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NSA tracks Google ads to find Tor users
The National Security Agency uses a bit of jiu-jitsu to turn the structure of Web ad networks against people who run Tor to remain anonymous.
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 promotes itself as helping people "defend against traffic analysis, a form of network surveillance that threatens personal freedom and privacy, confidential business activities and relationships, and state security." Director of National Intelligence James Clapper criticized reporters and denied that his office was doing anything illegal, citing the threat of "adversaries."
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