关键词: 移动Ad Hoc网, 可信度, 信任评估, 贝叶斯方法, Beta分布

Abstract: In the mobile Ad Hoc network, there is no infrastructure, so that the trust evaluation is more and more significant. In the existing model of trust evaluation, there are some defects on evidence collection and integration. A trust evaluation model of multidimensional evidence fusion is proposed. It detects the various historical behavior of nodes through the expanding Watchdog to widen the dimension of direct evidence collecting. Each behavior is calculated by using Bayesian method which meets the Beta distribution. Through the credibility method, all behaviors are merged together to improve the accuracy of assessment of the trust. The simulation results demonstrate the effectiveness of this model. Analysis shows that recommended weight is quantitatively evaluated by information similarity measure, reducing the impact of malicious recommendation, ensuring the trust assessment robustness.

Key words: mobile Ad Hoc networks, credibility, trust evaluation, Bayesian method, Beta distribution