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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.

📜 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.

💡 Features

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

🤝 Contributing

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

📬 Contact

📜 License

This project is licensed under the MIT License.