Others failed to make backup copies of their private encryption keys, so when their hard drives crashed, they lost access to their encrypted e-mail.
From a legal perspective, stealing trade secrets — say, hacking into a competitor's encrypted e-mails — is out of bounds.
Nelson ran down a long list of potential options for discreet communication, including dummy Twitter accounts, disposable cellphones and encrypted e-mails.
As Sharp talks, I think about all the activists in Syria today who work underground, communicating via Skype or encrypted e-mails to protest the regime.
It could, for instance, allow a server hosting a wealth of encrypted e-mails to decrypt just the senders' names, for search purposes.
There are a few items related to the recent James Comey chaos, like a series of very simplistically encrypted e-mails that Sergey Lavrov, Russia's foreign minister, sent to Trump.
Under the Pentagon contract, Mr. Clarridge's team of private spies regularly sent encrypted e-mails about militant activity in Pakistan and Afghanistan to a military information operations center in Kabul.
But the terrorists can still move cash around via the informal hawala system of banking, an old modus operandi that helps them to evade detection, as do new ones such as chat-rooms and encrypted e-mails.
Encrypted incoming e-mails are often decrypted as they arrive, so all the three researchers had to do was send the laptops encrypted e-mails carefully crafted so the acoustic leakage produced by decrypting them was specifically related to the value of particular bits in the key.
Mr Snowden is introduced to the viewer in the same way that he introduced himself to Ms Poitras as a mysterious sender of encrypted e-mails, promising to provide information about what he saw as a massive, unjustified intrusion into the private lives of every individual with a telephone or a computer.
He advised Mr. Mars to use encrypted e-mail.
