An analysis of security threats and countermeasures in VANET

Rapid advancement of Information technology and Communication, VANET(VehicularAd-hoc Networks) has received immence attention from academia, industry and government in all over world. Due to the change of life style, number of Vehicles on roads increases in last few years. Driving of Vahicles has not stopped from being more challenging and dangerous in day to day. Again Road infrastructure are already saturated. Safety distance between two adjacence vehicle and reasonable speed of vehicles are hardly respected. Drivers is going often with lack of enough attention. Tens of thousands of people die and hundreds of thousands get injured in traffic accidents all over the world in each year. So the life or death risk may be must special feature of VANET's. In the traditional networks or other emerging mobile networks, Security and privacy failures usually bring financial losses, where as in VANET, both security and privacy failures could be much more serious life or death risk. So VANET have emerged as an exciting research and application area. In this paper we have tried to discussed about the overview of VANET infrastructure, some applicatons and some sereous technical and security issues to implement an ideal VANET. We have also mentioned some major attacks on VANET. We hope the insight discussed here will help protocol designers and applications engineers to improve the services provided in VANET and assist drivers to make secure techniques.