Using trust model to ensure reliable data acquisition in VANETs

Vehicular Ad Hoc Networks (VANETs) are usually used to reduce the traffic accidents, improve traffic efficiency and safety, promote commercial or infotainment products and etc. All the applications are based on the exchange of data among nodes, so not only reliable data delivery but also the authenticity and reliability of the data itself are prerequisite. For this purpose, a dynamic entity-centric trust model based on weight is firstly proposed according to the types of applications and the authority levels of nodes. The simulations results show that the trust model can enhance the security of the routing protocol GPSR with low delay and improve the success data delivery rate. On the basis of it, a simple data-centric trust model is constructed by employing the experiences and utility theory, which is simple enough to realize fast trust evaluation for the data in VANETs. The analyses show that it can reflect the data trustworthiness objectively and help vehicles to detect the false or bogus data.