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。实际运用中，密钥只用到了64位中的56位，这样才具有高的安全性。

-The basic principle of DES is that its entrance there are three parameters: key, data, mode. key used for encryption and decryption keys, data encryption and decryption for the data, mode of its work. When the model for the encryption mode, expressly in accordance with the grouping 64 to form a specific group, key for data encryption, when the model mode for decryption, key for decryption of data. Practical application, the key has been used only 64 of 56, so that with high security.