This is a textbook exercise BOOK NAME: Fundamentals of Computer Programming with Programming Basics with C# $($English$)$ C#: Crypto Interface Project

Encryption can be described as the process of writing data in a secret code. Decryption is the process of restoring encrypted data to its original state. If you want to send a secret message to someone, you use an encryption algorithm to encrypt the message before you send it$.$ The person receiving the encrypted message must use a decryption algorithm to convert the message to its original contents. Although not very secure$,$ one of the simplest types of encryption algorithms is the substitution algorithm. A substitution algorithm takes a string and substitutes each character with some other predefined character. For example, each occurrence of the letter $\text{'}$A$\text{'}$ might be substituted with the letter $\text{'}$M$\text{'},$ and each occurrence of the letter $\text{'}$B$\text{'}$ might be substituted with the letter $\text{'}$W$\text{'}.$ To decrypt the message, the substitutions must happen in reverse.

In this programming problem, you will create a project and add the following interface:

interface Crypto

$\{$

string Encrypt$($string str$)$;

string Decrypt$($string str$)$;

$\}$

The Crypto interface specifies two methods: encrypt and decrypt. The intention of the encrypt method is to accept a string argument and return an encrypted version of that string. The intention of the decrypt method is to accept the encrypted string and return a decrypted version of that string.

Next, you will write two classes named Cipher$1$ and Cipher$2.$ Each of these classes must implement the Crypto interface. The Cipher$1$ class will use a substitution algorithm to encrypt and decrypt strings, and the Cipher$2$ class will use a different substitution algorithm to encrypt and decrypt strings. $($You must design the algorithm for each class.$)$

Once you have written the interface and the classes, create a user interface that allows the user to enter a message. The application should then perform the following:

$$ Encrypt the message using the Cipher$1$ object and display the encrypted message that is returned from the Cipher$1$ object's Encrypt method.

$$ Decrypt the message using the Cipher$1$ object and display the decrypted message that is returned from the Cipher$1$ object's Decrypt method. This should be the same as the original message.

$$ Encrypt the message using the Cipher$2$ object and display the encrypted message that is returned from the Cipher$2$ object's Encrypt method.

$$ Decrypt the message using the Cipher$2$ object and display the decrypted message that is returned from the Cipher$2$ object's Decrypt method. This should be the same as the original message.