Browser ‘Favicons’ Can Be Used as Undeletable ‘Supercookies’ to Track You Online - Favicons can break through incognito mode, VPNs, and Pi-holes to track your movement online
That's really fascinating, it always astounds me how people are able to think outside the box like this.
"By combining the state of delivered and not delivered favicons for specific URL paths for a browser, a unique pattern (identification number) can be assigned to the client. "
I'm having trouble figuring out how you could use this to persistently track a user across the net as opposed to just one website. Or would you have so many sub-pages with different fav-icons that it'd be easy to track a user based on what they did and didn't have cached? That makes a lot more sense to me.
I also have to wonder with large sites, you might have so many users with so many different permutations of served and not-served fav-icons (which surely have quite a limited pool in the wild) that it'd be numerically somewhat unlikely to actually keep track of them?
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