Life-saving pacemakers manufactured by Medtronic don’t rely on encryption to safeguard firmware updates, a failing that makes it possible for hackers to remotely install malicious wares that threaten patients’ lives, security researchers said Thursday. At the Black Hat security conference in Las Vegas, researchers Billy Rios and Jonathan Butts said they first alerted medical device maker Medtronic to the hacking vulnerabilities in January 2017.

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