Simple quantum password checking

TL;DR

This paper introduces a quantum password checking protocol that leverages quantum mechanics to ensure secrecy, using small-dimensional quantum systems for encoding passwords, and demonstrates its robustness against various replay attacks.

Contribution

The paper proposes a novel quantum password checking protocol that maintains secrecy through quantum encoding and analyzes its security against replay attacks.

Findings

Protocol is robust against replay attacks.

Quantum encoding prevents reading of password bits.

Secrecy is protected by quantum mechanical laws.

Abstract

We present a quantum password checking protocol where secrecy is protected by the laws of quantum mechanics. The passwords are encoded in quantum systems that can be compared but have a dimension too small to allow reading the encoded bits. We study the protocol under different replay attacks and show it is robust even for poorly chosen passwords.