The New Web Tracking Method Using Favicons, Explained

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The paper: https://www.cs.uic.edu/~polakis/papers/solomos-ndss21.pdf Firefox bug report: https://bugzilla.mozilla.org/show_bug.cgi?id=1618257 Avg. loading speed of websites: https://0x65.dev/static/docs/studies/tracker_tax.pdf Demo of Favicon tracking: https://supercookie.me Additional sources: https://arstechnica.com/information-technology/2021/02/new-browser-tracking-hack-works-even-when-you-flush-caches-or-go-incognito/ https://www.schneier.com/blog/archives/2021/02/browser-tracking-using-favicons.html

Many common web tracking methods still revolve around cookies but device fingerprinting is getting much more effective at avoiding the usual countermeasures. A new type of fingerprinting was now presented by a researcher group from Chicago: By exploiting the small website icons called Favicons visible on each browser tab, it is possible to create a unique identifier using subdomains and redirections that cannot be blocked by anti-tracking extensions, clearing cookies or even incognito mode.

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