论文部分内容阅读
In this paper,for the unbalanced Feistel network which employs diffusion matrices in a switching way,we study the fixed number of its differential active S-boxes.Firstly we obtain some lower bounds of the differential active S-boxes for m,2m and 3m rounds of Feistel structure,respectively.By concatenating these rounds,a fixed number of differential active S-boxes for arbitrary round number is derived.Our results imply that the unbalanced Feistel network using DSM is more secure than the traditional structure.
In this paper, for the unbalanced Feistel network which offers diffusion matrices in a switching way, we study the fixed number of its differential active S-boxes. Firstly we obtain some lower bounds of the differential active S-boxes for m, 2m and 3m rounds of Feistel structure, respectively.By concatenating these rounds, a fixed number of differential active S-boxes for arbitrary round number is derived.Our results imply that the unbalanced Feistel network using DSM is more secure than the traditional structure.