Peer-to-peer (P2P) systems are predominantly used to
\ndistribute trust, increase availability and improve performance.
\nA number of content-sharing P2P systems, for
\nfile-sharing applications (e.g., BitTorrent and Storj) and
\nmore recent peer-assisted CDNs (e.g., Akamai Netsession),
\nare finding wide deployment. A major security
\nconcern with content-sharing P2P systems is the risk of
\nlong-term traffic analysis\u2014a widely accepted challenge
\nwith few known solutions.
\nIn this paper, we propose a new approach to protecting
\nagainst persistent, global traffic analysis in P2P content sharing
\nsystems. Our approach advocates for hiding
\ndata access patterns, making P2P systems oblivious. We
\npropose OBLIVP2P\u2014 a construction for a scalable distributed
\nORAM protocol, usable in a real P2P setting.
\nOur protocol achieves the following results. First, we
\nshow that our construction retains the (linear) scalability
\nof the original P2P network w.r.t the number of peers.
\nSecond, our experiments simulating about 16,384 peers
\non 15 Deterlab nodes can process up to 7 requests of
\n512KB each per second, suggesting usability in moderately
\nlatency-sensitive applications as-is. The bottlenecks
\nremaining are purely computational (not bandwidth).
\nThird, our experiments confirm that in our construction,
\nno centralized infrastructure is a bottleneck \u2014
\nessentially, ensuring that the network and computational
\noverheads can be completely offloaded to the P2P network.
\nFinally, our construction is highly parallelizable,
\nwhich implies that remaining computational bottlenecks
\ncan be drastically reduced if OBLIVP2P is deployed on
\na network with many real machines.<\/p>\n","protected":false},"excerpt":{"rendered":"
Peer-to-peer (P2P) systems are predominantly used to distribute trust, increase availability and improve performance. A number of content-sharing P2P systems, for file-sharing applications (e.g., BitTorrent and Storj) and more recent peer-assisted CDNs (e.g., Akamai Netsession), are finding wide deployment. A major security concern with content-sharing P2P systems is the risk of long-term traffic analysis\u2014a widely 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