Internet DRAFT - draft-kiyomoto-kcipher2-tls
draft-kiyomoto-kcipher2-tls
Internet Engineering Task Force Y. Hori
Internet-Draft Saga University
Intended status: Informational T. Uehara
Expires: May 4, 2016 Ritsumeikan University
November 1, 2015
Use of KCipher-2 with Poly1305 in Transport Layer Security
draft-kiyomoto-kcipher2-tls-02
Abstract
This document describes the use of the KCipher-2 stream cipher with
Poly1305 in Transport Layer Security (TLS) protocols version 1.2 and
Datagram Transport Layer Security (DTLS) protocols. KCipher-2 is a
stream cipher with a 128-bit key and a 128-bit initialization vector,
which provides fast, efficient encryption and decryption.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. KCipher2 . . . . . . . . . . . . . . . . . . . . . . . . 2
1.2. Poly1305 Authenticator . . . . . . . . . . . . . . . . . 3
1.3. Terminology . . . . . . . . . . . . . . . . . . . . . . . 3
2. Cipher Suites Values . . . . . . . . . . . . . . . . . . . . 3
3. Cipher Suite Definitions . . . . . . . . . . . . . . . . . . 3
3.1. Key Exchange . . . . . . . . . . . . . . . . . . . . . . 3
3.2. Cipher . . . . . . . . . . . . . . . . . . . . . . . . . 3
3.3. Pseudorandom Function . . . . . . . . . . . . . . . . . . 3
3.4. AEAD Construction . . . . . . . . . . . . . . . . . . . . 3
4. Security Considerations . . . . . . . . . . . . . . . . . . . 4
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 4
6. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 4
7. References . . . . . . . . . . . . . . . . . . . . . . . . . 4
7.1. Normative References . . . . . . . . . . . . . . . . . . 4
7.2. Informative References . . . . . . . . . . . . . . . . . 5
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 6
1. Introduction
This document describes the use of the KCipher-2 [RFC7008] in the
Transport Layer Security (TLS) version 1.2 [RFC5246] protocol, as
well as in the Datagram Transport Layer Security (DTLS) version 1.2
[RFC6347], or any later versions.
Cryptographic operations used in TLS can be categorized in five ways:
digital signing, stream cipher encryption, block cipher encryption,
authenticated encryption with additional data encryption, and public
key encryption [RFC5246]. This document defines the cipher suites to
use KCipher-2 for stream cipher encryption in TLS. KCipher-2 is a
fast, secure stream cipher algorithm as well as ChaCha20 [ChaCha20].
1.1. KCipher2
KCipher-2 is a stream cipher algorithm with a 128-bit key and a
128-bit initialization vector (IV). The algorithm and other
properties are described in [SECRYPT]. KCipher-2 has been evaluated
by the cryptographic technique evaluation project for the Japanese
e-Government [CRYPTREC]. KCipher-2 also has been submitted to
another international standardization body [ISO18033].
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1.2. Poly1305 Authenticator
Poly1305 [POLY1305] is a Wegman-Carter, one-time authenticator
designed by D. J. Bernstein. In details, Poly1305 is described in
Section 2.5 and 2.6 of [RFC7539] .
1.3. Terminology
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in [RFC2119].
2. Cipher Suites Values
The following are proposed identifiers and values for the cipher
suites of TLS.
CipherSuite TLS_ECDHE_RSA_WITH_KCIPHER2_128_POLY1305 = { TBD, TBD };
CipherSuite TLS_ECDHE_ECDSA_WITH_KCIPHER2_128_POLY1305 = { TBD, TBD };
CipherSuite TLS_DHE_RSA_WITH_KCIPHER2_128_POLY1305 = { TBD, TBD };
3. Cipher Suite Definitions
3.1. Key Exchange
The DHE_RSA, ECDHE_RSA, and ECDHE_ECDSA key exchanges are performed
as defined in [RFC5246] and [RFC4496].
3.2. Cipher
The KCIPHER2_128 cipher suites use KCipher-2 with a 128-bit key and a
128-bit initialization vector.
3.3. Pseudorandom Function
For the cipher suites in this document, [RFC2104] based on SHA-256 is
used for TLS PseudoRandom Function (PRF) [RFC5246] with SHA-256 is
used as the PRF.
3.4. AEAD Construction
KCIPHER2_128_POLY1305 is an authenticated encryption with additional
data algorithm. The KCipher-2 and Poly1305 [POLY1305]primitives are
combined into an AEAD.
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4. Security Considerations
As of the time this document was written, we are not aware of any
attack on KCipher-2. No security vulnerabilities have been
identified in the security evaluations by the KCipher-2 developers
and other independent institutions [SECRYPT], [CRYPTREC10], and
[KDDI].
Poly1305 is designed to ensure that forged messages are rejected with
a probability of 1-(n/2^102) for a 16*n byte message, even after
sending 2^64 legitimate messages.
5. IANA Considerations
IANA is requested to allocate the following numbers in the TLS Cipher
Suite Registry:
CipherSuite TLS_ECDHE_RSA_WITH_KCIPHER2_128_POLY1305 = { TBD, TBD };
CipherSuite TLS_ECDHE_ECDSA_WITH_KCIPHER2_128_POLY1305 = { TBD, TBD };
CipherSuite TLS_DHE_RSA_WITH_KCIPHER2_128_POLY1305 = { TBD, TBD };
6. Acknowledgements
Thanks to Marshall Rose for developing the XML2RFC format.
Thanks to Shinsaku Kiyomoto who is an author of draft-kiyomoto-
kcipher2-tls-01.txt.
7. References
7.1. Normative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/
RFC2119, March 1997,
<http://www.rfc-editor.org/info/rfc2119>.
[RFC4496] Stecher, M. and A. Barbir, "Open Pluggable Edge Services
(OPES) SMTP Use Cases", RFC 4496, DOI 10.17487/RFC4496,
May 2006, <http://www.rfc-editor.org/info/rfc4496>.
[RFC5246] Dierks, T. and E. Rescorla, "The Transport Layer Security
(TLS) Protocol Version 1.2", RFC 5246, DOI 10.17487/
RFC5246, August 2008,
<http://www.rfc-editor.org/info/rfc5246>.
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[RFC6347] Rescorla, E. and N. Modadugu, "Datagram Transport Layer
Security Version 1.2", RFC 6347, DOI 10.17487/RFC6347,
January 2012, <http://www.rfc-editor.org/info/rfc6347>.
[RFC7008] Kiyomoto, S. and W. Shin, "A Description of the KCipher-2
Encryption Algorithm", RFC 7008, DOI 10.17487/RFC7008,
August 2013, <http://www.rfc-editor.org/info/rfc7008>.
[RFC7539] Nir, Y. and A. Langley, "ChaCha20 and Poly1305 for IETF
Protocols", RFC 7539, DOI 10.17487/RFC7539, May 2015,
<http://www.rfc-editor.org/info/rfc7539>.
7.2. Informative References
[ChaCha20]
Bernstein, D., "ChaCha, a variant of Salsa20", January
2008, <http://cr.yp.to/chacha/chacha-20080128.pdf>.
[CRYPTREC]
CRYPTREC (Cryptography Research and Evaluation
Committees), , <http://www.cryptrec.go.jp/english/>.
[CRYPTREC10]
Bogdanov, A., Preneel, B., and V. Rijmen, "Security
Evaluation of the K2 Stream Cipher", 2010,
<http://www.cryptrec.go.jp/english/estimation.html>.
[ISO18033]
International Organization for Standardization,
"Information technology - Security techniques - Encryption
algorithms - Part 4: Stream ciphers", ISO/IEC 18033-4,
December 2011.
[KDDI] Roy, B., "Evaluation of the Word-Oriented Stream Cipher:
K2", 2009, <http://www.kddilabs.jp/kcipher2/kcipher2.htm>.
[POLY1305]
Bernstein, D., "The Poly1305-AES message-authentication
code.", March 2005,
<http://cr.yp.to/mac/poly1305-20050329.pdf>.
[RFC2104] Krawczyk, H., Bellare, M., and R. Canetti, "HMAC: Keyed-
Hashing for Message Authentication", RFC 2104, DOI
10.17487/RFC2104, February 1997,
<http://www.rfc-editor.org/info/rfc2104>.
[SECRYPT] Kiyomoto, S., Tanaka, T., and K. Sakurai, "K2: A Stream
Cipher Algorithm Using Dynamic Feedback Control", 2007.
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Authors' Addresses
Yoshiaki Hori
Saga University
1 Honjo
Saga-shi, Saga 840-8502
JP
Phone: +81-952-28-8982
Email: horiyo@cc.saga-u.ac.jp
Tetsutaro Uehara
Ritsumeikan University
1-1-1 Noji-higashi
Kusatsu-shi, Shiga 525-8577
JP
Phone: +81-77-599-4357
Email: uehara@cs.ritsumei.ac.jp
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