The scene from the Showtime series Homeland is tough to watch: The Vice President of the United States, dying slowly as his heart beats faster. His pacemaker – a delicate implanted device, accessed and altered from some distant computer by a terrorist who'd learned its serial number – is going haywire.

It could happen, said Tim Zoph, CIO of Chicago's Northwestern Memorial Hospital, speaking at the Healthcare IT News/HIMSS Media Privacy & Security Forum this past December.

Big data:

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