You Deleted Your Cookies? Think Again (Wired)

Wired looks at the use of Flash cookies implemented by Adobe's browser plugin. "Several services even use the surreptitious data storage to reinstate traditional cookies that a user deleted, which is called ‘re-spawning’ in homage to video games where zombies come back to life even after being 'killed,' the report found. So even if a user gets rid of a website’s tracking cookie, that cookie’s unique ID will be assigned back to a new cookie again using the Flash data as the 'backup.'" See also this 2008 post from Gnash developer Rob Savoye, as well as an LWN article from last October, for more information on Flash cookies.

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