Visual one-time pad
- Using your mouse, finger, or the arrow keys ↑ ↓ ← →, slide the black encryption key around to decrypt each of the two ciphertexts.
- When you've got it right, the secret message will suddenly become visible.
- You can also slide the ciphertexts around to see why it's called the "one-time pad" and how things go wrong when you encrypt two messages with the same key.
- Learn more about one-time pads and visual cryptography on Wikipedia.