Xenocryption

Are the aliens hidden by advanced cryptography?

“If you look at encrypted communication, if they are properly encrypted, there is no real way to tell that they are encrypted,” Snowden said. “You can’t distinguish a properly encrypted communication from random behavior.”

(This doesn’t address the question of how an alien culture would be able to encrypt its material civilization — or cosmic matter-energy process — but that’s also a suggestive question.)

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