Abstract: The trust relationship is important to the security and reliability of the MANET’s routing protocol.Because of the characteristic of the MANET，it’s difficult to build the trust relationship by the traditional methods.This paper designs a trust model CETM that can measure the node’s trust relationship and presents a new security routing protocol TAODV based on it.Emulating experiment shows that when there are fewer malicious peers in the MANET，CETM is robust and effective in protecting the network from malicious behavior such as denigration，and improves the success rate of transaction markedly.Therefore，TAODV is based on the reliable node’s trust relationship.It can provide good security.

Key words: Mobile Ad Hoc Network（MANET）, secure routing, Contribution and Evaluation Trust Model（CETM）, Trusted Ad hoc On Demand Distance Vector（TAODV）

摘要： 节点间的信任关系对MANET网络路由协议的可靠性和安全性有重要意义，由于MANET网络的特性，难以通过传统的方式建立节点间信任关系。提出一个适用于MANET的信任评估模型CETM（Contribution and Evaluation Trust Model），用来度量MANET节点间信任关系，并将此模型应用于AODV协议中，提出了一种新的安全路由协议TAODV。仿真结果表明当网络中存在少于一半的恶意节点时，CETM能有效抵御如诋毁等恶意行为，从而显著地提高了交易的成功率。基于CETM的TAODV建立在可靠的节点信任关系之上，具有较好的安全性。

关键词: 移动自组网, 安全路由, 信任模型（CETM）, TAODV协议