Implementation of two-party protocols in the noisy-storage model

TL;DR

This paper offers practical guidelines for implementing two-party cryptographic protocols in the noisy-storage model, addressing real-world issues like errors and inefficiencies, and providing security parameters for various experimental setups.

Contribution

It presents a practical framework for implementing noisy-storage protocols, including security analysis under realistic conditions and modifications with decoy states.

Findings

Security parameters for weak coherent sources

Analysis of detector inefficiencies

Modified protocols with decoy states

Abstract

The noisy-storage model allows the implementation of secure two-party protocols under the sole assumption that no large-scale reliable quantum storage is available to the cheating party. No quantum storage is thereby required for the honest parties. Examples of such protocols include bit commitment, oblivious transfer and secure identification. Here, we provide a guideline for the practical implementation of such protocols. In particular, we analyze security in a practical setting where the honest parties themselves are unable to perform perfect operations and need to deal with practical problems such as errors during transmission and detector inefficiencies. We provide explicit security parameters for two different experimental setups using weak coherent, and parametric down conversion sources. In addition, we analyze a modification of the protocols based on decoy states.