Internet DRAFT - draft-bjhan-tls-seed
draft-bjhan-tls-seed
TLS Working Group B. Han
Internet Draft D. Shin
Obsoletes: 4162 H. Jeong
Intended Status: Standard Track Y. Won
Expires: December 17, 2011 KISA
June 15, 2011
Addition of SEED Cipher Suites to Transport Layer Security (TLS)
draft-bjhan-tls-seed-00
Abstract
This document proposes the addition of new cipher suites to the
Transport Layer Security (TLS) protocol to support the SEED
encryption algorithm as a block cipher algorithm.
Status of this Memo
This Internet-Draft is submitted to IETF in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF), its areas, and its working groups. Note that
other groups may also distribute working documents as
Internet-Drafts.
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."
The list of current Internet-Drafts can be accessed at
http://www.ietf.org/1id-abstracts.html
The list of Internet-Draft Shadow Directories can be accessed at
http://www.ietf.org/shadow.html
Copyright and License Notice
Copyright (c) 2011 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
Han. et al. Expires December 17, 2011 [Page 1]
INTERNET DRAFT SEED Cipher Suites to TLS June 15, 2011
(http://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 Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. SEED . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2. Terminology . . . . . . . . . . . . . . . . . . . . . . . 3
2. Proposed Cipher Suites . . . . . . . . . . . . . . . . . . . . 4
2.1. HMAC-Based Cipher Suites . . . . . . . . . . . . . . . . . 4
2.2. GCM-Based Cipher Suites . . . . . . . . . . . . . . . . . 4
2.3. PSK Cipher Suites . . . . . . . . . . . . . . . . . . . . 5
3. Cipher Suite Definitions . . . . . . . . . . . . . . . . . . . 5
3.1. Key Exchange . . . . . . . . . . . . . . . . . . . . . . . 5
3.2. Cipher . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.3. PRFs . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.4. PSK Cipher Suites . . . . . . . . . . . . . . . . . . . . 5
4. Security Considerations . . . . . . . . . . . . . . . . . . . 6
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 7
6. References . . . . . . . . . . . . . . . . . . . . . . . . . . 8
6.1 Normative References . . . . . . . . . . . . . . . . . . . 8
6.2 Informative References . . . . . . . . . . . . . . . . . . 9
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 9
Han. et al. Expires December 17, 2011 [Page 2]
INTERNET DRAFT SEED Cipher Suites to TLS June 15, 2011
1. Introduction
This document specifies cipher suites for the Transport Layer
Security (TLS) [RFC5246] protocol to support the SEED [RFC4269]
encryption algorithm as a block cipher algorithm. The cipher suites
include variants using the SHA-2 family of cryptographic hash
functions and SEED Galois counter mode. Elliptic curve cipher suites
and pre-shared key (PSK) cipher suites are also defined.
The cipher suites with SHA-1 are not included in this document. Due
to recent analytic work on SHA-1 [Wang05], the IETF is gradually
moving away from SHA-1 and towards stronger hash algorithms.
The SEED cipher suites for TLS 1.0 originally specified in [RFC4162]
This document obsoletes RFC 4162.
1.1. SEED
SEED is a symmetric encryption algorithm that was developed by Korea
Internet & Security Agency (KISA) and a group of experts, beginning
in 1998. The input/output block size of SEED is 128-bit and the key
length is also 128-bit. SEED has the 16-round Feistel structure. A
128-bit input is divided into two 64-bit blocks and the right 64-bit
block is an input to the round function with a 64-bit subkey
generated from the key scheduling.
SEED is easily implemented in various software and hardware because
it is designed to increase the efficiency of memory storage and the
simplicity of generating keys without degrading the security of the
algorithm. In particular, it can be effectively adopted in a
computing environment that has a restricted resources such as mobile
devices, smart cards, and so on.
SEED is a national industrial association standard [TTASSEED] and is
widely used in South Korea for electronic commerce and financial
services operated on wired & wireless PKI. The SEED homepage,
http://seed.kisa.or.kr/eng/about/about.jsp, contains a wealth of
information about SEED, including detailed specification, evaluation
report, test vectors, and so on.
1.2. 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 RFC 2119 [RFC2119].
Han. et al. Expires December 17, 2011 [Page 3]
INTERNET DRAFT SEED Cipher Suites to TLS June 15, 2011
2. Proposed Cipher Suites
2.1. HMAC-Based Cipher Suites
The first ten cipher suites use SEED0 [RFC4269] in Cipher Block
Chaining (CBC) mode with a SHA-2 family Hashed Message Authentication
Code (HMAC). Eight out of twenty use elliptic curves.
CipherSuite TLS_RSA_WITH_SEED_128_CBC_SHA256 = { TBD,TBD };
CipherSuite TLS_DH_DSS_WITH_SEED_128_CBC_SHA256 = { TBD,TBD };
CipherSuite TLS_DH_RSA_WITH_SEED_128_CBC_SHA256 = { TBD,TBD };
CipherSuite TLS_DHE_DSS_WITH_SEED_128_CBC_SHA256 = { TBD,TBD };
CipherSuite TLS_DHE_RSA_WITH_SEED_128_CBC_SHA256 = { TBD,TBD };
CipherSuite TLS_DH_anon_WITH_SEED_128_CBC_SHA256 = { TBD,TBD };
CipherSuite TLS_ECDHE_ECDSA_WITH_SEED_128_CBC_SHA256 = { TBD,TBD };
CipherSuite TLS_ECDH_ECDSA_WITH_SEED_128_CBC_SHA256 = { TBD,TBD };
CipherSuite TLS_ECDHE_RSA_WITH_SEED_128_CBC_SHA256 = { TBD,TBD };
CipherSuite TLS_ECDH_RSA_WITH_SEED_128_CBC_SHA256 = { TBD,TBD };
2.2. GCM-Based Cipher Suites
The next ten cipher suites use the same asymmetric algorithms as
those in the previous section but use the authenticated encryption
modes defined in TLS 1.2 with the SEED in Galois Counter Mode
(GCM)[GCM].
CipherSuite TLS_RSA_WITH_SEED_128_GCM_SHA256 = { TBD,TBD };
CipherSuite TLS_DHE_RSA_WITH_SEED_128_GCM_SHA256 = { TBD,TBD };
CipherSuite TLS_DH_RSA_WITH_SEED_128_GCM_SHA256 = { TBD,TBD };
CipherSuite TLS_DHE_DSS_WITH_SEED_128_GCM_SHA256 = { TBD,TBD };
CipherSuite TLS_DH_DSS_WITH_SEED_128_GCM_SHA256 = { TBD,TBD };
CipherSuite TLS_DH_anon_WITH_SEED_128_GCM_SHA256 = { TBD,TBD };
CipherSuite TLS_ECDHE_ECDSA_WITH_SEED_128_GCM_SHA256 = { TBD,TBD };
CipherSuite TLS_ECDH_ECDSA_WITH_SEED_128_GCM_SHA256 = { TBD,TBD };
CipherSuite TLS_ECDHE_RSA_WITH_SEED_128_GCM_SHA256 = { TBD,TBD };
CipherSuite TLS_ECDH_RSA_WITH_SEED_128_GCM_SHA256 = { TBD,TBD };
Han. et al. Expires December 17, 2011 [Page 4]
INTERNET DRAFT SEED Cipher Suites to TLS June 15, 2011
2.3. PSK Cipher Suites
The next seven cipher suites describe PSK cipher suites. Four cipher
suites use an HMAC and three cipher suites use the SEED Galois
Counter Mode.
CipherSuite TLS_PSK_WITH_SEED_128_CBC_SHA256 = { TBD,TBD };
CipherSuite TLS_DHE_PSK_WITH_SEED_128_CBC_SHA256 = { TBD,TBD };
CipherSuite TLS_RSA_PSK_WITH_SEED_128_CBC_SHA256 = { TBD,TBD };
CipherSuite TLS_PSK_WITH_SEED_128_GCM_SHA256 = { TBD,TBD };
CipherSuite TLS_DHE_PSK_WITH_SEED_128_GCM_SHA256 = { TBD,TBD };
CipherSuite TLS_RSA_PSK_WITH_SEED_128_GCM_SHA256 = { TBD,TBD };
CipherSuite TLS_ECDHE_PSK_WITH_SEED_128_CBC_SHA256 = { TBD,TBD };
3. Cipher Suite Definitions
3.1. Key Exchange
The RSA, DHE_RSA, DH_RSA, DHE_DSS, DH_DSS, DH_anon, ECDH, and ECDHE
key exchanges are performed as defined in [RFC5246].
3.2. Cipher
The SEED_128_CBC cipher suites use SEED [RFC4269] in CBC mode with a
128-bit key and 128-bit Initialization Vector (IV)
AES-authenticated encryption with additional data algorithms,
AEAD_AES_128_GCM is described in [RFC5116]. AES GCM cipher suites for
TLS are described in [RFC5288]. AES and SEED share common
characteristics, including key sizes and block length. SEED_128_GCM
is defined according to those characteristics of AES.
3.3. PRFs
The pseudorandom functions (PRFs) SHALL be as follows:
a. For cipher suites ending with _SHA256, the PRF is the TLS PRF
[RFC5246] using SHA-256 as the hash function.
b. For cipher suites ending with _SHA384, the PRF is the TLS PRF
[RFC5246] using SHA-384 as the hash function.
3.4. PSK Cipher Suites
Pre-shared key cipher suites for TLS are described in [RFC4279],
[RFC4785], [RFC5487], and [RFC5489].
Han. et al. Expires December 17, 2011 [Page 5]
INTERNET DRAFT SEED Cipher Suites to TLS June 15, 2011
4. Security Considerations
At the time of writing this document, no security problem has been
found on SEED. SEED is robust against known attacks, including
differential cryptanalysis, linear cryptanalysis, and related key
attacks, etc. SEED has gone through wide public scrutinizing
procedures. Especially, it has been evaluated and also considered
cryptographically secure by trustworthy organizations such as ISO/IEC
JTC 1/SC 27 and Japan CRYPTREC (Cryptography Research and Evaluation
Committees) [ISOSEED] [CRYPTREC]. SEED has been standardized at
ISO/IEC JTC 1/SC 27 (ISO/IEC 18033-3).
For further security considerations, the reader is encouraged to read
[SEED-EVAL].
The security considerations in the following RFCs apply to this
document as well: [RFC4279] [RFC4785] [RFC5116] [RFC5288] [RFC5289]
[RFC5487] and [GCM].
Han. et al. Expires December 17, 2011 [Page 6]
INTERNET DRAFT SEED Cipher Suites to TLS June 15, 2011
5. IANA Considerations
IANA is requested to allocate the following numbers in the TLS Cipher
Suite Registry:
CipherSuite TLS_RSA_WITH_SEED_128_CBC_SHA256 = { TBD,TBD };
CipherSuite TLS_DH_DSS_WITH_SEED_128_CBC_SHA256 = { TBD,TBD };
CipherSuite TLS_DH_RSA_WITH_SEED_128_CBC_SHA256 = { TBD,TBD };
CipherSuite TLS_DHE_DSS_WITH_SEED_128_CBC_SHA256 = { TBD,TBD };
CipherSuite TLS_DHE_RSA_WITH_SEED_128_CBC_SHA256 = { TBD,TBD };
CipherSuite TLS_DH_anon_WITH_SEED_128_CBC_SHA256 = { TBD,TBD };
CipherSuite TLS_ECDHE_ECDSA_WITH_SEED_128_CBC_SHA256 = { TBD,TBD };
CipherSuite TLS_ECDH_ECDSA_WITH_SEED_128_CBC_SHA256 = { TBD,TBD };
CipherSuite TLS_ECDHE_RSA_WITH_SEED_128_CBC_SHA256 = { TBD,TBD };
CipherSuite TLS_ECDH_RSA_WITH_SEED_128_CBC_SHA256 = { TBD,TBD };
CipherSuite TLS_RSA_WITH_SEED_128_GCM_SHA256 = { TBD,TBD };
CipherSuite TLS_DHE_RSA_WITH_SEED_128_GCM_SHA256 = { TBD,TBD };
CipherSuite TLS_DH_RSA_WITH_SEED_128_GCM_SHA256 = { TBD,TBD };
CipherSuite TLS_DHE_DSS_WITH_SEED_128_GCM_SHA256 = { TBD,TBD };
CipherSuite TLS_DH_DSS_WITH_SEED_128_GCM_SHA256 = { TBD,TBD };
CipherSuite TLS_DH_anon_WITH_SEED_128_GCM_SHA256 = { TBD,TBD };
CipherSuite TLS_ECDHE_ECDSA_WITH_SEED_128_GCM_SHA256 = { TBD,TBD };
CipherSuite TLS_ECDH_ECDSA_WITH_SEED_128_GCM_SHA256 = { TBD,TBD };
CipherSuite TLS_ECDHE_RSA_WITH_SEED_128_GCM_SHA256 = { TBD,TBD };
CipherSuite TLS_ECDH_RSA_WITH_SEED_128_GCM_SHA256 = { TBD,TBD };
CipherSuite TLS_PSK_WITH_SEED_128_CBC_SHA256 = { TBD,TBD };
CipherSuite TLS_DHE_PSK_WITH_SEED_128_CBC_SHA256 = { TBD,TBD };
CipherSuite TLS_RSA_PSK_WITH_SEED_128_CBC_SHA256 = { TBD,TBD };
CipherSuite TLS_PSK_WITH_SEED_128_GCM_SHA256 = { TBD,TBD };
CipherSuite TLS_DHE_PSK_WITH_SEED_128_GCM_SHA256 = { TBD,TBD };
CipherSuite TLS_RSA_PSK_WITH_SEED_128_GCM_SHA256 = { TBD,TBD };
CipherSuite TLS_ECDHE_PSK_WITH_SEED_128_CBC_SHA256 = { TBD,TBD };
Han. et al. Expires December 17, 2011 [Page 7]
INTERNET DRAFT SEED Cipher Suites to TLS June 15, 2011
6. References
6.1 Normative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC4162] Lee, H., Yoon, J., and J. Lee, "Addition of SEED Cipher
Suites to Transport Layer Security (TLS)", RFC 4162,
August 2005.
[RFC4269] Lee, H., Lee, S., Yoon, J., Cheon, D., and J. Lee, "The
SEED Encryption Algorithm", RFC 4269, December 2005.
[RFC4279] Eronen, P., Ed., and H. Tschofenig, Ed., "Pre-Shared Key
Ciphersuites for Transport Layer Security (TLS)",
RFC 4279, December 2005.
[RFC4785] Blumenthal, U. and P. Goel, "Pre-Shared Key (PSK)
Ciphersuites with NULL Encryption for Transport Layer
Security (TLS)", RFC 4785, January 2007.
[RFC5116] McGrew, D., "An Interface and Algorithms for Authenticated
Encryption", RFC 5116, January 2008.
[RFC5246] Dierks, T. and E. Rescorla, "The Transport Layer Security
(TLS) Protocol Version 1.2", RFC 5246, August 2008.
[RFC5288] Salowey, J., Choudhury, A., and D. McGrew, "AES Galois
Counter Mode (GCM) Cipher Suites for TLS", RFC 5288,
August 2008.
[RFC5289] Rescorla, E., "TLS Elliptic Curve Cipher Suites with SHA-
256/384 and AES Galois Counter Mode (GCM)", RFC 5289,
August 2008.
[RFC5487] Badra, M., "Pre-Shared Key Cipher Suites for TLS with SHA-
256/384 and AES Galois Counter Mode", RFC 5487, March
2009.
[RFC5489] Badra, M. and I. Hajjeh, "ECDHE_PSK Cipher Suites for
Transport Layer Security (TLS)", RFC 5489, March 2009.
[GCM] Dworkin, M., "Recommendation for Block Cipher Modes of
Operation: Galois/Counter Mode (GCM) and GMAC", NIST SP
800-38D, November 2007.
Han. et al. Expires December 17, 2011 [Page 8]
INTERNET DRAFT SEED Cipher Suites to TLS June 15, 2011
6.2 Informative References
[Wang05] Wang, X., Yin, Y., and H. Yu, "Finding Collisions in the
Full SHA-1", CRYPTO 2005, LNCS vol.3621, pp.17-36, August
2005.
[TTASSEED] Telecommunications Technology Association (TTA), South
Korea, "128-bit Symmetric Block Cipher (SEED)", TTAS.KO-
12.0004, September 1998, (In Korean)
http://www.tta.or.kr/English/new/main/index.htm
[CRYPTREC] Information-technology Promotion Agency (IPA), Japan,
CRYPTREC. "SEED Evaluation Report", February 2002,
http://seed.kisa.or.kr/seed/down/SEED_Evaluation_Report
_by_CRYPTREC.pdf
[ISO-SEED] ISO/IEC JTC 1/SC 27, "Encryption algorithms - Part 3:
Block ciphers", ISO/IEC 18033-3, December 2010.
[SEED-EVAL] KISA, "Self Evaluation Report",
http://seed.kisa.or.kr/seed/down/SEED_Self_Evaluation-
English.pdf
Authors' Addresses
Byoungjin Han
Korea Internet & Security Agency
IT Venture Tower, Jungdaero 135, Songpa-gu, Seoul, Korea 138-950
Email: labon58@gmail.com, bjhan@kisa.or.kr
Donghoon Shin
Korea Internet & Security Agency
IT Venture Tower, Jungdaero 135, Songpa-gu, Seoul, Korea 138-950
Email: dhshin@kisa.or.kr
Hyuncheol Jeong
Korea Internet & Security Agency
IT Venture Tower, Jungdaero 135, Songpa-gu, Seoul, Korea 138-950
Email: hcjung@kisa.or.kr
Yoojae Won
Korea Internet & Security Agency
IT Venture Tower, Jungdaero 135, Songpa-gu, Seoul, Korea 138-950
Email: yjwon@kisa.or.kr
Han. et al. Expires December 17, 2011 [Page 9]
