Vigenère Cipher Encoder/Decoder

A Python implementation of the Vigenère Cipher, a classic encryption method using a keyword to encode and decode messages. Unlike the Caesar Cipher, this method uses a series of interwoven Caesar ciphers based on the letters of a keyword, adding security against frequency analysis.

Features

• Encryption: Encode plaintext using a specified keyword.
• Decryption: Decode encrypted text using the original keyword.
• Flexible Keyword: Supports customizable keywords of any length.
• Character Filtering: Ignores spaces and special characters if desired; alphabetic-only and case-insensitive.
• Simple Interface: Provides a command-line interface (CLI), with optional expansion for a web-based frontend.

How It Works

The Vigenère Cipher shifts each character in the plaintext according to the corresponding character in a repeating keyword. This polyalphabetic approach strengthens the cipher against frequency-based attacks.

Example

• Plaintext: "HELLO WORLD"
• Keyword: "KEY"
• Encrypted Text: "RIJVS UYVJN"

Technologies Used

• Python/JavaScript: Core logic for encryption and decryption

Getting Started

Clone the repository and install any required dependencies.

Clone the repository:

git clone https://github.com/Jurioton/Vigen-re-cipher.git
cd vigenere-cipher
#for encrption
python encrytion.py
#for decryption
python decryption.py

Future Improvements

-User Interface: Potential to expand into a web-based interface for ease of use