Caesar Cipher Tool

A simple web-based application that allows users to encrypt and decrypt text using the Caesar Cipher technique. This tool shifts each letter in the input text by a specified number of places in the alphabet.

Features

• Encrypt text using the Caesar Cipher method.
• Decrypt previously encrypted text.
• Adjustable shift value for flexibility.

Technologies Used

• HTML5
• CSS3
• JavaScript

Installation

1. Clone the repository:

   git clone https://github.com/Arpan-Saha-25/Web-Dev.git
   

2. Open the HTML file: Navigate to the cloned directory and open caesar_enc_dec.html in your web browser.

Usage

1. Enter the text you want to encrypt or decrypt in the text area.
2. Specify the shift value (default is 3).
3. Click the Encrypt button to encrypt the text or the Decrypt button to decrypt it.
4. The result will be displayed in the output text area.

Code Overview

JavaScript Functions

• encrypt(str, key):

  • Takes a string (str) and a numeric key (key).
  • Returns the encrypted string by shifting each letter by the key value.
  • Non-letter characters remain unchanged.

• decrypt(str, key):

  • Takes a string (str) and a numeric key (key).
  • Returns the decrypted string by shifting each letter back by the key value.
  • Non-letter characters remain unchanged.

Event Listeners

• The tool adds event listeners to the Encrypt and Decrypt buttons, triggering the respective functions and updating the output area with the results.

CSS Styles

The CSS file (caesar_enc_dec.css) provides a clean and modern look for the application. Key styles include:

• Background: A gradient from red to blue with fixed attachment.
• Container: A white, semi-transparent box with rounded corners and a shadow effect for focus.
• Buttons: Styled with a green background that darkens on hover, ensuring a responsive design.
• Text Areas: Full width for easy text input and output.

License

This project is open-source.

Contributing

Feel free to fork the repository and submit pull requests for any improvements or additional features.

Acknowledgments

• Inspired by classical encryption techniques.
• Done as a project for college assignment.