📞 Encrypted Chat & VoIP with PNG Database

This project is a peer-to-peer chat and VoIP system built with Python.
It includes:

• Encrypted JSON-over-PNG Database (pngdb.py) – stores data securely in image files.
• Async WebSocket Server (server.py) – handles chat, file transfer, and VoIP signaling.
• Terminal Client (TUI) (client.py) – provides chat UI, file sharing, and VoIP with noise reduction.

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✨ Features

• 🔐 End-to-End Encryption with Fernet (AES-256 under the hood).
• 🖼️ PNG Database: JSON-based data stored encrypted in PNG images.
• 💬 Real-time Messaging: Chat with contacts using Socket.IO over WebSockets.
• 📂 File Sharing: Send/receive encrypted files.
• 📞 VoIP Calls: Real-time audio calls with noise reduction and jitter buffering.
• 🖥️ TUI Interface: Chat, status, and call control in the terminal with curses.

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🚀 Quick Start

1. Clone the repo

git clone https://github.com/EndermanPC/Chat-VoIP.git
cd Chat-VoIP

2. Install dependencies

pip install -r requirements.txt

3. Run the server

python server.py

Server defaults:

• WebSocket API: http://localhost:5000
• Database: chat_db.png (AES-encrypted)

4. Run the client

python client.py

You’ll be prompted for:

• Phone (+84…)
• Password

5. Use the TUI

• Ctrl+N → start new chat
• Ctrl+F → send file
• Ctrl+O → start/end call
• Ctrl+K / Ctrl+L → switch chats
• Ctrl+C / Ctrl+D → exit

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🔧 Configuration

Set via environment variables:

Variable	Default	Description
CHAT_SERVER_URL	http://localhost:5000	Server address
CHAT_CLIENT_PHONE	prompted	Your phone number
CHAT_CLIENT_PASS	prompted	Your password
CHAT_DOWNLOAD_DIR	.	Directory to save files
CHAT_DB_FILE	chat_db.png	PNG database file
CHAT_DB_PASSWORD	change_me	Database password
VOIP_UDP_HOST	127.0.0.1	Server IP for VoIP relay
VOIP_UDP_PORT	10000	UDP port for VoIP relay

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📸 Screenshots

Here’s how the TUI looks:

Phone (Termux)	Desktop (Linux)

(Place your screenshots in docs/screenshots/ folder, filenames can be changed as needed.)

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📦 Requirements

See requirements.txt. Major libraries:

• python-socketio[aiohttp] – WebSocket server & client
• cryptography – Fernet encryption
• pycryptodome – AES encryption for PNG DB
• Pillow – PNG image handling
• sounddevice, numpy, noisereduce – VoIP audio processing
• bcrypt – password hashing

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🛠️ Project Structure

├── client.py   # Terminal chat & VoIP client
├── server.py   # Async chat/VoIP server
├── pngdb.py    # PNG-based encrypted DB
├── requirements.txt
├── README.md
└── screenshots

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📌 Roadmap

• Group chats
• End-to-end encrypted calls
• Desktop client (GUI)

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📝 License

Apache License 2.0 © 2025 Bùi Nguyễn Tấn Sang