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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