Impact of Gray hole attack on adhoc networks

Mobile adhoc networks are self-configuring network connected by wireless links which forms a random topology of mobile nodes. Topology of these network changes rapidly and unpredictably. Due to lack of infrastructure support each node acts as a router and any nodes can join and leave the network at any time. Providing security to these networks is a challenging issue because these type of networks suffer for various kinds of malicious attacks. One of the attacks which are more difficult to detect in the Mobile adhoc network is Gray hole attack. In this paper first an analytical approach to detect Gray Hole attack is developing for AODV protocol. Second, a simple algorithmatical framework is created for generating attacks. Third, experiments are simulated for Gray Hole attacks under variety of adhoc network conditions such as packet delivery ratio, dropped packets. Overhead, normalized routing load in order to understand the severity of this attack.