移动Ad Hoc网络中的可信路由机制研究

作为下一代网络发展趋势之一的移动Ad Hoc网络受到各种类型的安全威胁，灰洞攻击就是其中最常见的类型之一。仿真模拟了MANET环境下的灰洞攻击，即选择性丢包攻击对MANET性能的影响。从仿真模拟中可以看出灰洞攻击对于MANET的路由影响，不仅导致丢包率增加，而且会导致端到端时延方面的增加。基于信任度的定义，提出一种可信AODV路由协议（Trusted AODV Routing，TAR），方案通过交换相邻节点的节点信任度，并计算路径信任度的方法，集合最短路径算法，从而选择合适的可信路径。通过性能分析，TAR协议在丢包率、端到端时延和路径建立时延方面，相比于AODV协议有明显的提高，能够有效地抵制灰洞攻击。

Study of trusted routing mechanism in mobile Ad Hoc network

As one of the trends of next generation networks, Mobile Ad Hoc Network（MANET） suffers from various types of security threats, among of which, grayhole attack is one of the most common types. Grayhole attack is simulated（selective packet-drop attack） in mobile Ad Hoc network. From the simulation, grayhole attack makes increase in drop ratio and end-to-end delay which further makes entire network disrupted. A Trusted AODV Routing protocol（TAR） is proposed to ensure the security of MANET to prevent grayhole attack. Based on exchanging neighbor node trust value and computing path trust value, the scheme combines with the shortest path algorithm to choose the trusted routing path. From the performance analysis, TAR has significant improvement in drop ratios and end-to-end delay than AODV in presence of grayhole attacks.