关键词: 无线传感器网络, 信任云, 信任模型, 相似度, 恶意攻击

Abstract: Cloud-based trust model in wireless sensor networks does not take account of the timeliness of trust relationship between nodes, and the trust combination which adoptes the method of direct averaging is not in accordance with peoples intuitive judgments. Aiming to solve these problems, a new trust evaluation model for wireless sensor networks based on trust-cloud was proposed. This model distributed the weights of the recent trust-cloud and the historical trust-cloud according to the recent behavior of nodes, and amended the weights of the direct trust-cloud and the recommended trust-cloud using the similarity degree respectively. The simulation results indicate that this model is superior to the original one: it can not only resist attacks of malicious nodes, but also identify malicious nodes accurately in real time.

Key words: Wireless Sensor Network (WSN), trust-cloud, trust model, similarity degree, malicious attack