NDLI: An ontology of trust: formal semantics and transitivity

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An ontology of trust: formal semantics and transitivity

Content Provider	ACM Digital Library
Author	Fox, Mark S. Huang, Jingwei
Abstract	This paper formalizes the semantics of trust and studies the transitivity of trust. On the Web, people and software agents have to interact with "strangers". This makes trust a crucial factor on the Web. Basically trust is established in interaction between two entities and any one entity only has a finite number of direct trust relationships. However, activities on the Web require entities to interact with other unfamiliar or unknown entities. As a promising remedy to this problem, social networks-based trust, in which A trusts B, B trusts C, so A indirectly trusts C, is receiving considerable attention. A necessary condition for trust propagation in social networks is that trust needs to be transitive. However, is trust transitive? What types of trust are transitive and why? There are no theories and models found so far to answer these questions in a formal manner. Most models either directly assume trust transitive or do not give a formal discussion of why trust is transitive. To fill this gap, this paper constructs a logical theory of trust in the form of ontology that gives formal and explicit specification for the semantics of trust. Based on this formal semantics, two types of trust -- trust in belief and trust in performance are identified, the transitivity of trust in belief is formally proved, and the conditions for trust propagation are derived. These results give theoretical evidence to support making trust judgment using social networks on the Web.
Starting Page	259
Ending Page	270
Page Count	12
File Format	PDF
ISBN	1595933921
DOI	10.1145/1151454.1151499
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2006-08-13
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Trust formalization Trust ontology Web of trust Transitivity of trust
Content Type	Text
Resource Type	Article

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