Trust Model Based on D-S Evidence Theory in Wireless Sensor Networks

The existing trust model cannot solve malicious nodes in wireless sensor networks quickly and effectively, and counter-intuitive results may appear when combining evidence, so a trust model based on improved D-S evidence theory is proposed. According to Jousselme's distance, this trust model defines evidence variance to modify the evidence before combination, and then combines these evidences according to Dempster combination rule. Simulation results show that this model can find and isolate malicious nodes quickly and accurately, suppress nodes collusion and improve network performance. Compared with other existing trust models, this model has more security, robustness and accuracy.