World’s First Covert Communications System with Camouflage Guaranteed

Sometimes encrypting messages isn’t enough, and the very act of sending them must be hidden as well. Now physicists have discovered how to camouflage messages and guarantee that they remain hidden.

The world of cryptography has undergone a quiet revolution in recent years. That’s largely because of the advent of techniques that exploit the laws of quantum mechanics to send messages with perfect privacy. So-called quantum cryptography ensures that an eavesdropper cannot decode a message under guarantee by the laws of physics.

But sometimes perfect privacy isn’t enough. Sometimes the knowledge that a message has been sent is all that an adversary needs. So the question arises of how to hide a message so that an eavesdropper cannot tell whether it has been sent or not.

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