VANET-Sarnoff08 - Reliable Traffic Information Propagation...

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Reliable Traffic Information Propagation in Vehicular Ad-Hoc Networks Soyoung Park and Cliff C. Zou University of Central Florida 4000 Central Florida Blvd Orlando FL 32816-2362 Abstract -In a Vehicular Ad-Hoc Network (VANET), an important application is to let moving vehicles collaborate with each other by sharing traffic information and alerting others of any emergency or accidental scenarios. To make this application possible, a security mechanism must be designed in the beginning to guarantee that no malicious vehicles or persons can intercept, manipulate, or modify traffic information propagating in a VANET without being detected. In this paper, we present a novel approach to provide reliable traffic information propagation in a VANET: two-directional data verification . Two-directional data verification approach uses vehicles in both directions of a two-way road as two separated media channels to propagate traffic data. By receiving messages from both channels, a recipient vehicle verifies the message integrity by checking if data received from both channels are matched. This approach exploits the fact that it is difficult for an adversary to have two collaborative vehicles on both driving directions in the same region. Even if an adversary can do this, it is costly and attacks can be done only in a short time period. The proposed approach is simple and readily to be implemented, requiring no complicated public-key infrastructure to protect traffic information propagation in VANET. I. I NTRODUCTION A. Background and Related Work With a significant development of network technologies, vehicular ad-hoc network (VANET) has been emerging as a killing application in a ubiquitous environment. In the VANET environment, vehicles can sense and create their own traffic information then they communicate with each other to collect their local traffic information. Since the traffic messages can be delivered to vehicles faster and further, drivers can react and prepare against sudden traffic events in advance. Finally, vehicles can drive collaboratively to speed up the flow of traffic. The existing traffic broadcasting systems, such as traffic radio, can give traffic information periodically for some specific locations and directions. However drivers only need to know the newest detail information related to their future driving route, which cannot be provided by current broadcasting systems. Researchers have conducted many researches about self- organizing traffic information system (SOTIS) [1], security and privacy issues [2-7], fast authentication [8-10], secure data aggregation [11-12], and detecting and correcting malicious data [12-13] in VANET. Among these security challenges, we especially concern about reliable traffic information propagating through multiple vehicles over a relatively long distance. Unlike typical traffic messages of each vehicle such as moving direction, location, speed and temporary brake which are useful for neighboring vehicles, aggregated traffic messages obtained in a certain road section
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