在分组密码的设计中，提高分组密码的抗差分攻击性能是一个重要的课题。
An important problem in the design of the block cipher is to improve the performance of the resisting differential cryptanalysis.
AC分组密码的设计结合了宽轨迹策略和比特块技术，以确保算法对差分密码分析和线性密码分析的安全性。
The cipher design combines the wide trail strategy and bit-slice technology that ensure the resistance AC against differential and linear cryptanalysis.
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。
The general design rules of block cipher is discussed by analyzing the encryption process, key generating, encryption function and decryption process of des algorithm.
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