Abstract
Quantum privacy query (QPQ) is a cryptographic application that protects the privacy of both users and databases while querying the database secretly. In most existing QPQ protocols, the protection of user privacy can only be cheat-sensitive. Cheat-sensitive means that Bob will be found later with a certain probability if he tries to get the address queried by Alice. On the premise of cheat-sensitive, although Alice can discover Bob’s malicious behavior after a query (transaction), the secret information of Alice was leaked in the completed query, which is likely to be a fatal blow to Alice. Or, to prevent Bob’s malicious behavior, Alice executes one or more additional queries to test Bob’s honesty. However, to bypass Alice’s honesty test, Bob can also provide several honest queries before performing dishonest queries. Therefore, cheat-sensitive should not be the ultimate goal of user privacy protection in QPQ. In this paper, we propose a two-way QKD-based QPQ protocol with better user privacy protection than cheat-sensitive based on order rearrangement of qubits. The proposed QPQ protocol can resist the Trojan horse attack even without wavelength filter and photon number splitter equipped with auxiliary monitoring detectors.
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Acknowledgments
This work is supported by NSFC (Grant Nos.61572086, 61402058), the Application Foundation Project of Sichuan Province of China (Grant No. 2017JY0168), the National Key Research and Development Program (No. 2017YFB0802302), Sichuan innovation team of quantum security communication (No.17TD0009), Sichuan academic and technical leaders training funding support projects (No. 2016120080102643) the Fund for Middle and Young Academic Leaders of CUIT (Grant No. J201511).
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Chang, Y., Zhang, SB., Wan, Gg. et al. Practical Two-Way QKD-Based Quantum Private Query with Better Performance in User Privacy. Int J Theor Phys 58, 2069–2080 (2019). https://doi.org/10.1007/s10773-019-04062-2
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DOI: https://doi.org/10.1007/s10773-019-04062-2