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Cryptanalysis and Improvement of Ye et al’s Quantum Private Comparison Protocol |
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| Authors: | Wu WanQing Cai QingYu Wu ShuoMei Zhang HuanGuo |
| Institution: | 1.School of Cyber Security and Computers, Hebei University, Baoding, 071002, People’s Republic of China ;2.State Key Laboratory of Magnetic Resonances and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan, 430071, People’s Republic of China ;3.College of Computer Science and Engineering, Shijiazhuang University, Shijiazhuang, 050035, People’s Republic of China ;4.Computer School of Wuhan University, Wuhan, 430072, People’s Republic of China ; |
| Abstract: | Recently, Ye et al. (Int. J. Theor. Phys. 56, 1517–1529, 2017) proposed a quantum private comparison (QPC) protocol based on five-qubit entanglement state. Two parties can verify that their secret information is equal or not with the help of the semi-honest third party (TP). However, in this paper we will point out the Ye et al.’s initial protocol is not safe under a special participant attack. That is a malicious participant can get the other party’s secret input information illegally under the forgery attack. Furthermore, we give two possible improvement protocols, which can perform this protocol secure against this kind of attack. |
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