Robustness of two-way quantum communication protocols against Trojan horse attack

TL;DR

This paper analyzes the security of two-way quantum communication protocols against Trojan horse attacks, introduces a new delay-photon Trojan horse attack, and proposes practical countermeasures to enhance security.

Contribution

It presents a novel attack method and a practical defense strategy, demonstrating the robustness of two-way quantum communication protocols in real-world scenarios.

Findings

Introduction of delay-photon Trojan horse attack

Proposed practical prevention method

Confirmed robustness of protocols against new attack

Abstract

We discuss the robustness of two-way quantum communication protocols against Trojan horse attack and introduce a novel attack, delay-photon Trojan horse attack. Moreover, we present a practical way for two-way quantum communication protocols to prevent the eavesdropper from stealing the information transmitted with Trojan horse attacks. It means that two-way quantum communication protocols is also secure in a practical application.