经典密码算法。四个打包。包括移位密码，弗吉尼亚密码，周期密码，列置换密码。使用C语言实现，控制台程序。可用于密码学实验。-Classical cryptographic algorithms. Four packaging. Including the shift cipher, Virginia passwords, periodic password column permutation password. Using the C language, the console program. Cryptography can be used for experiments.