Defense Strategy for the Detection of Black Hole Attack in Dsr

Mobile Ad-hoc Networks are an emerging area of mobile computing. An ad hoc network is a collection of mobile nodes that dynamically form a temporary network and are infrastructure less. Mobile adhoc network are prone to security threats. The lack of infrastructure and dynamic structure makes them easy prey to security attacks. The security threats may vary from active impersonation attacks to passive eaves-dropping. A black hole is a malicious node that replies the route requests that it has a fresh route to destination and then it drops all the receiving packets. The damage will be serious when they work as a group. This type of attack is called cooperative black hole attack. This proposed model includes a secure routing mechanism for DSR. We use the BDSR (Baited-Black-hole DSR) to detect and avoid black hole attack and extend the concept to the detection of co-operative black hole attack. The BDSR merges the proactive and reactive defense architecture in MANET by using the virtual and non-existent destination address to bait the malicious node to reply RREP. The performance graph is simulated for the packet delivery ratio and end to end delay.