[tor-bugs] #14917 [Tor]: Client's choice of rend point can leak info about hidden service's guard relay

[Tor Bug Tracker & Wiki]

#14917: Client's choice of rend point can leak info about hidden service's guard
relay
------------------------+--------------------------------
     Reporter:  arma    |      Owner:
         Type:  defect  |     Status:  new
     Priority:  normal  |  Milestone:  Tor: 0.2.7.x-final
    Component:  Tor     |    Version:
   Resolution:          |   Keywords:  SponsorR, tor-hs
Actual Points:          |  Parent ID:
       Points:          |
------------------------+--------------------------------

Comment (by arma):

 Replying to [comment:2 cypherpunks]:
 > GuardA -> Middle -> GuardA is too bizarre for anyone monitoring the
 network and sends red flags.
 > 2) Increase the hop by one just for this situation. GuardA -> Middle1 ->
 Middle2 -> GuardA

 Actually Tor does this one already -- the path length is "three hops not
 counting ones that other picked for you", so the hidden service makes
 GuardA -> Middle1 -> Middle2 and then extends that to the rendezvous
 point.

 > Edit:
 > 4) Take the shortcut and talk to the rend point directly.

 Hm! Not good for timing reasons, for one.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/14917#comment:3>
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