[tor-bugs] #10095 [TorBrowserButton]: Setting screen resolution to a multiple of 200 x 100 is not working reliably with patch in #8478

Tor Bug Tracker & Wiki blackhole at torproject.org
Mon Dec 30 15:03:36 UTC 2013


#10095: Setting screen resolution to a multiple of 200 x 100 is not working
reliably with patch in #8478
----------------------------------+--------------------------------
     Reporter:  gk                |      Owner:  mikeperry
         Type:  defect            |     Status:  new
     Priority:  critical          |  Milestone:
    Component:  TorBrowserButton  |    Version:
   Resolution:                    |   Keywords:  tbb-fingerprinting
Actual Points:                    |  Parent ID:
       Points:                    |
----------------------------------+--------------------------------

Comment (by cypherpunks):

 I've '''scraped Panopticlick''' results for TB 3.x requests with screens
 that are 1000 px wide and between 400 and 1400 px high. '''The 9 px bug
 seems to affect many people! '''

 bits = "your browser has a fingerprint that conveys x bits of identifying
 information"
 denominator = "one in x browsers have the same fingerprint as yours"

 Sorted by bits, discarding the 975 worst results where bits > 20:

 ||screen||bits||denominator||
 ||1000x600x24||15.7||53204||
 ||1000x591x24||17.13||143242||
 ||1000x891x24||17.24||155213||
 ||1000x700x24||17.58||196031||
 ||1000x900x24||17.66||206952||
 ||1000x691x24||18.13||286505||
 ||1000x590x24||18.37||338571||
 ||1000x800x24||18.51||372489||
 ||1000x500x24||18.83||465501||
 ||1000x1000x24||19.02||532190||
 ||1000x883x24||19.02||532157||
 ||1000x789x24||19.02||532123||
 ||1000x790x24||19.02||532123||
 ||1000x791x24||19.02||532124||
 ||1000x991x24||19.24||620886||
 ||1000x787x24||19.51||744972||
 ||1000x892x24||19.83||931280||
 ||1000x572x24||19.83||931057||
 ||1000x400x24||19.83||930928||
 ||1000x1300x24||19.83||931488||
 ||1000x888x24||19.83||931279||
 ||1000x898x24||19.83||931282||
 ||1000x673x24||19.83||931129||
 ||1000x798x24||19.83||931221||
 ||1000x598x24||19.83||931075||
 ||1000x599x24||19.83||931075||

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/10095#comment:7>
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