Project Overview
A multiplayer implementation of the classic Rock-Paper-Scissors game built with Python's socket programming. The project features secure user authentication, real-time network communication, and robust client-server architecture designed to handle multiple concurrent players.
This project demonstrates advanced networking concepts, security best practices with password hashing, and the implementation of a game protocol that maintains synchronization between multiple clients through a central server.
Key Features
Secure Authentication
User registration and login system with bcrypt password hashing for enhanced security.
Client-Server Architecture
Robust TCP socket communication handling multiple concurrent connections with threading.
Real-Time Gameplay
Synchronized game state between players with instant move validation and result processing.
Session Management
Persistent user sessions with reconnection capabilities and game state preservation.
Matchmaking System
Automatic player pairing and lobby management for seamless multiplayer experience.
Error Handling
Comprehensive error handling for network issues, disconnections, and invalid game states.
Technical Implementation
The project utilizes Python's built-in socket library for network communication, with additional security provided by the bcrypt library for password hashing and user authentication.
Core Technologies:
- Python Sockets - TCP/IP network communication
- Threading - Concurrent client handling on the server
- bcrypt - Secure password hashing and verification
- JSON Protocol - Structured message formatting between client and server
- SQLite - Local user database for authentication
# Server-side client handler with secure authentication
import socket
import threading
import bcrypt
import json
class GameServer:
def __init__(self, host='localhost', port=12345):
self.host = host
self.port = port
self.clients = {}
self.games = {}
def handle_client(self, client_socket, address):
try:
while True:
message = client_socket.recv(1024).decode('utf-8')
if message:
data = json.loads(message)
self.process_message(client_socket, data)
else:
break
except Exception as e:
print(f"Error handling client {address}: {e}")
finally:
self.disconnect_client(client_socket)
def authenticate_user(self, username, password):
# Hash password and verify against database
stored_hash = self.get_user_hash(username)
return bcrypt.checkpw(password.encode('utf-8'), stored_hash)Network Architecture
The game follows a client-server model with the following communication flow:
Server Responsibilities:
- Connection Management - Accept and manage multiple client connections
- Authentication - Verify user credentials and maintain sessions
- Game Logic - Process moves, determine winners, and maintain game state
- Matchmaking - Pair players and create game instances
- Broadcasting - Send game updates to all relevant clients
Client Responsibilities:
- User Interface - Handle player input and display game state
- Network Communication - Send moves and receive updates from server
- Session Management - Maintain connection and handle reconnection
- Input Validation - Ensure valid moves before sending to server
Security Implementation
Security was a key consideration in the project design, implementing several measures to protect user data and game integrity:
Password Security:
- bcrypt Hashing - Industry-standard password hashing with salt
- No Plain Text Storage - Passwords never stored in readable format
- Secure Transmission - Hashed passwords sent over network
Network Security:
- Input Validation - All incoming data validated before processing
- Session Tokens - Unique identifiers for authenticated sessions
- Connection Limits - Prevent spam connections and DOS attacks
- Graceful Disconnection - Proper cleanup when clients disconnect
Future Enhancements
Several improvements could be made to expand the project's functionality:
- GUI Interface - Replace console interface with a graphical user interface using tkinter or pygame
- Tournament Mode - Support for multi-round tournaments with bracket systems
- Spectator Mode - Allow users to watch ongoing games without participating
- Statistics Tracking - Win/loss records, player rankings, and historical data
- Chat System - In-game messaging between players
- SSL/TLS Encryption - Encrypted communication for enhanced security