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ShāngMì 4 (SM4, 商密4) (formerly SMS4) is a block cipher, standardised for commercial cryptography in China. It is used in the Chinese National Standard for Wireless LAN WAPI (WLAN Authentication and Privacy Infrastructure), and with Transport Layer Security.
History & Standards
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sm4 chinese cipher standard block security key encryption national keys round algorithm s-box wapi ieee published data displaystyle sms4 used
| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| SM4 (cipher) | Block sizes | 128 bits | 1.00 | infobox |
| SM4 (cipher) | Designers | Data Assurance & Communication Security Center, Chinese Academy of Sciences | 1.00 | infobox |
| SM4 (cipher) | First published | 2006 (declassified; standardized March 21, 2012) | 1.00 | infobox |
| SM4 (cipher) | Key sizes | 128 bits | 1.00 | infobox |
| SM4 (cipher) | Rounds | 32 | 1.00 | infobox |
| SM4 (cipher) | Structure | Unbalanced Feistel network | 1.00 | infobox |
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