Unconditionally-secure and reusable public-key authentication

TL;DR

This paper introduces a quantum public-key identification protocol that achieves unconditionally-secure and reusable authentication, demonstrating the theoretical possibility of such security with pure-state public keys against any adversary.

Contribution

It presents the first quantum protocol that provides unconditionally-secure, reusable public-key authentication using pure-state public keys.

Findings

Protocol is secure against unbounded adversaries.

First demonstration of unconditionally-secure reusable public-key authentication.

Uses quantum properties to achieve security with pure states.

Abstract

We present a quantum-public-key identification protocol and show that it is secure against a computationally-unbounded adversary. This demonstrates for the first time that unconditionally-secure and reusable public-key authentication is possible in principle with (pure-state) public keys.