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Hidden Services, Zero Knowledge

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http://www.bitcoin-class.org
Cryptocurrency Cabal
University of Virginia
Fall 2015

Published in: Business
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Hidden Services, Zero Knowledge

  1. 1. Class 20: Hidden Services, Zero Knowledge Cryptocurrency Cabal cs4501 Fall 2015 David Evans and Samee Zahur University of Virginia
  2. 2. Plan for Today Hidden Services using Tor Zero Knowledge (today and next Weds) 1 Monday’s class: PS3 is Due Sunday, 8:29pm Office Hours: After class today: Samee (Rice 442) Thursday, 2:30-3:30: Dave (Rice 507)
  3. 3. What’s going on!???!? 2 August 26, 2015 BTC: $225
  4. 4. 3 (Day before class started)
  5. 5. 4 (Day before class started)
  6. 6. 5 (Day before class started)
  7. 7. Why the big increase? 6
  8. 8. 7
  9. 9. 8
  10. 10. Anonymous Communication 9 Client Server Node A Node B Node C
  11. 11. 10
  12. 12. 11 Generate key pair private public address = first 10 bytes of H(public) silkroadvb5piz3r.onion facebookcorewwwi.onion
  13. 13. 12 Generate key pair private public address = first 10 bytes of H(public) silkroadvb5piz3r.onion facebookcorewwwi.onion
  14. 14. 13 Hidden Server Introduction Point (Tor Relay) Tor Link Directory Service Client 1 2 3
  15. 15. 14 Hidden Server Introduction Point (Tor Relay) Tor Link Directory Service Client 1 2 3 Rendezvous Point (selected by Client) 4
  16. 16. 15 Hidden Server Introduction Point (Tor Relay) Tor Link Directory Service Client 1 2 3 Rendezvous Point (selected by Client) 4 5
  17. 17. 16 Hidden Server Introduction Point (Tor Relay) Tor Link Directory Service Client 1 2 3 Rendezvous Point (selected by Client) 4 56
  18. 18. 17 Hidden Server Introduction Point (Tor Relay) Tor Link Directory Service Client 1 2 3 Rendezvous Point (selected by Client) 4 56 channel between client and server, both only learn Rendezvous Point IP
  19. 19. 18 IEEE Security and Privacy 2006
  20. 20. How did the FBI find the Silk Road Server? 19
  21. 21. 20
  22. 22. 21
  23. 23. 22
  24. 24. Architecture of Silk Road 23
  25. 25. 24 Back end server configuration: (released by FBI)
  26. 26. 25 Ross Ulbrict’s sentencing letter
  27. 27. 26 https://blockchain.info/address/1F1tAaz5x1HUXrCNLbtMDqcw6o5GNn4xqX
  28. 28. 27 https://blockchain.info/address/1F1tAaz5x1HUXrCNLbtMDqcw6o5GNn4xqX Tim Draper (VC) ~$19M?
  29. 29. 28 Exhibit B Life in Prison 78 months
  30. 30. Zero Knowledge 29
  31. 31. Charge Problem Set 3 due Sunday Upcoming office hours: Now: 3:30-4:30pm (Samee, Rice 442) Thursday: 2:30-3:30pm (Dave, Rice 507) 30

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