Charlie Miller, a former National Security Agency hacker who is
the one of the world's best-known security experts, declined to
comment on his departure or say what he would do next.
A Twitter spokesman could not immediately be reached for
comment.
Miller's latest feat, breaking into a moving Jeep as it drove on
the highway, was done with IOActive researcher Chris Valasek and
was the subject of talks at this month's security conferences in
Las Vegas.
Their efforts, which were coordinated with manufacturer Fiat
Chrysler Automobiles NV, prompted the first vehicle recall to
protect drivers from possible malicious hacking.
FCA USA LLC recalled 1.4 million vehicles to install software
intended to prevent hackers from emulating the experiment, which
used the cellular network to enter the entertainment system and
then win control of the engine, brakes and steering.
Shares in Twitter, which is seeking a permanent chief executive
officer, have fallen by more than 40 percent from the first day
of trading in 2013 level and set a record low as the broader
market sank on Monday.
(Reporting by Joseph Menn; Editing by Lisa Shumaker)
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