The Most Secure Account of AllIf You Can Stand It

Published: Dec. 18, 2017, 7:59 a.m.

There was a time when high-status people signaled their worth with an ostentatious key fob for an expensive car. Today the keyring of an important person\u2014or at least a paranoid one\u2014might be distinguished by a less obvious marker: a pair of inconspicuous plastic dongles that protect an inbox full of secrets worth keeping.