Opened 5 years ago

Closed 4 years ago

#8076 closed defect (duplicate)

Investigate fingerprinting display DPI

Reported by: mikeperry Owned by: tbb-team
Priority: High Milestone:
Component: Applications/Tor Browser Version:
Severity: Keywords: tbb-fingerprinting, tbb-testcase, tbb-firefox-patch
Cc: gk, poly, isis, mikeperry, pete@… Actual Points:
Parent ID: Points:
Reviewer: Sponsor:

Description

So far, we've not bothered spoofing DPI because there does not seem to be a large amount of variability. We should perhaps study this (#6119?) and see if it's actually true. Here's a simple JS-based test: http://browserspy.dk/resolution.php

This information is also now available to CSS:
https://developer.mozilla.org/en-US/docs/CSS/resolution

Child Tickets

Change History (8)

comment:1 Changed 5 years ago by mikeperry

Summary: Investigate fingerprinting monitor DPIInvestigate fingerprinting display DPI

comment:2 Changed 5 years ago by gk

Cc: g.koppen@… added

comment:3 Changed 5 years ago by mikeperry

This information is now available to JS as window.devicePixelRatio: https://bugzilla.mozilla.org/show_bug.cgi?id=564815

comment:4 Changed 5 years ago by gk

Cc: gk added; g.koppen@… removed
Keywords: tbb-testcase added

comment:5 Changed 4 years ago by erinn

Keywords: tbb-firefox-patch added

comment:6 Changed 4 years ago by erinn

Component: Firefox Patch IssuesTor Browser
Owner: changed from mikeperry to tbb-team

comment:7 Changed 4 years ago by gk

Cc: poly isis mikeperry pete@… added

See: http://darkdepths.net/dpi-leaks-in-tor-browser.html for a handy PoC. Resolved #13875 as duplicate.

comment:8 Changed 4 years ago by mikeperry

Resolution: duplicate
Status: newclosed

I actually think we should dup this the other way, for two reasons:

  1. This ticket was about investigation. I feel like we've done that and #13875 has found a specific issue.
  2. #13875 has way more details and is quite specific in terms of the issue and related problems.
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