Secure route discovery in AODV in presence of blackhole attack

In recent years, there has been tremendous increase in mobile adhoc networks applications ranging from military and rescue operations to collaborative and distributed computing, therefore secure data transmission has become one of the critical issue in MANET. A mobile adhoc network is genrally established without relying on centralized and dedicated servers. Attackers exploit the loopholes of route discovery process to carry out their malicious intent as it is an inevitable process in reactive protocols. Blackhole is one such popular attack that sends forged routing information to fool source node and drops all the data packets after introducing itself in the route between source node to destination. In this paper, damage caused to AODV in presence of blackhole node has been evaluated and solution to defend against blackhole attack has been proposed and simulated on Ns-2 to prove its efficiency and reliability. The packet processing technique of normal AODV is enhanced to detect routing misbehavior and alert other nodes using default AODV control message, HELLO messages to reduce additional overhead.