Device-Independent Relativistic Quantum Bit Commitment

TL;DR

This paper explores device-independent relativistic quantum bit commitment schemes that are secure against location-based attacks and post-quantum adversaries, highlighting advantages over classical schemes.

Contribution

It introduces relativistic quantum bit commitment protocols immune to location attacks and secure under no-signalling constraints, advancing quantum cryptography security models.

Findings

Schemes are immune to location attacks.

Security holds against post-quantum adversaries.

Quantum schemes have advantages over classical ones.

Abstract

We examine the possibility of device-independent relativistic quantum bit commitment. We note the potential threat of {\it location attacks}, in which the behaviour of untrusted devices used in relativistic quantum cryptography depends on their space-time location. We describe relativistic quantum bit commitment schemes that are immune to these attacks, and show that these schemes offer device-independent security against hypothetical post-quantum adversaries subject only to the no-signalling principle. We compare a relativistic classical bit commitment scheme with similar features, and note some possible advantages of the quantum schemes.