SECURITY MECHANISM FOR DEFENDING BLACK-HOLE AND DOS ATTACKS IN MANET

COMPUTER SCIENCE ENGINEERING

There are a number of attacks are deployed on mobile ad hoc network using routing protocols among them Black-hole and DOS attack is one of the critical attack in network. In this, Black-hole attack continuously drop the packets without forwarding them to neighbour node whereas in DOS, the attacker tries to jam the network using continuous flooding of false RREQ request to the target destination. That cases the loss in performance of network i.e. congestion, frequent energy loss, low packet delivery ratio and others. Therefore solution using node characteristics are proposed which detect and prevent both the attack, in this PDR threshold is estimated. These threshold values are helps to make decision of the malicious nodes and legitimate nodes. The implementation of the proposed security technique is implemented using NS2 simulation environment and the AODV routing protocol is used to incorporate the proposed security algorithm. The experimental results are measured in conditions of end to end delay, throughput, packet delivery ratio, and energy consumption and routing overhead. The results show the proposed security algorithm improves the security and presentation of network during the malicious attack deployment.

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