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Modeling Dynamic Trust and Risk Evaluation Based on High-Order Moments

机译：基于高阶矩的动态信任与风险评估模型

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摘要

This paper proposes a dynamic trust and risk evaluation model based on high-order moments. The credibility of an entity is measured with trust degree and risk value comprehensively. Firstly, considering the dynamic and time decay characters of trust, a time attenuation function is defined, and direct trust is further expressed. Subsequently, in order to improve the accuracy of feedback trust, a filter mechanism is constructed to eliminate the false feedback, combining coefficient of skewness with hypothesis test. More importantly, the weights of direct trust and feedback trust are derived subjectively and adaptively with the moments and frequency of direct interactions. Furthermore, risk is evaluated with direct risk and feedback risk, which are obtained by mainly using coefficient of variation and coefficient of kurtosis. Risk value can be used to measure the stability of providing services. Simulation results show that the proposed model not only has high accuracy, but also resists effectively collusive attacks and strategic malicious behaviors.
机译：本文提出了一种基于高阶矩的动态信任与风险评估模型。实体的信誉度通过信任度和风险值进行全面衡量。首先，考虑信任的动态和时间衰减特性，定义了时间衰减函数，并进一步表达了直接信任。随后，为了提高反馈信任的准确性，构造了一种过滤机制来消除错误反馈，将偏度系数与假设检验相结合。更重要的是，直接信任和反馈信任的权重是由主观和适应性随直接交互的时刻和频率而得出的。此外，通过直接风险和反馈风险来评估风险，直接风险和反馈风险主要通过使用变异系数和峰度系数获得。风险值可用于衡量提供服务的稳定性。仿真结果表明，所提出的模型不仅具有较高的精度，而且能够有效地抵抗串通攻击和战略性恶意行为。

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  • 来源
    《Mathematical Problems in Engineering》 |2015年第2期|789820.1-789820.9|共9页
  • 作者

    Gao Yan; Dai Zhiyong; Liu Wenfen;

  • 作者单位

    State Key Lab Math Engn & Adv Comp, Zhengzhou 450001, Peoples R China.;

    State Key Lab Math Engn & Adv Comp, Zhengzhou 450001, Peoples R China.;

    State Key Lab Math Engn & Adv Comp, Zhengzhou 450001, Peoples R China.;

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