A multi-user quantum privacy query method with authentication

Abstract

The invention relates to the fields of quantum communication and quantum cryptography, in particular to a multi-user quantum privacy query method with authentication, which includes: negotiating important security parameters between participants; a database provider prepares an initial multi-particle GHZ state, and converts corresponding particles into Distributed to other participants; all participants conduct security checks to verify whether the quantum state is safely shared; database owners and users use entanglement exchange technology to convert the two-way authentication between the database and each user into a trusted third party to verify other The legitimacy of the participant's identity; if the participant's identity authentication is successful, the database provider and the user conduct inadvertent key negotiation; the database provider and the user perform key post-processing, and complete the privacy query. The invention adds an identity authentication mechanism to enhance the security of multi-user quantum privacy query, not only has the same level of database privacy and user privacy, but also can defend against external counterfeiting attacks and man-in-the-middle attacks.

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 attacks by quantum computers, while quantum cryptography solves this problem with security provided by quantum information theory. Recently, quantum cryptography has brought a new possibility to the Symmetrically Private Information Retrieval (SPIR) problem, namely Quantum Private Query (QPQ). Specifically, compared with the classical SPIR protocol, the QPQ protocol not only reduces the communication and computational complexity, but also is easy to implement with the existing technology. Most of the proposed QPQ protocols, whether it is a single-user or a multi-user QPQ protocol, only focus on the privacy of the database and users, while ignoring the activ...

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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