地理位置路由中基于信任的安全模型

针对无线传感器网络中地理位置路由易于受到的虚假路由信息、选择性转发、女巫等多重安全威胁,提出一种基于信任的多重攻击防御安全模型.考虑传感器节点资源受限的特性,通过一定时间内数据报的确认信息代替耗能的监听机制,使用Dirichlet分布函数计算路径上邻居节点的可靠性,并结合地理位置路由中的代价作出路由选择.同时,初始信任被动态决定,按照信任值划分服务等级以限制恶意节点的请求.仿真结果及分析表明,在多重攻击下该模型比已有模型在成功转发率、网络生命周期方面有较大的提高.

A Trust Based Secure Model for Geographical Routing

Geographical routing in wireless sensor networks is vulnerable to multiple security threats such as false routing information, selective forwarding and the Sybil. A trust based secure model is put forward for defending against above-mentioned attacks. For the nature of sensor nodes' resource constraint, trust values of neighboring nodes on the routing path can be calculated by Dirichlet distribution, which is based on data packets' acknowledges in a certain period instead of the energy-consuming monitoring. Trust is determined by combining the cost of geographic routing with energy aware routing for selecting the next hop of routing. Meanwhile, the initial trust is dynamically determined. In accordance with the trust value, service levels are divided to restrict malicious nodes' requirements. Simulation results and analysis show that, under multiple attacks, the proposed model has advantages in successful delivery ratio and network lifetime over the existing models.