Just because the National Security Agency hasn't cracked the anonymizing service Tor doesn't mean that people who use the service are free from surveillance.
The NSA has been able to use ad networks like Google's, and The Onion Router's own entry and exit nodes on the Internet, to follow some Tor users, according to a new report based on documents leaked by whistleblower Edward Snowden and obtained by security researcher Bruce Schneier with the Guardian. Tor is primarily funded by the US State Department and the Department of Defense, home of the NSA.
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