Location privacy protection method based on differential privacy in vehicular ad hoc network

Abstract

The invention discloses a location privacy protection method based on differential privacy in a vehicular ad hoc network. A location server, a roadside unit (RSU) and a plurality of vehicles are included. The method comprises the following steps: a vehicle initializes its own location information after entering an RSU coverage area, and sends its own ID and location coordinate information to the RSU; the RSU selects a substitute vehicle for the service request vehicle and maps the ID of the substitute vehicle with the ID of the service request vehicle in a database; the RSU adds noise to location information of the substitute vehicle for location obfuscation so as to obtain a noise-added location; and the RSU requests the location server to obtain service according to the noise-added substitute location, and returns a result to the service request vehicle after the request is successful. The substitute method based on a differential privacy technology, proposed by the invention has the following advantages: the untraceability of the location of a requester is realized, and the location and noise obfuscation method enables the location privacy of a substitute not to be leaked.

Description

technical field [0001] The invention relates to the technical field of network and information security, in particular to a location privacy protection method in a vehicle ad hoc network. Background technique [0002] Vehicle ad hoc network (VANET, vehicle ad hoc network) is a mobile ad hoc network widely used in the transportation field, which supports dynamic, random, multi-hop topology. Vehicles within the communication range of the vehicle ad hoc network can be self-organized and connected to form a mobile network, exchanging information such as vehicle speed and location to obtain road condition information and other vehicle driving information, and can also pass roadside units (RSU, Road -Side Unit) raises some requests to the server to obtain some value-added services, so as to solve the problems of traffic safety and traffic convenience, and improve the quality of driving services. [0003] Therefore, the communication of the vehicle ad hoc network is divided into t...

AI Technical Summary

Problems solved by technology

However, if the similarity of the published K locations is too high, there will also be a risk of location privacy leakage

[0007] Moreover, the adversary can also obtain important information such as the identity information of the driver and the location where he is about to go by combining the pre-known background knowledge with the leaked location privacy, which is very useful for users with high privacy protection requirements. big threat

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