Fast DES kit - Phil Karn, KA9Q September 2, 1994 This archive includes optimized DES code in portable C, Borland inline assembler for the 386, and GNU 'as' format assembler for the 386. Contents: readme - this file readme.des - details on

随即生成0-256之间数字并进行s-p置换 用C语言编程实现。-Randomly generated number between 0-256 and for sp replacement with C language programming.

SPN加密 此代码实现S-P密码的 解密，在这个实验中用到了S盒和P盒 -SPN SP encrypt this code to decrypt the password, in this experiment used the S and P boxes boxes