10-09-2026, 03:02 PM
(10-09-2026, 12:42 PM)Mauro wrote: You are not allowed to view links. Register or Login to view.Strictly, this is not correct. Ie. with a You are not allowed to view links. Register or Login to view. cipher the cyphertext contains zero information, yet the full message can be recovered (in this case, all the information is in the key).
Fair correction, and I'll restate it: the relation is plaintext–ciphertext–key, not the ciphertext alone.
But I think that sharpens the point rather than blunting it. A OTP ciphertext is maximally high-entropy — uniform, h2 equal to h1, no positional structure. Voynichese is anomalously low on all three. So the one architecture that genuinely puts most information in the key produces exactly the profile Voynichese doesn't have. The key is also message-length, and neither half is readable alone.
Which is worth restating generally: the information has to be somewhere, and every place you can put it has a measurable cost. In the ciphertext, it raises entropy. In the key, it makes the text unrecoverable in principle.

