The Internet of Things has introduced security issues to hundreds of devices that previously were off-limits to hackers, turning innocuous appliances like refrigerators and toasters into gateways for data theft and spying. But most alarmingly, the Internet of Things has created a whole new set of security vulnerabilities with life-threatening risks. We’re talking about the cars and, particularly, medical devices that are now in the sights of hackers—including drug infusion pumps, pacemakers, and other critical hospital equipment.