April 2026 [Page 62] Internet-Draft Composite ML-DSA October 2025 [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., . [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, . [RFC5914] Housley, R., Ashmore, S., and C. Wallace, "Trust Anchor Format", RFC 5914, DOI 10.17487/RFC5914, June 2010, . Ounsworth, et al. Expires 13 April 2026 [Page 63] Internet-Draft Composite ML-DSA October 2025 [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, . [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, . [RFC9794] Driscoll, F., Parsons, M., and B. Hale, "Terminology for Post-Quantum Traditional Hybrid Schemes", RFC 9794, DOI 10.17487/RFC9794, June 2025, . Appendix A. Maximum Key and Signature Sizes The sizes listed below are maximas. 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 is size between 3 and n - 1 [RFC8017]. Note that the size table below assumes the recommended value of e = 65537, so for RSA combinations it is in fact not a true maximum. Ounsworth, et al. Expires 13 April 2026 [Page 64] Internet-Draft Composite ML-DSA October 2025 * 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. Size values marked with an asterisk (*) in the table are not fixed but maximum possible values for the composite key or ciphertext. Implementations should be careful when performing length checking based on such values. Non-hybrid ML-DSA is included for reference. +=========================================+======+=======+=========+ | 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* |1226* |2676 | +-----------------------------------------+------+-------+---------+ | id-MLDSA44-RSA2048-PKCS15-SHA256 |1582* |1226* |2676 | +-----------------------------------------+------+-------+---------+ | id-MLDSA44-Ed25519-SHA512 |1344 |64 |2484 | +-----------------------------------------+------+-------+---------+ | id-MLDSA44-ECDSA-P256-SHA256 |1377 |81 |2492* | +-----------------------------------------+------+-------+---------+ | id-MLDSA65-RSA3072-PSS-SHA512 |2350* |1802* |3693 | +-----------------------------------------+------+-------+---------+ | id-MLDSA65-RSA3072-PKCS15-SHA512 |2350* |1802* |3693 | +-----------------------------------------+------+-------+---------+ | id-MLDSA65-RSA4096-PSS-SHA512 |2478* |2383* |3821 | +-----------------------------------------+------+-------+---------+ | id-MLDSA65-RSA4096-PKCS15-SHA512 |2478* |2383* |3821 | +-----------------------------------------+------+-------+---------+ | id-MLDSA65-ECDSA-P256-SHA512 |2017 |81 |3381* | +-----------------------------------------+------+-------+---------+ | id-MLDSA65-ECDSA-P384-SHA512 |2049 |94 |3413* | +-----------------------------------------+------+-------+---------+ | id-MLDSA65-ECDSA-brainpoolP256r1-SHA512 |2017 |82 |3381* | +-----------------------------------------+------+-------+---------+ | id-MLDSA65-Ed25519-SHA512 |1984 |64 |3373 | +-----------------------------------------+------+-------+---------+ | id-MLDSA87-ECDSA-P384-SHA512 |2689 |94 |4731* | +-----------------------------------------+------+-------+---------+ | id-MLDSA87-ECDSA-brainpoolP384r1-SHA512 |2689 |98 |4731* | Ounsworth, et al. Expires 13 April 2026 [Page 65] Internet-Draft Composite ML-DSA October 2025 +-----------------------------------------+------+-------+---------+ | id-MLDSA87-Ed448-SHAKE256 |2649 |89 |4741 | +-----------------------------------------+------+-------+---------+ | id-MLDSA87-RSA3072-PSS-SHA512 |2990* |1802* |5011 | +-----------------------------------------+------+-------+---------+ | id-MLDSA87-RSA4096-PSS-SHA512 |3118* |2383* |5139 | +-----------------------------------------+------+-------+---------+ | id-MLDSA87-ECDSA-P521-SHA512 |2725 |112 |4766* | +-----------------------------------------+------+-------+---------+ Table 4: Maximum size values of composite ML-DSA Appendix B. Component Algorithm Reference This section provides references to the full specification of the algorithms used in the composite constructions. Ounsworth, et al. Expires 13 April 2026 [Page 66] Internet-Draft Composite ML-DSA October 2025 +=========================+=========================+=============+ | 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 |[RFC3279], | | | |[RFC5915], | | | |[RFC5758], | | | |[RFC5480], | | | |[SEC1], | | | |[X9.62_2005] | +-------------------------+-------------------------+-------------+ | ecdsa-with-SHA384 | 1.2.840.10045.4.3.3 |[RFC3279], | | | |[RFC5915], | | | |[RFC5758], | | | |[RFC5480], | | | |[SEC1], | | | |[X9.62_2005] | +-------------------------+-------------------------+-------------+ | ecdsa-with-SHA512 | 1.2.840.10045.4.3.4 |[RFC3279], | | | |[RFC5915], | | | |[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 5: Component Signature Algorithms used in Composite Constructions Ounsworth, et al. Expires 13 April 2026 [Page 67] Internet-Draft Composite ML-DSA October 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 6: Elliptic Curves used in Composite Constructions +=============+=========================+===============+ | HashID | OID | Specification | +=============+=========================+===============+ | id-sha256 | 2.16.840.1.101.3.4.2.1 | [RFC6234] | +-------------+-------------------------+---------------+ | id-sha384 | 2.16.840.1.101.3.4.2.2 | [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 7: Hash algorithms used in pre-hashed Composite Constructions to build PH element Appendix C. Component AlgorithmIdentifiers for Public Keys and Signatures Many cryptographic libraries are X.509-focused and do not expose interfaces to instantiate a public key from raw bytes, but only from a SubjectPublicKeyInfo structure as you would find in an X.509 certificate, therefore implementing composite in those libraries requires reconstructing the SPKI for each component algorithm. In order to aid implementers and reduce interoperability issues, this section lists out the full public key and signature AlgorithmIdentifiers for each component algorithm. Ounsworth, et al. Expires 13 April 2026 [Page 68] Internet-Draft Composite ML-DSA October 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 & 3072* AlgorithmIdentifier of Public Key Ounsworth, et al. Expires 13 April 2026 [Page 69] Internet-Draft Composite ML-DSA October 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 4096* AlgorithmIdentifier of Public Key Ounsworth, et al. Expires 13 April 2026 [Page 70] Internet-Draft Composite ML-DSA October 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-sha384, -- (2.16.840.1.101.3.4.2.2) parameters NULL }, AlgorithmIdentifier ::= { algorithm id-mgf1, -- (1.2.840.113549.1.1.8) parameters AlgorithmIdentifier ::= { algorithm id-sha384, -- (2.16.840.1.101.3.4.2.2) 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 02 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 02 05 00 A2 03 02 01 40 *RSASSA-PKCS1-v1_5 2048 & 3072* 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 Ounsworth, et al. Expires 13 April 2026 [Page 71] Internet-Draft Composite ML-DSA October 2025 AlgorithmIdentifier of Signature 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 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 sha384WithRSAEncryption, -- (1.2.840.113549.1.1.12) parameters NULL } DER: 30 0D 06 09 2A 86 48 86 F7 0D 01 01 0C 05 00 *ECDSA NIST P256* AlgorithmIdentifier of Public Key Ounsworth, et al. Expires 13 April 2026 [Page 72] Internet-Draft Composite ML-DSA October 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 13 April 2026 [Page 73] Internet-Draft Composite ML-DSA October 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 13 April 2026 [Page 74] Internet-Draft Composite ML-DSA October 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 13 April 2026 [Page 75] Internet-Draft Composite ML-DSA October 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 13 April 2026 [Page 76] Internet-Draft Composite ML-DSA October 2025 * Label is the specific signature label for this composite algorithm, as defined in Section 7. * 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. * PH(M) is the output of hashing 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. Example of id-MLDSA65-ECDSA-P256-SHA512 construction of M'. # Inputs: M: 00010203040506070809 ctx: # Components of M': Prefix: 436f6d706f73697465416c676f726974686d5369676e61747572657332303235 Label: COMPSIG-MLDSA65-P256-SHA512 len(ctx): 00 ctx: PH(M): 0f89ee1fcb7b0a4f7809d1267a029719004c5a5e5ec323a7c3523a20974f 9a3f202f56fadba4cd9e8d654ab9f2e96dc5c795ea176fa20ede8d854c342f90353 3 # Outputs: # M' = Prefix || Label || len(ctx) || ctx || PH(M) M': 436f6d706f73697465416c676f726974686d5369676e6174757265733230323 5434f4d505349472d4d4c44534136352d503235362d534841353132000f89ee1fcb 7b0a4f7809d1267a029719004c5a5e5ec323a7c3523a20974f9a3f202f56fadba4c d9e8d654ab9f2e96dc5c795ea176fa20ede8d854c342f903533 Ounsworth, et al. Expires 13 April 2026 [Page 77] Internet-Draft Composite ML-DSA October 2025 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'. Example of id-MLDSA65-ECDSA-P256-SHA512 construction of M'. # Inputs: M: 00010203040506070809 ctx: 0813061205162623 # Components of M': Prefix: 436f6d706f73697465416c676f726974686d5369676e61747572657332303235 Label: COMPSIG-MLDSA65-P256-SHA512 len(ctx): 08 ctx: 0813061205162623 PH(M): 0f89ee1fcb7b0a4f7809d1267a029719004c5a5e5ec323a7c3523a20974f 9a3f202f56fadba4cd9e8d654ab9f2e96dc5c795ea176fa20ede8d854c342f90353 3 # Outputs: # M' = Prefix || Label || len(ctx) || ctx || PH(M) M': 436f6d706f73697465416c676f726974686d5369676e6174757265733230323 5434f4d505349472d4d4c44534136352d503235362d534841353132080813061205 1626230f89ee1fcb7b0a4f7809d1267a029719004c5a5e5ec323a7c3523a20974f9 a3f202f56fadba4cd9e8d654ab9f2e96dc5c795ea176fa20ede8d854c342f903533 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: Ounsworth, et al. Expires 13 April 2026 [Page 78] Internet-Draft Composite ML-DSA October 2025 * tcId the name of the algorithm. * pk the verification public key. * x5c a self-signed X.509 certificate of the public key. * 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 { "m": "VGhlIHF1aWNrIGJyb3duIGZveCBqdW1wcyBvdmVyIHRoZSBsYXp5IGRvZy4=", "tests": [ { "tcId": "id-ML-DSA-44", "pk": "Pt0xq/YgSq0cwBnJoO+rB4tu 6rQwUSNeXgM8WAKRacRSBfCzlazV6YWykOdYA8Ct1/Ox7jWe3/aSLcXcWJv2Cne25xY/ Jc5b0LPwswKo2cz2oUB4zXR+YALJUP9h9dpxNhNgIr1rs0lD6xsWAKZADWr1EWsaxq0R NY7DN0xJK0YO9eFWY1y3FLyT37nZJ7vU4nVJCk4L9J1l6xFiJ0nh/AjnJ+P/49ch7Nyq 3i73DN3BIt1WC+J8fqqVstwZhArVakKpSJoFvbWkvkYdam20Ezgtcu4lLAIYBgpfG28C 3dqcWyOXr9w0Ixh215UCTVZcGWrJn9cjg0tqugKA7d8PAe2EB/6jZCo7Imy5xqXPasSv JvVhbzoNKUBimTRT3g7z+jWe1AHcBsIRMeRcZVXOOIjISO1XWXwi9FiRXZM0z+FpwKIp Ounsworth, et al. Expires 13 April 2026 [Page 79] Internet-Draft Composite ML-DSA October 2025 6V0otiQ6jIoiA4X41J443rD7KsTjZYaBim5uQ4fXpO5rCOpNf5SYE79y56dnwjXLVfSg Rpv1i1PW8pW60w/iCrcBnc0r29YWBRRfP6sMora1NmouuQ9n23Y1UU4546AFEC/PhaNj YnteJEDRDMjHUvTvkmnT07dSNuaTSPkt8Af2HvV2orAw0cEML6HiK6TnxAije3e9W6lJ cXQY4UM3xVOSRrTWFKnVFi1/i8sgq0NNaaz9Uv7whVNpNVobp7m9sQLIjFnaBx5XJLCE 0KCf9YMkc4BDAN2YZoouVmXEUV3t8ULeN4YYr3OMdpuK7ltszcyifrr3TKSpz4fvP8/0 9fkB60Zt/51vlRD1UbnwZzwNmD0f4h2UkNXkONKOLHsZUWDDML1HLXfpaTtj9UGgmxl5 MpcIBY+WbrRD/oytNSTQeQHjwCa3NriewfzzFuqhDsepVpiE2e3GDnTC3mUxI82OqN8G GUmQoA5lN6YcN423ZXCnj7wWWV2J664PvPlJnjsJqUmKeyAGiOe43aDeX0S83ouR0Rkh 9tV2kedDe0XA/C03exOkf3f9BFoSAbOioLi58nhNhxFUKctH8HiG0gcrSFCFT48QB3ms HckUySfWONJujubnmv+H7y12Q0QDB9lw2Icvbiro1xtSWDRAVVY3x/nsWQPDpXPEYzun DYOUVpSuaXAofounmsq6tOVVOKFvB/bW5FDOipx9jxa6GCRIgH5F3yM80CNibhDLEKxy MGbvEt4jBgBTp81YoP+XW3Hxd720xlHRHRifcbOni0wdNDwYKfuFOw3KE+mRTv2WbCjC TZ0/6cFTVZA+BR0gfk3B8aMEdCU/Ids9zNetaWi11lSYlUjDmvpobPsDAhtKLF3GYs0e bgxEuJi0HGZ6T1m+u7SfZfcIzv2WNMMpfcG8S6V7/dRI8xlDFMoIHgt3Qx3kA3c8HY6a N0e3nvWFNdNK6wLB6ND6HB7qS0NJm29Yq1a9w0L0IwEPjdjCVXyosKnqTmugu10jlLYE 14WaBQl1RdkyVty+E/uG24ssTAoMWA+xGKJaVClhuPogWM5teDsLwo+V32VzkisbFR9U RmIG37a6E10kQos8ggPaUTtJMHQY/iirAdcryVO7OGJSzzsK4FFnCgqPpdcIUwgT7RSp wAjzhVd6B+4pgkMcroIVdv36vtS0rAx4UpSSI4lpGNPYIGmJbEheHL9cVp2e1RBVGJjY YT7vJyyL6nDjaUMYZxafa0WL59VP3NRH36/a5CPdWEd80XFakwqyfvdJWkFpNIoF+Zbz Dq0z0dCxwktNppo8bbZO6XIjGQ==", "x5c": "MIIPjDCCBgKgAwIBAgIUTi0g/HXrJ PlGwm37ybFrWW2WlkkwCwYJYIZIAWUDBAMRMDYxDTALBgNVBAoMBElFVEYxDjAMBgNVB AsMBUxBTVBTMRUwEwYDVQQDDAxpZC1NTC1EU0EtNDQwHhcNMjUxMDA5MDAyOTQ3WhcNM zUxMDEwMDAyOTQ3WjA2MQ0wCwYDVQQKDARJRVRGMQ4wDAYDVQQLDAVMQU1QUzEVMBMGA 1UEAwwMaWQtTUwtRFNBLTQ0MIIFMjALBglghkgBZQMEAxEDggUhAD7dMav2IEqtHMAZy aDvqweLbuq0MFEjXl4DPFgCkWnEUgXws5Ws1emFspDnWAPArdfzse41nt/2ki3F3Fib9 gp3tucWPyXOW9Cz8LMCqNnM9qFAeM10fmACyVD/YfXacTYTYCK9a7NJQ+sbFgCmQA1q9 RFrGsatETWOwzdMSStGDvXhVmNctxS8k9+52Se71OJ1SQpOC/SdZesRYidJ4fwI5yfj/ +PXIezcqt4u9wzdwSLdVgvifH6qlbLcGYQK1WpCqUiaBb21pL5GHWpttBM4LXLuJSwCG AYKXxtvAt3anFsjl6/cNCMYdteVAk1WXBlqyZ/XI4NLaroCgO3fDwHthAf+o2QqOyJsu calz2rEryb1YW86DSlAYpk0U94O8/o1ntQB3AbCETHkXGVVzjiIyEjtV1l8IvRYkV2TN M/hacCiKeldKLYkOoyKIgOF+NSeON6w+yrE42WGgYpubkOH16TuawjqTX+UmBO/cuenZ 8I1y1X0oEab9YtT1vKVutMP4gq3AZ3NK9vWFgUUXz+rDKK2tTZqLrkPZ9t2NVFOOeOgB RAvz4WjY2J7XiRA0QzIx1L075Jp09O3Ujbmk0j5LfAH9h71dqKwMNHBDC+h4iuk58QIo 3t3vVupSXF0GOFDN8VTkka01hSp1RYtf4vLIKtDTWms/VL+8IVTaTVaG6e5vbECyIxZ2 gceVySwhNCgn/WDJHOAQwDdmGaKLlZlxFFd7fFC3jeGGK9zjHabiu5bbM3Mon6690ykq c+H7z/P9PX5AetGbf+db5UQ9VG58Gc8DZg9H+IdlJDV5DjSjix7GVFgwzC9Ry136Wk7Y /VBoJsZeTKXCAWPlm60Q/6MrTUk0HkB48Amtza4nsH88xbqoQ7HqVaYhNntxg50wt5lM SPNjqjfBhlJkKAOZTemHDeNt2Vwp4+8FlldieuuD7z5SZ47CalJinsgBojnuN2g3l9Ev N6LkdEZIfbVdpHnQ3tFwPwtN3sTpH93/QRaEgGzoqC4ufJ4TYcRVCnLR/B4htIHK0hQh U+PEAd5rB3JFMkn1jjSbo7m55r/h+8tdkNEAwfZcNiHL24q6NcbUlg0QFVWN8f57FkDw 6VzxGM7pw2DlFaUrmlwKH6Lp5rKurTlVTihbwf21uRQzoqcfY8WuhgkSIB+Rd8jPNAjY m4QyxCscjBm7xLeIwYAU6fNWKD/l1tx8Xe9tMZR0R0Yn3Gzp4tMHTQ8GCn7hTsNyhPpk U79lmwowk2dP+nBU1WQPgUdIH5NwfGjBHQlPyHbPczXrWlotdZUmJVIw5r6aGz7AwIbS ixdxmLNHm4MRLiYtBxmek9Zvru0n2X3CM79ljTDKX3BvEule/3USPMZQxTKCB4Ld0Md5 AN3PB2OmjdHt571hTXTSusCwejQ+hwe6ktDSZtvWKtWvcNC9CMBD43YwlV8qLCp6k5ro LtdI5S2BNeFmgUJdUXZMlbcvhP7htuLLEwKDFgPsRiiWlQpYbj6IFjObXg7C8KPld9lc 5IrGxUfVEZiBt+2uhNdJEKLPIID2lE7STB0GP4oqwHXK8lTuzhiUs87CuBRZwoKj6XXC Ounsworth, et al. 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Expires 13 April 2026 [Page 93] Internet-Draft Composite ML-DSA October 2025 UCNlh31FJ7h5SW3EVydnnP1dj7WYGHldACLDFQV1qYsbPH2NkAAAAAAAAAAAAAAAAHFB sgJi4zPw==" }, { "tcId": "id-MLDSA44-RSA2048-PSS-SHA256", "pk": "Q8V RtSA1V+BNZpZQyiKJ8NIve4U0QFkLZddlbM1u3Owa8y9AgfIiSXxRjtG9ISWkJgFTvWc 74G51yzcz9puMFDnKw2bylMi9uP7gbYPj1SRMn7y5JkAmAxF4q+hJgzrr9mGu8aCc/X4 ELrrEuMpMRcCGbrrRlIJUBMq2LF8ymby9gSbvXQkicbLAKaoU+0yJYTfGKZvc0cJFDxc STYxx4WCKnwuLsZsBBrfajhGuUAsgxud7x22FyHUQaOgAGym0kHzi2QubIfajJpjNPOm bT6VmT0wYYIj8In5WbG275/tDEfg3IsF91pzYQqTfAH1TfCel6EmB3jDzNyLWqnGvmjU dWpRXVvlDOl4qsQZODmm6s9+HBkhOQB8LztYm4SvOW2NvaKnAT7O7JLnwS7uYASJe7kM vMJ4z9TizAkGNU8H4QpUKAoJj/fP7bAbEjUueD4hfvPK95XoBoONCnOGNeSHOz/IH/WG gSqcjAGPSGK79Re9rNJZ0Yh540FwOlx8T4DDJbDq62NX8pvofaI7lsuGZQT0FJTTML8l 6ba1MbOgF/BCfJIz9kslBKQh9QcDIeZCuFwzRbphTklrP4bddEzdc6nTsval7yAgIirb IyZYjQeE6zkYPVC5QR62siwv/F+4FTA2zcv661E2Lq+31EDNA8fi7/sAG5DYXRgvaihw cUJVKq4poLHpgUq35RxlczyASmZ3zthb3SRiUNA7iSPpR17tt3TAL4t9PbG+Pr5DVH82 8tE3E0uTGWFCVw+SksnxUwVMwmh5WoqymQWLU65VcFCIzdV55TSnE8kk19MSJFQlRGiZ 8CLvbXyN2fHyWKybCk28Zgyykc6trBTZoUE8IacoDnm5N7/nWRea1k+B/89R4UhMqu/U OlVKR+dVls+YU3gmWC7WUZwnwqKVLlma5XgTUW9rOF/GvjZjCH8aMT0HBgvbevmzSv6s i1w8ged9xgbsMA7HypG3NJHqXkLESQu5/yBz2nUVFWM7bsafndqDdwSCsQK+SD+GZATj TDKvP5CWBlz16Y1iz4Pu6DxBnSv5AYQ2K/og+1FG8xC632NMOXOrJu3ajRe/qH9smMGL OwsK0AOf8NKIHbk2qYU0eJ9NCwlRJS5gEnjAXoOHmukLxUeUoRGfIB9OXUr6mH03IoHP wJTbgCNfzojbBaZGk43ctYEUJQ8pS3A0j2c5kHD7whfGnRisqPsviPjDCyEeq6UD4mde GTz6ATXk0gjKOo0IKzof25cb0hmrGDKppyKMb1H66FwbkAMTJhTEK1Hs50A86KVoOWPZ 0ONIH/zRLNAjt1kNIHTgUdV7t8S20apjQ3vqY7drwB/rXtLSwJWiA+zks2tk+VzoOhwH WFHgAsDsh/lGuTF9TotZsjcwSceNCi5mcWLWzdrNT+K+jv/I4RlFCDiNPXt4Hhy7FkzB AVco/ozgtBXAgWX9q+a0pl0RFyTiN6eI/fPaf+Uo8o7Ht9ZiExQqlad7HtF5E46riaeq 6NUyvr/TSA4bBft6vDzu5imDMUll3cFJKYMXII2jJzjsrtEIuoidt+fWp02QefKOG+lx 4wVH5iu+tp3XsRh5++/L+TPn9bbK+uyUvuCEfNhgPRE4XsNwwn7rLSjL/BrLB61zHqPV TfD+2HS2cwKgeOLk2igXX6Vr0rjKMN9SJvDWtWdaI3IuKSgbmgYRY9Ew5IJUcD8HbtME 6ORfINPjk1lqCg84wSR58/1crvysJsSGZsMb+DLCppdTuwTCCAQoCggEBAKnn2WavYbA rpv6UTVXSOk5EeWTLq2I22NQEV1We6c8iiYn3bwbez6aHpSc9KlM9GGG2uI0zeU3cx7s 3lL1JkKxBsPEe0A2Qjl/CwglcMZ7sQ/5F7eHY3hB7XwC9BCP5ciB1pfCPBw1pEr3hNoE PYz44FVsBc091f2EhqfZOVmPtNwdFog6Uy7WgDAhZOt3er04yuBXs+zZlfS1G31BQE7L 2DPbaADu6YIZwvNzluAnVmxl3CL7eb9ZOApvm89cYYBfspTyQ62YvkzcPZ4MvGvR1ZXj XVEkj6I+7nGEp1Xqybvq+eUFVzS90JcVane1rRxvD/gJP3C2mN+Gx5EL46tcCAwEAAQ= =", "x5c": "MIIRwjCCBzagAwIBAgIUfWz7dlzuLf2rw6OluQNEmH6nbR0wDQYLYIZI AYb6a1AJARQwRzENMAsGA1UECgwESUVURjEOMAwGA1UECwwFTEFNUFMxJjAkBgNVBAMM HWlkLU1MRFNBNDQtUlNBMjA0OC1QU1MtU0hBMjU2MB4XDTI1MTAwOTAwMjk0N1oXDTM1 MTAxMDAwMjk0N1owRzENMAsGA1UECgwESUVURjEOMAwGA1UECwwFTEFNUFMxJjAkBgNV BAMMHWlkLU1MRFNBNDQtUlNBMjA0OC1QU1MtU0hBMjU2MIIGQjANBgtghkgBhvprUAkB FAOCBi8AQ8VRtSA1V+BNZpZQyiKJ8NIve4U0QFkLZddlbM1u3Owa8y9AgfIiSXxRjtG9 ISWkJgFTvWc74G51yzcz9puMFDnKw2bylMi9uP7gbYPj1SRMn7y5JkAmAxF4q+hJgzrr 9mGu8aCc/X4ELrrEuMpMRcCGbrrRlIJUBMq2LF8ymby9gSbvXQkicbLAKaoU+0yJYTfG KZvc0cJFDxcSTYxx4WCKnwuLsZsBBrfajhGuUAsgxud7x22FyHUQaOgAGym0kHzi2Qub IfajJpjNPOmbT6VmT0wYYIj8In5WbG275/tDEfg3IsF91pzYQqTfAH1TfCel6EmB3jDz Ounsworth, et al. 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Expires 13 April 2026 [Page 185] Internet-Draft Composite ML-DSA October 2025 }, { "tcId": "id-MLDSA87-RSA4096-PSS-SHA512", "pk": "t113deEjdkghUgAQHY9 HysmytcBlJ/ujk2CRpdNSry2MXD8asXY13p8Mur6wvHs/o/fIE7aPRDmwMiGtkHa3zUp tz8AJHtfw4uBo5dG/E6jBxYt2IP1GLyFQgEPqIuVbA5xy2K8mb7tN2zE/b+y+3mlilP+ U5wFZlB6ZmURvbEKE7WqoozLpmHX7oHayAZjF8ImvR3eAerqFt/Q+Tix20kuns3cMggF z0OoRFgbmTLecr9snuQiKvSZSqaKydpo+rDsIP3mAkrHJ7fNbNcULZrrFKRMVJOu1lde Ja1fIUCDLcIjxLLJnazGTjS7Ft/TZ838uDR6txiGGNNqfrACoQjsirIn7Jwg5xSNn19I taXwNWF9aPD72K5uxKrs0YhJ8EKETXgdGSVLGVmSaKnzpksb0GQpA/OnOb6Nn9X4X0ec nEJRYGb5h9xrR3tK1Xs+MONNfU09H2zKVv8hV8fXfhNWNQsyul8E70ouQy6nfAjY3kak a1eKQ9xuR9oCQVaWBJwi5gLYusHix0qWGbCpzT7IQS1tmjSR8FHEYP15NlQGEZHaRfEr nWIrMZeYKGtQNoBO4iYlPLc/nKZX5tMZqYYMgQFsdherGdVH3N9H4qqcRwH22QM+EoA1 g4gxKS5qNfb3cQMITnMfQfMHUyCpJb2wDMJxzCJGa9ogG8rZ+MYmSExcfKjI1Gulpw7i 3yBkRgaPtft0ymO+vfgEoq2pmUgXyipstrE+xCNI0IrrPfGYKE2Na9Crzk3cJlJgzgoY B+XT1z03S9Gew3+miviilbpVx0k7RtjDYPDvSUPYGVA2rkjz7byopbh0gAspFWO1CQ2Q S74nk8ghb/yWzulzBNzfprG1j9z57yGo/0soCGq09JDOEcGAFLhSuwWkYFtwKUW7qcvC mWvTtshuPh88sFyqwmYxFcnrzaqOvgs7dSt1VX4cUuDdUL1L3pf5l+NxF/8+VZdRBzwR Fok1KLeOB6jbPc5/g1yImGJo8fGZFxsSGPa++JjXlQtVMb2i/t1cLmchao8BFwO2yMVq PZqHZZGcSM2y3Q+ZpG1ePM7JcdfVELaMeYI7fMzxC2lF1DXacd9/9K4+vdEeECe9KvQE 6siE9mXtPbD1MjUvFm58tfSy1S1xdLoXiFTi2RKjolM/1varF6og3+Jsj2DMu2LNSL1x xJ45Y4xUX8fpsEH7lNSXzv5yW6hrPcpCuKiRmQ9PUr7Xp95G92Ce9HrsJlksIPIEWQBz QapKoHOYPq8/oSsa2g5ypIwF2/qS3bvXXpDwi6XV5lrPedI/HVzwa9KkyD/8QjVFpAgv Zo/e8pfXqe04A2S0UsvK4jsCn8jX144bFBP2dePp/osYvdgYVnvCkvvwRHplpONTcNu3 hu6ztv7+6mbMpZS4ucHBaoKyBE+7ZC/5TEyWSRrjIlqsCW+FpuTIgP/RuBcMyIhQ4DAx iqUw0jXJBT5KK37JMkCOeYAd8otApvkuIPOb03f68ZU/Qwgl27AJDynrcabKtoQ93IJi raU27WkuMcecH/7jH3SlZ7uaUcIJlonpG7P6ECfeyHd0BPGfFLIhYMNbayz2TcaUlnph ctb8cS5RPM6n9yuOe3KvCc4AfFpj5JwglTGiN8OGAfBETDOCmFHJ0N/zMdGJvDC3Fyo0 kAis+HGqZobJDw7YhRvCYhrJHiUYLUyn6SAky1shpszq9dreDi04OsmpLvn3WEMCo0nO Si/3dA9NtB+E1aXgKHmGtm+hzem0aoXQpgsSPDsG3gAXA9UbHa3e91kHjKQ1mGNMDLBu McGhJtOxIGkVXk/CoU0/srvMPiXxlaIDoQO+DDd/BAxFIj7xzi1FrFjClZEB8SojSo08 ph52GoNLDQVBpgDzhWH5TKDprlrekRbFabN724QsviGI8eXFap8LW9/0HlRW3f/TWyeD whauRzd+7ibE9Ln+zFbL3i0NgMl68l87PdmSB5xqB+EbwAS7GTIpebTrzC6pKVxOjrAw ucreZSEUgYBMOoheVZTjnSWnbmh+2gUDljJOrOowyLcphYVyYyF8HURQp5K9OksM68+w 6I+/Cts3qpgjHBrJm0RQuZOF+dHgscYRO78GL/ukCc+nZwDg6GkDBYgpNtrKiSZ9cwQt /PyFLj86eLJ1exYkKVbrculd4SFnRdr2ZnHJtIn7Ue1RXj4TPR/6nRF5bXKXnllwU76Z KGQlYjptrWJJyt+JA1JKKMjtt2i8xbYoSqB6hcSzLUtuky8tDHQpqyluhNFsPfkpo9sA 9Yxa3VzQRDQ/xpOpg4cQxBM1vSzjGZEB9N5V4jEvEJ2rhz4LNhCIKg9wYmNZtSMBxVNn qmbpFvW2iInltAoWoFpPJ+D5TKXqtQvUS70ywEYt6Z3WdFYtAPSbRjSqbJj5o+NPwzhO KVvQyCCBmtov0TScJePSZt4kmL4m5+/oI8m4oSH9yrGXYL8ihgt1oqx1BMQnAIITJ5sZ p5buR+anYr2c4iKxIvBiVjtWPPQCrQjj0n9nTAgSRE9Yq05ebYs2i08UsJV+WcxT0nP8 xmXpt2TQccTx8BDoWz6pkm0pOVBuyLoXnX6rALqx0fj6oTAbqsXtK0wF9IkfPOeBS2iR 5GhVT+7CZYv35jy41K7ykj1Fi1J5mmHzUW+vSMaAhXQNpAhkRErD9nGO6Wz9s4dELW6F Z4f5y3Te2i5np2wJY5/bbdye++fSIuIDH+cE3Lu+cSi52kuvUU8kli10cEZ/qeE1QXUl ILERBzDbPDpV6VyEHIL1hwqm6YiJgj92kYr1k3H3THAvLZpYtXzVs594JCtwVdQVuLhu IR/luF261q+cx+agVHNRcPOQZRxYxP42eUK3zssF1BHqGaX97eaab2gX/6SEa5EqDRck uqDbBJmMmGCoHcxDE/GzyQJ76yuwBZaKZ9eKreWcnWLLZs0/RHPCwqfR1VYqN8yBp7ci Ounsworth, et al. 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Intellectual Property Considerations The following IPR Disclosure relates to this document: 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: Ounsworth, et al. Expires 13 April 2026 [Page 201] Internet-Draft Composite ML-DSA October 2025 Serge Mister (Entrust), Felipe Ventura (Entrust), Richard Kettlewell (Entrust), Ali Noman (Entrust), 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 (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 to Dr. Hale along with Peter C and John Mattsson with analyzing the scheme with respect to EUF-CMA, SUF-CMA and Non- Separability properties. We wish to acknowledge particular effort from Carl Wallace and Daniel Van Geest (CryptoNext Security), who have put in sustained effort over multiple years both reviewing and implementing at the hackathon each iteration of this document. 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 Ounsworth, et al. Expires 13 April 2026 [Page 202] Internet-Draft Composite ML-DSA October 2025 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 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 13 April 2026 [Page 203]