[tbb-bugs] #13400 [Tor Browser]: Canvas Fingerprinting: fonts

Tor Bug Tracker & Wiki blackhole at torproject.org
Mon Oct 20 16:01:57 UTC 2014

#13400: Canvas Fingerprinting: fonts
     Reporter:  cypherpunks  |      Owner:  tbb-team
         Type:  defect       |     Status:  new
     Priority:  major        |  Milestone:
    Component:  Tor Browser  |    Version:
   Resolution:               |   Keywords:
Actual Points:               |  Parent ID:
       Points:               |

Comment (by gacar):

 Replying to [comment:4 mcs]:
 > We could change canvas measureText() to return a rounded number or
 disable it entirely, but it may not be worth it.  A real solution will
 require fixing #13313 or another approach.

 Wouldn't it make sense to put the `measureText()` behind the canvas dialog
 until we get the bundled fonts ready? I thought this was the idea in
 [https://trac.torproject.org/projects/tor/ticket/13021 #13021] and I
 assume #13313 may take some time, though, dcf may have a better estimate.

Ticket URL: <https://trac.torproject.org/projects/tor/ticket/13400#comment:5>
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