Des算法是一种标准的对称加密算法，其精华就是明文经过一系列的复杂变化后，一般在不知密码的情况下要把它的恢复很难。



算法可以由四个部分描述：



1.获取16个子密钥

2.初始置换置换函数ip

3.加密函数f

4.末置换函数

-Des Algorithm is a standard symmetric encryption algorithm, and its essence is clear after a series of complex changes in law, the general in the circumstances I do not know the password should be difficult to restore it. Algorithm can be described in four parts: 1. To obtain 16 sub-keys 2. The initial replacement replacement function ip 3. Cryptographic function f 4. At the end of displacement function