Signatures of Reputation ( Extended Abstract )

Signatures of Reputation: Towards Trust Without Identity

Reputation systems have become an increasingly important tool for highlighting quality information and filtering spam within online forums. However, the dependence of a user’s reputation on their history of activities seems to preclude any possibility of anonymity. We show that useful reputation information can, in fact, coexist with strong privacy guarantees. We introduce and formalize a novel...

A clustering approach to filtering unfair testimonies for reputation systems

The problem of unfair testimonies remains an open issue in reputation systems for online trading communities. A common attempt is to use binary ratings to model sellers’ reputation. However, this attempt leads to that the research of tackling unfair testimonies also focuses on reputation systems using binary ratings. In this extended abstract, we propose a two-stage clustering approach to filte...

Efficient Anonymous Fingerprinting with Group Signatures (Extended Abstract)

Reputation-based Provider Incentivisation for Provenance Provision: (Extended Abstract)

Knowledge of circumstances under which past service provisions have occurred enables clients to make more informed selection decisions regarding their future interaction partners. Service providers, however, may often be reluctant to release such circumstances due to the cost and effort required, or to protect their interests. In response, we introduce a reputation-based incentivisation framewo...

Reputation - Based Trust Management ( extended abstract )

We propose a formal model for reputation-based trust management. In contrast to conventional, credential-based trust management, in reputation-based trust management an agent’s past behavior is used to decide whether to grant him access to a protected resource. We use an event semantics inspired by the actor model, and assume that each principal has only partial knowledge of the events that hav...