一种P2P分布式环境下的信任模型

A Trust Model Used in P2P Distributed Environment

针对现有的信任模型对节点行为改变的动态适应能力不足,在研究前人提出的信任模型基础上,提出了一种分布式环境下的信任模型。该模型通过综合节点之间的交易历史行为和交易评价信息,提出用局部声誉,评价信任度,全局声誉,信任度中用权重因子来概况模型,使该模型更真实化,有效化。仿真实验表明,与已有的信任模型相比,提出的模型具有更好的动态适应能力,能够有效处理动态恶意节点策略性的行为改变和不诚实反馈对系统的攻击。

Trust issue of p2p network environment is a hot in currently network of security. The peers in p2p network environment are not willing to be responsible for their historical behavior because of lack of supervisor, and it＇s not easy to be set up a trust mechanism in a traditional way to solve the problem during the transaction. So in order to solve the security issues bring by dynamics and uncertainty of p2p network environment and the trust models employed by the existing systems do not provide adequate support to coping with quick changes in peers＇ behavior. The paper proposes a trust model under one kind of distributed environment on the basis of research the trust model which previous proposed. This model proposes that the local reputation, evaluation of trust rating, global reputation, the weight factor of trust rating are used to describe the model by comprehensive the historical behavior and evaluation information between peers during the transaction. The model is more real and effective. Theoretical analysis and simulation show that the model has advantages in modeling dynamic trust relationship over the existing t rust metrics. It is highly effective in countering malicious peers regarding strategic altering behavior and dishonest feedbacks of malicious peers.