Trust evaluation model based on D-S evidence theory in wireless sensor networks

Trust evaluation model plays a significant role in reliability and security of wireless sensor net-works. A trust evaluation model based on D-S evidence theory was proposed. Giving the formal definition of node's trust from the model,direct trust was calculated with basic probability assignment function and indi-rect trusts were obtained from neighbor nodes' recommendations. On this basis, the direct trust and indirect trusts were combined according to Dempster combination rule after being amended with weight,to obtain node's comprehensive trust finally. Simulation results show that the model has not only good dynamic a-daptability and fault tolerance, but also real-time, accurate discovery of malicious nodes, so as to improve the security of wireless sensor networks effectively.