An approach to evaluation of arguments in trust cases

Łukasz Cyra; Janusz Górski

doi:10.1109/depcos-relcomex.2008.39

An approach to evaluation of arguments in trust cases

Abstract

Trustworthiness of IT systems can be justified using the concept of a trust case. A trust case is an argument structure which encompasses justification and evidence supporting claimed properties of a system. It represents explicitly an expert's way of assessing that a certain object has certain properties. Trust cases can be developed collaboratively on the basis of evidence and justification of varying quality. They can be complex structures impossible to comprehend fully by a non-expert. A postulated model of communicating trust case contents to an 'ordinary' user is an expert acting on user's behalf and communicating his/her assessment to the user. Therefore, a mechanism for issuing and aggregating experts' assessments is required. The paper proposes such a mechanism which enables assessors to appraise strength of arguments included in a trust case. The mechanism uses Dempster Shafer's model of beliefs to deal with uncertainty resulting from the lack of knowledge of the expert. Different types of argumentation strategies were identified and for each of them appropriate combination rules were presented.

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Category:: Conference activity
Type:: publikacja w wydawnictwie zbiorowym recenzowanym (także w materiałach konferencyjnych)
Title of issue:: DepCoS - RELCOMEX'08 : Dependability of Computer Systems : proceedings of International Conference on Dependability of Computer Systems, Szklarska Poręba, Poland, 26-28 June 2008 strony 103 - 110
Language:: English
Publication year:: 2008
Bibliographic description:: Cyra Ł., Górski J.: An approach to evaluation of arguments in trust cases// DepCoS - RELCOMEX'08 : Dependability of Computer Systems : proceedings of International Conference on Dependability of Computer Systems, Szklarska Poręba, Poland, 26-28 June 2008/ ed. eds: W. Zamojski [et al] Los Alamitos, California: IEEE Computer Society ; CPS, 2008, s.103-110
DOI:: Digital Object Identifier (open in new tab) 10.1109/depcos-relcomex.2008.39
Verified by:: Gdańsk University of Technology