Location privacy protection method based on l-inquiry

Abstract

The invention relates to a location privacy protection method based on l-inquiry. The method comprises the following steps that (1) when a user requires location service, an inquiry request is initiated for an anonymous server; (2) the anonymous server constructs an anonymous inquiry request including k users and l inquiry subjects by a method of merging the inquiry requests from the same region at the same moment and inserting the false inquiry on the location k-anonymity basis, and in addition, the anonymous inquiry request is submitted to a location server; (3) the location server respectively carries out inquiry processing on the l inquiry subjects one by one, and then returns a result set obtained through merging the inquiry results to the anonymous server; (4) the anonymous server filters away the false inquiry result from the result set, and then carries out sorting and secondary refinement according to the inquiry subjects of different users, the final location inquiry result is obtained, and is then respectively returned to each user. The method has the advantage that the location privacy protection mechanism security can be improved.

Description

technical field [0001] The invention belongs to the technical field of location information services, in particular to a l - The query location privacy protection method can be applied to various location-based information services such as navigation, social interaction and surrounding query. Background technique [0002] Location-based services (Location-Based Services, referred to as LBS) is the technical basis to provide users with many services including traffic guidance, point of interest query, vehicle tracking, emergency call, etc. by obtaining the location information of mobile users. The more accurate the location information provided by the server when making a service request, the more accurate the service information returned by the server to the user. Therefore, while people enjoy the convenience brought by location-based services, they are also threatened by the possible exposure of privacy. [0003] Location k - Anonymity is a common location privacy protec...

AI Technical Summary

Problems solved by technology

but in position k -In the anonymous mechanism, when a user requests the same query multiple times during the mobile process, the anonymous server will construct multiple anonymous groups with the same theme but different user sets for the user, because these anonymous groups contain the identity of the real user Information, as long as the attacker takes the intersection of these anonymous groups, it is possible to infer the identity information of the real user

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