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Open nature of peer-to-peer systems exposes them to malicious activity. Building trust relationships among peers can mitigate attacks of malicious peers. This paper presents distributed algorithms that enable a peer to reason about trustworthiness of other peers based on past interactions and recommendations. Peers create their own trust network in their proximity by using local information available and do not try to learn global trust information. Two contexts of trust, service, and recommendation contexts, are defined to measure trustworthiness in providing services and giving recommendations. Interactions and recommendations are evaluated based on importance, recentness, and peer satisfaction parameters. Additionally, recommender’s trustworthiness and confidence about a recommendation are considered while evaluating recommendations.
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ZEBROS PROJECTS
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SORT: A Self-Organizing Trust Model for Peer-to-Peer Systems
ABSTRACT
Open nature of peer-to-peer systems exposes them to malicious activity. Building
trust relationships among peers can mitigate attacks of malicious peers. This paper
presents distributed algorithms that enable a peer to reason about trustworthiness of
other peers based on past interactions and recommendations. Peers create their own
trust network in their proximity by using local information available and do not try to
learn global trust information. Two contexts of trust, service, and recommendation
contexts, are defined to measure trustworthiness in providing services and giving
recommendations. Interactions and recommendations are evaluated based on
importance, recentness, and peer satisfaction parameters. Additionally, recommender’s
trustworthiness and confidence about a recommendation are considered while
evaluating recommendations. Simulation experiments on a file sharing application
show that the proposed model can mitigate attacks on 16 different malicious behavior
models. In the experiments, good peers were able to form trust relationships in their
proximity and isolate malicious peers.
ZEBROS PROJECTS
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