[tor-bugs] #20214 [Applications/Tor Browser]: Ultrasound Cross Device Tracking techniques could be used to launch deanonymization attacks against some users

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#20214: Ultrasound Cross Device Tracking techniques could be used to launch
deanonymization attacks against some users
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 Reporter:  VasiliosMavroudis         |          Owner:  tbb-team
     Type:  defect                    |         Status:  new
 Priority:  Medium                    |      Milestone:
Component:  Applications/Tor Browser  |        Version:
 Severity:  Normal                    |     Resolution:
 Keywords:                            |  Actual Points:
Parent ID:                            |         Points:
 Reviewer:                            |        Sponsor:
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Comment (by flyingbird):

 Ultrasound can also be easily generated and emitted with JavaScript using
 the Web Audio Api (without the need to encode it into any media files).
 Also it can easily be encoded in a 44khz wav file, which is supported by
 Firefox. I think that filtering out the inaudible frequencies by default
 would be a good idea.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20214#comment:11>
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