Title page for ETD etd-11112008-115537

Type of Document Dissertation
Author Malik, Zaki
Author's Email Address zaki@vt.edu
URN etd-11112008-115537
Title Reputation-based Trust Framework for Service Oriented Environments
Degree PhD
Department Computer Science
Advisory Committee
Advisor Name Title
Gracanin, Denis Committee Chair
Bouguettaya, Athman Committee Co-Chair
Barkhi, Reza Committee Member
Bohner, Shawn A. Committee Member
Lu, Chang-Tien Committee Member
  • Trust
  • Web Services
  • Service-Oriented Environments
  • Reputation
Date of Defense 2008-10-24
Availability restricted
We investigate the problem of establishing trust in service-oriented environments. We focus

on providing a reputation framework that would enable trust-based interactions with and

amongst Web services. We define methods for the creation of reputation information, its

collection, and assessment that are robust in the face of a variety of attacks. Our framework

(denoted RATEWeb) supports a cooperative model in which Web services share their experiences of the service providers with their peers through feedback ratings. The different ratings are aggregated to derive a service provider’s reputation. This in turn is used to evaluate trust. For situations where rater feedbacks are scarce, we use statistical forecasting (particularly, a Hidden Markov Model) to ascertain trust. The approaches and techniques

developed under the RATEWeb framework facilitate the optimal selection and/or composition of Web services based on service reputations. We conduct an extensive performance study (analytical and experimental) to assess the fairness and accuracy of the proposed techniques.

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