🔐 Secure Tic-Tac-Toe Over SSL 🎮

A secure two-player Tic-Tac-Toe game using Python socket programming, SSL encryption, and Tkinter GUI. This project was developed as a group mini-project as part of the Computer Networks course, demonstrating real-time multiplayer communication over a secure TLS-encrypted client-server architecture.

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🎯 Objective

To build a client-server Tic-Tac-Toe game that:

• Supports two-player encrypted communication using SSL
• Offers a GUI interface for players using Tkinter
• Uses socket, threading, and secure communication principles

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🛠️ Technologies Used

• Python 3
• Sockets & Threading
• SSL/TLS (with ssl module)
• Tkinter (GUI)
• X.509 certificate (.crt and .key)

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🧩 How It Works

🖥️ Server (server.py)

• Accepts two clients over TLS
• Assigns player marks: 'X' and 'O'
• Handles game logic, player turns, and broadcasts updates
• Detects win/draw and notifies both clients

👨‍💻 Client (client.py)

• Connects to the server securely via SSL
• GUI-based 3x3 grid using Tkinter
• Sends player moves, receives updates
• Displays results via pop-up dialogs

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🔐 Security

• TLS/SSL-based communication (using ssl.SSLContext)
• Encrypted data between client and server
• Certificate and private key files are used for authentication

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▶️ How to Run

1. 🧾 Generate SSL Certificate (Optional, if you don’t have one):

openssl req -new -x509 -days 365 -nodes -out server.crt -keyout server.key

You can also use the provided server.crt and server.key.

2. 🚀 Run Server (on terminal 1):

python server.py

3. 🧑‍🤝‍🧑 Run Clients (on terminal 2 and 3, or different machines):

python client.py

Ensure that the IP in client.py and server.py match your local/host machine IP (e.g., 192.168.x.x).

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📷 Sample Screenshot

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