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

descriptionPublicationkeyboard_double_arrow_right Part of book or chapter of book , Conference object , Article 01 Jan 2005 Belgium Publisher:Springer Berlin Heidelberg

Authors: Changhoon Lee; Jongsung Kim; Seokhie Hong; Jaechul Sung; Sangjin Lee 0002;

doi: 10.1007/11554868_18

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

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Abstract

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.

Country

Belgium

Related Organizations

Seoul National University
Korea (Republic of)
University of Seoul
Korea (Republic of)
KU Leuven
Belgium
Center for Information Security Technologies
Katholieke Universiteit Leuven
Belgium

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Keywords

data-dependent permutation, Technology, Science & Technology, Computer Science, Information Systems, Cobra-F64, related-key attack, block cipher, SPECTR-H64, cosic, CIKS-1, CRYPTANALYSIS, CIPHERS, Computer Science, Theory & Methods, Cobra-S128, Computer Science

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