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Internet Engineering Task Force (IETF)                          J. JeongRequest for Comments: 5748                                        H. KimCategory: Informational                                         H. JeongISSN: 2070-1721                                                   Y. Won                                        Korea Internet & Security Agency                                                             August 2010IANA Registry Update for Support of the SEED Cipher Algorithm inMultimedia 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; seeSection 2 of RFC 5741.   Information about the current status of this document, any errata,   and how to provide feedback on it may be obtained athttp://www.rfc-editor.org/info/rfc5748.Copyright Notice   Copyright (c) 2010 IETF Trust and the persons identified as the   document authors.  All rights reserved.   This document is subject toBCP 78 and the IETF Trust's Legal   Provisions Relating to IETF Documents   (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.Jeong, et al.                 Informational                     [Page 1]

RFC 5748                       MIKEY_SEED                    August 2010Table of Contents1. Introduction ....................................................21.1. SEED .......................................................22. Additions to MIKEY Payload ......................................22.1. Modified Table 6.10.1.b fromRFC 3830 ......................32.2. Modified Table 6.10.1.d fromRFC 3830 ......................33. Security Considerations .........................................34. IANA Considerations .............................................35. Acknowledgements ................................................36. References ......................................................46.1. Normative References .......................................46.2. Informative References .....................................41.  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].Jeong, et al.                 Informational                     [Page 2]

RFC 5748                       MIKEY_SEED                    August 20102.1.  Modified Table 6.10.1.b fromRFC 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 fromRFC 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 inSection 2 of the   MIKEY [RFC3830] Payload Name registry according to Sections2.1 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.Jeong, et al.                 Informational                     [Page 3]

RFC 5748                       MIKEY_SEED                    August 20106.  References6.1.  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.jspJeong, et al.                 Informational                     [Page 4]

RFC 5748                       MIKEY_SEED                    August 2010Authors' 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.krJeong, et al.                 Informational                     [Page 5]