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A Formal Framework for Concrete Reputation Systems

Krukow, K., Nielsen, M. and Sassone, V. (2005) A Formal Framework for Concrete Reputation Systems At 12th ACM Conference on Computer and Communication Security, CCS'05.. , pp. 260-269.

Record type: Conference or Workshop Item (Paper)


In a reputation-based trust-management system, agents maintain information about the past behaviour of other agents. This information is used to guide future trust-based decisions about interaction. However, while trust management is a component in security decision-making, many existing reputation-based trust-management systems provide no formal security-guarantees. In this extended abstract, we describe a mathematical framework for a class of simple reputation-based systems. In these systems, decisions about interaction are taken based on policies that are exact requirements on agents’ past histories. We present a basic declarative language, based on pure-past linear temporal logic, intended for writing simple policies. While the basic language is reasonably expressive (encoding e.g. Chinese Wall policies) we show how one can extend it with quantification and parameterized events. This allows us to encode other policies known from the literature, e.g., ‘one-out-of-k’. The problem of checking a history with respect to a policy is efficient for the basic language, and tractable for the quantified language when policies do not have too many variables.

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Published date: 2005
Venue - Dates: 12th ACM Conference on Computer and Communication Security, CCS'05., 2005-01-01
Keywords: reputation systems, trust, distributed systems, event structures, history-based access control, linear time temporal logic
Organisations: Web & Internet Science


Local EPrints ID: 262306
ISBN: 1-59593-226-7
PURE UUID: 404347be-b144-4b70-a4f4-da405c10588f

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Date deposited: 11 Apr 2006
Last modified: 18 Jul 2017 08:52

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Author: K. Krukow
Author: M. Nielsen
Author: V. Sassone

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