[tor-bugs] #30532 [- Select a component]: font FP reveals different Windows releases

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#30532: font FP reveals different Windows releases
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 Reporter:  Thorin              |          Owner:  (none)
     Type:  defect              |         Status:  new
 Priority:  Medium              |      Component:  - Select a component
  Version:                      |       Severity:  Normal
 Keywords:  tbb-fingerprinting  |  Actual Points:
Parent ID:                      |         Points:
 Reviewer:                      |        Sponsor:
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 based on Arthur's work [1], I have been looking at the enumerate fonts FP
 for TB 8 and 8.5a and various platforms.

 [1] https://ghacksuserjs.github.io/TorZillaPrint/TorZillaPrint.html#fonts
 ^^ just click run tests, and the only test I have actually added is the
 one we're concerned about

 - Linux distros all seem to be the same - I will test more
 - I do not have a Mac, but I do have one result, should anyone like to
 contribute, and I don't think Macs would vary
 - But I found Windows (so far in three out 3 cases) is revealing the major
 version and maybe the architecture. I believe this might be fixed by
 looking at the font whitelist, but Windows 10 is a rather drastic change
 (at least from Win7).
 - I will try and get Win10-32bit, Win8.1 32+64bit results to build a
 complete picture of Windows font entropy. **If you can provide it instead
 of me trying to find isos and setting up more VMs, then please do**

 So here are some results (8.0.9, 8.5a12)
 - Win 7  32bit: `9e5d39b4542cd5e2a19f73b8fa566e679fa561e5` (62 fonts)
 - Win 7  64bit: `ad4ccd607603041d3e89aa8e03e2e203fc184653` (61 fonts)
 - Win8.1 32bit: please help
 - Win8.1 64bit: please help
 - Win 10 32bit: please help
 - win 10 64bit: `1389aaf4c97027b8157c5fb9ef5ed6f141a6b8a1` (36 fonts)

 also, FYI
 - mint (32/64bit), ubuntu, debian:
 `09a4ee037c9082b9b8f0b7ae981c656d517faffa`
 - mac 10.14: `4094aedc000205c711385fad32827e60462976dc`

 Note that the 1 font difference between Win7 32 and 64 bit is just the
 count, there are actually three changes. I will post the font lists for
 the three windows results in the next post

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/30532>
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