SM4_algorithm
SM4 (cipher)
Block cipher used in Chinese wireless standards
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, 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]