Multi-user quantum privacy query method with authentication

Abstract

The invention relates to the field of quantum communication and quantum cryptography, in particular to a multi-user quantum privacy query method with authentication, which comprises the following steps that: participants negotiate important security parameters; the database provider prepares an initial multi-particle GHZ state and distributes corresponding particles to other participants; all participants perform security detection to verify whether the quantum state is shared securely; a database owner and a user utilize an entanglement swapping technology to convert bidirectional identity authentication between a database and each user into verification of legality of identities of other participants by a trusted third party; if the identity authentication of the participant succeeds, the database provider carries out casual key negotiation with the user; and the database provider and the user carry out key post-processing and complete privacy query. According to the method, an identity authentication mechanism is added, the security of multi-user quantum privacy query is enhanced, database privacy and user privacy of the same level are achieved, and external counterfeit attacks and man-in-the-middle attacks can be defended.

Description

technical field [0001] The invention relates to the fields of quantum communication and quantum cryptography, in particular to a multi-user quantum privacy query method with authentication. Background technique [0002] The security of classical cryptography is guaranteed by computational assumptions and is vulnerable to quantum computers, while quantum cryptography solves this problem, and its security is provided by quantum information theory. Recently, quantum cryptography has brought a new possibility to the problem of Symmetrically Private Information Retrieval (SPIR), that is, Quantum Private Query (QPQ). Specifically, compared with the classic SPIR protocol, the QPQ protocol not only reduces the complexity of communication and calculation, but also is easy to implement with existing technologies. Most of the proposed QPQ protocols, no matter single-user or multi-user QPQ protocols, only focus on the privacy of the database and users, and ignore the active attack of e...

AI Technical Summary

Problems solved by technology

However, in real scenarios, there may be the following situations: (1) Eve may impersonate the identity of the database provider (Alice) to communicate with the user (Bob), and then use illegally obtained data to obtain benefits, or Eve impersonates Bob (2) Eve may directly sneak into the communication between Alice and Bob, negotiate with them inadvertently and eavesdrop on the data purchased by Alice from Bob

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