Re: [tor-bugs] #16672 [Tor Browser]: Text rendering allows fingerprinting

["Tor Bug Tracker & Wiki" <blackhole@xxxxxxxxxxxxxx>]

#16672: Text rendering allows fingerprinting
---------------------------+-----------------------------------------------
     Reporter:             |      Owner:  tbb-team
  arthuredelstein          |     Status:  new
         Type:  defect     |  Milestone:
     Priority:  normal     |    Version:
    Component:  Tor        |   Keywords:  tbb-fingerprinting-fonts, tbb-5.0
  Browser                  |  Parent ID:
   Resolution:             |
Actual Points:             |
       Points:             |
---------------------------+-----------------------------------------------

Comment (by dcf):

 Here is a sample of how rendering differs on two Debian 8 systems with the
 same bundled fonts (Tor Browser 5.0a4). It's an animation with two frames,
 wait for it to cycle.
 [[Image(5.0a4-debian-fonttest.gif)]]
 The rendering is quite different, even if the integer pixel metrics are
 the same. (Canvas fingerprinting would not be fooled.) In this case, the
 checksum difference is not because the rendering settings, but because of
 [https://lists.torproject.org/pipermail/tor-qa/2015-August/000654.html
 font selection in one code point], which is unrelated to this ticket.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/16672#comment:12>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online
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