Abstract. The Agent Reputation and Trust (ART) Testbed initiative has been launched with the goal of establishing a testbed for agent reputation-and trust-related technologies. The art Testbed serves in two roles: (1) as a competition forum in which researchers can compare their technologies against objective metrics, and (2) as a suite of tools with flexible parameters, allowing researchers to perform customizable, easily-repeatable experiments. In the Testbed's artwork appraisal domain, agents, who valuate paintings for clients, may purchase opinions and reputation information from other agents to produce accurate appraisals. The art Testbed features useful data collection tools for storing, downloading, and replaying game data for experimental analysis.
Reputation systems evolve as a mechanism to build trust in dynamic electronic societies. However‚ they are also a danger to privacy because they monitor a user's behavior. At the same time reputation systems offer the possibility to limit the information a user has to give away during a transaction to ensure accountablity. Privacy preserving reputation systems solve the conflict between anonymity and accountability. This paper examines privacy problems of current reputation systems and classifies them with respect to the location of stored information. Requirements for reputation systems that provide privacy protection are derived from this analysis. As result a new privacy preserving online reputation system is presented that uses locally stored coins to represent reputation information.
Abstract.Jini is an infrastructure built on top of the mobile code facilities of the Java programming language enabling clients and services to spontaneously engage in arbitrary usage scenarios. For a small home or office environment the currently available infrastructure might be adequate, but for mission-critical applications it lacks essential security properties. In the sequel we identify weak points in the Jini architecture and its protocols and propose an extension to the architecture that provides a solution to the identified security problems. We describe the design choices underlying our implementation which aims at maximum compatibility with the existing Jini specifications.
Jini is an infrastructure for spontaneous ad hoc service networks. It allows clients to find services without prior knowledge of their network surroundings. For service interaction proxy objects are used which are supplied by service providers. These proxy objects interact directly with the service provider. Compared to architectures that use a virtually central communications broker (like a CORBA ORB or an e-speak Core), this method offers a large amount of flexibility in the selection of an appropriate communication protocol. On the downside, debugging a distributed application using this approach is rather hard, as the interactions between clients and servers are not visible. This paper describes an approach using Java's dynamic proxies that allows component interaction in a Jini federation to be traced. By putting the functionality into the Jini lookup service, the approach is generic and transparent for both services and clients.
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