Cryptology ePrint Archive: Report 2009/442

Fuzzy Privacy Preserving Peer-to-Peer Reputation Management

Rishab Nithyanand and Karthik Raman

Abstract: The P2PRep algorithm is a reputation-management mechanism in which a peer uses fuzzy techniques to compute local reputations and aggregates these results to compute a global reputation for another peer which has made an offer of service. While this mechanism is known to be extremely effective in the presence of malicious peers, it has one drawback: it does not preserve the anonymity of peers in the network during the voting phase of protocol. This makes it unsuitable for use in networks which associate peers with a routing identifier such as an IP address. We propose in this paper, a solution to this problem - the 3PRep (Privacy Preserving P2PRep) algorithm which implements two protocols to maintain vote privacy in P2PRep without significant additional computation and communications overhead. In doing so, we also provide a method to compute the Ordered Weighted Average (OWA) over distributed datasets while maintaining privacy of these data.

Category / Keywords: Voting, P2P, OWA, Trust and Reputation

Date: received 8 Sep 2009, last revised 21 Sep 2009

Contact author: rishabn at uci edu

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Version: 20090922:012341 (All versions of this report)

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