一种角色独立的多层次信任度计算方案

Independent role based multi-leveled trust evaluation scheme

为设计细粒度的信任度计算方案,提高信任度计算结果的准确性,提出了角色独立的多层次信任度计算方案.通过将评价因子分为关键因子、主要因子和次要因子,实现细粒度的评价过程;利用评价权重的概念,对各次交互赋予权值,决定每次交互对信任度的影响;采用角色独立的策略,实现同一节点在作为申请方和提供方2种不同角色时具有不同的信任度.将这种信任度计算方法应用于搭建的P2P文件共享系统中,给出了文件共享系统评价值和评价权重的计算方法,以及交互评价与信任度计算流程.4种仿真攻击实验表明,该方法能够较好地区分恶意节点与正常交互节点,提高信任模型的抗恶意攻击能力.

In order to design a fine-grained trust evaluation scheme and improve the accuracy of trust evaluation result,an independent role-based multi-leveled trust evaluation scheme is presented in this paper.Evaluation factors are classified into key factors,main factors and subordinate factors so that fine-grained evaluation process is enabled.Evaluation weight is also introduced and impact of each interaction on trust evaluation is decided upon specified evaluation weight.Furthermore,for each node,trust as an applicant role and as a provider role are distinguished with independent role policy.Applying the proposed trust evaluation scheme to the establishment of P2P（peer to peer） file sharing system,calculation of evaluation value and evaluation weight is given,followed with a detailed description of the interaction and trust evaluation process.Simulation of four designed attacks demonstrates that the proposed scheme can effectively differentiate malicious nodes from normal ones and help trust model improve the ability of anti-malicious attacks.