自己编写的加解密程序、包括凯撒、Vigenere、Permutation、DES、RC4、Playfair、RSA、DF密钥交换等密码的实现与演示。值得学习密码和做该方面实践的同学一看。-Prepared their own encryption and decryption procedures, including Caesar, Vigenere, Permutation, DES, RC4, Playfair, RSA, DF, such as password key exchange