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A peculiar higher order differential of CLEFIA

机译:CLEFIA的特殊高阶微分

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摘要

CLEFIA is a 128-bit block cipher proposed by Shirai et al. in 2007. In this paper, we focused on a higher order differential of CLEFIA. It has been reported that CLEFIA has 6-round saturation characteristics using 32-nd order differential. This paper introduces two new concepts for higher order differential (HOD) which are control transform for the input and observation transform for the output. With these concepts, we found a new 6-round HOD characteristic using 8-th order differential. By close examination of byte-value, we found the reason for this HOD. If we use the new HOD characteristic, instead of 32-nd order differential for the attack to 7-round CLEFIA, we can reduce to data and computational complexity around 2−23, 2−15 of the conventional one, respectively.
机译:CLEFIA是Shirai等人提出的128位块密码。在2007年。本文重点研究CLEFIA的高阶微分。据报道,CLEFIA具有使用32阶差分的6轮饱和特性。本文介绍了两个用于高阶微分(HOD)的新概念,分别是输入的控制变换和输出的观察变换。通过这些概念,我们发现了使用8阶微分的6轮HOD新特性。通过仔细检查字节值,我们找到了此HOD的原因。如果我们使用新的HOD特性,而不是32位差分来攻击7轮CLEFIA,我们可以将数据和计算复杂度降低到2 −23 ,2 −15 分别。

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