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Sources of our tests

The ideas behind our tests come from a variety of sources, most notably Panopticlick, Am I unique?, Fingerprintjs2, and Tor Project Trac tickets. The following is a list of each test and where the inspiration for it came from.

Note: We may not always cite the original source of a test. Please contact us if we misattribute a test.

Monitor contrast level

Original.

Colour vision

Original. [Test removed for ethics reasons]

User-agent string

Panopticlick.

HTTP_ACCEPT Headers

Panopticlick.

Platform (JavaScript)

Panopticlick.

Platform (Flash)

AmIUnique.

Browser plugin details

Panopticlick.

Time zone

Panopticlick.

Screen size and color depth

Panopticlick.

Screen size (Flash)

AmIUnique.

Screen size (CSS)

Based on a proof of concept from Arthur Edelstein.

Language (Flash)

AmIUnique.

System fonts (Flash)

Panopticlick.

System fonts (JS/CSS)

Fingerprintjs2.

System fonts (CSS)

Based on test in the JonDonym IP check test page.

Character Sizes

Based on work by David Fifield and Serge Egelmantalk.
Link to paper: Fingerprinting web users through font metrics

Are cookies enabled?

Panopticlick.

Limited supercookie test

Panopticlick.

HSTS enabled?

Test suggested anonymously by someone who referenced ghacks. A description of how you could plant a supercookie in someone's browser using HSTS can be found here.

IndexedDB enabled test

Fingerprintjs2.

Do Not Track header

Original.

Client/server time difference (minutes)

Tor Trac ticket #2940

Date/Time format test

Tor Trac ticket #15473

Math / Tan function

Tor Trac ticket #13018

Using Tor?

Original.

Tor Browser Bundle version

Original.

Blocking ads?

Original, but also found on AmIUnique.

Blocking like/share buttons?

Original.

Canvas

AmIUnique? and Fingerprintjs2.

WebGL vendor

AmIUnique?

WebGL renderer

AmIUnique?

Touch support

Fingerprintjs2.

Audio fingerprints

Code taken with permission from https://audiofingerprint.openwpm.com/. Tests discovered in the wild by Steven Englehardt and Arvind Narayanan in the paper Online tracking: A 1-million-site measurement and analysis.