Secured AODV to prevent single and collaborative black hole attack in manets

Abstract

This paper addresses one of the most important security attacks against routing in Mobile Ad Hoc Networks – Black hole attack. We propose an algorithm called Secured AODV (SAODV) to reduce the susceptibility of AODV routing protocol against Black hole attack. The proposed algorithm combats the effect of both single and collaborative Black hole attack. Essentially it requires the intermediate node to validate the Sequence Numbers and Speed of node (which replies with a route to the destination) based on well-defined thresholds prior to instantiating a communication with destination to send data packets; without imposing any additional overhead on source and destination nodes. A very small number of solutions exist that can collectively prevent both single and collaborative black hole attacks. Moreover, those who do, have high amount of overhead and delay. Simulation using NS-2 shows that SAODV provides better security against single and collaborative blackhole attacks and also better performance in terms of Packet delivery ratio and Throughput against original AODV in presence of Blackhole nodes. In comparison to AODV, there is an improvement in PDR by 60-80% and throughput increases by 70-80% when malicious nodes are present in the network; with a marginal increase in delay and overhead.