Security agents for detecting and avoiding cooperative blackhole attacks in MANET

During blackhole attack, a malicious node captures packets and not forwards them in the network and advertises itself as having the shortest path to the node whose packets it wants to intercept. If more than one malicious nodes work together as a group then the damage will be very serious. This type of attack is called cooperative black hole attack. To avoid single blackhole attack in MANET we considered a mechanism that uses FurtherRouteRequest packets. For detecting and avoiding cooperative blackhole attack we propose a new technique which uses Cooperative Cluster Agents. In the proposed approach we pass DRI and SRT-RRT table as an input to Cooperative Security Agents. Based on these inputs the CSAs use cross checking and detection flow mechanisms for detecting cooperative blackhole attack, once it is detected that can be avoided by passing alert notification in the MANET. For implementation of the proposed scheme we will use network simulator — ns-2.35. We evaluate the proposed solution and compare it with standard AODV protocol in terms of throughput, packet delivery ratio and end-to-end delay.