Chia-Wei TsaiChun-Wei YangChun-Hsiang WangJason Lin2025-05-052025-05-052023-03-0710.1142/S0217732323500463https://nutcir-lib.nutc.edu.tw/handle/123456789/238<jats:p> 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. </jats:p>Cryptanalysis of quantum private comparison with six-particle maximally entangled statesjournal-article