In cryptography, a Caesar cipher, also known as Caesar's cipher, the shift cipher, Caesar's code or Caesar shift, is one of the simplest and most widely known encryption techniques. It is a type of substitution cipher in which each letter in the plaintext is replaced by a letter some fixed number of positions down the alphabet. Given an arbitrary cipher text file, you need to write a C++ program to find the value of the shift, and decrypt the cipher text to plaintext. You must NOT hard code the plain text or the cipher text in your program. Your program should try various shift values, and compare with these common English words:.