Secured AODV to Prevent Single and Collaborative Black Hole Attack in MANETs

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. AT veryT smallT numberT ofT solutionsT existT thatT canT collectivelyT preventT bothT singleT andT collaborativeT blackT holeT attacks.T Moreover,T thoseT whoT do,T haveT highT amountT ofT overheadT andT delay.T SimulationT usingT NS-2T showsT thatT SAODVT providesT betterT securityT againstT singleT andT collaborativeT blackholeT attacksT andT alsoT betterT performanceT inT termsT ofT PacketT deliveryT ratioT andT ThroughputT againstT originalT AODVT inT presenceT ofT BlackholeT nodes.T InT comparisonT toT AODV,T thereT isT anT improvementT inT PDRT byT 60-80%T andT throughputT increasesT byT 70-80%T whenT maliciousT nodesT areT presentT inT theT network;T withT aT marginalT increaseT inT delayT andT