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Versions: 00                                                            
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
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   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
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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



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   (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





















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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].






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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 };













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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].





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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].

































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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 };















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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.





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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




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