Cryptanalysis and Improvement of Quantum Private Comparison Protocol Based on Bell Entangled States

Recently, Liu et al. [Commun. Theor. Phys. 57(2012) 583] proposed a quantum private comparison protocol based on entanglement swapping of Bell states, which aims to securely compare the equality of two participants’ information with the help of a semi-honest third party(TP). However, the present stu...

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Bibliographic Details
Published in理论物理通讯：英文版 no. 8; pp. 210 - 214
Main Author 刘文杰 刘超 陈汉武 李志强 刘志昊
Format Journal Article
LanguageEnglish
Published 2014
Subjects
attack
Bell
comparison
entanglement
improvement
measurement
private
quantum
states
swapping
TP’s
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Summary:Recently, Liu et al. [Commun. Theor. Phys. 57(2012) 583] proposed a quantum private comparison protocol based on entanglement swapping of Bell states, which aims to securely compare the equality of two participants’ information with the help of a semi-honest third party(TP). However, the present study points out there is a fatal loophole in Liu et al.’s protocol, and TP can make Bell-basis measurement to know all the participants’ secret inputs without being detected. To fix the problem, a simple solution, which uses one-time eavesdropper checking with decoy photons instead of twice eavesdropper checking with Bell states, is demonstrated. Compared with the original protocol,it not only reduces the Bell states consumption but also simplifies the protocol steps.
Bibliography:11-2592/O3
LIU Wen-Jie;LIU Chao;CHEN Han-Wu;LI Zhi-Qiang;LIU Zhi-Hao;Jiangsu Engineering Center of Network Monitoring, Nanjing University of Information Science & Technology;School of Computer and Software, Nanjing University of Information Science & Technology;School of Computer Science and Engineering, Southeast University;College of Information Engineering, Yangzhou University
ISSN:0253-6102