The National Security Agency analyzes tracking cookies used by online advertisers in order to find and target surveillance subjects, according to The Washington Post and documents provided by Edward Snowden. The NSA and British GCHQ are using ad tracking cookies to identify unique online users, and are apparently particularly partial to a Google-specific cookie format known as a PREF cookie. The NSA likes the cookies because they allow them to enable remote exploitation, although what they means exactly is unclear.
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