计算机网络安全技术实验，密码算法的实现，实现密码算法（Playfair密码算法，DES算法， RSA算法）-Computer network security technology experiment, the realization of cryptographic algorithms to achieve encryption algorithm (Playfair cipher, DES algorithm, RSA algorithm)

这是哈工大计算机专业密码学课程的实验四的源代码，主要实现的功能是制作一个密码系统实现加密解密，认证等功能，除此以外还设置成为p2p模式的网络文件共享系统！-This is the Harbin Institute of Technology computer science courses Experiment 4 cryptography source code, the main function is to create a password system to achieve encry