WaPo reports:
On Nov. 1, 2007, the National Security Agency hosted a talk by Roger Dingledine, principal designer of one of the world’s leading Internet privacy tools. It was a wary encounter, akin to mutual intelligence gathering, between a spy agency and a man who built tools to ward off electronic surveillance.
According to a top-secret NSA summary of the meeting, Dingledine told the assembled NSA staff that his service, called Tor, offered anonymity to people who needed it badly — to keep business secrets, protect their identities from oppressive political regimes or conduct research without revealing themselves. In the minds of NSA officials, Tor was offering protection to terrorists and other intelligence targets.
As he spoke to the NSA, Dingledine said in an interview Friday, he suspected the agency was attempting to break into Tor, which is used by millions of people around the world to shield their identities. Documents provided to The Washington Post by former agency contractor Edward Snowden show that he was right.
Beginning at least a year before Dingledine’s visit, the NSA has mounted increasingly successful attacks to unmask the identities and locations of users of Tor. In some cases, the agency has succeeded in blocking access to the anonymous network, diverting Tor users to insecure channels. In others, it has been able to “stain” anonymous traffic as it enters the Tor network, enabling the NSA to identify users as it exits.
Read the rest here.
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