一类广义Feistel密码的安全性评估
Security evaluation for a class of generalized feistel ciphers
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摘要: 该文评估一类广义Feistel密码(GFC)抵抗差分和线性密码分析的能力:如果轮函数是双射且它的最大差分和线性特征的概率分别是p和q,则16轮GFC的差分和线性特征的概率的上界为p7和q7;如果轮函数采用SP结构且是双射,S盒的最大差分和线性特征的概率是ps和qs,P变换的分支数为Pd,则16轮GFC的差分和线性特征的概率的上界为(ps)3Pd+1和(qs)3Pd+1。Abstract: This paper studies the security evaluation against differential and linear attacks for a class of generalized Feistel ciphers. If the round function is bijective and its maximum differential and linear characteristic probabilities are p and q, then the upper bounds of maximum differential and linear characteristic probabilities for 16-round ciphers are p7 and q7. If the round function is bijective and SP structure, the maximum differential and linear characteristic probabilities of S-boxes are pS and qS, the branch number of P is Pd, then the upper bounds of maximum differential and linear characteristic probabilities for 16-round ciphers are (pS)3Pd+1 and (qS)3Pd+1.
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