Internet Engineering Task Force (IETF)
Request for Comments: 5748
Category: Informational
ISSN: 2070-1721

J. Jeong
H. Kim
H. Jeong
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

This document is subject to BCP 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.

   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