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Class 20:Hidden Services,Zero Knowledge
Cryptocurrency Cabalcs4501 Fall 2015
David Evans and Samee ZahurUniversity of Virginia
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Plan for Today
Hidden Services using Tor
Zero Knowledge (today and next Weds)
Monday’s class:
PS3 is Due Sunday, 8:29pmOffice Hours: After class today: Samee (Rice 442) Thursday, 2:30-3:30: Dave (Rice 507)
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(Day before class started)
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(Day before class started)
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(Day before class started)
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Why the big increase?
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Anonymous Communication
Client Server
Node A
Node B
Node C
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Generate key pair
private public
address = first 10 bytes of H(public)
silkroadvb5piz3r.onionfacebookcorewwwi.onion
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Generate key pair
private public
address = first 10 bytes of H(public)
silkroadvb5piz3r.onionfacebookcorewwwi.onion
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Hidden Server
Introduction Point (Tor Relay)
Tor LinkDirectory Service
Client
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2
3
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Hidden Server
Introduction Point (Tor Relay)
Tor LinkDirectory Service
Client
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2
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Rendezvous Point(selected by Client) 4
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Hidden Server
Introduction Point (Tor Relay)
Tor LinkDirectory Service
Client
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2
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Rendezvous Point(selected by Client) 4
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Hidden Server
Introduction Point (Tor Relay)
Tor LinkDirectory Service
Client
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2
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Rendezvous Point(selected by Client) 4
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Hidden Server
Introduction Point (Tor Relay)
Tor LinkDirectory Service
Client
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2
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Rendezvous Point(selected by Client)
4
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channel between client and server,both only learn Rendezvous Point IP
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IEEE Security and Privacy 2006
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How did the FBI find the Silk Road Server?
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Architecture of Silk Road
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Back end server configuration:(released by FBI)
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Ross Ulbrict’s sentencing letter
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https://blockchain.info/address/1F1tAaz5x1HUXrCNLbtMDqcw6o5GNn4xqX
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https://blockchain.info/address/1F1tAaz5x1HUXrCNLbtMDqcw6o5GNn4xqX
Tim Draper (VC) ~$19M?
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Exhibit B Life in Prison
78 months
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Zero Knowledge
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ChargeProblem Set 3 due SundayUpcoming office hours:
Now: 3:30-4:30pm (Samee, Rice 442)Thursday: 2:30-3:30pm (Dave, Rice 507)
