CLEFIA
Block cipher
From Wikipedia, the free encyclopedia
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.
| General | |
|---|---|
| Designers | Sony |
| First published | 2007 |
| Certification | CRYPTREC (Candidate) |
| Cipher detail | |
| Key sizes | 128, 192, or 256 bits |
| Block sizes | 128 bits |
| Structure | Feistel network |
| Rounds | 18, 22, or 26 |
| Best public cryptanalysis | |
| An improbable differential attack requiring 2126.83 chosen plaintexts breaks 13 rounds with a complexity of 2126.83 encryptions for the key size of length 128 bits (Tezcan, 2010).[1] Similar attacks apply for 14 and 15 rounds of CLEFIA for the key sizes 192 and 256 bits, respectively. | |
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]
