Petraeus and Broadwell composed draft emails on a shared private email account for communication. Why didn't they use PGP encrypted email? Doesn't everyone know that email is open? Worst email privacy ever: Gmail, Google keeps all forever - even though you deleted them.
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The guy who invented PGP was going to be tried and convicted because US couldn't break the code (so far - wait until quantum computing exists!) Well he's from Finland - so can't convict. PGP has to be set up b4 hand between 2 people. But it's easy.