[tor-bugs] #13021 [Tor Browser]: Review Canvas APIs for fingerprintability

Mon Sep 1 21:24:31 UTC 2014

#13021: Review Canvas APIs for fingerprintability
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 Reporter:  mikeperry                            |          Owner:  tbb-
     Type:  task                                 |  team
 Priority:  major                                |         Status:  new
Component:  Tor Browser                          |      Milestone:
 Keywords:  ff31-esr, tbb-fingerprinting,        |        Version:
  TorBrowserTeam201409                           |  Actual Points:
Parent ID:                                       |         Points:
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 There were some changes to the HTML5 canvas object. I think toBlob() was
 added, and possibly other extractors as well:
 https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D

 There is now also a hint that JS wants to read the canvas. Probably
 irrelevant to us, but worth looking at in more detail:
 https://bugzilla.mozilla.org/show_bug.cgi?id=884226

 There's also something called HitRegions. I'm not sure what these are at
 all:
 https://bugzilla.mozilla.org/show_bug.cgi?id=966591

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/13021>
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