Performance Analysis of WSN under Wormhole Attack

In mobile ad hoc networks, data transmission is performed within an untrusted wireless environment. A Wireless Networks are more vulnerable to different types of attack than wired Network. Various kinds of attack have been identified and corresponding has been proposed. Wormhole attack is one of the serious are attacks which forms a serious threat in the networks, especially get against many ad hoc wireless routing protocols and location- based wireless security system. In which traffic is forwarded and replayed from one location to another through the wormhole tunnel without compromising any cryptographic techniques over the network. Thus, it is challenging to defend against this attack. The wormhole attack is very powerful and preventing the attack has proven to be difficult. We identify two types of wormhole attacks. In first type, malicious nodes do not take part in finding routes, meaning that, other nodes in the network does not know their existence. In second type, malicious nodes do create route advertisements and other nodes are aware of the existence of malicious nodes, but they do not know that these are the malicious nodes. Many researchers have proposed detection mechanisms for the first type. Existing some solutions to detect wormhole attacks require special hardware or strict synchronized clocks or long processing time. Moreover, some solutions cannot even locate the wormhole. This paper detects the wormhole attack using neighborhood information without using extra hardware or clock synchronizations. In it AODV routing protocol is used and all the simulations are done in ns2.35 simulator.