Abstract
Vehicular Ad-Hoc NETworks (VANETs) have recently turned out as an auspicious way to raising road safety and efficiency while providing the opportunity to enhance driver's performance and attention. This can be achieved via a diversity of applications that implicate communication between vehicles, like alerting other vehicles about a parking brake or an eventual emergency case. Nevertheless, the lack of an efficient secure routing protocol may cause the interesting properties of VANETs to ultimately outcome in greater dangers of maltreats. Indeed, the routing process is subject to various threats since it is the basic mechanism that assures both Vehicle-to-Vehicle (V2V) and Vehicle-to-Infrastructure (V2I) communications. These phenomena amplify when the number of vehicles increases due to the rise in the rate of exchanged packets. Thus, securing the routing operation in VANET has become of a major concern. In this paper, we propose a new Trust Cryptographic Secure Routing protocol for VANETs, baptized TCSR protocol. The key idea is to reuse the AIMD (Additive Increase Multicative Decrease) algorithm. To avoid scalability problems and high level of processing, this scheme fixes a threshold trust level allowing each node to communicate with the others in the network associated to plausibility checks in order to calculate the node score. Since the node with the most appropriate score is selected, asymmetric cryptography is used to secure the transferred packet carrying the routing information. The performance analysis shows that TCSR protocol is efficient in terms of verification delay and average throughput.