Browser tracking through "canvas fingerprinting"

Recently, public attention has been called to a new online user-tracking method that is purported to be nearly impossible to block. Called "canvas fingerprinting," the technique relies on forcing the browser to generate an image on the client side of the connection—an image that is unique enough to serve as a fingerprint for the browser that created it. In fact, the basis for this fingerprinting approach is several years old, but it does now seem to be in use in the wild. Whether or not it truly amounts to an insurmountable blocking challenge, however, remains to be seen.

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