A New Protocol for Quantum Private Query Against Joint-Measurement Attack
The quantum-key-distribution (QKD)-based quantum private query (QPQ) has become a research hotspot in recent years. Although such QPQ protocols are practical, joint-measurement (JM) attack is a noteworthy threat to the security of the database. In this paper, we propose a new QPQ protocol for enhancing database security against JM attack. The special procedure “receive→measure→re-prepare→send” for the user Alice prevents her from saving states to perform JM attack. Furthermore, since each photon only travels from one party to the other, our protocol reduces the drawback of two-way communication so that the transmission distance between Alice and the database holder Bob is satisfactory. We also analyze the security of the proposed protocol in terms of the database privacy and user privacy. Moreover, our protocol preserves the excellent character of QKD-based QPQs that it is loss tolerant.
KeywordsQuantum private query Joint-measurement attack User security Database security
This work is supported by the National Natural Science Foundation of China (Grant Nos. 61672110, 61572081, 61671082, 61702469, 61771439).
- 2.Chor, B., Goldreich, O., Kushilevitz, E., Sudan, M.: Private information retrieval. In: Proceedings of the 36th Annual IEEE Symposium on Foundations of Computer Science (FOCS 1995), pp. 41–51 (1995)Google Scholar