Abstract

Ad-hoc network is a kind of temporary network used to establish connections for a temporary purpose. The ad hoc network is a kind of wireless network. This is not an infrastructure-based network. Mobile ad-hoc networks and Vehicular ad-hoc networks are two popular areas of ad-hoc networks. VANET is the most popular network nowadays. VANET is the network on wheels i.e. Vehicle is considered as a node; there is no issue of power management in this network, unlike MANET networks. Further to increasing the efficiency at such high speed, various issues and challenges occur in the path of this self-organized network. VANETs present the largest real-time application but lack security, scalability, efficient routing, and clustering protocols. The main aim of the study is to focus on various issues and challenges related to security requirements in VANET, which will allow researchers to work in this field for increasing the reliability of the network. Also, various attacks are focused which show the threats in the vehicular networks because of their dynamic topology.