[tbb-bugs] #13018 [Applications/Tor Browser]: Math routines are OS fingerprintable

Tor Bug Tracker & Wiki blackhole at torproject.org
Sat May 18 23:48:12 UTC 2019

#13018: Math routines are OS fingerprintable
 Reporter:  mikeperry                            |          Owner:  tbb-
                                                 |  team
     Type:  defect                               |         Status:  new
 Priority:  Medium                               |      Milestone:
Component:  Applications/Tor Browser             |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  tbb-fingerprinting-os-version,       |  Actual Points:
  ff31-esr                                       |
Parent ID:                                       |         Points:
 Reviewer:                                       |        Sponsor:

Comment (by Thorin):

 I have done more testing, and improved the output in my test: including a
 red info if I haven't seen the hash before. I have now found that TB on
 Linux actually has more entropy than originally thought. After testing 5
 distros (a mix of flavors and architecture) I have 3 distinct Linux
 buckets (it's not enough to distinguish the actual platform, at least not
 in all cases, yet). I will be adding more distros to investigate further.

Ticket URL: <https://trac.torproject.org/projects/tor/ticket/13018#comment:33>
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