Fully Distrustful Quantum Cryptography

TL;DR

This paper explores extending device-independent quantum cryptography to fully distrustful settings, presenting protocols for bit-commitment and coin flipping that do not rely on trusting quantum devices.

Contribution

It introduces a novel approach to fully distrustful quantum cryptography by developing device-independent protocols for bit-commitment and coin flipping.

Findings

Successfully constructed a device-independent bit-commitment protocol.

Extended the approach to create a device-independent coin flipping protocol.

Demonstrated feasibility of fully distrustful quantum cryptography models.

Abstract

In the distrustful quantum cryptography model the different parties have conflicting interests and do not trust one another. Nevertheless, they trust the quantum devices in their labs. The aim of the device-independent approach to cryptography is to do away with the necessity of making this assumption, and, consequently, significantly increase security. In this paper we enquire whether the scope of the device-independent approach can be extended to the distrustful cryptography model, thereby rendering it `fully' distrustful. We answer this question in the affirmative by presenting a device-independent (imperfect) bit-commitment protocol, which we then use to construct a device-independent coin flipping protocol.