SM4 (cipher)

"SMS4" redirects here. For the satellite, see Synchronous Meteorological Satellite.
SM4
General
DesignersData Assurance & Communication Security Center, Chinese Academy of Sciences
First published2006 (declassified; standardized March 21, 2012)[1]
Cipher detail
Key sizes128 bits
Block sizes128 bits
Structureunbalanced Feistel network
Rounds32
Best public cryptanalysis
Linear and differential attacks against 22 rounds

ShāngMì 4 (SM4, 商密4) (formerly SMS4)[2] is a block cipher used in the Chinese National Standard for Wireless LAN WAPI (WLAN Authentication and Privacy Infrastructure) and also used with Transport Layer Security.[3]

SM4 was a cipher proposed for the IEEE 802.11i standard, but it has so far been rejected. One of the reasons for the rejection has been opposition to the WAPI fast-track proposal by the IEEE.[citation needed]

SM4 was published as ISO/IEC 18033-3/Amd 1 in 2021.

The SM4 algorithm was drafted by Data Assurance & Communication Security Center, Chinese Academy of Sciences (CAS), and Commercial Cryptography Testing Center, National Cryptography Administration. It is mainly developed by Lü Shuwang (Chinese: 吕述望). The algorithm was declassified in January, 2006, and it became a national standard (GB/T 32907-2016) in August 2016.[4]

  1. ^ "SM4 Block Cipher Algorithm". CNNIC. 2013-12-04. Archived from the original on 2016-09-19. Retrieved 2016-07-24.
  2. ^ "Announcement No.23 of the State Cryptography Administration" (in Chinese (China)). The Office of Security Commercial Code Administration (OSCCA). 2012-03-21. Archived from the original on 2016-08-14. Retrieved 2016-07-24.
  3. ^ Yang, P (March 2021). RFC 8998. IETF. doi:10.17487/RFC8998. Retrieved 2022-07-30.
  4. ^ Lu Shuwang. Overview on SM4 Algorithm[J]. Journal of Information Security Research, 2016, 2(11): 995-1007.