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A mobile ad-hoc network (MANET) is very receptive to security attacks due to its open medium, dynamically changing network topology, lack of centralized monitoring. These vulnerabilities are nature of MANET structure that cannot be removed. As a consequence, attacks with malicious intent have been and will be devised to exploit these vulnerabilities and to cripple MANET operations. One of the well known attack on the MANET is the Black Hole attack which is most common in the on-demand routing protocols such as AODV. This paper represents an enhanced AOMDV routing protocol for avoiding black hole attack in MANET. This routing protocol uses Ad hoc On-demand Multipath Distance Vector (AOMDV) to form link disjoint multi-path during path discovery to provide better path selection in order to avoid malicious nodes in the path using legitimacy table maintained by each node in the network.
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