SMS4分组密码算法的差分—代数分析

分组密码中最有效、最常用的分析方法是差分分析,而代数攻击分析也是分析分组密码的分析方法之一,其弱点是轮数越多,方程的数目也会越多,方程求解会更加困难.将两种方法结合起来,弥补了各自的不足与繁琐,分析更为有效.在深入分析SMS4分组密码算法特征的基础上,将差分—代数分析方法结合起来对SMS4分组密码算法进行分析,并通过对20轮的SMS4分组密码进行实证分析,说明了差分—代数分析方法用于分组密码分析的有效性.

Differential-Algebraic Analysis of SMS4 Block Cipher Algorithm

Differential analysis is the most effective and commonly used analysis method in block cipher.Algebraic attack is also one of analysis method for block cipher analysis.Its weakness is that the more rounds it has,the more number of equations and the solving equations will be more difficult.The combination of these two methods will make up for their deficiencies and trivialities only to make the analysis more efficient.Based on in-depth analysis of SMS4 cryptographic algorithm characteristics,differential-algebraic analysis method is combined to analyze SMS4 cryptographic algorithms.The findings of 20 round SMS4’s empirical analysis proves the validity of differential-algebraic analysis method used for block cipher analysis.