[tor-bugs] #5456 [Tor Client]: Defend against path bias and tagging attacks

["Tor Bug Tracker & Wiki" <torproject-admin@xxxxxxxxxxxxxx>]

#5456: Defend against path bias and tagging attacks
------------------------+---------------------------------------------------
 Reporter:  mikeperry   |          Owner:     
     Type:  defect      |         Status:  new
 Priority:  major       |      Milestone:     
Component:  Tor Client  |        Version:     
 Keywords:              |         Parent:     
   Points:              |   Actualpoints:     
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 In https://lists.torproject.org/pipermail/tor-dev/2012-March/003347.html,
 some dude who claims to be a raccoon proved that tagging attacks are an
 amplification attack that allow an adversary who has c/n of the network
 bandwidth to compromise of c/n of all  circuits through the network.

 The tagging attack he describes is actually a subset of path bias attacks
 we've known about for a long time. Tagging is just a particularly nasty
 one that also allows for a level of amplification that we previously were
 not aware of.

 This ticket is to serve as the parent ticket for several things we can do
 to improve the situation and defend against tagging in specific or path
 bias in general.

-- 
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/5456>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online
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