Quantum Algorithms Database
Quantum Digital Signatures
A quantum protocol allowing a sender to digitally 'sign' a message such that recipients can verify its authenticity, with security guaranteed by quantum mechanics rather than computational assumptions.
Year
2001 (Gottesman & Chuang)
Inventor(s)
Gottesman & Chuang
Speedup Type
No Speedup Claimed
Difficulty
★★★★☆
The Problem
Proving that a message genuinely came from a specific sender and hasn't been tampered with, without relying on classical cryptographic assumptions that quantum computers might eventually break.
How It Works
Distributes quantum states that encode signature information, exploiting the no-cloning theorem to prevent forgery, while classical verification steps confirm the message's authenticity.
Real-World Impact
An active research area for ensuring long-term security of digitally signed documents and communications in a future where classical signature schemes might be vulnerable to quantum attacks.