supercookie

plural supercookies

1. informalcomputingA data store on a user's computer that can be accessed by websites and used as a more persistent form of cookie.

   While doing an online security scan, I was told I can ^([sic]) a vulnerability because of the presence of a supercookie.

   2005, Boojum, “Supercookie”, in microsoft.public.security (Usenet)

   2 more examples

   The SharedObject class is familiar to many Flash programmers as a way to create a kind of supercookie; a local shared object (LSO) can store ActionScript data on the client between sessions.

   2005, Brian Lesser, Giacomo Guilizzoni, Robert Reinhardt, Programming Flash Communication Server

   I use the SR Ware Iron Browser, always on Incognito, and set to remove all data when i close the pane. I also remove all records after each day. Can you tell me, does this remove the supercookies?

   2009, Billy, “Adobe's Flash Player sets "supercookies"”, in alt.comp.freeware (Usenet)