CyberLink - Secure Communication Platform

<p align="center"> <img src="Cyberlink-logo.svg" width="720"> </p> CyberLink is a secure communication platform that allows users to exchange messages and files with end-to-end encryption. The application consists of a Flask-based server and a Python client that work together to provide secure communications.

Features

• User registration and login with encrypted credentials
• End-to-end encrypted messaging
• Secure file transfer capabilities
• Network tracing tools
• Unique "Cyber Code" identifiers for each user

Setup Instructions

Prerequisites

• Python 3.8 or higher
• Required Python packages (install using pip install -r requirements.txt)

Installation

1. Clone or download the repository
2. Install the required dependencies:

   pip install -r requirements.txt
   

Running the Server

1. Start the Flask server:

   python server.py
   

   The server will run on 0.0.0.0:5000 by default (accessible on all network interfaces).

   

Running the Client

1. Make sure the server is running
2. Start the client application:

   python client.py
   

   

Usage

Registration

1. Select Option 1 from the main menu
2. Enter a username and password
3. Your unique Cyber Code will be generated - save this for future logins

Login

1. Select Option 2 from the main menu
2. Enter your username and password
3. Upon successful login, you'll see your Cyber Code

Sending Messages

1. After login, select Option 1
2. Enter the recipient's Cyber Code
3. Type your message

Receiving Messages

1. After login, select Option 2
2. The client will continuously check for new messages
3. Press Ctrl+C to stop receiving messages

File Transfer

1. Select Option 3 to send a file
2. Enter the recipient's Cyber Code
3. Provide the full path to the file you want to send

Downloading Files

1. Select Option 4 to list available files
2. Select Option 5 to download a file
3. Enter the file ID from the list
4. Specify a download directory (or press Enter for current directory)

Network Tracing

1. Select Option 6 to perform network tracing
2. Enter a target hostname or IP address
3. View DNS information and trace results
4. Results are saved to a text file for future reference

Security Features

• RSA encryption for user authentication
• Fernet symmetric encryption for message content
• Secure file transfer with validation
• Unique Cyber Codes for user identification

Limitations and Warnings

• Debug mode is enabled on the server (not recommended for production)
• The application uses a local SQLite database
• File type restrictions are enforced for security

LICENSE

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This project is licensed under the GNU General Public License v3.0 - see the LICENSE file for details.