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Wireless sensor networks (WSNs) is drawing a lot of attention as a method for realizing a ubiquitous society, which needs more than one sensor to accomplish the task together. Malicious nodes are well disguised in a hostile military environment, so they can attack the whole network using the natural cooperations of WSNs. Therefore, how to choose one or more suitable sensor nodes to cooperate in a hostile environment and guarantee better system performance in the meantime is a difficult problem. To overcome this, we study trust mechanism in the human society and introduce it into a WSN. We also construct a trust model in accordance with the characteristics of a WSN. Based on trust model, we propose a novel sensor node selection algorithm. The simulation results show that our algorithm can improve the system stability of sensor networks, and efficiently defend against the attacks of malicious nodes and also prolong the lifetime of sensor networks.
Date of Conference: 21-25 Sept. 2007