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While the defense [link url=https://venturebeat.com/2017/03/21/drone-hunting-machines-aim-to-counter-aerial-threats/ target=_blank]against drones[/link] is increasingly gaining in importance, drones also have to be immunized against hacker attacks. MIT has now equipped a swarm of drones communicating with each other with a digital fingerprint. Since the transmitted signals also interact with the environment, these “echos” could be used as a signature. No chance to hack into the swarm intelligence.