Positional Mimic Cipher (PM-Cipher)

[quimqu]

I generally find this type of experimentation interesting but:

H₂≈2.80

this is still quite high, especially for an Eva-like representation.

Thank you, René, you are right. 

The H₂ in my post is a bit high, but that’s easy to fix because the system is fully parameterizable.

In practice I just tighten per-position alphabets to reduce next-symbol options; this directly lowers H₂. Then I run a targeted H₂ pass that collapses only the positions contributing most to conditional entropy. And finally I do a light bigram touch-up so correlations/JS and the Zipf curve stay on track.

With those knobs, pushing H₂ down toward 2.3 is straightforward while keeping token lengths and overall grapheme/bigram shape aligned with Voynich. Here some plots:



Example of cipher and residuals:

Latin: Auferre, trucidare, rapere falsis nominibus res publica, atque ubi solitudinem faciunt, pacem appellant
PM-ciphered: aediddi qotarynydy chelidy qoedlyd qoorelyrir chol cheldyny akqoi ate chodenydylyn qoedeynn chedin aklinnyln
Residuals: 2 2 4 0 0 1 0 | 0 1 1 1 0 5 1 2 1 | 1 1 2 0 0 1 | 7 1 2 0 0 0 | 1 1 1 0 0 0 3 1 0 | 1 0 0 | 3 2 3 2 0 3 1 | 2 0 0 0 | 3 3 0 | 0 1 2 0 0 3 2 0 0 1 1 | 7 1 1 0 1 1 0 | 3 1 1 0 2 | 2 2 2 0 3 4 1 0 0

And here is the new conversion table in case you wan to have some fun!