DES的每个分组是64位，既明文和密钥都是64位（密钥实际用56位，每字节第8位为校验）。这个算法的核心是Feistel密码，由于其设计的巧妙，加密解密都用一个函数，具体原理请查阅其他资料。DES的流程基本是执行16轮下面的运算：-DES each packet is 64, both explicit and are 64-bit key (actual key 56, the first 8 bytes each for validation). The core of this algorithm are Feistel password, because of its ingenious design, encryption and decryption using a function, specifically the principle of access to other information requested. DES is the implementation of the basic flow of 16 the following operations: