Secure AODV protocol to mitigate Black hole attack in Mobile Ad hoc

Mobile Ad hoc Networks are self maintainable, dynamic and temporary networks. But they are vulnerable to various security attacks. Black hole attack is one of them. Black hole attacker attacks reactive routing protocols and disrupt routing services leading to drop in packet delivery percentage. Ad hoc On-demand Distance Vector routing (AODV) is a widely adopted network routing protocol for Mobile Ad hoc Network (MANET). To mitigate black hole attack, we propose modifications to the AODV protocol and justify the solution with appropriate implementation and simulation using NS-2.34. The proposed protocol makes use of the number of Route request and Route replies forwarded by the nodes to detect the attack. Our analysis show that modified protocol improves packet delivery ratio even in presence of attack.