分组密码对称置换算法设计*

证明了对称置换的圈结构与计数，提出并设计了一种以特定对称结构作为分组密码算法的置换部分，以减小加密算法硬件空间，提高加/解密速度。指出了分组密码的多次迭代使对称置换结构复杂化，可以选择对称置换作为分组密码算法的扩散部分来设计。

Symmetrical Permutation Design in Block Cipher Algorithm

It proves the symmetrical permutation's circle structure and it's count.It puts forward and designs the certain symmetrical permutation that made block cipher algorithm's hardware space decrease and the speed of encryption/decryption promote.This paper shows that Hi-times substitute makes permutation structure more complicity,so symmetrical permutation can be chosen as the diffusion module in block cipher algorithm design.