vigenere-simple-transpose-cipher

Vigenère Cipher and Simple Transposition App

About

This Node.js application encrypts and decrypts messages using a combination of the Vigenère cipher and a simple transposition method based on the "SEND TO" concept. The application allows users to input a plaintext or ciphertext and then perform encryption or decryption operations using a hardcoded key.

Installation

To use this application, you need to have Node.js installed on your system. Follow these steps to get started:

1. Clone the repository.
2. Navigate to the cloned directory.
3. Install dependencies.

Usage

To run the application, use the following command: node app.js

After starting the app, follow these steps:

1. Enter 1 for encryption or 2 for decryption.
2. Input the plaintext (for encryption) or ciphertext (for decryption) as prompted.

Encryption

• The plaintext will be encrypted using the Vigenère cipher and then transposed using the "SEND TO" transposition method.

Decryption

• The ciphertext will first be decrypted using the simple transposition method and then using the Vigenère cipher.

Contributing

Contributions to this project are welcome. Please ensure to update tests as appropriate.

License

MIT