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Uncertainty-Aware Computational Trust

Dorri Nogoorani, Sadegh | 2016

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 48392 (19)
  4. University: Sharif University of Technology
  5. Department: Computer Engineering
  6. Advisor(s): Jalili, Rasool
  7. Abstract:
  8. Trust is a common concept in interpersonal relationships. It is a replacement for strict control mechanisms, helping individuals to have a better estimation of the risks involved in an interaction or relationship. Computational notions of trust have a close relationship with security in computer systems.Different models of trust have been proposed to regulate interactions in: security, collaborative systems, and routing. We focused on two important problems and challenges in this dissertation: proper handling of uncertainty, and uncertainty-aware trust-based decision-making.We propose an integrated approach to modeling, processing, and treating uncertainty, as well as to uncertainty-aware decision-making in trust-based systems. The proposed approach is based on an existing base trustor which is empowered by three new risk-aware components: the trust model, the risk model, and the uncertainty manager. The trust model is responsible for transforming the trust/distrust values assessed by the base trustor, into beliefs as introduced in the Probability theory, Possibility theory, or Dempster-Shafer Mathematical Theory of Evidence. The uncertainty manager uses the risk model to aid the trustor in the management of uncertainty in its trust-based decisions. Based on our approach, we proposed a trust-driven risk-aware access control framework for Grid environments (TIRIAC). Our evaluations indicate that our proposed approach and access control framework can integrate uncertainty-awareness into a base trust-based system, while preserving its scalability and performance
  9. Keywords:
  10. Risk Management ; Possibility Theory ; Uncertainty ; Fuzzy Set Theory ; Evidences Mathematical Theory ; Access Control in Grid ; Computational Trust

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