Vigenère and Vernam Cipher Encryption/Decryption Tool

This project is a Python implementation of two classical cryptography techniques: the Vigenère Cipher and the Vernam Cipher. It allows users to encrypt and decrypt messages using either cipher method through a simple command-line interface.

Features

• Vigenère Cipher:

  • Encrypt plaintext using a keyword.
  • Decrypt ciphertext using the same keyword.

• Vernam Cipher:

  • Encrypt plaintext using a keyword of the same length.
  • Decrypt ciphertext using the same keyword.

Prerequisites

• Python 3.x

How to Use

1. Clone the Repository:

   git clone https://github.com/thesaajii/Cryptography.git
   cd cipher-tool

2. Run the Script:

   python3 cipher.py

3. Choose the Cipher Method:

   • Select 1 for Vigenère Cipher.
   • Select 2 for Vernam Cipher.

4. Choose the Operation:

   • Select 1 for Encryption.
   • Select 2 for Decryption.

5. Input the Required Data:

   • For Vigenère Cipher: Input the plaintext/ciphertext and keyword.
   • For Vernam Cipher: Input the plaintext/ciphertext and a keyword of the same length.

6. View the Result:

   • The program will output the encrypted or decrypted text.

Example

Vigenère Cipher

• Encrypting:

  • Plaintext: HELLO
  • Keyword: KEY
  • Ciphertext: RIJVS

• Decrypting:

  • Ciphertext: RIJVS
  • Keyword: KEY
  • Plaintext: HELLO

Vernam Cipher

• Encrypting:

  • Plaintext: HELLO
  • Keyword: XMCKL
  • Ciphertext: EQNVZ

• Decrypting:

  • Ciphertext: EQNVZ
  • Keyword: XMCKL
  • Plaintext: HELLO

Notes

• The Vernam Cipher requires the keyword to be of the same length as the plaintext or ciphertext.
• The script only handles uppercase English letters (A-Z). Ensure your inputs are in uppercase.

Contributing

Feel free to fork this repository, submit issues, and make pull requests. Contributions are always welcome!