针对现有信任评估模型中簇头选择标准单一、不同角色节点信任值难以分配与更新的问题，提出一种多角色的信任评估模型。将节点分成簇头、簇成员、网关和代理4种角色，引入节点信任值、移动性、相关度等多影响因子作为簇头、网关和代理的选择标准，采用新颖簇头节点的信任值计算方式。在簇内簇头节点的信任值由代理节点监督计算。在簇间利用由簇头、代理以及网关节点形成简化网络，根据社会网中人际关系的特点分配不同关系节点的可信度。 NS2仿真实验结果表明，该模型能有效检测出恶意节点并将其隔离，保证网络的安全性。%With the development of Mobile Ad hoc Network ( MANET ) , the study of trust evaluation in clustering structure becomes more popular nowadays. Most existing models use single criterion for head node selection,and have difficulties with assigning and updating trust value of the different roles. This paper proposes a new multi-role trust evaluation model. The node has four roles:cluster head,cluster members,gateways and agent. Thus,to compute the trust of cluster head,a new way comes out by using trust value,mobility and correlation degree of node as selecting criteria of cluster heads,gateways and agent. Inside each cluster,the trust of cluster head is computed by the agent node,for the trust between the clusters, a simplified network, which consists of cluster heads, gateways and agents, according to the characteristics of the social network relationships,assigns credit to different nodes,the agent’ s recommends is taken into calculating the trust. NS2 simulation results show that the model can effectively detect and isolate the malicious nodes, thus ensure the security of the network.
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