RSA Chat System (Educational Project)

A simple educational project built with PHP that demonstrates the basic concepts of RSA Cryptography, including key generation, message encryption, and message decryption.

⚠️ This project is developed for learning and academic purposes only. It is not intended for production-level security.

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Features

• User Registration
• RSA Key Generation
• Public Key & Private Key Demonstration
• Message Encryption
• Message Decryption
• SQLite Database Support
• Simple and Beginner-Friendly Interface
• Pure PHP Implementation

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Technologies Used

• PHP
• SQLite
• HTML
• CSS
• JavaScript

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Project Objective

The main goal of this project is to help students understand the basic concepts of Public Key Cryptography using the RSA algorithm.

This project demonstrates:

• How RSA keys are generated
• How encryption works
• How decryption works
• The relationship between Public Key and Private Key

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Project Structure

project/
│
├── database/
├── assets/
├── includes/
├── views/
├── index.php
└── README.md

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Requirements

Before running the project, make sure you have:

• PHP 8.0 or higher
• Modern Web Browser
  • Chrome
  • Firefox
  • Edge

No external database server is required because SQLite is used.

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Installation

Step 1: Download the Project

Clone the repository:

https://github.com/dev-talha/ras-algorithm.git

Or download the ZIP file and extract it.

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Step 2: Open Terminal

Navigate to the project directory:

cd rsa-chat-system

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Step 3: Start PHP Development Server

Run:

php -S localhost:8000

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Step 4: Open in Browser

Visit:

http://localhost:8000

The application should now be running.

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How It Works

1. User Registration

A user creates an account through the registration form.

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2. RSA Key Generation

The system generates RSA values such as:

p
q
n
d

Where:

• p and q are prime numbers
• n = p × q
• d is the private exponent

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3. Public Key

The Public Key is used to encrypt messages.

It can be shared publicly.

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4. Private Key

The Private Key is used to decrypt messages.

It should remain secret.

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5. Encryption

The user enters a message.

The system converts the original message into encrypted data.

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6. Decryption

The encrypted message is processed using the Private Key.

The original message is recovered successfully.

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Educational Notes

This project is intentionally simplified so students can understand RSA more easily.

Real-world RSA systems use:

• Very large prime numbers
• Strong cryptographic libraries
• Advanced security mechanisms

This project focuses on learning the RSA workflow rather than providing production-level security.

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Example RSA Concepts

p = Prime Number
q = Prime Number

n = p × q

Public Key = (e, n)

Private Key = (d, n)

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Learning Outcomes

After studying this project, students should understand:

• Basic cryptography concepts
• Public Key Cryptography
• RSA key generation
• Encryption process
• Decryption process
• Secure communication principles

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Disclaimer

This project is created solely for educational and academic purposes.

Do not use this implementation to protect sensitive information in real-world applications.

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Author

Developed as an Educational RSA Cryptography Project for learning and academic demonstration.

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License

This project is free to use for educational purposes.