A new set of leaked NSA slides from the Snowden trove was published in the Washington Post today, detailing NSA/GCHQ's use of Web cookies (including Google's PREF cookie) to uniquely identify people as they move around the Web, in order to target them and compromise them.

They also report on an NSA program called HAPPYFOOT that uses mobile phones to do very fine-grained tracking of targets.

Ed Felten, an eminent computer scientist and security researcher, has written a lengthy comment on the disclosures, exploring the different options companies have if they want to safeguard their tracking cookies from being hijacked by the NSA. His primary recommendation is that these cookies should only be sent over SSL.

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