Entanglement Enhances Security in Secret Sharing

TL;DR

This paper demonstrates that entanglement improves the security of quantum secret sharing protocols, especially against local eavesdropping, by analyzing error rates and establishing a security criterion.

Contribution

It introduces a security criterion for quantum secret sharing and shows the advantage of entangled states against local attacks.

Findings

Entangled encoding states enhance security against local eavesdropping.

A new security criterion for quantum secret sharing is proposed.

Analysis of tolerable quantum bit error rates in the protocol.

Abstract

We analyze tolerable quantum bit error rates in secret sharing protocols, and show that using entangled encoding states is advantageous in the case when the eavesdropping attacks are local. We also provide a criterion for security in secret sharing -- a parallel of the Csiszar-Korner criterion in single-receiver cryptography.