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If it turns out that advanced civilizations place a premium on private, encrypted communications and this is why we didn’t detect any yet, it’ll make cryptography the most important discipline in the history of humanity

@szbalint Also take note of our switch from analog to digital radio, which uses spectrum more efficiently at the cost of legibility to an outside party who doesn't know the codecs. Spectrum is limited, and efficient use of it leads to communications looking more and more like static.

(Also, non-directional broadcast media could very well peter out, for that matter.)

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