Modification in routing mechanism of AODV for defending blackhole and wormhole attacks

There are serious security issues in mobile ad hoc networks due to its wireless transmissions. The fact that mobile ad-hoc networks (MANET) lack fixed infrastructure and use wireless link for communication makes them very susceptible to an adversary´s malicious attacks. The paper proposes protocols which will protect ad hoc networks from blackhole and wormhole attacks and to improve network stability. This paper presents an intrusion detection system based on the concept of specification-based detection system to detect and prevent blackhole attacks. This paper also presents a hop count analysis approach to detect wormhole attacks along routes in ad hoc networks. The proposed protocol does not require any location information, time synchronization, or special hardware to detect wormhole attacks. The protocols are evaluated using analysis and simulations on network simulator.