If you're trying to hide an extramarital affair, and you're the director of the Central Intelligence Agency, it's probably a good idea to use a method that hasn't been publicly known for years. Another good step would be avoiding a service, like Gmail, managed by a company that's been known to hand over information to the government when pressured. Perhaps David Petraeus and Paula Broadwell thought they were above all that, or perhaps they somehow didn't care, but the trick they used to hide their emails is old enough to have been included in a 2005 PBS special.
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