SM4 (cipher)

SM4
General
Designers	Data Assurance & Communication Security Center, Chinese Academy of Sciences
First published	2006 (declassified; standardized March 21, 2012)
Cipher detail
Key sizes	128 bits
Block sizes	128 bits
Structure	unbalanced Feistel network
Rounds	32
Best public cryptanalysis
	Linear and differential attacks against 22 rounds

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

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.^[5]

^ "SM4 Block Cipher Algorithm". CNNIC. 2013-12-04. Archived from the original on 2016-09-19. Retrieved 2016-07-24.
^ "Announcement No.23 of the State Cryptography Administration" (in Chinese (China)). The Office of the State Commercial Code Administration (OSCCA). 2012-03-21. Archived from the original on 2016-08-14. Retrieved 2016-07-24.
^ Martinkauppi, Louise Bergman; He, Qiuping; Ilie, Dragos (June 2020). "On the Design and Performance of Chinese OSCCA-approved Cryptographic Algorithms". 2020 13th International Conference on Communications (COMM). pp. 119–124. doi:10.1109/COMM48946.2020.9142035. ISBN 978-1-7281-5611-8. S2CID 220668639.
^ Yang, P (March 2021). RFC 8998. IETF. doi:10.17487/RFC8998. Retrieved 2022-07-30.
^ Lu Shuwang. Overview on SM4 Algorithm[J]. Journal of Information Security Research, 2016, 2(11): 995-1007.

[1] "SM4 Block Cipher Algorithm". CNNIC. 2013-12-04. Archived from the original on 2016-09-19. Retrieved 2016-07-24.

[oscca_1228-2] "Announcement No.23 of the State Cryptography Administration" (in Chinese (China)). The Office of the State Commercial Code Administration (OSCCA). 2012-03-21. Archived from the original on 2016-08-14. Retrieved 2016-07-24.

[3] Martinkauppi, Louise Bergman; He, Qiuping; Ilie, Dragos (June 2020). "On the Design and Performance of Chinese OSCCA-approved Cryptographic Algorithms". 2020 13th International Conference on Communications (COMM). pp. 119–124. doi:10.1109/COMM48946.2020.9142035. ISBN 978-1-7281-5611-8. S2CID 220668639.

[4] Yang, P (March 2021). RFC 8998. IETF. doi:10.17487/RFC8998. Retrieved 2022-07-30.

[abstract192-5] Lu Shuwang. Overview on SM4 Algorithm[J]. Journal of Information Security Research, 2016, 2(11): 995-1007.

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