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2007

Ensuring Content Integrity for Untrusted Peer-to-Peer Content Distribution Networks

10 years 1 months ago
Ensuring Content Integrity for Untrusted Peer-to-Peer Content Distribution Networks
Many existing peer-to-peer content distribution networks (CDNs) such as Na Kika, CoralCDN, and CoDeeN are deployed on PlanetLab, a relatively trusted environment. But scaling them beyond this trusted boundary requires protecting against content corruption by untrusted replicas. This paper presents Repeat and Compare, a system for ensuring content integrity in untrusted peer-to-peer CDNs even when replicas dynamically generate content. Repeat and Compare detects misbehaving replicas through attestation records and sampled repeated execution. Attestation records, which are included in responses, cryptographically bind replicas to their code, inputs, and dynamically generated output. Clients then forward a fraction of these records to randomly selected replicas acting as verifiers. Verifiers, in turn, reliably identify misbehaving replicas by locally repeating response generation and comparing their results with the attestation records. We have implemented our system on top of Na Kika....
Nikolaos Michalakis, Robert Soulé, Robert G
Added 02 Oct 2010
Updated 02 Oct 2010
Type Conference
Year 2007
Where NSDI
Authors Nikolaos Michalakis, Robert Soulé, Robert Grimm
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