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Provable Security for an RC6-like Structure and a MISTY-FO-like Structure Against Differential Cryptanalysis
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Workshop on Applied Cryptography and Information Security (ACIS 2006)
Provable Security for an RC6-like Structure and a MISTY-FO-like Structure Against Differential Cryptanalysis
Changhoon Lee1  , Jongsung Kim1, 2 , Jaechul Sung3 , Seokhie Hong1 and Sangjin Lee1
| (1) |
Center for Information Security Technologies(CIST), Korea University, Anam Dong, Sungbuk Gu, Seoul, Korea |
| (2) |
Katholieke Universiteit Leuven, ESAT/SCD-COSIC, Belgium |
| (3) |
Department of Mathematics, University of Seoul, 90, Cheonnong Dong, Dongdaemun Gu, Seoul, Korea |
Abstract
In this paper we introduce two new block cipher structures, named RC6-like structure and MISTY-FO-like structure, and show that these structures are provably resistant against differential attack. The main results of this paper are that
the 5-round differential probabilities of these structures are upperbounded by p4+2 p5 and p4, respectively, if the maximum differential probability of a round function is p. We also discuss a provable security for the RC6-like structure against LC. Our results are attained under the assumption
that all of components in our proposed structures are bijective.
Keywords: Provable Security, Differential Cryptanalysis, Linear Cryptanalysis, RC6, MISTY, Feistel Network.
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