On Wed, Aug 21, 2013 at 5:16 AM, Eugen Leitl <[1]eugen@leitl.org>
   wrote:

     This past January, Laura Poitras received a curious e-mail from an
     anonymous
     stranger requesting her public encryption key. For almost two years,
     Poitras
     had been working on a documentary about surveillance, and she
     occasionally
     received queries from strangers. She replied to this one and sent
     her public
     key allowing him or her to send an encrypted e-mail that only
     Poitras could
     open, with her private key

   Then the NSA MitMed her unauthenticated plaintext email, replacing her
   public key with theirs, and were able to intercept all of the Snowden
   emails. Oops!
   --
   Tony Arcieri

References

   1. mailto:eugen@leitl.org