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Steganography. With a good key and enough stuffing, it is undetectable

If they're scrutinizing you closely, I would not trust my life to it. If the hash of the cat gifs you're exchanging is different from others, eventually there's going to be too much or too little entropy in those pixels and they'll make a strong statistical case against you.

Do you mean steganography? Stenography is writing in shorthand (or typing on a stenotype, like court reporters do).

autocorrect strikes again :)

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