1. SEED Updates March 2, 2004 Jongwook Park, KISA - SEED Encryption Algorithm - Use of the SEED Encryption Algorithm in CMS

2. Status 2 documents on SEED are currently posted in repository –The SEED Encryption Algorithm (SEED) –Use of the SEED Encryption Algorithm in CMS (CMS-SEED) SEED –Proposed as an informational RFC –Available at http://www.ietf.org/internet-drafts/draft-park-seed- 00.txthttp://www.ietf.org/internet-drafts/draft-park-seed- 00.txt –Would be a normative reference to CMS-SEED –Further information such as source code and test vectors can be gotten at http://www.kisa.or.kr/seed/seed_eng.htmlhttp://www.kisa.or.kr/seed/seed_eng.html CMS-SEED –Posted in October 2003 –Available at http://www.ietf.org/internet-drafts/draft-park-cms- seed-00.txthttp://www.ietf.org/internet-drafts/draft-park-cms- seed-00.txt

3. SEED Overview Characteristics –Feistel structure with 16 rounds –128-bit input/output data block size –128-bit key length –Robust against known attacks such as DC, LC and key related attacks –Effectively implemented in software as well as hardware –Licensing or royalty payments are not required Korean national-recommended algorithm –Mandatory in most area in Korea Feedback from ISO/IEC JTC1/SC27 –No shortcomings in the strength of the algorithm are found –SEED OID is defined in ISO/IEC 9594-8 iso(1) standard(0) encryption-algorithms(18033) part(3) cipher-128-bit (2) seed(3) –Currently selected official block ciphers Accepted : 3DES, AES, MISTY, Camellia Rejected : IDEA, Khazad TBD : SEED, CAST128 (Determined by this coming April)

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