[tor-bugs] #12807 [BridgeDB]: Implement an anonymous credential system for BridgeDB's Social Distributor

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#12807: Implement an anonymous credential system for BridgeDB's Social Distributor
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 Reporter:  isis              |          Owner:  isis
     Type:  project           |         Status:  new
 Priority:  normal            |      Milestone:
Component:  BridgeDB          |        Version:
 Keywords:  bridgedb-socdist  |  Actual Points:
Parent ID:                    |         Points:
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 BridgeDB's Social Distrubtor is going to need anonymous credentials if it
 is to safely gather information on bridge usage and/or blockage (used to
 determine the users' good/bad behaviour). This is briefly touched upon in
 §5.3.1 of the
 [https://people.torproject.org/~isis/papers/rBridge:%20User%20Reputation%20based%20Tor%20Bridge%20Distribution%20with%20Privacy%20Preservation.copy%20with%20notes.pdf
 rBridge paper]. I propose implementing and using Camenisch-Lysanskaya 2008
 (CL08) credentials, as described in
 [https://people.torproject.org/~isis/papers/Randomizable%20Proofs%20and%20Delegatable%20Anonymous%20Credentials.pdf
 this paper].

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/12807>
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