一類(lèi)廣義Feistel密碼的安全性評(píng)估
Security evaluation for a class of generalized feistel ciphers
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摘要: 該文評(píng)估一類(lèi)廣義Feistel密碼(GFC)抵抗差分和線性密碼分析的能力:如果輪函數(shù)是雙射且它的最大差分和線性特征的概率分別是p和q,則16輪GFC的差分和線性特征的概率的上界為p7和q7;如果輪函數(shù)采用SP結(jié)構(gòu)且是雙射,S盒的最大差分和線性特征的概率是ps和qs,P變換的分支數(shù)為Pd,則16輪GFC的差分和線性特征的概率的上界為(ps)3Pd+1和(qs)3Pd+1。
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關(guān)鍵詞:
- 差分密碼分析; 線性密碼分析; 分支數(shù); 密碼; S盒
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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