移动Ad Hoc网络中一种安全的AODV路由协议及性能优化

摘要

A novel secure AODV based on trust mechanism (SAODV-TM) was proposed in this paper. In SAODV-TM protocol, a security enhancement technology is designed based on trust mechanism, which employs global trust mechanism and local trust mechanism to compute the node trust degree, and the packet only be allowed to forwarded to the trust node. To improve protocol performance furthermore, based on ant colony algorithm, this paper improves SAODV-TM protocol (ACA-SAODV-TM), which adds positive pheromone in the node if the node is trust. ACA-SAODV-TM uses a novel routing packet called ant agent routing packet (AARP), and check the pheromone value saved in the routing table of the node and the shortest path to realize the routing optimization. Finally, this paper uses OPNET to compare ACA-SAODV-TM with SAODV-TM, AODV under DoS attack in terms of performance. The result shows that ACA-SAODV-TM outperforms other protocols in terms of packet delivery rate and network throughput significantly according to ACA.%基于移动Ad Hoc网络中传统的AODV路由协议,文章提出了一种新的AODV安全路由协议(SAODV-TM).在SAODV-TM协议中,文章设计了基于信任机制的安全增强技术,根据节点行为信息,分别使用全局信任机制和本地信任机制计算节点信任度,数据分组仅被允许发送至信任节点.为进一步提高协议性能,结合蚁群算法,文章对SAODV-TM协议进行改进.改进后的协议(ACA-SAODV-TM协议)将蚁群信息素加入到受信任节点中,设计了一种蚂蚁代理路由分组,通过查找存于节点路由表中的信息素数据和最短路径实现路由寻优.最后使用网络仿真软件OPNET综合比较了ACA-SAODV-TM、SAODV-TM、AODV等算法的协议性能,结果表明使用SAODV-TM协议和ACA-SAODV-TM协议能够进一步提升移动Ad Hoc网络的分组传输成功率和网络吞吐量性能.