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 vehicle-mounted ad hoc network, which includes a location server, a roadside unit RSU, and a plurality of vehicles. The method includes the following steps: after the vehicle enters the coverage of the RSU, it initializes its own location information and send its own ID and location coordinate information to RSU; RSU selects a substitute vehicle for the service request vehicle, and makes a mapping between the substitute vehicle ID and the service request vehicle ID in the database; RSU takes the position information of the substitute vehicle Add noise to confuse the location to obtain the noise-added location; and the RSU requests the location server to obtain the service according to the noise-added stand-in location, and returns the result to the service requesting vehicle after the request is successful. The substitute method based on the differential privacy technology proposed by the present invention realizes the untraceability of the position of the requester, and the location noise and obfuscation method prevents the position privacy of the substitute from being 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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