Efficient Authentication and Congestion Control for Vehicular Ad Hoc Network

VANET is a subclass of MANET in which each vehicle acts as a node. In VANET Road Side Units (RSUs) are responsible for distributing group private keys and managing vehicles in a localized manner for every 100 to 300 m. Then, use a Hash Message Authentication Code (HMAC) to avoid time consuming CRL checking and to ensure the integrity of messages. Cooperativemessage authentication scheme is mainly used for reducing the authentication burden. The scheme is more efficient in terms of authentication speed and privacy. Congestion control scheme is introduced to monitor and regulate the traffic levels, So with the help of this approach whenever there is a problem of congestion and emergency message occurs, the congestion control can reserve time slots by dynamically partitioning the beacon interval without the expense of beacons for reducing the traffic.