Biblio

The MANET that is Mobile Ad hoc Network are forming a group of many nodes. They can interact with each other in limited area. All the Malicious nodes present in the MANET always disturb the usual performance of routing and that cause the degradation of dynamic performance of the network. Nodes which are malicious continuously try to stump the neighbor nodes during the process of routing as all neighbor nodes in the network merely forward the reply and response of neighboring. The intermediate nodes work is very responsible in routing procedure with continuous movement. During the work we have recommended one security scheme against the attack of packet dropping by malicious node in the network. The scheme which is recommended here will work to find attacker by using the concept of detection of link to forward the data or information between sender and receiver. The packet dropping on link, through node is detected and prevented by IDS security system. The scheme not only works to identify the nodes performing malicious activity however prevent them also. The identification of attacker is noticed by dropping of data packets in excsssessive quantity. The prevention of it can be done via choosing the alternate route somewhere the attacker performing malicious activity not available among the senders to receivers. The neighbor nodes or intermediary identify the malicious activity performer by the way of reply of malicious nodes which is confirmed. The recommended IDS system secures the network and also increases the performance after blocking malicious nodes that perform malicious activity in the network. The network performance measures in the presence of attack and secure IDS with the help of performance metrics like PDR, throughput etc. Planned secure routing improves data receiving and minimizes dropping data in network.

Rapid advances in wireless ad hoc networks lead to increase their applications in real life. Since wireless ad hoc networks have no centralized infrastructure and management, they are vulnerable to several security threats. Malicious packet dropping is a serious attack against these networks. In this attack, an adversary node tries to drop all or partial received packets instead of forwarding them to the next hop through the path. A dangerous type of this attack is called black hole. In this attack, after absorbing network traffic by the malicious node, it drops all received packets to form a denial of service (DOS) attack. In this paper, a dynamic trust model to defend network against this attack is proposed. In this approach, a node trusts all immediate neighbors initially. Getting feedback from neighbors' behaviors, a node updates the corresponding trust value. The simulation results by NS-2 show that the attack is detected successfully with low false positive probability.