实现DES加密算法、实验目的

1、掌握DES加、解密算法的原理和过程；

2、能够编写程序实现DES加、解密，以及DES的应用。-DES encryption algorithm to achieve a lab report, the experiment was a master DES encryption, decryption algorithm principles and processes　2, able to write a program to achieve DES encryption and decryption, as well as the application of DES.