Dracon-24/Medi-Chain

A lightweight, offline cryptographic integrity system for medical records using ECC signatures, SHA-256 hashing, version chaining, and tamper-evident audit logs — designed for low-resource hospitals. # Lightweight Cryptographic Integrity System for Medical Records ## Quick Start (3 commands) ```bash # 1. Install the only dependency pip install cryptography # 2. Run ALL tests at once python run_all_tests.py # 3. Or run the full hospital simulation only python simulation.py ``` That's it. No database, no server, no config files needed. --- ## What You Can Run ### Option 1: Run Everything (Recommended) ```bash python run_all_tests.py ``` Runs all 11 modules in sequence, shows PASS/FAIL for each, and prints a summary report. This is the single command that verifies the entire system. ### Option 2: Run the Full Simulation ```bash python simulation.py ``` Simulates a complete hospital workflow: - Admin registers a doctor and nurse - Doctor logs in via nonce challenge - Doctor creates a patient record (chest pain → MI) - Nurse adds vitals (version 2) - Doctor adds ECG results (version 3) - System verifies record integrity + full version chain - System reviews the 10-entry audit log - Attacker tampers with record → DETECTED - Attacker forges hash too → STILL DETECTED (signature catches it) - Attacker edits audit log → DETECTED ### Option 3: Run Individual Modules Each module has a built-in self-test. Run any one directly: ```bash # Crypto primitives python hash_engine.py # SHA-256 hashing python key_manager.py # Ed25519 key generation python signer.py # Digital signing python verifier.py # Signature verification # System layers python auth.py # Nonce challenge-response login python record_manager.py # Record creation python record_verifier.py # Record integrity checks python version_manager.py # Hash-chained versioning python audit_logger.py # Hash-chained audit logs # Security testing python tamper_detector.py # 5 different attack simulations ``` --- ## Project Structure ``` crypto_integrity_system/ ├── hash_engine.py # SHA-256 hashing ├── key_manager.py …