Home▸Cryptography▸Blind Signatures: Getting Something Signed Without Letting the Signer See It

✍️ Blind Signatures: Getting Something Signed Without Letting the Signer See It

Explore how RSA blind signatures let an authority cryptographically sign a message without ever seeing its contents, enabling anonymous digital cash and unlinkable e-voting.

Cryptography3DModerate60 FPS

The simulator walks through the full RSA blind signature protocol step by step, showing the message, the random blinding factor, the blinded value sent to the signer, and the unblinded result.

🔬 What It Demonstrates

The simulator walks through the full RSA blind signature protocol step by step, showing the message, the random blinding factor, the blinded value sent to the signer, and the unblinded result.

🎮 How to Use

Enter or randomize a message and a blinding factor, watch the blinding and signing operations compute live, then unblind the result and verify the final signature against the signer's public key.

💡 Did You Know?

Did you know that Chaum's original blind signature scheme for digital cash predates Bitcoin by nearly three decades, and that some modern anonymous credential systems still rely on the same core RSA blinding trick?

⚙ Under the hood

Explore how RSA blind signatures let an authority cryptographically sign a message without ever seeing its contents, enabling anonymous digital cash and unlinkable e-voting.

cryptographyblind-signaturesrsaprivacydigital-cashanonymitye-votingdavid-chaum

3D · Three.js / WebGL renderer · 60 FPS target · runs fully client-side, no install