Research And Implementation Of Privacy Protection Mechanism In Vanet

With the rapid formation and development of the VANET in our country,the development of the VANET can provide more and more diversified services for the lives of modern people,and provide many conveniences for the daily life and work of modern people.However,since modern people use location-based service(LBS)in VANET,they need to provide their real location,which may lead to the leakage of vehicle location privacy.At the same time,the vehicle can also serve as a location service provider.For example,when the vehicle participates in performing tasks based on group intelligence perception,it may also expose its location privacy.Therefore,the establishment of a location privacy protection mechanism in VANET has become the forefront and hotspot of research.Mix-zone is a practical method for privacy protection of spatial location.The mix-zone changes the pseudonym of the vehicle when the vehicle enters and leaves the Mix-zone,confusing the sight of the tracker and destroying the continuity of the position information,thereby ensuring the privacy of the vehicle.However,the confusion zone is usually distributed at traffic intersections such as intersections.Although the traffic volume is large and can provide a large anonymous set size,there are many vehicles,and there are restrictions such as traffic lights,and the speed of vehicles is limited.Therefore,the attacker can use the relative time,location,and speed lock information of the new and old pseudonyms to perform pseudonym linking attacks,which threatens the privacy of the location of the vehicle.This article researches and designs the location privacy protection technology in VANET.The main contents include the following aspects:1)A concealed zone location privacy protection scheme based on location obfuscation technology is proposed.The Dmix-zone is to protect the privacy of the location by obfuscating the location information based on the method of changing the pseudonym in mix-zone.State control is added to the basic mix-zone,and position information noise is added to the outgoing vehicle to destroy the linking between the new and old pseudonyms.And related performance experiments verify that the scheme can effectively resist pseudonymous linking attacks.2)Aiming at the problem of LBS(location-based service)caused by location noise,a traffic flow-based noise attenuation model is proposed.During the process of driving out of the mix-zone,the noise value gradually decreases,and the vehicle position is slowly adjusted to recover to the actual value,which reduces the impact of noise on the quality of LBS.During the slow decay of the noise value,the speed information will also be adjusted accordingly,thereby interfering with the speed information-based attacks and achieving the protection of data privacy.3)Design and implement the privacy protection scheme for the location of the Dmix-zone proposed in this paper in the SUMO experimental platform.The obfuscation module analyzes the position information of vehicles passing the intersection and adds noise,and then optimizes the attenuation process of the noise value through the optimization module to reduce the loss of LBS quality,and then uses the vehicle map module to regenerate the noise-added path.Finally,the platform conducts parameter experiments and performance experiments on Dmix-zone,and proves that the Dmix-zone can effectively resist pseudonymous linking attacks,and can reduce the loss of LBS quality caused by noise through a noise attenuation model based on traffic flow.