CLEFIA information

CLEFIA
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). Similar attacks apply for 14 and 15 rounds of CLEFIA for the key sizes 192 and 256 bits, respectively.

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 bit. 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.

^ Tezcan, Cihangir. "The Improbable Differential Attack: Cryptanalysis of Reduced-Round CLEFIA". Proceedings of INDOCRYPT, 2010. Lecture Notes in Computer Science. Springer-Verlag. Archived from the original on 2013-02-03.
^ "Sony Develops "CLEFIA" - New Block Cipher Algorithm Based on State-of-the-art Design Technologies". Retrieved 2007-03-26.

[clefia-cryptanalysis-1] Tezcan, Cihangir. "The Improbable Differential Attack: Cryptanalysis of Reduced-Round CLEFIA". Proceedings of INDOCRYPT, 2010. Lecture Notes in Computer Science. Springer-Verlag. Archived from the original on 2013-02-03.

[PressRelease-2] "Sony Develops "CLEFIA" - New Block Cipher Algorithm Based on State-of-the-art Design Technologies". Retrieved 2007-03-26.

CLEFIA information

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CLEFIA

Feistel cipher

Cryptography

CRYPTREC

Advanced Encryption Standard

Block cipher mode of operation

Initialization vector

Avalanche effect

Timing attack

Data Encryption Standard

AES implementations

Commercial National Security Algorithm Suite

Triple DES

SAVILLE

CCM mode

REDOC

KHAZAD

Block cipher

RC6

Twofish

Ciphertext stealing