基于混沌的双模块Feistel结构高安全性高速分组密码算法安全性分析

Security Analysis of Block Cipher CFE

该文对基于混沌的双模块Feistel结构(CFE)高安全性高速分组算法的安全性进行了分析。分析结果表明,算法不适合用积分攻击、中间相遇攻击、不变量攻击、插值攻击和循环移位攻击分析其安全性;可以抵抗相关密钥攻击;更进一步地构造出了5轮不可能差分特征链,并利用其进行区分攻击;求得算法的活性S盒下界为6,概率约为2–21;算法存在5轮零相关线性特征。

The security of high security and high speed block cipher algorithm of two-module FEistel structure based on Chaos(CFE)is analyzed.The results show that the cipher is not suitable to use integral attack,meat-in-the-middle attack,invariant attack,interpolation attack and circle shift attack to analyze its security.And it can resist the related-key attack.Furthermore,5 rounds of impossible differential characteristic are constructed and used to distinguish attacks.The lower bound of the active S-box is 6,and the probability is about 2–21.There are 5 rounds of linear characteristic with zero-correlation.