[tbb-bugs] #13313 [Tor Browser]: Enable bundled fonts in Tor Browser

Tor Bug Tracker & Wiki blackhole at torproject.org
Mon Jul 27 04:47:31 UTC 2015

#13313: Enable bundled fonts in Tor Browser
     Reporter:  dcf      |      Owner:  tbb-team
         Type:           |     Status:  needs_review
  enhancement            |  Milestone:
     Priority:  normal   |    Version:
    Component:  Tor      |   Keywords:  tbb-fingerprinting-fonts,
  Browser                |  tbb-5.0a4, TorBrowserTeam201507R
   Resolution:           |  Parent ID:
Actual Points:           |
       Points:           |

Comment (by dcf):

 Replying to [comment:26 arthuredelstein]:
 > Whoa, interesting result. I think, though, that it's a form of OS
 fingerprinting, similar to #13018, or am I missing something? Whereas this
 ticket attempts to solve an orthogonal problem, which is that it is
 possible to enumerate the system fonts installed on a user's machine.

 Whitelisting font files is meant to solve both: enumeration of font names,
 and differences in glyph rendering. Differences in glyph rendering provide
 much more precision than just the OS--it can vary based on what fonts are
 installed, what antialiasing settings you use, and what graphics card you
 have, for example. Glyph rendering is in scope for this ticket--that's the
 idea behind enforcing a single list of exact font files, not just a single
 list of font names. By standardizing the list of font file and rendering
 settings you should be able to bring down the variability a lot. See
 figures 4 and 5 on page 13 of https://bamsoftware.com/papers/fontfp.pdf.

Ticket URL: <https://trac.torproject.org/projects/tor/ticket/13313#comment:28>
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