3rd Joint WG Workshop - Session 2: Semantics and Trust Technologies

June 4, 2010
11:30 - 13:00
Heraklion, Crete - Greece

Chair: Carles Sierra

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PARTICIPANTS:

Slides

Abstract:

We suggest the concept of multitrust, which is aimed at computing trust by collectively involving a group of trustees at the same time: the trustor needs the concurrent support of multiple individuals to accomplish its task. We propose Soft Constraint Logic Programming based on semirings as a mean to quickly represent and evaluate trust propagation for this scenario. To attain this, we model the trust network adapting it to a weighted and-or graph, where the weight on a connector corresponds to the trust feedback value among the connected nodes. Semirings are the parametric and flexible structures used to appropriately represent trust metrics.

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Slides

Abstract:

Since the amount of user-generated content has been sharply increasing in recent years, it is essential for user to be able to represent and assess the trustworthiness of content on the Web. The notion of trust is a key ingredient for an effective manipulation of knowledge on a (world-wide) web scale. The web of trust has thus become an important research area both for web science and semantic web. In this presentation, we outline our vision on the research problem of building trust in Web content. We identify provenance as a key element to derive content trust. A trust assessment method is proposed based on the provenance information and semantics of content.

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Slides

Abstract:

We present a variant of Datalog language (we call it DatalogW) able to deal with weights on ground facts and to consequently compute a feedback result for the goal satisfaction. The weights are chosen from a proper c-semiring. In our context, our goal is to use this language as a semantic foundation for languages for expressing trust relationships. As a matter of fact, many of them have a semantics given in terms of crisp constraints: our approach is to extend them to cover also the soft case. Thus, we apply DatalogW as the basis to give a uniform semantics to declarative RTW (Trust Management) language family. The approach is rather generic and could be applied to other trust management languages based on Datalog, as a semantic sublayer to represent trust management languages where the trust level is relevant.

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Slides

Abstract:

Trust management is turning out to be essential for new ubiquitous computing paradigms ranging from agents to SOA. This survey presents methodologies that have been used so far for trust management, ranging from quantitative (Baysian statistics and Dempster Schaffer based ones), over game-theory based ones to qualitative ones (qualitative algebra or qualitative assesment dynamics). The survey presents basic principles of each methodology, its shortcomings and its advantages.

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ATTENDEES:

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