一种基于开放式网络环境的模糊主观信任模型研究

The Research of Subjective Trust Model Based on Fuzzy Theory in Open Networks

在开放网络中,信息安全是至关重要的,而信任管理是信息安全的前提与基础.结合模糊理论在开放式网络环境下重新给出了信任的描述机制.针对主观信任的模糊性,将模糊逻辑引入主观信任研究中,对信任的传递进行了推理,提出了一种具有很强描述能力的形式化的信任推理机制.鉴于主观信任的动态性,结合模糊理论中的近似度,提出了一种新的信任更新机制,能够更有效防止恶意推荐.

Information security is essential in open networks,and trust management model is fundamental for information security.In this paper,the description of trust is given newly with fuzzy set theory in open network environment.The conceptions of linguistic variable and fuzz logic are introduced into subjective trust management for the fuzzy nature of subjective trust,and the inference to the trust transmission has been carried.A formal trust metric is given,the reasoning mechanisms of trust vectors are given,and a subjective trust management model is provided.According to the dynamic character of trust,a new model of trust renewal is provided,which is based on the degree of approximation In fuzzy theory,and which do more better in preventing the malicious recommendation.