Related-Key Differential Attacks on Cobra-S128, Cobra-F64a, and Cobra-F64b | Zendy

Changhoon Lee | Zendy; Jongsung Kim | Zendy; Seokhie Hong | Zendy; Jaechul Sung | Zendy; Sangjin Lee | Zendy

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Related-Key Differential Attacks on Cobra-S128, Cobra-F64a, and Cobra-F64b

Author(s) -

Changhoon Lee,

Jongsung Kim,

Seokhie Hong,

Jaechul Sung,

Sangjin Lee

Publication year - 2005

Publication title -

lecture notes in computer science

Language(s) - English

Resource type - Book series

SCImago Journal Rank - 0.249

H-Index - 400

eISSN - 1611-3349

pISSN - 0302-9743

ISBN - 3-540-28938-0

DOI - 10.1007/11554868_18

Subject(s) - cobra , computer science , block cipher , key (lock) , naja , serpent (symbolism) , firmware , cryptography , computer security , operating system , programming language , biology , ecology , history , archaeology , venom

Data-dependent permutations (DDPs) which are very suitable for cheap hardware implementations have been introduced as a cryptographic primitive. Cobra-S128 and Cobra-F64 (which is a generic name for Cobra-F64a and Cobra-F64b) are 128-bit and 64-bit iterated block ciphers with a 128-bit key size based on such DDPs, respectively. Unlike the predecessor DDP-based ciphers [16,5], Cobra-S128 is a software-oriented cipher and Cobra-F64 is a firmware-suitable cipher. In this paper, we derive several structural properties of Cobra-S128 and Cobra-F64 and then use them to devise key recovery attacks on Cobra-S128 and Cobra-F64. These works are the first known attacks on Cobra-S128 and Cobra-F64.

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