P2P环境中基于信誉与云理论的信任模型

在P2P环境中，现有信任模型不能完整地体现信任的主观性、模糊性和随机性。为此，提出一种针对P2P环境的信任模型 (CloudBT)。在计算节点的全局信任值时引入时间权重函数，并结合云模型得到节点的信任值，该信任值包括信任的平均度量和信任的不确定信息。在做信任决策时，综合考虑节点信任值的大小及其行为的波动情况。模拟结果表明，CloudBT在P2P电子商务环境中具有较高的成功交易率和较强的抗攻击能力。

Trust Model Based on Reputation and Cloud Theory in P2P Environment

In P2P environment,most of the existing trust models can not reflect the subjectivity,fuzziness and uncertainty of trust.This paper presents a new trust model for P2P environment——CloudBT.In the calculation of the node global trust value,it introduces time weight function,and combines with cloud model to get the node trust value which integrates cloud model with reputation-based model to describe the measure and uncertainty of trust,and considers both the trust value of nodes and behavior of the fluctuations when making trust decisions.Simulation results show that the CloudBT model has the high success rate of trade and strong ability against the attack in P2P e-commerce environment.