Encryption and Decryption Application

This is a console-based application that allows users to encrypt and decrypt messages using a collection of classical cipher techniques.

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📜 Supported Ciphers

1. Affine Cipher
   A substitution cipher that uses mathematical functions for encryption. It applies the formula E(x) = (a * x + b) mod m, where a and b are keys, x is the letter index, and m is the alphabet size (usually 26).

2. Route Cipher
   A transposition cipher where the plaintext is written in a grid and then read off using a specific route pattern (e.g., spiral or zigzag), changing the order of characters.

3. Atbash Cipher
   A monoalphabetic substitution cipher where each letter is mapped to its reverse in the alphabet. For example, A becomes Z, B becomes Y, etc.

4. Vigenère Cipher
   A polyalphabetic substitution cipher that uses a keyword to shift letters of the plaintext. Each letter of the keyword determines the Caesar shift for each letter of the message.

5. Baconian Cipher
   A cipher that encodes each letter into a 5-letter string of A's and B's. It can be hidden in formatted text (like bold/italic) for steganographic purposes.

6. Simple Substitution Cipher
   Each letter in the plaintext is replaced by a unique corresponding letter from a scrambled alphabet. The same key is used for both encryption and decryption.

7. Polybius Square Cipher
   A cipher that uses a 5x5 grid to convert each letter into a pair of coordinates (row and column). Commonly used with digits (e.g., A = 11, B = 12, ..., Z = 55).

8. Morse Cipher
   Converts text into sequences of dots (.) and dashes (-) representing letters and digits. It’s useful for telecommunication and has pauses between letters and words.

9. XOR Cipher
   A cipher that uses the XOR bitwise operation between the plaintext and a repeating key to encrypt and decrypt messages. It’s simple but effective when used with a truly random key.

10. Rail Fence Cipher
    A transposition cipher that writes the message in a zigzag pattern (like rails of a fence) across multiple rows, then reads row by row to get the ciphertext.

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💡 Features

• Provides both encryption and decryption for each method.
• Great for learning, testing, or demonstrating classical cryptographic techniques.

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🤝 Contributing

Contributions are welcome! Feel free to fork the repo, create a new branch, and submit a pull request.

📬 Contact

• Mohammed Atef Abd El-Kader: GitHub - LinkedIn
• Esraa Emary Abd El-Salam: GitHub - LinkedIn
• Aly El-Deen Yasser Aly: GitHub - LinkedIn

📜 License

This project is licensed under the MIT License.