Kotlin Vigenère Cipher 🔐

This command-line tool securely encrypts and decrypts messages using the classic Vigenère cipher, a historically significant polyalphabetic substitution cipher known for its strength in the pre-computer era.

Key Features

• Command-Line Interface: Easily encrypt and decrypt messages directly from your terminal.
• Kotlin Implementation: Modern and expressive programming language for a clean codebase.
• User-Friendly Menu: Intuitive menu guides you through the encryption/decryption process.

Getting Started

Prerequisites

Ensure you have Kotlin installed on your system. Kotlin Installation Guide

Compilation

• Open the project in your favorite IDE (IntelliJ IDEA, etc.) or use the Kotlin compiler directly.
• Build the project to generate the executable file.

Running the Application

• Open your terminal or command prompt.
• Navigate to the directory where the compiled executable is located.
• Run the executable (e.g., ./kotlin-vigenere-cipher or kotlin-vigenere-cipher.exe).

Using the Menu

• Encrypt: Enter 1 and follow the prompts to provide your message and secret key.
• Decrypt: Enter 2 and follow the prompts to provide your ciphertext and secret key.
• Exit: Enter 0 to quit the application.

Example Usage

# Encryption
Choose an option:
1 - Encode message
2 - Decode message
0 - Exit
1
Enter the message: attackatdawn
Enter the key: LEMON
The encrypted text is: lxfopvefrnhr

# Decryption
Choose an option:
1 - Encode message
2 - Decode message
0 - Exit
2
Enter the message: lxfopvefrnhr
Enter the key: LEMON
The decoded message is: attackatdawn

Contributions

😄 Contributions are always welcome! Feel free to open issues or submit pull requests to contribute to this project.

Let me know if you need further modifications!