Mayhem emerged from a 2016 government-sponsored contest at a Las Vegas casino hotel. Now it’s used by the military.
LATE LAST YEAR, David Haynes, a security engineer at the internet infrastructure company Cloudflare, found himself gazing at a strange image. “It was pure gibberish,” he says. “A whole bunch of gray and black pixels, made by a machine.” He declined to share the image, saying it would be a security risk