The incompatibility of Voynichese with natural human language

[voynichbombe]

On the original topic of this thread, I can only pose this rhetorical question: is the Voynich text compatible with a medieval cipher?

This is a good (rhetorical) question. As far as I know, before Alberti there were only rudimentary approaches ( simple substitution ) and even an Alberti-like code would probably have been decoded already. So one can only assume that, if there is an encryption, it is based on a completely unknown,  unique system. This would not surprise me. So the question is what non-anachronistic method(s) would be possible.

I beg to slightly differ. We have two, and probably more, wundervolle (sorry for code-switching) threads on this board:

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I think that my argumentation was not understood, back then. I recounted from the books written by Al-Kindi (9th CC) & Al-Khalil (8th CC) about cryptanalysis - I don't think we should rely on the date of the Alberti publication for knowledge about this: super ciphers. My point then was, that staging multiple weak ciphers results in a super cipher, which is much, much more time consuming to solve. Modern cryptography does very much the same, to make it computationally very expensive to solve.

Let's suppose:

1) For the clear text we use code switching, changing languages insides sentences by a pattern defined by us. Or we write backwards, as it pleases us.

2) We encode bigraphs (graphemes that are represented by two or more (e.g. tri-) graphs like german ch or sch) by a pattern. Here we can use m:m relations, because the number of said graphemes is small.

3) We apply a substitution cipher

4) We apply a transposition cipher

5) We add nulls as fillers and use arbitrary spaces

6) - or where it may come in handy, we invent a writing system

This will be very hard to break, and the knowledge of all of it could very well have been available during the given timeframe.

What we very well can expect, and here I make a prediction, are errors in the encipherment. This is true even for the Copiale Cipher.. but this will not hinder us to understand the message, if:

We keep note of the patterns and stages.

Back then, I did an exemplary multi-stage enciphering using You are not allowed to view links. Register or Login to view.

The enciphered message is this: thAt6ShOUld-bW5fUNkOmmA*5tOoaUSRufMzei>?9 . Who can solve this quickly, is almost certainly a wizard.

Because, my problem is the following, and this is true, because I did it on the fly: I forgot to take note about the stages I used, and the order of them. As far as I can remember I did not use nulls. So I cannot simply reverse this, without correctly guessing the last stage.