Securing Physical and network layer using SNAuth-SPMAODV with DSSS for Mobile adhoc networks in Military Scenario

A mobile ad hoc network is an infrastructure less network, fast emerging today for deployment in variety of applications. During deployment, security emerges as a central requirement due to many attacks that affects the performance of the ad hoc networks. Particularly Denial of Service attack is one such severe attack against network and physical layer which is a challenging one to defend against in military communication environments.. The physical layer protocol in MANETs is responsible for bit-level transmission between network nodes and network layer is responsible to provide security services for both routing information and data message. This paper consider military scenarios and evaluate the performance of Security-enhanced-Multipath AODV (Ad hoc On-demand Distance Vector Routing) routing protocol called SNAuth-SPMAODV (Secure Neighbor Authentication Strict Priority Multipath Ad hoc On-demand Distance Vector Routing) with spread spectrum technology Direct Sequence Spread Spectrum (DSSS) to defend against signal jamming denial-of-service attacks in physical layer and network layer for MANET.The protocol discovers multiple paths between sender and receiver nodes without introducing extra packets into the network and authenticates the neighbor offering robustness in a secured MANET. SNAuth-SPMAODV with DSSS is found to be a good security solution even with its known security problems. The simulation is done using network simulator Qualnet 5.0 for different number of mobile nodes. The proposed model has shown improved results in terms of Average throughput, Average end to end delay, Average packet delivery ratio, Routing overhead and Average jitter. KeywordsMobile adhoc network,Denial of Service attack,Strict priority algorithn,Secure neighbor authentication, Direct Sequence Spread Spectrum