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Cryptanalysis and Improvement of the Multi-User QPCE Protocol with Semi-Honest Third Party |
| Yan Chang1,2**, Chun-Xiang Xu1, Shi-Bin Zhang2, Hai-Chun Wang2, Li-Li Yan2, Gui-Hua Han2, Yuan-Yuan Huang2, Zhi-Wei Sheng2 |
1Department of Computer Science and Technology, University of Electronic Science and Technology of China, Chengdu 611731
2College of Information Engineering, Chengdu University of Information Technology, Chengdu 610225 |
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| Cite this article: |
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Yan Chang, Chun-Xiang Xu, Shi-Bin Zhang et al 2016 Chin. Phys. Lett. 33 010301 |
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Abstract 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.
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Received: 07 September 2015
Published: 29 January 2016
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| PACS: |
03.67.Dd
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(Quantum cryptography and communication security)
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03.67.Hk
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(Quantum communication)
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03.67.Pp
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(Quantum error correction and other methods for protection against decoherence)
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