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🎨 No Math Degree Needed • 🔒 Mathematically Secure • 📤 PNG Export • 🧪 Tested
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.
| 🔐 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 |
| 💎 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 |
╔══════════════════════════════════════════════════╗
║ 🔐 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 ║
╚══════════════════════════════════════════════════╝
🔐 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
Found a scheme that needs better handling? Want to add color support?
Distributed under the MIT License. See LICENSE for details.