D5.2 Behavioural Trust Management Engine

December 2009 version (v1.0) of deliverable D5.2 (Behavioural Trust Management Engine) is open to public comments, feedback and review !

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http://www.tas3.eu/project/publications/download/wp5-trust-policy-management/TAS3_D05p2_BTM_Engine_V1p0.pdf/view

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Executive Summary

One approach to build user trust in service providers is behavioural trust management (BTM). Here, users give feedback on the services they have consumed. Based on this feedback, the BTM engine dynamically computes and updates the reputation of service providers. Users can define behaviour-based trust policies which refer to these reputation values in order to identify trustworthy service providers. Besides feedback provided by end-users, the trust feedback service also gathers feedback based on auditing results.
In this deliverable, we define a trust policy language for behavioural trust management and describe the implementation of the BTM engine. Since trust is a very subjective issue, each user has individual policies on how to derive trust from feedback. Our trust policy language is flexible enough to support such subjective trust policies. Rather than using a fixed calculation schema, the BTM engine offers customizable calculation rules to combine feedback into reputation values. The reputation values in turn are used to identify trustworthy service providers. This approach enables users to define trust policies that meet their individual notion of trust.