中文摘要：

信任评估模型对无线传感器网络的可靠运行和安全保障具有重要意义。提出了一种基于D-S证据理论的信任评估模型。模型给出了节点信任值的形式化定义；利用基本置信度函数计算直接信任值，通过邻居节点的推荐获取间接信任值；在此基础上，对直接、间接信任值进行基于权重的修正，并根据Dempster组合规则予以合成，最终得到节点综合信任值。仿真结果表明，该模型具有良好的动态适应性和容错性，能实时、准确地发现恶意节点，有效提高了无线传感器网络的安全性。

英文摘要：

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 indirect 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 adaptability and fault tolerance, but also real-time, accurate discovery of malicious nodes, so as to improve the security of wireless sensor networks effectively.