[tor-bugs] #5343 [Tor Client]: Require a threshold of exit nodes before believing we can build circuits

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#5343: Require a threshold of exit nodes before believing we can build circuits
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 Reporter:  nickm       |          Owner:                    
     Type:  defect      |         Status:  new               
 Priority:  major       |      Milestone:  Tor: 0.2.2.x-final
Component:  Tor Client  |        Version:                    
 Keywords:              |         Parent:                    
   Points:              |   Actualpoints:                    
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 We should not allow circuits to get built unless we know descriptors for a
 sufficiently large fraction of exit nodes.

 This should mitigate an attack proposed by wanoskarnet, wherein your
 bridges collude to only tell you about compromised exits.  See also #5342.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/5343>
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