Internet Engineering Task Force (IETF)                          J. Jeong
Request for Comments: 5748                                        H. Kim
Category: Informational                                         H. Jeong
ISSN: 2070-1721                                                   Y. Won
                                        Korea Internet & Security Agency
                                                             August 2010


    IANA Registry Update for Support of the SEED Cipher Algorithm in
                   Multimedia Internet KEYing (MIKEY)

Abstract

   This document updates IANA registries to support the SEED block
   cipher algorithm for the Secure Real-time Transport Protocol (SRTP)
   and the secure Real-time Transport Control Protocol (SRTCP) in
   Multimedia Internet KEYing (MIKEY).

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for informational purposes.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Not all documents
   approved by the IESG are a candidate for any level of Internet
   Standard; see Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc5748.

Copyright Notice

   Copyright (c) 2010 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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   described in the Simplified BSD License.

Table of Contents

   1. Introduction ....................................................2
      1.1. SEED .......................................................2
   2. Additions to MIKEY Payload ......................................2
      2.1. Modified Table 6.10.1.b from RFC 3830 ......................3
      2.2. Modified Table 6.10.1.d from RFC 3830 ......................3
   3. Security Considerations .........................................3
   4. IANA Considerations .............................................3
   5. Acknowledgements ................................................3
   6. References ......................................................4
      6.1. Normative References .......................................4
      6.2. Informative References .....................................4

1.  Introduction

   This document updates IANA registries to support the SEED [RFC4269]
   block cipher algorithm for the Secure Real-time Transport Protocol
   (SRTP) and the Secure Real-time Transport Control Protocol (SRTCP)
   [RFC3711] in Multimedia Internet KEYing (MIKEY) [RFC3830].

1.1.  SEED

   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.

   SEED is a Korean National Industrial Association standard and is
   widely used in South Korea for electronic commerce and various
   security products such as firewalls, VPNs, and so on.

2.  Additions to MIKEY Payload

   This section specifies new code points for the MIKEY [RFC3830]
   payload to indicate the use of the SEED cipher algorithm for SRTP and
   SRTCP.  There are three applicable modes of running SEED: SEED in
   Counter Mode (SEED-CTR), SEED in Counter with CBC-MAC Mode (SEED-
   CCM), and SEED in Galois/Counter Mode (SEED-GCM) Mode.  These are
   defined in [RFC5669].

2.1.  Modified Table 6.10.1.b from RFC 3830

   IANA has amended the sub-registry derived from Table 6.10.1.b of
   [RFC3830] as follows:

               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)

2.2.  Modified Table 6.10.1.d from RFC 3830

   IANA has amended the sub-registry derived from Table 6.10.1.d of
   [RFC3830] as follows:

               SRTP PRF      | Value
               ---------------------
               AES-CM        |     0
               SEED-CTR      |     1 (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 only known attack is an
   exhaustive search for the key.  For further security considerations,
   the reader is encouraged to read [SEED-EVAL].

4.  IANA Considerations

   IANA has amended the indicated sub-registries in Section 2 of the
   MIKEY [RFC3830] Payload Name registry according to Sections 2.1 and
   2.2 above.

5.  Acknowledgements

   The authors would like to thank David McGrew, Spencer Dawkins,
   SangHwan Park, Brian Weis, and Tim Polk for their reviews and
   support.

6.  References

6.1.  Normative References

   [RFC3711]   Baugher, M., McGrew, D., Naslund, M., Carrara, E., and K.
               Norrman, "The Secure Real-time Transport Protocol
               (SRTP)", RFC 3711, March 2004.

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

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

   [RFC5669]   Yoon, S., Kim, J., Park, H., Jeong, H., and Y. Won, "The
               SEED Cipher Algorithm and Its Use with the Secure Real-
               Time Transport Protocol (SRTP)", RFC 5669, August 2010.

6.2.  Informative References

   [SEED-EVAL] KISA, "Self Evaluation Report",
               http://seed.kisa.or.kr/eng/main.jsp

Authors' Addresses

   Seokung Yoon
   Korea Internet & Security Agency
   IT Venture Tower, Jungdaero 135, Songpa-gu
   Seoul, Korea 138-950
   EMail: seokung@kisa.or.kr

   Jongil Jeong
   Korea Internet & Security Agency
   IT Venture Tower, Jungdaero 135, Songpa-gu
   Seoul, Korea 138-950
   EMail: jijeong@kisa.or.kr

   Hwankuk Kim
   Korea Internet & Security Agency
   IT Venture Tower, Jungdaero 135, Songpa-gu
   Seoul, Korea 138-950
   EMail: rinyfeel@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