Invited Talks -- Why We Need a Non-reductionist Approach to Trust -- Full Papers -- Dynamic Trust Federation in Grids -- Being Trusted in a Social Network: Trust as Relational Capital -- A Requirements-Driven Trust Framework for Secure Interoperation in Open Environments -- Normative Structures in Trust Management -- Gathering Experience in Trust-Based Interactions -- Multilateral Decisions for Collaborative Defense Against Unsolicited Bulk E-mail -- Generating Predictive Movie Recommendations from Trust in Social Networks -- Temporal Logic-Based Specification and Verification of Trust Models -- Modelling Trade and Trust Across Cultures -- Estimating the Relative Trustworthiness of Information Sources in Security Solution Evaluation -- Trust-Based Route Selection in Dynamic Source Routing -- Implementing Credential Networks -- Exploring Different Types of Trust Propagation -- PathTrust: A Trust-Based Reputation Service for Virtual Organization Formation -- A Versatile Approach to Combining Trust Values for Making Binary Decisions -- Jiminy: A Scalable Incentive-Based Architecture for Improving Rating Quality -- Virtual Fingerprinting as a Foundation for Reputation in Open Systems -- Towards Automated Evaluation of Trust Constraints -- Provision of Trusted Identity Management Using Trust Credentials -- Acceptance of Voting Technology: Between Confidence and Trust -- B-Trust: Bayesian Trust Framework for Pervasive Computing -- TATA: Towards Anonymous Trusted Authentication -- The Design, Generation, and Utilisation of a Semantically Rich Personalised Model of Trust -- A Trust Assignment Model Based on Alternate Actions Payoff -- Privacy, Reputation, and Trust: Some Implications for Data Protection -- A Reputation-Based System for Confidentiality Modeling in Peer-to-Peer Networks -- Robust Reputations for Peer-to-Peer Marketplaces -- From Theory to Practice: Forgiveness as a Mechanism to Repair Conflicts in CMC -- A Novel Protocol for Communicating Reputation in P2P Networks -- A Scalable Probabilistic Approach to Trust Evaluation -- Demonstration Overviews -- The Agent Reputation and Trust (ART) Testbed -- Trust Establishment in Emergency Case -- Evaluating Trust and Authenticity with Caution -- Using Jiminy for Run-Time User Classification Based on Rating Behaviour -- Traust: A Trust Negotiation Based Authorization Service -- The Interactive Cooperation Tournament -- eTVRA, a Threat, Vulnerability and Risk Assessment Tool for eEurope.

This volume constitutes the proceedings of the 4th International Conference on Trust Management, held in Pisa, Italy during 16–19 May 2006. The conference followed successful International Conferences in Crete in 2003, Oxford in 2004 and Paris in 2005. The ?rst three conferences were organized by iTrust, which was a working group funded as a thematic network by the Future and Emerging Technologies(FET) unit of the Information Society Technologies(IST) program of the European Union. The purpose of the iTrust working group was to provide a forum for cro- disciplinary investigation of the applications of trust as a means of increasing security, building con?dence and facilitating collaboration in dynamic open s- tems. The aim of the iTrust conference series is to provide a common forum, bringing together researchers from di?erent academic branches, such as the technology-oriented disciplines, law, social sciences and philosophy, in order to develop a deeper and more fundamental understanding of the issues and ch- lenges in the area of trust management in dynamic open systems. The response to this conference was excellent; from the 88 papers submitted to the conference, we selected 30 full papers for presentation. The program also included one keynote address, given by Cristiano Castelfranchi; an industrial panel; 7 technology demonstrations; and a full day of tutorials.