Addendum to "Experimental demonstration of a quantum protocol for Byzantine agreement and liar detection" arXiv:0710.0290

TL;DR

This paper extends a quantum Byzantine agreement protocol to counter intercept-resend attacks, enhancing its security and robustness in quantum communication systems.

Contribution

It introduces an improved quantum protocol that effectively defends against specific intercept-resend attacks, advancing secure quantum communication methods.

Findings

Extended protocol resists intercept-resend attacks

Enhanced security in quantum Byzantine agreement

Demonstrated robustness against known attack strategies

Abstract

Gao et al. [Phys. Rev. Lett. 101, 208901 (2008)] have described a possible intercept-resend attack for the quantum protocol for detectable Byzantine agreement in Phys. Rev. Lett. 100, 070504 (2008). Here we describe an extension of the protocol which defeats such attacks.