摘要
In a recent work [Quantum Inf. Process 12 （2013） 1077], a multi-user protocol of quantum private comparison of equality （QPCE） is presented. Here we point out that if we relax the constraint of a semi-honest third party, the private information of the users will be totally leaked out to the third party. A special attack is demonstrated in detail. Furthermore, a possible improvement is proposed, which makes the protocol secure against this kind of attack.
In a recent work [Quantum Inf. Process 12 （2013） 1077], a multi-user protocol of quantum private comparison of equality （QPCE） is presented. Here we point out that if we relax the constraint of a semi-honest third party, the private information of the users will be totally leaked out to the third party. A special attack is demonstrated in detail. Furthermore, a possible improvement is proposed, which makes the protocol secure against this kind of attack.
基金
Supported by the National Natural Science Foundation of China under Grant Nos 61402058,61572086 and 61370203
the Fund for Middle and Young Academic Leaders of Chengdu University of Information Technology under Grant No J201511
the Science and Technology Support Project of Sichuan Province under Grant No 2013GZX0137
the Fund for Young Persons Project of Sichuan Province under Grant No 12ZB017
the Foundation of Cyberspace Security Key Laboratory of Sichuan Higher Education Institutions under Grant No szjj2014-074
