all substitution cipher in 1 program menu driven

代换密码是密码学中的一种古典密码，这个代码就是用来实现该密码的-Substitution cipher is a classical cryptography password, this code is used to implement the password

The Vigenère cipher is a method of encrypting alphabetic text by using a series of different Caesar ciphers based on the letters of a keyword. It is a simple form of polyalphabetic substitution.