CLEFIA is a proprietary block cipher algorithm, developed by Sony.[2] Its name is derived from the French word clef, meaning “key”. The block size is 128-bits, and the key size can be 128-bit, 192-bit or 256-bits. It is intended to be used in DRM systems. It is among the cryptographic techniques recommended candidate for Japanese government use by CRYPTREC revision in 2013.
Standardization
CLEFIA is included in the following standards.
- ISO/IEC 29192-2:2019, Information security – Lightweight cryptography – Part 2: Block ciphers[3]
- RFC 6114[4]
References
- ^ Tezcan, Cihangir. “The Improbable Differential Attack: Cryptanalysis of Reduced-Round CLEFIA”. Proceedings of INDOCRYPT, 2010. Lecture Notes in Computer Science. Springer-Verlag.
{{cite book}}: CS1 maint: deprecated archival service (link) - ^ “Sony Develops “CLEFIA” – New Block Cipher Algorithm Based on State-of-the-art Design Technologies”. Retrieved 26 March 2007.
- ^ “ISO/IEC 29192-2:2019, Information security – Lightweight cryptography – Part 2: Block ciphers“.
- ^ “Sony Corporation – CLEFIA – Standardization – IETF”. www.sony.co.jp. Archived from the original on 16 January 2026. Retrieved 6 March 2026.
Further reading
- Wao Wang; Xiaoyun Wang (12 December 2007). “Improved Impossible Differential Cryptanalysis of CLEFIA”. Retrieved 25 October 2010.
- Cihangir Tezcan (8 August 2010). “The Improbable Differential Attack: Cryptanalysis of Reduced Round CLEFIA”. Retrieved 25 October 2010.
External links
- CLEFIA website
- 256bit Ciphers – CLEFIA Reference implementation and derived code
- Sony Introduces CLEFIA
- Implementation of 128-bit CLEFIA codec and hash function
