Enahancing Security in Manet

The ultimate goal of research on enhance Security in Manet is to apply reputation mechanism to DSR and evaluate its performance. In this work we also considering the malicious nodes, those are not only silently dropping the packet, but also attacking the routing layer. We are dealing with more aggressive routing level attack, in which a black hole actively replying the route discovery requests advertise itself as attractive route having shortest number of hops to destination and higher DSR sequence number. Continuously monitors the behavior of nodes by checking their reputation value. If the reputation value is 1 then it is measured as best Behaviour of node or if the reputation value is 0 then it is measured as worst behavior. P node observes the other neighbouring nodes either they send or receive the packets or not. P node send the data directly to Q node or via the any neighbouring node by checking their reputation value. P demand the reputation value of Q from the neighbouring nodes while sending data to Q. The main objective of thesis is to provide a solution on the basis of reputation method to solve routing issues raised by misbehaving nodes and because selfish node for saving its resources (e.g. battery power and bandwidth) does not cooperate and drops packets which are not belonging to it. If there is no mechanism to cope with selfish nodes, Cooperative nodes will be overloaded, hence network performance will degrade. So here author improved the performance of network by applying the reputation scheme. Simulation tool NS 2.35 and Ubuntu 11 is used to study the performance. NS 2.35 is an event driven network simulator program, developed at the University of California Berkley, which includes many network objects such as protocols, applications and traffic source behavior. At the simulation layer NS uses OTcl (Object oriented Tool Command Language) programming language to interpret user simulation scripts. OTcl language is in fact an object oriented extension of the Tcl Language. The Tcl language is fully compatible with the C++ programming language.