Observations on the truncated differential of SP block ciphers and their applications to mCrypton and CRYPTON V1.0
Observations on the truncated differential of SP block ciphers and their applications to mCrypton and CRYPTON V1.0
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DOI：
10.1049/iet-ifs.2017.0196
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发表时间：
2018-04
期刊：
影响因子：
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通讯作者：
D. Yang;Wen-feng Qi;Huajin Chen
中科院分区：
文献类型：
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作者：
D. Yang;Wen-feng Qi;Huajin Chen
Knudsen在Fast Software Encryption 1995 （FSE'95）中提出的截断差分攻击（Truncated differential attack， TDA）在分组密码的分析中得到了广泛的应用。在本研究中，作者专门研究了SP分组密码对TDA的安全性。在FSE'15中，Li等人。
Truncated differential attack (TDA) proposed by Knudsen in Fast Software Encryption 1995 (FSE'95) has been widely used in the analysis of block ciphers. In this study, the authors specifically study the security of SP block ciphers against TDA. In FSE'15, Li et al.
introduced a meet-in-the-middle technique to construct truncated differential for Feistel ciphers. They first apply Li's technique to SP block ciphers and get some further results. Second, they introduce the concept of generalised truncated difference to control the diffusion of active S-boxes in the truncated differential. On the basis of these, two 5-round truncated differential distinguishers for mCrypton and CRYPTON V1.0 have been constructed. Using these two 5-round distinguishers, they present the first 8-round DA on mCrypton-64 and improve the former best TDA on CRYPTON V1.0 by one round.