文章基本信息

标题：Practical and Provable Security against Differential and Linear Cryptanalysis for Substitution-Permutation Networks
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作者：Kang, Ju-Sung ; Hong, Seok-Hie ; Lee, Sang-Jin 等
期刊名称：ETRI Journal
印刷版ISSN：1225-6463
电子版ISSN：2233-7326
出版年度：2001
卷号：23
期号：4
页码：158-158
语种：English
出版社：Electronics and Telecommunications Research Institute
摘要：We examine the diffusion layers of some block ciphers referred to as substitution-permutation networks. We investigate the practical and provable security of these diffusion layers against differential and linear cryptanalysis. First, in terms of practical security, we show that the minimum number of differentially active S-boxes and that of linearly active S-boxes are generally not identical and propose some special conditions in which those are identical. We also study the optimal diffusion effect for some diffusion layers according to their constraints. Second, we obtain the results that the consecutive two rounds of SPN structure provide provable security against differential and linear cryptanalysis, i.e., we prove that the probability of each differential (resp. linear hull) of the consecutive two rounds of SPN structure with a maximal diffusion layer is bounded by and that of each differential (resp. linear hull) of the SDS function with a semi-maximal diffusion layer is bounded by , where p and q are maximum differential and linear probabilities of the substitution layer, respectively.