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
Keywords	Trust Web Services Service-Oriented Environments Reputation
Date of Defense	2008-10-24
Availability	restricted
Abstract 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.
Files	Filename       Size       Approximate Download Time (Hours:Minutes:Seconds)     28.8 Modem   56K Modem   ISDN (64 Kb)   ISDN (128 Kb)   Higher-speed Access  No file data found. indicates that a file or directory is accessible from the Virginia Tech campus network only.

If you have questions or technical problems, please Contact DLA.