Layerwise Security Framework with Snauth- SPMAODV to Defend Denial of Service Attack in Mobile Adhoc Networks for Hostile Environment

Mobile Ad-hoc Networks (MANETs) have the ability to setup networks on the fly in a hostile environment where it may not possible to deploy a traditional network infrastructure. Their natural characteristics make them vulnerable to passive and active attacks. Particularly Denial of Service attack is one such severe attack against MANET Layers which is a challenging one to defend against. There is no solution that provides layer wise security which is a major challenge for Mobile Adhoc networks. This research effort examines the theory, application, and results for a Layerwise Security (LaySec) framework that provides security for an ad-hoc network operating in a hostile environment. LaySec incorporates three security features (Secure neighbor authentication and Layerwise Security techniques and multipath routing) into its framework while maintaining network performance sufficient to operate in hostile environment. It uses Layerwise security techniques to protect nodes from multilayer attacks called Denial of Service attacks. It uses secure neighbor authentication to provide neighboring nodes exchange messages to discover and authenticate each other. The Adhoc On demand Distance Vector (AODV) protocol is modified to utilize all discovered routes instead of the shortest route to balance the network load across multiple paths. The multiple security levels of LaySec make it very robust against Denial of Service attacks in hostile environment. The simulation is done for different number of mobile nodes using network simulator Qualnet 5.0. From the simulation results, it is observed that the proposed approach has shown better results in terms Quality of Service parameter likely Average packet delivery ratio, Average throughput, Average end to end delay, Average jitter and Routing Overhead.