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Ad Hoc Network, Malicious Node, Detection, Sybil Attacks, Sinkhole Attacks, Security.

With the popularity of intelligent electronics which rely on wireless communication in the post-PC era, computing devices have become cheaper, smaller, more mobile and more pervasive in daily lives. Construction of wireless ad hoc network becomes more and more convenient. However, the deployment of sensor nodes in an unattended environment makes the networks vulnerable to a variety of potential attacks. We present a malicious node detection mechanism. In using a monitoring mechanism to detect suspicious behavior, and on the basis of the responses from other monitoring nodes, if the number of suspicious entries concerning a particular node reaches a set threshold, that node is declared malicious. The simulation results show that the time it takes to detect a malicious node is decreased when there are more nodes in the network, and that it provides a fast and efficient way to detect malicious nodes.