Security Evaluation of Generalized CLEFIA-Like Dynamic Cipher Structures Against Differential and Linear Cryptanalysis
Based on the four-branch CLEFIA-like dynamic cipher structure,this paper analyzes the 2m-branch CLE-FIA-like dynamic cipher structure,proving the equivalence between the cyclically permuted transformation-based CLEFIA-like dynamic cipher structure and the CLEFIA cipher structure.Furthermore,the upper bound on the minimum number of differentially active rounds for the 2m-branch CLEFIA-like dynamic cipher structure is investigated.It is demonstrated if each round transformation Pi is the dynamic linear transformation consisting of {0,1} on GF(2s),the upper bound on the minimum number of differentially active rounds for the 2m-branch CLEFIA-like dynamic cipher structure is|22m-1/22m-1mr|,where r denotes the number of rounds.Additionally,the results regarding differential properties can be extended to the lin-ear properties of the CLEFIA-like dynamic cipher structure.
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维普
