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

刘文杰; 刘超; 陈汉武; 李志强; 刘志昊

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理论物理通讯 ›› 2014, Vol. 62 ›› Issue (02) : 210-214.

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

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

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摘要

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.

Abstract

导出引用

刘文杰, 刘超, 陈汉武, 等. Cryptanalysis and Improvement of Quantum Private Comparison Protocol Based on Bell Entangled States[J]. 理论物理通讯, 2014, 62(02): 210-214

LIU Wen-Jie, LIU Chao, CHEN Han-Wu, et al. Cryptanalysis and Improvement of Quantum Private Comparison Protocol Based on Bell Entangled States[J]. Communications in Theoretical Physics, 2014, 62(02): 210-214

中图分类号： 03.67.Dd 03.67.Lx

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基金

Supported by the National Nature Science Foundation of China under Grant Nos. 61103235, 61170321, 61373016 and 61373131, the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD), and the Practice Inovation Trainng Program Projects for the Jiangsu College Students (201310300018Z)