Abstract: According to the distribution network characteristics and the disadvantages of related trust model, a novel trust model considering attack spread ability in distributed network has been proposed. Based on the features of attack spread abilities, the model presents the update formula of trust, and the overall trust combines direct trust and indirect trust. Finally, the trust model’s protocol is designed and its simulation is conducted. The result shows that the simulation of the proposed model approximates the actual network operation better. It can avoid attacks from malicious nodes and improve delivery success rate. This model can also improve the accuracy of network node trust evaluation in distributed network environment. It is significant to establish the trusted network transmission path.

Key words: trust model, network security, attack spread ability, DHT

摘要： 根据分布式网络的特点及现有网络节点信任模型的不足,提出了基于攻击传播性的分布式网络信任模型。根据恶意节点攻击行为及其攻击传播性的特点,给出了在攻击具有传播性条件下的信任度更新计算方法,结合直接信任度和间接信任度计算出总体信任度,最后给出模型的计算协议及仿真实验。实验结果表明,该模型更逼近真实网络运行情况,并有效地避免恶意节点的攻击,提高文件成功传输的比率。该模型对于分布式网络环境下提高网络节点信任度评价的准确性,建立可信网络传输路径具有重要意义。

关键词: 信任模型, 网络安全, 攻击传播性, 分布式哈希表