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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Block cipher used in this system of thought, of the 128-bit encryption and decryption expressly groups.

一个自己设计的加密体制。本体制采用分组密码思想，对128位的明文分组进行加解密。

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Block cipher used in this system of thought, of the 128-bit encryption and decryption expressly groups.

一个自己设计的加密体制。本体制采用分组密码思想，对128位的明文分组进行加解密。

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