关键词: 异构无线网络, 模糊集合, 信任模型, 信任度

Abstract: A dynamic trust model based on fuzzy set (DTMBF) was proposed to solve the new security challenges in heterogeneous wireless networks (HWNs). In the model, the fuzzy membership degree was used to show the subjectivity and indeterminacy of the trust. The trustworthiness evaluation incorporated direct trust, recommendation trust, reputation of recommenders and time stamp. These parameters were adjusted in time using trust feedback control mechanism. Direct and recommendation trust reflected how well the candidate network has fulfilled the service agreements in the past. Reputation of recommenders and time stamp were introduced to show the creditability and time efficiency of the trust feedback. The simulation results show the DTMBF model can accurately evaluate the trustworthiness of the network and effectively restrain the acts of slander and co-fraud.

Key words: heterogeneous wireless network, fuzzy set, trust model, trustworthiness