关键词: 移动Ad Hoc网络, 可信路由, 无线自组网按需平面距离向量（AODV）, 灰洞攻击

Abstract: 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.

Key words: mobile Ad Hoc network, trusted routing, Ad Hoc On-Demand Distance Vector（AODV）, grayhole attack