[tor-bugs] #8742 [Tor]: Byte history leaks information about local usage/hidden services

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#8742: Byte history leaks information about local usage/hidden services
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 Reporter:  alphawolf                                    |          Owner:                     
     Type:  defect                                       |         Status:  new                
 Priority:  normal                                       |      Milestone:  Tor: unspecified   
Component:  Tor                                          |        Version:  Tor: 0.2.4.12-alpha
 Keywords:  byte-history stats tor-hs privacy tor-relay  |         Parent:                     
   Points:                                               |   Actualpoints:                     
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Comment(by alphawolf):

 Replying to [comment:1 nickm]:

 > Directory caches also write more than they read.

 True... but in this case I happen to know that his particular relay has
 had a DirPort open for months, and began hosting a hidden service/relaying
 local network traffic around Apr-7.  The divergence of read/write bytes is
 pretty obvious at that point.  Prior to that date there is only a slight
 bias to more write traffic.  Accepting that other directory caches might
 have a more pronounced bias, I still believe the attack I describe would
 be successful, as the attacker could create a divergence pattern that
 would be otherwise unlikely.  It would of course require testing to
 confirm.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/8742#comment:2>
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