[tor-bugs] #10969 [Tor]: Set of guard nodes can act as a linkability fingerprint

[Tor Bug Tracker & Wiki]

#10969: Set of guard nodes can act as a linkability fingerprint
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 Reporter:  asn                                  |          Owner:
     Type:  defect                               |  mikeperry
 Priority:  Medium                               |         Status:
Component:  Tor                                  |  assigned
 Severity:  Normal                               |      Milestone:  Tor:
 Keywords:  tor-client, tor-guard,               |  0.2.8.x-final
  026-triaged-1, XKEYSCORE                       |        Version:
Parent ID:  #11480                               |     Resolution:
  Sponsor:                                       |  Actual Points:
                                                 |         Points:  large
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Comment (by cypherpunks):

 Is this really a worthwhile problem to solve? If there there is any non-
 Tor network traffic, it likely contains some unique identifier anyway
 (cookies, session ids, unique ids in update checks; the set of update
 checks is likely unique; standard browsers likely have a unique
 fingerprint that is probed by ad networks).

 Users who are not able to set guard nodes manually, will more than likely
 run into one of the things mentioned above.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/10969#comment:19>
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