中文摘要：

为了提高车载自组织网络中通信的安全性，VANET迫切需要有效的信任管理；针对该问题提出一种基于博弈论的信任模型，该模型引入了时间衰减函数来提高信任评价的准确性和动态适应能力，并在推荐信任计算中引入节点交易密度函数来计算推荐节点的推荐可信度；为了有效激励节点积极提供高质量的服务，惩罚不良行为节点，还引入博弈论，对节点的信任值进行博弈分析，并根据分析结果决定是否转发消息；通过仿真实验证明，该信任模型在抵御恶意节点方面有很好的效果，并且能够识别自私节点并能在信任节点之间建立信任，而且有效地隔离了自私节点。

英文摘要：

In order to improve the security of the communication in the VANET, there is an urgent need of effective trust management for vehicular ad--hoc networks. To solve this problem, a trust model based on game theory is proposed. The model introduced time attenua tion function to improve the accuracy of trust evaluation and dynamic adaptability, and the transaction frequency is used to measure the rec ommendation credibility of the recommenders in the calculation of recommendation trust. In order to effectively motivate nodes providing high quality service actively, punishing bad behavior nodes, and to introduce game theory, so as to game analysis on node trust value, and accord- ing to the analysis result to decide whether to forward the message. The simulation experiments show that the model has advantages in re straining attacks of malicious nodes and isolating selfish node, and show more adaptability, sensitivity and effectiveness.