USE C++: Encryption and Decryption are two cryptographic
techniques. Encryption is used to transform text to meaningless
characters, and decryption is used to transform meaningless
characters into meaningful text. The algorithm that does the
encryption is called a cipher. A simple encryption algorithm is
Caesar cipher, which works as follows: replace each clear text
letter with a letter chosen to be n places later in the alphabet.
The number of places, n, is called the cipher key. For example, if...