Fuzzy Trust for Peer-to-Peer Based Systems

Trust management is one of the drawbacks in Peer-to-Peer (P2P) system. Lack of centralized control makes it difficult to control the behavior of the peers. Reputation system is one approach to provide trust assessment in P2P system. In this paper, we use fuzzy logic to model trust in a P2P environment. Our trust model combines first-hand (direct experience) and second-hand (reputation)information to allow peers to represent and reason with uncertainty regarding other peers' trustworthiness. Fuzzy logic can help in handling the imprecise nature and uncertainty of trust. Linguistic labels are used to enable peers assign a trust level intuitively. Our fuzzy trust model is flexible such that inference rules are used to weight first-hand and second-hand accordingly.

• Farag Azzedin
• Ahmad Ridha
• Ali Rizvi

• P2P Systems; Trust
• Reputation
• Fuzzy Logic.

[1] K. Aberer and Z. Despotovic. Managing trust in a peer-2-peer information
system. In 10th International Conference on Information and
Knowledge Management (CIKM-01), pages 310-317, Nov. 2001.
[2] R. Aringhieri, E. Damiani, S. D. Vimercati, S. Paraboschi, and P. Samarati.
Fuzzy techniques for trust and reputation management in anonymous
peer-to-peer systems. Journal of the American Society for
Information Science and Technology, 57(4):528-537, 2006.
[3] F. Azzedin, M. Maheswaran, and A. Mitra. Applying a trust brokering
system for resource matchmaking in public-resource grids. Journal of
Grid Computing, To appear., 2006.
[4] R. Dingledine, M. J. Freedman, and D. Molnar. Accountability. In
A. Oram, editor, Peer-to-Peer: Harnessing the Power of Disruptive
Technologies, pages 271-340. O-Reilly and Associates, Sebastopol, CA,
2001.
[5] I. Foster and A. Iamnitchi. On death, taxes, and the convergence of peer-to-peer and Grid computing. In 2nd International Workshop on
Peer-to-Peer Systems (IPTPS03), Feb. 2003.
[6] N. Griffiths, K.-M. Chao, and M. Younas. Fuzzy trust for peer-to-peer
systems. In P2P Data and Knowledge Sharing Workshop (P2P/DAKS
2006), page To appear, July 2006.
[7] M. Marimin, I. Hatono, and H. Tamura. Linguistic labels for expressing
fuzzy preference relations in fuzzy group decision making. IEEE Trans.
Systems, Man and Cybernetics, 28(22), 1998.
[8] A. Oram, editor. Peer-to-Peer: Harnessing the Power of Disruptive
Technologies. O-Reilly and Associates, Sebastopol, CA, 2001.
[9] S. Sen and N. Sajja. Robustness of reputation-based trust: Boolean
case. In 1st International Joint Conference on Autonomous Agents and
Multi-Agent Systems (AAMAS-02), pages 288-293, July 2002.
[10] S. Song, K. Hwang, R. Zhou, and Y. Kwok. Trusted p2p transactions
with fuzzy reputation aggregation. IEEE Internet Computing, 9(9):24-
34, 2005.