DES 工作的基本原理是，其入口参数有三个:key、data、mode。 key为加密解密使用的密钥，data为加密解密的数据，mode为其工作模式.当模式为加密模式时，明文按照64位进行分组，形成明文组，key用于对数据加密，当模式为解密模式时，key用于对数据解密.DES的过程是：加密前，先将明文分成64位的分组，然后将64位二进制码输入到密码器中.密码器对输入的64位码首先进行初始置换，然后在64位主密钥产生的16个子密钥控制下进行16轮乘积变换，接着再进行末置换，即可得到64位已加密的密文.-The basic principles of the DES work, the entrance to the three parameters: key, data, mode. key for encryption decryption key data encryption and decryption of data, the mode of its working mode. mode encryption mode expressly grouped in accordance with 64 formed expressly Group, the key used for data encryption, when the mode is decryption mode, the key used to decrypt the data. DES process is: prior to encryption, the first plaintext is divided into 64 grouping, and then the 64-bit binary code input to the password in the first 64 yards of the password input initial replacement, and 64 of the master key 16 subkeys under the control of the 16 product transformation, followed by the end of replacement, you can get 64 encrypted ciphertext.