Fp-Scanner: The Privacy Implications of Browser Fingerprint Inconsistencies
summary
FP-Scanner probes four axes—operating system, browser, device and canvas—for cross-attribute contradictions and flags modified fingerprints. The authors build a test suite and evaluate it against seven countermeasures (simple UA spoofers, Brave/Firefox protections, canvas extensions, FPRandom, etc.) and report near‑perfect detection of altered fingerprints; it recovers real OS and browser families (not exact minor versions). A concrete break of canvas defender uses toDataURL/getImageData signatures and DOM injection to recover originals; the extension has about 25,000 users and leaks a stable noise vector.
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chapters (14)
- 0:00Intro
- 0:29Browser fingerprinting in a nutshell
- 1:22Defense against fingerprinting
- 2:06Detecting countermeasures (2)
- 3:42FP Scanner
- 5:14Browser inconsistencies (1)
- 6:02Device inconsistencies
- 6:29Canvas inconsistencies (2)
- 7:59Evaluation
- 9:46Tests failed by countermeasures
- 10:40Recovering ground values
- 11:55Privacy implications
- 13:37Example: Canvas Defender (3)
- 16:45Conclusion
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