"Oops, your files have been encrypted!" This was the chilling message that greeted hundreds of thousands of computer users last summer. The WannaCry ransomware attack brought production to a standstill at Renault factories across France, put lives at risk by attacking hospitals in the UK, and cost companies around the world billions of dollars in lost revenue. WIRED OPINION ABOUT Jens Stoltenberg (@jensstoltenberg) is NATO secretary general and the former prime minister of Norway.

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