Cryptography is an arms race. As computing power scales up so do encryption techniques. As long as encrypted internet traffic is possible you cannot shut down the free exchange of information.
Now, if you go further and say no data packets shall be allowed that are encrypted, well, my arms escalation analogy says go look up steganography and be prepared to admit defeat. You think a book can't be encrypted into a "legit" digital video signal? Guess again.
You can't stop the signal.
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