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Secure Decentralized Swarm Discovery in Tribler

Secure Decentralized Swarm Discovery in Tribler. Jelle Roozenburg. M.Sc. thesis presentation 17th November 2006 Parallel and Distributed Systems Group. Contents. Peer-to-peer File Sharing Swarm Discovery Little Bird Protocol Evaluation Conclusions and Recommendations.

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Secure Decentralized Swarm Discovery in Tribler

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  1. Secure Decentralized Swarm Discovery in Tribler Jelle Roozenburg M.Sc. thesis presentation 17th November 2006 Parallel and Distributed Systems Group

  2. Contents • Peer-to-peer File Sharing • Swarm Discovery • Little Bird Protocol • Evaluation • Conclusions and Recommendations

  3. 1. Peer-to-peer File Sharing Peer-to-peer | Swarm discovery | Little bird protocol | Evaluation | Conclusions

  4. Peer-to-peer File Sharing Peer-to-peer | Swarm discovery | Little bird protocol | Evaluation | Conclusions

  5. Client-Server Peer-to-peer | Swarm discovery | Little bird protocol | Evaluation | Conclusions

  6. Client-Server Peer-to-peer | Swarm discovery | Little bird protocol | Evaluation | Conclusions

  7. Client-Server • Not scalable • Not reliable Peer-to-peer | Swarm discovery | Little bird protocol | Evaluation | Conclusions

  8. Peer-to-peer Peer-to-peer | Swarm discovery | Little bird protocol | Evaluation | Conclusions

  9. BitTorrent Peer-to-peer | Swarm discovery | Little bird protocol | Evaluation | Conclusions

  10. BitTorrent Peer-to-peer | Swarm discovery | Little bird protocol | Evaluation | Conclusions

  11. BitTorrent Peer-to-peer | Swarm discovery | Little bird protocol | Evaluation | Conclusions

  12. BitTorrent Peer-to-peer | Swarm discovery | Little bird protocol | Evaluation | Conclusions

  13. BitTorrent Peer-to-peer | Swarm discovery | Little bird protocol | Evaluation | Conclusions

  14. BitTorrent Peer-to-peer | Swarm discovery | Little bird protocol | Evaluation | Conclusions

  15. BitTorrent • Scalable • Reliable Peer-to-peer | Swarm discovery | Little bird protocol | Evaluation | Conclusions

  16. Tribler: Social-based BitTorrent • Social network • Streaming media Peer-to-peer | Swarm discovery | Little bird protocol | Evaluation | Conclusions

  17. Wouter’s favorites Jan-Peter’s favorites Mozart.mp3 Mozart.mp3 Zwartboek.avi Beethoven.mp3 Simpsons.avi Bach.mp3 BuddyCast Recommendation • Exchange preference lists • Recommend Beethoven.mp3 to Jan-Peter • Used later in my protocol Similar taste Peer-to-peer | Swarm discovery | Little bird protocol | Evaluation | Conclusions

  18. 2. Swarm Discovery Peer-to-peer | Swarm discovery | Little bird protocol | Evaluation | Conclusions

  19. Mozart.mp3 BitTorrent Swarm Swarm Peer-to-peer | Swarm discovery | Little bird protocol | Evaluation | Conclusions

  20. Mozart.mp3 Zwartboek.avi Simpsons.avi Bach.mp3 Beethoven.mp3 BitTorrent Swarm Peer-to-peer | Swarm discovery | Little bird protocol | Evaluation | Conclusions

  21. Swarm Discovery How to find the peers in a particular swarm? ? Peer-to-peer | Swarm discovery | Little bird protocol | Evaluation | Conclusions

  22. Swarm Discovery Without swarm discovery, no download ! ? Peer-to-peer | Swarm discovery | Little bird protocol | Evaluation | Conclusions

  23. Central Tracker Peer-to-peer | Swarm discovery | Little bird protocol | Evaluation | Conclusions

  24. Central Tracker Peer-to-peer | Swarm discovery | Little bird protocol | Evaluation | Conclusions

  25. Central Tracker • Not scalable • Not reliable Peer-to-peer | Swarm discovery | Little bird protocol | Evaluation | Conclusions

  26. Mozart.mp3 Zwartboek.avi Simpsons.avi Distributed Hash Table Peer-to-peer | Swarm discovery | Little bird protocol | Evaluation | Conclusions

  27. 5 11 23 99 Mozart.mp3 21 21 21 21 Distributed Hash Table Mozart.mp3 members Peer-to-peer | Swarm discovery | Little bird protocol | Evaluation | Conclusions

  28. 5 11 23 99 21 21 Distributed Hash Table • Problems: • No relation: content responsible peer • No incentives to cooperate • No load balancing • No security Mozart.mp3 members Peer-to-peer | Swarm discovery | Little bird protocol | Evaluation | Conclusions

  29. Design Requirements • Requirements for our swarm discovery: • Effective: high swarm coverage • Scalable • Incentives to cooperate • Secure against misuse Peer-to-peer | Swarm discovery | Little bird protocol | Evaluation | Conclusions

  30. 4. Little Bird Protocol Gossip:A little bird told me… Peer-to-peer | Swarm discovery | Little bird protocol | Evaluation | Conclusions

  31. ? Little Bird Protocol • Two steps: • Bootstrapping: find initial peers • Discover rest of swarm: gossip Peer-to-peer | Swarm discovery | Little bird protocol | Evaluation | Conclusions

  32. Request Peerlist Swarm ID Already known peers Requester peer Responder peer New peer1 New peer2 New peer3 … Communication Peer-to-peer | Swarm discovery | Little bird protocol | Evaluation | Conclusions

  33. Wouter’s favorites Jan-Peter’s favorites Mozart.mp3 Mozart.mp3 Zwartboek.avi Beethoven.mp3 Simpsons.avi Bach.mp3 Bootstrapping • Find initial peer(s) in the swarm Mozart.mp3 Both peers are/were recently active in swarm of Mozart.mp3 Peer-to-peer | Swarm discovery | Little bird protocol | Evaluation | Conclusions

  34. Bootstrapping • After leaving swarm: cache swarm information • Measurements: double availability ? request Swarm database peerlist Peer addresses Peer-to-peer | Swarm discovery | Little bird protocol | Evaluation | Conclusions

  35. ! Gossip • Scalable • Robust Peer-to-peer | Swarm discovery | Little bird protocol | Evaluation | Conclusions

  36. ! ! ! Gossip Peer-to-peer | Swarm discovery | Little bird protocol | Evaluation | Conclusions

  37. ! ! ! ! ! ! ! ! Gossip Peer-to-peer | Swarm discovery | Little bird protocol | Evaluation | Conclusions

  38. ! ! ! ! ! ! ! ! ! ! ! Gossip Peer-to-peer | Swarm discovery | Little bird protocol | Evaluation | Conclusions

  39. ! ! ! request request request request request request request Gossipping Protocol • Additional security No forwarding • Load balancing Peer-to-peer | Swarm discovery | Little bird protocol | Evaluation | Conclusions

  40. Little Bird Contribution • Distinguish good from bad peers High contribution Low contribution Peer-to-peer | Swarm discovery | Little bird protocol | Evaluation | Conclusions

  41. Peerlist Peer1 Peer2 ? Kb/s request reply Contribution Indicators • Connectivity • Bartering activity • Swarm discovery activity • Swarm discovery quality Contribution Peer-to-peer | Swarm discovery | Little bird protocol | Evaluation | Conclusions

  42. Incentives • Contribution creates incentives for • BitTorrent High upload many connects • Little bird Give good peerlists many connects Peer-to-peer | Swarm discovery | Little bird protocol | Evaluation | Conclusions

  43. Wouter Peerlist Wouter Jan-Peter Mark Security • Check before you tell : only forward existing peers • Contribution: Attackers score lower • Fewer requests, bartering, not forwarded Peerlist Wouter Peer-to-peer | Swarm discovery | Little bird protocol | Evaluation | Conclusions

  44. 5. Evaluation Peer-to-peer | Swarm discovery | Little bird protocol | Evaluation | Conclusions

  45. Evaluation • Bootstrapping • General performance • Swarm coverage: part of swarm peer knows • Bandwidth • Attack resilience Peer-to-peer | Swarm discovery | Little bird protocol | Evaluation | Conclusions

  46. trackerless Bootstrap Evaluation • Decentralized publishing and swarm discovery • Small scale experiment • Publish • Join • Download • Successful Little bird+BuddyCast Peer-to-peer | Swarm discovery | Little bird protocol | Evaluation | Conclusions

  47. DAS-2 Supercomputer Node 1 Node 2 Node 3 … Realistic Emulation on DAS-2 Tribler Tribler Tribler Tribler Tribler Tribler Tribler Tribler Tribler Tribler • CROWDED • Swarm >300 Tribler applications Peer-to-peer | Swarm discovery | Little bird protocol | Evaluation | Conclusions

  48. Swarm Coverage Peer-to-peer | Swarm discovery | Little bird protocol | Evaluation | Conclusions

  49. Swarm Coverage Individual Peer Peer-to-peer | Swarm discovery | Little bird protocol | Evaluation | Conclusions

  50. Swarm Coverage Individual Peer Peer-to-peer | Swarm discovery | Little bird protocol | Evaluation | Conclusions

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