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Versions: 00 01 02 03 04 05 RFC 5748

MSEC Working Group                                             S. Yoon
Internet Draft                                                H. Jeong
Expires: September 4, 2009                                      Y. Won
                                     Korea Information Security Agency
                                                         March 4, 2009


     Addition of the new values to use the SEED Cipher Algorithm in the
                    Multimedia Internet KEYing (MIKEY)
                     draft-seokung-msec-mikey-seed-00


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Abstract

   This document proposes the addition of new values to use the SEED
   block cipher algorithm for the Secure Real-time Transport Protocol
   (SRTP) and the Real-time Transport Control Protocol (RTCP) in
   Multimedia Internet KEYing (MIKEY).

Table of Contents


   1. Introduction..................................................3
      1.1. SEED.....................................................3
      1.2. Terminology..............................................3
   2. Additions to MIKEY payload....................................3
      2.1. Modified Table 6.10.1.b from [RFC3830]...................3
      2.2. Modified Table 6.10.1.d from [RFC3830]...................4
   3. Security Considerations.......................................4
   4. IANA Considerations...........................................4
   5. References....................................................5
      5.1. Normative References.....................................5
      5.2. Informative References...................................5
   Author's Addresses...............................................6



























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1. Introduction

1.1. SEED

   SEED [RFC4269] is a Korean National Industrial Association standard
   [TTASSEED] and is widely used in South Korea for electronic commerce
   and financial services that are operated on wired and wireless
   communications.

   SEED is a 128-bit symmetric key block cipher that has been developed
   by KISA (Korea Information Security Agency) and a group of experts
   since 1998. The input/output block size of SEED is 128-bit and the
   key length is also 128-bit. SEED has a 16-round Feistel structure.

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 [RFC2119].

2. Additions to [RFC3830] payload

   This section specifies the new values to use the SEED cipher
   algorithm for SRTP and SRTCP [I-D.ietf-avt-seed-srtp].

2.1. Modified Table 6.10.1.b from [RFC3830]

   For the Encryption algorithm, a one byte length is enough. The
   currently defined possible values are:

   SRTP encr alg | Value
   ---------------------
   NULL          |     0
   AES-CM        |     1
   AES-F8        |     2
   SEED-CTR      |     3 (NEW)
   SEED-CCM      |     4 (NEW)
   SEED-GCM      |     5 (NEW)

   Figure 1: Table 6.10.1.b from [RFC3830] (Revised)









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2.2. Modified Table 6.10.1.d from [RFC3830]

   For the SRTP pseudo-random function, a one byte length is also
   enough. The currently defined possible values are:

   SRTP PRF      | Value
   ---------------------
   AES-CM        |     1
   SEED-CTR      |     2 (NEW)

   Figure 2: Table 6.10.1.d from [RFC3830] (Revised)

3. Security Considerations

   No security problem has been found on SEED. SEED is secure against
   all known attacks including Differential cryptanalysis, linear
   cryptanalysis, and related key attacks. The best known attack is only
   an exhaustive search for the key. For further security
   considerations, the reader is encouraged to read [SEED-EVAL].

4. IANA Considerations

   In order to align Figure 1 with Table 6.10.1.b in [RFC3830] and
   Figure 2 with Table 6.10.1.d in [RFC3830], IANA is requested to add
   the values described in Section 2 to their MIKEY Payload Name Space.
























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5. References

5.1. Normative References

    [I-D.ietf-avt-seed-srtp]
               S. Yoon, J. Kim, H. Park, H. Jeong, Y. Won, "The SEED
               Cipher Algorithm and Its Use with the Secure Real-time
               Transport Protocol (SRTP), draft-ietf-avt-seed-srtp-09
               (work in progress), February 2009.

   [RFC2119]   Bradner, S., "Key words for use in RFCs to Indicate
               Requirement Levels", BCP 14, RFC 2119, March 1997.

   [RFC3830]   Arkko, J., Carrara, E., Lindholm, F., Naslund, M., and K.
               Norrman, "MIKEY: Multimedia Internet KEYing", RFC 3830,
               August 2004.

   [RFC4269]   H. Lee, S. Lee, J. Yoon, D. Cheon, J. Lee, "The SEED
               Encryption Algorithm", RFC 4269, December 2005.

5.2. Informative References

   [SEED-EVAL] KISA, "Self Evaluation Report",
               http://www.kisa.or.kr/kisa/seed/data/Document_pdf/SEED_Ev
               aluation_Report_by_CRYPTREC.pdf

   [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



















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Author's Addresses

   Seokung Yoon
   Korea Information Security Agency
   78, Karak-dong, Songpa-Gu, Seoul, KOREA
   Email: seokung@kisa.or.kr


   Hyuncheol Jeong
   Korea Information Security Agency
   78, Karak-dong, Songpa-Gu, Seoul, KOREA
   Email: hcjung@kisa.or.kr


   Yoojae Won
   Korea Information Security Agency
   78, Karak-dong, Songpa-Gu, Seoul, KOREA
   Email: yjwon@kisa.or.kr































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