Substitution Cipher in C#

This C# project implements a simple Substitution Cipher, a type of encryption where each letter in the plaintext is replaced with a letter from a shuffled alphabet. This program provides functionalities for both encryption and decryption.

Features

• Encrypt and Decrypt: Encrypt or decrypt messages using a user-defined or randomly generated shuffled alphabet.
• Shuffled Alphabet Generation: Automatically generate a shuffled alphabet if the user does not provide one.
• Validation: Ensures that the shuffled alphabet provided by the user is valid and contains all letters from A-Z exactly once.

Getting Started

To run this project, you need to have the .NET runtime installed on your machine. This project was developed using C# and .NET.

Prerequisites

• .NET SDK (Version 6.0 or later)

Running the Project

1. Clone the Repository:

   git clone https://github.com/yourusername/SubstitutionCipher.git