CERIAS - Center for Education and Research in Information Assurance and Security

Skip Navigation
CERIAS Logo
Purdue University - Discovery Park
Center for Education and Research in Information Assurance and Security

Towards Effective and Efficient Behavior-based Trust Models

Klemens Boehm - Karlsruhe University

Aug 29, 2007

PDF Slides PDF (510KB) Size: 579.3MB

Download: Video Icon MP4 Video  
Watch in your Browser   Watch on Youtube Watch on YouTube

Abstract

Trust models have been touted to facilitate cooperation among unknown entities. In our current work, we are interested in behavior-based trust models, i.e., models that derive the trustworthiness of an entity from its behavior in previous interactions. Existing proposals in this field typically feature one specific trust model. Further, various publications exist which have proposed different centrality measures to rank individuals, i.e., compute their reputation based on feedback, and have demonstrated their effectiveness in certain (rather specific) situations. This presentation in turn proposes a framework for behavior-based trust models for open environments with the following distinctive characteristic. Based on a relational representation of behavior-specific knowledge, we propose a trust-policy algebra allowing for the specification of a wide range of trust policies. Since the evaluation of the standing of an entity requires centrality indices, we propose a first-class operator of our algebra for their computation. The presentation concludes with an objective comparison of the effectiveness of the various centrality measures in reputation systems.

About the Speaker

Klemens Böhm is full professor for computer science at Universität Karlsruhe (TH). Before joining Karlsruhe University in 2004, he has been a professor at Magdeburg University. Prior to that, he has been affiliated with ETH Zurich and GMD Darmstadt. His research interests are distributed information systems, e.g., Peer-to-Peer systems and Grid infrastructures, data management in ubiquitous environments, and data warehousing. Klemens puts much effort in interdisciplinary research and application-oriented projects, currently ranging from biosys-tematics to traffic-data management.

Unless otherwise noted, the security seminar is held on Wednesdays at 4:30P.M. STEW G52, West Lafayette Campus. More information...

Disclaimer

The views, opinions and assumptions expressed in these videos are those of the presenter and do not necessarily reflect the official policy or position of CERIAS or Purdue University. All content included in these videos, are the property of Purdue University, the presenter and/or the presenter’s organization, and protected by U.S. and international copyright laws. The collection, arrangement and assembly of all content in these videos and on the hosting website exclusive property of Purdue University. You may not copy, reproduce, distribute, publish, display, perform, modify, create derivative works, transmit, or in any other way exploit any part of copyrighted material without permission from CERIAS, Purdue University.