Think you cleared all the offline data from your browser? Think again.
Where things really get grim is with the mobile version of Safari. Although this version of Safari doesn’t support Flash or Silverlight, the directories it uses to hold local storage are sandboxed off from all other applications, and there is apparently no way to delete this. To clear evercookie from an iPhone, White first had to jailbreak it and then run a script. Worse still, any application that uses a Web view to display HTML content also creates an individual risk; White’s script has to crawl through the entire phone’s directory structure to purge them all.
Cleared all browsing data? Go here to clear your flash cookies. Trust me, they’re there.