一种基于不同角色和反馈可信度的P2P信誉模型

针对已有的全局信誉模型，多数方案仅单独使用正面或负面否认信息构建实体的信誉值，且基本建立在信任度高的节点反馈也更可信的假设上，将节点的反馈质量等同于服务质量的问题，提出一种基于节点不同角色和反馈可信度的P2P全局信誉模型，并给出了模型的数学表述和实现方法。分析与仿真实验结果表明，该模型较已有的全局模型能有效防止恶意节点用诚信买掩盖恶意卖以及共谋欺骗等恶意行为，促进节点积极诚信参与网络活动，提高系统的安全性。

A P2P reputation model based on different role and feedback credibility

The previous work about the global reputation model was mostly based on only positive or negative information, and based on the assumption that the peer with higher trust value feedback more credible. In order to solve the problems, this paper proposed a global reputation model based on peers different role and feedback credibility(DRFCrep), and gave the mathematic analyses and implementation method. Theoretical analyses and simulation experiments showed that the model had advantages in combating various malicious deals such as concealing the bad sale with good buy and cooperative deceit, Compared with the current global trust model, and it can promote peers to share their resources and enhance security performance of the p2p networks.