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.
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。
The general design rules of block cipher is discussed by analyzing the encryption process, key generating, encryption function and decryption process of des algorithm.
文中以DES加密算法为例，在分析DES加密过程、密钥计算、加密函数和解密过程的基础上，探讨分组密码的设计原则。
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