TL;DR: Quantum digital signatures provide information-theoretically secure digital signatures using quantum states, unlike classical signatures that rely on computational hardness assumptions. They are immun
Quantum digital signatures provide information-theoretically secure digital signatures using quantum states, unlike classical signatures that rely on computational hardness assumptions. They are immune to attacks by quantum computers and offer a fundamentally different approach to authentication. Research is advancing toward practical implementations compatible with quantum networks.
Type
Cryptography / Security
Complexity
Information-theoretic security; requires quantum channels
Application
Unforgeable digital signatures, post-quantum authentication, secure messaging