基于等级评价的VANET信任模型

Trust Model based on Graded Evaluation in VANET

信任管理成为车载自组织网络(VANET)应用的重要问题。针对该问题提出一种基于角色和事件信任等级评价的信任模型,结合以往方法的直接信任和邻居节点推荐信任的基础上,引入节点角色和事件等级并分配相应权重,综合判定信息是否可信。信任值计算采用角色信任等级评价的方法,受评价节点信任等级的影响,在一定程度上降低恶意节点共谋攻击,恶意评价。仿真后证明,该方法在安全性能、过滤恶意节点、降低系统开销等几个方面有较好表现,进一步加强了VANET网络环境中对恶意节点和恶意信息的识别和过滤,更有效地进行信息传递。

Trust management gradually becomes an urgent problem in the applications of VANET.This paper proposes a new trust model based on graded evaluation of the event and role,and in combination of the traditional direct trust with recommend trust,the concept of graded event and node role is introduced in VANET,including the corresponding assigned weight,and thus the comprehensive evaluation of trust value could be done.Due to the influence of the event and node trust grade,the evaluation of conspiracy attack and malicious evolution by misbehaved nodes might be reduced in some degree.The simulation result shows that the proposed model has a good performance in security,filtering of the misbehaved nodes reduction of the system cost and so on,thus further strengthening the recognization and filtering of malicious information and misbehaved nodes,and realizing the effective propagation of information.