"The NSA buys ads from ad display companies like Google and seeds them around Tor's access points.
"The NSA then cookies that ad, so that every time you go to a site, the cookie identifies you. Even though your IP address changed [because of Tor], the cookies gave you away," he said.
This is not some complicated or even an unusual trick, Grossman said. It's how tracking ads were intended to function.
"That's the Web by design, not a hack," he said."
Just something else to think about.
H/t JWR @ The Survival Blog
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