Multi-Party Quantum Private Comparison Protocol Based on Entanglement Swapping of Bell Entangled States  

作　　者：叶天语 

机构地区：[1]College of Information and Electronic Engineering, Zhejiang Gongshang University

出　　处：《Communications in Theoretical Physics》2016年第9期280-290,共11页理论物理通讯（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant No.61402407

摘　　要：Recently, Liu et al. proposed a two-party quantum private comparison(QPC) protocol using entanglement swapping of Bell entangled state(Commun. Theor. Phys. 57(2012) 583). Subsequently, Liu et al. pointed out that in Liu et al.'s protocol, the TP can extract the two users' secret inputs without being detected by launching the Bell-basis measurement attack, and suggested the corresponding improvement to mend this loophole(Commun. Theor. Phys. 62(2014) 210). In this paper, we first point out the information leakage problem toward TP existing in both of the above two protocols, and then suggest the corresponding improvement by using the one-way hash function to encrypt the two users' secret inputs. We further put forward the three-party QPC protocol also based on entanglement swapping of Bell entangled state, and then validate its output correctness and its security in detail. Finally, we generalize the three-party QPC protocol into the multi-party case, which can accomplish arbitrary pair's comparison of equality among K users within one execution.

关 键 词：multi-party quantum private comparison Bell entangled state entanglement swapping information leakage 

分 类 号：O413[理学—理论物理] TP309[理学—物理]