Research On VANET Secure Routing Protocol Base On Trust-detection

Vehicular Ad-Hoc Networks(VANET) is an important application in Intelligent Transportation System(ITS) for Mobile Ad-Hoc Networks(MANET),which has obtained wide attention since more than ten years ago. On the one hand, VANET can warn some hidden dangers in advance, notify traffic accidents promptly, reduce effectively even avoid the losses of traffic accidents and improve the level of traffic safety. On the other hand, it can get real-time traffic information, assist drivers to drive, enhance the validity and amenity of driving. Routing protocol as the vital technology, play a determining role in the function of the whole network. However, the particularity of vehicular environment poses a great challenge to the stability and security of VANET routing protocol.Firstly, this paper points out that for the fast-moving vehicles the communication links are prone to rupture which results in the failure of channel monitoring and data transmission. Thus a Multi-Channel Selection based Listening Mechanism(MSLM) was put forward in this paper to solve these problems. The main idea of MSLM is to make vehicle nodes of consistent trends work in the same service channel(SCH), which can not only keep a stable link to do the data listening and transmission but also offer a solution to the problem of channel monitoring while vehicles work in different channels. Meanwhile, the vehicle nodes send data in the same SCH do not require the process of channel synchronization, and effectively reduce the delay of data transmission.Secondly, this paper proposes a Trust-Detection Based VANET Secure Routing Protocol(TDSR), which aims at the shortage of traditional cryptosystem in dealing with the malicious routing packet dropping behavior. First of all, TDSR uses MSLM to monitor its neighbor vehicle nodes and acquires the first-hand routing information of these nodes to establish the direct trust degree. At the same time, TDSR detects the Hello message which is send periodically by the neighbor nodes and gets the recommend trust degree from trust list which is attached in Hello message. Then TDSR can calculate and maintain the trust list of its neighbor nodes which can assist the current node to make routing decisions and avoid the malicious attack effectively.Finally, this paper uses SUMO+MOVE and NS2 simulation software to make a simulation comparison of the designed TDSR protocol and the other two multi-channel protocols which are CSPR and M-GPSR. The result shows that TDSR protocol has better network performance either in normal network environment or under malicious attack scenarios, which consequently proves that the protocol this paper discusses about is more stable and secure.