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Ad-hoc networks are a collection of mobile nodes that can be deployed without the need for any centralized management infrastructure. As such, the very basic operation of these networks is dependent on the cooperation of their nodes to provide communication routes. Furthermore, such networks are prone to several security risks. Consequently, when some nodes behave maliciously or in a selfish manner, the operation of the whole network can be severely affected. The behavior of such nodes can result in degradation of the performance of the network or even disruption of its operation altogether. This paper reports the results of studying the Ad-hoc network performance in the presence of malicious nodes.
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