Cryptography Algorithms - Substitution, Polybius, and Caesar Shift Ciphers

Installation

1. Clone the repository to your local machine.

git clone https://github.com/your-username/your-project.git

2. Install the necessary dependencies.

npm install

3. Run the project.

npm start

Usage

Substitution Cipher

The substitution cipher replaces each letter in the message with a corresponding letter from a substitution alphabet. To use the substitution cipher, follow these steps:

const { substitution } = require('./substitution');
const message = "hello world";
const alphabet = "zyxwvutsrqponmlkjihgfedcba";
const encodedMessage = substitution(message, alphabet);
console.log(encodedMessage); // Output: svool dliow

Polybius Square Cipher

The Polybius square cipher encodes each letter in the message as a pair of numbers representing its row and column in a square grid. To use the Polybius square cipher, follow these steps:

const { polybius } = require('./polybius');
const message = "hello world";
const encodedMessage = polybius(message);
console.log(encodedMessage); // Output: 3251131343 25432451

Caesar Shift Cipher

The Caesar shift cipher shifts each letter in the message by a fixed number of positions in the alphabet. To use the Caesar shift cipher, follow these steps:

const { caesar } = require('./caesar');
const message = "hello world";
const shift = 3;
const encodedMessage = caesar(message, shift);
console.log(encodedMessage); // Output: khoor zruog

Contributing

Contributions are welcome! If you'd like to contribute to this project, please follow these steps:

1. Fork the repository.
2. Create a new branch.
3. Make your changes and commit them