Entry Details: 03/25/2005

Notes/Comments:
Credence : "Much of the content in peer-to-peer filesharing networks is corrupt, damaged, or mislabeled. Such polluted content makes it difficult for correctly functioning peers to locate desired content, decreasing the overall usefulness of the network.

Credence is a distributed object reputation management scheme that counteracts content pollution in peer-to-peer filesharing systems. Our system relies on honest peers judging the authenticity of online content, and allows clients to securely tabulate and manage object endorsements across the network. We employ a novel voter correlation scheme to weight the opinions of peers, which provides an incentive for peers to vote honestly and mitigates the impact of dishonest peers.

Credence has been implemented on top of the LimeWire client for the Gnutella network. Our client provides a peer-based judgement that a given object will possess the properties with which it is labeled and enables users to evaluate search results for authenticity before downloading.

Many peer-to-peer reputation schemes have been proposed in academia. Credence is the first practical implementation of a peer-to-peer reputation scheme. As future systems become more connected and endpoints become more reliant on content provided by other nodes, reputation systems like Credence can play an important role in assessing the validity of remote content."

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