Modern Physics Letters A

Cryptanalysis of quantum private comparison with six-particle maximally entangled states

Chia‐Wei Tsai, Chun‐Wei Yang, Chun‐Hsiang Wang, Jason Lin

Published Mar 7, 2023• 2 citations

Abstract

The measurement property of the six-particle maximally entangled state was used by Sun [Mod. Phys. Lett. A 37, 2250149 (2022)] to design a quantum private comparison (QPC) protocol. However, this study points out that the entanglement property of the six-particle maximally entangled state is inconsequential as a security measure; that is, participants waste resources to store the entanglement state and perform the Bell measurement without obtaining any additional security advantage. Although a third party (TP) cannot obtain information regarding the participants’ secret messages through an attack, an attack renders the six-particle entanglement redundant. Accordingly, this study proposed an improved QPC protocol to prevent third-party attacks.

DOI: 10.1142/s0217732323500463

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