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Dynamic trust metrics for peer-to-peer systems
Linköping University, Department of Computer and Information Science. Linköping University, The Institute of Technology.
Linköping University, Department of Computer and Information Science. Linköping University, The Institute of Technology.
Sun Microsystems Laboratories, USA.
2005 (English)In: Proceedings of the Sixteenth International Workshop on Database and Expert Systems Applications, 2005, Los Alamitos, CA, USA: IEEE Computer Society, 2005, 776-781 p.Conference paper, Published paper (Refereed)
Abstract [en]

One of the fundamental challenges for peer-to-peer (P2P) systems is the ability to manage risks involved in interacting and collaborating with priorly unknown and potentially malicious parties. Reputation-based trust management can mitigate this risk by deriving the trustworthiness of a certain peer from that peer's behavior history. However, the existing reputation systems do not provide an adequate reaction to quick changes in peers' behavior, raising serious concerns regarding their effectiveness in coping with dynamic malicious peers.

In this paper we investigate the requirements on the dynamics of trust in P2P systems and propose a versatile trust metric which satisfies these requirements. In particular, our proposed metric is able to detect and penalize both the sudden changes in peers' behavior and their potential oscillatory malicious behavior. Moreover, our metric is flexible and allows the implementation of different types of trust dynamics. We evaluate our metric through simulation and show its unique features and advantages over the existing metrics.

Place, publisher, year, edition, pages
Los Alamitos, CA, USA: IEEE Computer Society, 2005. 776-781 p.
National Category
Computer Science
Identifiers
URN: urn:nbn:se:liu:diva-30649Local ID: 16244ISBN: 0-7695-2424-9 (print)OAI: oai:DiVA.org:liu-30649DiVA: diva2:251472
Conference
Sixteenth International Workshop on Database and Expert Systems Applications, 22-26 August, 2005, Copenhagen, Denmark
Available from: 2009-10-09 Created: 2009-10-09 Last updated: 2012-12-10
In thesis
1. Security and trust mechanisms for groups in distributed services
Open this publication in new window or tab >>Security and trust mechanisms for groups in distributed services
2005 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Group communication is a fundamental paradigm in modem distributed services, with applications in domains such as content distribution, distributed games, and collaborative workspaces. Despite the increasing interest in group-based services and the latest developments in efficient and reliable multi cast, the secure management of groups remains a major challenge for group communication.

In this thesis we propose security and trust mechanisms for supporting secure management of groups within the contexts of controlled and of self-organizing settings.

Controlled groups occur in services, such as multi cast software delivery, where an authority exists that enforces a group membership policy. In this context we propose a secure group key management approach which assures that only authorized users can access protected group resources. In order to scale to large and dynamic groups, the key management scheme must also be efficient. However, security and efficiency are competing requirements. We address this issue by proposing two flexible group key management schemes which can be configured to best meet the security and efficiency requirements of applications and services. One of the schemes can also be dynamically tuned, at system runtime, to adapt to possible requirement changes.

Self-organizing groups occur in services, such as those enabled by peer-to-peer (P2P) and wireless technologies, which adopt a decentralized architecture. In the context of self-organizing groups, with no authority to dictate and control the group members' interactions, group members might behave maliciously and attempt to subvert other members in the group. We address this problem by proposing a reputation-based trust management approach that enables group members to distinguish between well-behaving and malicious members.

We have evaluated our group key management and trust mechanisms analytically and through simulation. The evaluation of the group key management schemes shows cost advantages for rekeying and key storage. The evaluation of the reputation-based trust management shows that our trust metric is resilient to group members maliciously changing their behavior and flexible in that it supports different types of trust dynamics. As a proof of concept, we have incorporated our trust mechanism into a P2P-based intrusion detection system. The test results show an increase in system resiliency to attacks.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2005. 22 p.
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 979
National Category
Computer Science
Identifiers
urn:nbn:se:liu:diva-30648 (URN)16243 (Local ID)91-85457-54-X (ISBN)16243 (Archive number)16243 (OAI)
Public defence
2005-11-09, Visionen, hus B, Campus Valla, Linköpings universitet, Linköping, 10:15 (English)
Available from: 2009-10-09 Created: 2009-10-09 Last updated: 2012-12-10Bibliographically approved

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Duma, ClaudiuShahmehri, NahidCaronni, Germano

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