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Metadata
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Metadata: The Half of Privacy That Encryption Doesn't Cover
Michael Hayden – the only person to have run both the NSA and the CIA – told a 2014 debate at Johns Hopkins, “We kill people based on metadata.” The line was not a boast about breaking encryption. It was the opposite point: for a great many purposes, nobody needs to. The earlier posts in this series looked at what encryption guarantees, and at who holds the keys. This one concerns everything those guarantees leave exposed: the data about the data. Who communicated with whom. When, how often, in what bursts, from which locations, on which devices, in messages of what size. Content encryption – even flawless, end-to-end, key-custody-correct encryption – conceals none of it.
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