AODV-based secure routing against blackhole attack in MANET

Utilization of mobile devices are burgeoning rapidly and consequently mobile ad-hoc networks (MANETs). The self configuring and infrastructure less property of MANETs makes them easily deployable anywhere and extremely dynamic in nature. Lack of centralized administration and coordinator are the reasons for MANET to be vulnerable to active attack like black hole. Black hole attack is ubiquitous in mobile ad hoc as well as wireless sensor networks. Black hole affected node, without knowing actual route to destination, spuriously replies to have shortest route to destination and entice the traffic towards itself to drop it. Network containing such node may not work according to the protocol being used for routing. Commonly used protocols like ADOV, DSR, and so forth in MANET are not designed to tackle black hole attack or black hole affected routes. Hence this paper proposes an AODV-based secure routing mechanism to detect and eliminate black hole attack and affected routes in the early phase of route discovery. A validity value is attached with RREP which ensures that there is no attack along the path. The proposed method is simulated in NS2 and performance analysis is carried out.