嵌套代替-扩散网络的CLEFIA结构零相关线性逼近的构造
doi: 10.3724/SP.J.1146.2011.00475
Construction of Zero-correlation Linear Hull for CLEFIA-like Structure with SPN Round Functions
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摘要: 零相关线性分析是一种新的分组密码分析方法。进行零相关线性分析首先需要构造相关系数为0的线性逼近。该文研究了嵌套代替-扩散(SP)的CLEFIA结构相关系数为0的线性逼近构造问题，给出了该结构的一类新的(4n+1)轮零相关线性逼近的构造算法。利用该方法可以给出9轮CLEFIA算法的大量零相关线性逼近。Abstract: Zero-correlation linear cryptanalysis is a newly proposed attack of block ciphers. The first step of this cryptanalysis is to construct a zero-correlation linear hull whose correlation value is 0. This paper investigates the construction of zero-correlation linear hull for CLEFIA-like structure with Substitution-Permutation (SP)-type round function. And a new method of finding (4n+1) round zero-correlation linear hull of this structure is proposed. By the proposed method, large amount of zero-correlation linear hulls of 9 round CLEFIA are obtained.
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Key words:
- Block cipher /
- CLEFIA-like structure /
- Zero-correlation linear hull /
- Diffusion structure
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