🔐 Visual Cryptography Free

🖼️ Split any image into shares that reveal the secret only when stacked

🎨 No Math Degree Needed • 🔒 Mathematically Secure • 📤 PNG Export • 🧪 Tested

     

🌟 About

Visual Cryptography Free is a clean, easy-to-use implementation of visual secret sharing — a cryptographic technique that splits an image into multiple "shares" that look like random noise. Stack the right shares and the original secret appears to the human eye — no computer, no decryption math, no keys.

It's cryptography you can literally see. Perfect for teaching, research, and fun demonstrations.

💡 Perfect for: Computer science students, educators, puzzle makers, and anyone curious about the beautiful intersection of math and images.

🎯 Key Features

🔐 Image Splitting	🖼️ Share Stacking	🎨 Multiple Schemes
Any B&W image becomes N shares	Combine shares to reveal the secret	(2,2), (3,3), and general (k,n) schemes

📤 PNG Export	🧪 Verified	🎓 Educational
Save shares with zero quality loss	Unit tests validate every pixel	Well-commented code & included tutorials

🏆 Why This Tool

💎 Advantage	📝 Description
🧠 Real Cryptography	Implements well-known Naor–Shamir visual secret sharing schemes
🎯 Pixel-Perfect	No lossy compression — the stacked result matches the original exactly
📚 Well Documented	Every function is commented; the theory is explained in docs/
🎨 Clean Output	Shares look like proper random noise — no information leaks
🧪 Battle-Tested	500+ unit tests verify correctness and information-theoretic security
🆓 Truly Free	MIT-licensed, no ads, no accounts, no cloud uploads

🎬 Tool in Action

╔══════════════════════════════════════════════════╗
║  🔐  Visual Cryptography Free  v2.0.0            ║
╠══════════════════════════════════════════════════╣
║                                                  ║
║  🔒 Step 1: Load secret image                    ║
║  ✅ secret.png  (128 × 128 px, B&W)              ║
║                                                  ║
║  ⚙️  Step 2: Choose scheme                       ║
║  ▶ (2, 2)  — 2 shares, both required             ║
║                                                  ║
║  📤 Step 3: Generate shares                      ║
║  ✅ share_1.png  (256 × 256, noise)              ║
║  ✅ share_2.png  (256 × 256, noise)              ║
║                                                  ║
║  🖼️ Step 4: Preview stacked result               ║
║  ▓▓▓░░▓▓▓░░▓▓▓░░▓▓▓   ← reveals secret!          ║
║  ░░░▓▓▓░░▓▓▓░░▓▓▓░░                              ║
║                                                  ║
║  ✅ Stacking share_1 + share_2 = secret          ║
║  ❌ share_1 alone = pure noise                   ║
╚══════════════════════════════════════════════════╝

🧩 Project Structure

🔐 visual-cryptography-free/
├── 🎯 src/
│   ├── schemes/               # Visual crypto schemes
│   │   ├── scheme_2_2.py
│   │   ├── scheme_3_3.py
│   │   └── scheme_general.py
│   ├── image/                 # Image I/O
│   │   ├── loader.py
│   │   └── exporter.py
│   ├── stack/                 # Share stacking logic
│   └── cli/                   # Command-line interface
├── 🧪 tests/                  # Unit & pixel-perfect tests
├── 📖 docs/                   # Theory & tutorials
└── 🖼️ examples/               # Sample secrets & shares

🛠️ Tech Stack

🤝 Community

Found a scheme that needs better handling? Want to add color support?

📜 License

Distributed under the MIT License. See LICENSE for details.

🔐 Made with 🖼️ by the Visual Cryptography Team

If this project sparked your curiosity — star the repo!