Journals Proceedings

Abstract

This article presents a review of various issues on security of Ad hoc networks (AHN) are wireless multi-hop packet networks without any fixed infrastructure. An AHN network is formed solely by its terminals so that each terminal connected to the network provides also relaying service for others i.e. acts as a router. Advantages of such system are rapid deployment, robustness, flexibility and inherent support for mobility. The wireless medium is openly accessible, less reliable and has no obvious physical boundary. An attacker does not need to break any physical barriers to gain access to the wireless medium and can enter the network from anywhere and from all directions. In addition, more complications in security establishment come from the dynamically changing topology, the reliance on node collaboration for network connectivity, the lack-of-trust infrastructure and the lack of a clear line of defense. Since ad hoc networks are built without a fixed infrastructure and centralized management, the protection mechanisms used in tethered networks cannot be adopted directly in wireless ad hoc and sensor networks. External as well as internal attacks on ad hoc network routing protocols disrupt performance of networks and reliability due to the nature of the network. We take a scenario of attacks and vulnerabilities present in the network and discuss the techniques to resolve the problems due to security breached and also about the comparison between the solutions and parameters of ad hoc network show the performance according to secure protocols. We discuss in this paper routing protocol and challenges and also discuss authentication in ad hoc network.