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Can someone tell me how these super cookies work? Cookies can only be read in the domain/origin they were set, so how is a cookie passing data off to other domains?

Or is it just as simple as two companies working together and fingerinting and matching thereby making that called a super cookie?

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SuperCookies are generally considered to be cookies that recreate themselves after deletion. A variety of techniques are used for this, ranging from cooperating domain to flash cookies to local storage.

Information us passed between sites using JavaScript and backend cooperation on ID matching.

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