[tor-bugs] #5459 [Torflow]: Exit scanner should scan for Guard <-> Exit reachability

Tor Bug Tracker & Wiki torproject-admin at torproject.org
Tue Apr 3 22:48:02 UTC 2012


#5459: Exit scanner should scan for Guard <-> Exit reachability
-----------------------+----------------------------------------------------
 Reporter:  mikeperry  |          Owner:  aagbsn  
     Type:  defect     |         Status:  assigned
 Priority:  major      |      Milestone:          
Component:  Torflow    |        Version:          
 Keywords:             |         Parent:  #5456   
   Points:             |   Actualpoints:          
-----------------------+----------------------------------------------------

Comment(by arma):

 Replying to [comment:4 reganeet]:
 > 2. I don't know much about "tagging and path bias attackers" and how
 this test should work. How should I figure it out?

 http://freehaven.net/anonbib/#ccs07-doa is the original paper on the
 topic.

 The very short version of the issue is that an adversary who runs some
 relays can try to fail circuits that a) use one or more of his relays but
 b) he can't do traffic analysis on because his relays aren't in the right
 positions in the circuit to win. That will cause the user to make a new
 circuit, giving the attacker more chances at winning.

-- 
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/5459#comment:5>
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