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September 30, 2019 03:21 pm

Looking Back at the Snowden Revelations

Matthew Green, a cryptographer and professor at Johns Hopkins University, writes: So what did Snowden's leaks really tell us? The brilliant thing about the Snowden leaks was that he didn't tell us much of anything. He showed us. Most of the revelations came in the form of a Powerpoint slide deck, the misery of which somehow made it all more real. And despite all the revelation fatigue, the things he showed us were remarkable. I'm going to hit a few of the highlights from my perspective. Many are cryptography-related, just because that's what this blog is about. Others tell a more basic story about how vulnerable our networks are. "Collect it all" Prior to Snowden, even surveillance-skeptics would probably concede that, yes, the NSA collects data on specific targets. But even the most paranoid observers were shocked by the sheer scale of what the NSA was actually doing out there. The Snowden revelations detailed several programs that were so astonishing in the breadth and scale of the data being collected, the only real limits on them were caused by technical limitations in the NSA's hardware. Most of us are familiar with the famous examples, like nationwide phone metadata collection. But it's the bizarre, obscure leaks that really drive this home. "Optic Nerve": From 2008-2010 the NSA and GCHQ collected millions of still images from every Yahoo! Messenger webchat stream, and used them to build a massive database for facial recognition. The collection of data had no particular rhyme or reason -- i.e., it didn't target specific users who might be a national security threat. It was just... everything.

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