dc.description.abstract | Recent advances in the wireless network technologies have triggered the deployment of communications in many applications. Among them, the intelligent transportation system (ITS) is a typical example that may change the traditional life. ITS integrates information and telecommunication technology to enhance road safety and transportation efficiency. A wide range of applications has emerged, including public safety applications, traffic management applications, driver support applications, infotainment applications in network services. Besides, to achieve data correctness and anonymity from misbehaving and malicious vehicles, message must to be signed by the certificate before its transmission. However, the current Security Credential Management System (SCMS) is vulnerable and enables law enforcement to track the vehicle and compromise users’ privacy.
In this dissertation, we first explore the traffic management applications and aim at improving traffic throughput of the transportation system to reduce traffic congestion and preserve road safety. We propose a centralized dispatching approach to compute routing paths for each vehicle based on its source and destination. Furthermore, the mechanism considers not only the routing costs but also safety factors and introduces detour method as alternative path selection. We evaluate the performance through the simulation analysis, and the result shows that our approach significantly outperforms traditional approach for transportation time.
Though ITS enables to provide smarter and safer transportation applications, data breach is introduced by vehicular communications. If the transmitter and the sender cannot preform anonymous communication, the attacker is able to track the vehicles and compromise vehicles’ privacy. In addition, the system must to be capable to prevent attackers from disseminating false messages. Not only the reliable and sophisticated sensor is required, but also the system needs to remove out the misbehaving vehicles to enhance system robustness. For accountability reasons, the credential management system is responsible for misbehavior detection and certificate revocation. In other words, the system can identify the misbehaving vehicle. Thus, the design of the system requires a delicate balance between privacy and accountability. Currently, National Highway Traffic Safety Administration (NHTSA) has announced its plan to deploy VANETs by 2020 and the SCMS is the leading credential management system in the US. Unfortunately, the current SCMS design fails to achieve its design goal and compromise users’ privacy. In this dissertation, we propose a solution to enhance the system security and preserve users’ privacy. | en_US |