// supercookies
what is evercookie (redundant multi-store respawn)?
Samy Kamkar's 2010 kitchen-sink: write one id into a dozen stores at once (HTTP + Flash LSO + Silverlight + localStorage + sessionStorage + IndexedDB + a force-cached PNG read back via canvas + ETag + window.name + HSTS), then respawn it from any survivor when the others are cleared.. Fast-decaying: browser mitigations land release-to-release; asOf 2026-06-15. Distilled from the richards supercookies catalog.
source capture as of 2026-06-15
in the benchmark
evercookie (redundant multi-store respawn) is tracked as part of the supercookies taxonomy. see how tracked tools score against it on the capability matrix.