Privacy for Real-time Location Data in VANETs

Abstract

VANET is a solution that can enable vehicles to connect to a network and obtain a wide range of information in real time. The development of vehicular ad-hoc network(VANET) allows vehicle users to enjoy location based services (LBS) through the network at any time and place. However, it also raises location privacy issues. Privacy preservation of large amounts of real-time location data is a critical issue. Existing research work, such as the Mix-zone scheme, has protected users’ location privacy and driving routes to a certain extent. However, existing schemes have some deficiencies in security and efficiency. This project presents a novel location privacy protection scheme. Vehicles can generate virtual locations dynamically based on the situation of surrounding vehicles to provide misleading information regarding the driving route and thus achieve location privacy. The Entropy of anonymity set and Tracking success ratio are used as metrics to measure the level of privacy-preserving. Simulation experiments have been carried out to compare with other existing schemes. So, that the proposed scheme offers better security and location based services.

Existing System

In the existing system, mix zone technique was used. The user need to obtain the public or private keys generated by RSU. It is suitable for only a certain extent. But in the proposed system, it does not need to create the keys. Tracking success ratio decrease from 10 percent to 1 percent. Providing location privacy to users is one of the important issues that must be addressed in Vehicular Ad-Hoc Networks. Recent solutions address it by using cryptographic “mix-zones”, which are anonymizing regions where nodes change their temporary identities (pseudonym) without being tracked. However, solutions are vulnerable to internal attackers since within a mix-zone messages are encrypted using a group secret key. In this paper we improve location privacy of mix-zones via extensions to the CMIX protocol. By carrying out extensive simulations, we investigate and compare the effective location privacy provided by the proposed approach.

Proposed System

A Location based service contains three components: user, network infrastructure and Third party LBS provider. Each user communicates with the network infrastructure through their real identity and device number and uses pseudonyms to protect the privacy of identity. The user’s location information will be periodic updated. The LBS request was send to the LBS application server. Then the vehicle sends the LBS request to the roadside unit (RSU) through the network and the RSU forwards it to the LBS application server. Communications between vehicles are based on the DSRC protocol. In the proposed system, the vehicle VA chooses another vehicle VB nearby as a virtual vehicle, also called shadow, of VA before sending an LBS request. VA obtains the location of vehicle VB which is denoted as LocB through the periodic broadcast based on DSRC protocol in VANET. VA sends two LBS request messages at the same time, and one of them uses the location of vehicle VA which is called LocA, and the other uses location LocB of the shadow vehicle VB. The rest of the messages remain the same content and they can be denoted as Req1 and Req2. The LBS server needs to respond with the corresponding service message according to different location when receiving the requests Req1 and Req2. After receiving the response, vehicle VA discards the useless message corresponding to LocB and uses the true message according to its own location LocA.

Architecture

ARCHITECTURE DIAGRAM