四分组类CLEFIA变换簇抵抗差分密码分析的安全性评估

Security Evaluation Against Differential Cryptanalysis for Four-Block CLEFIA-Like Transform Cluster

差分密码分析是针对分组密码的强有力的攻击方法,估计分组密码抵抗差分密码分析的能力是分组密码安全性评估的重要内容之一.基于实际应用背景,提出了"四分组类CLEFIA变换簇"的概念,并利用变换簇中两种特殊分组密码结构的差分对应之间的关系,给出了变换簇中所有密码结构抵抗差分密码分析的安全性评估结果.

Differential cryptanalysis is a powerful attack on block ciphers and to evaluate the security against differential cryptanalysis is an important part for the security evaluation of block ciphers. Based on practical application background,the concept of four-block CLEFIA-like transform cluster is put forward. Using the relation between differential correspondences of two special block cipher structures,security evaluation against differential cryptanalysis for all block cipher structures of the cluster is given.