Trust model based on risk evaluation in wireless sensor networks

Based on the fact that the existing trust models in wireless sensor networks(WSNs) do not consider the risk,which causes the attacks of malicious nodes unable to be effectively addressed,a trust model based on risk evaluation(Risk evaluation based trust model,RBTM) was adopted to solve the problem.The framework of RBTM consists of detection module,trust-computing module and decision-making module,which considers the influence of the context.Recommendation reputation and the influence of risk were considered in the calculation of the trust value,in which the calculation of the risk was realized by means of the risk evaluation function and the risk and reputation adjustment function.The results show that RBTM can resist various attacks from malicious nodes effectively and have better sensitivity than the existing trust models.It can evidently enhance successful detection ratio of malicious behavior and efficiently help nodes establish trust relationship in WSNs.