(06-01-2026, 04:33 PM)eggyk wrote: You are not allowed to view links. Register or Login to view.h2 appears to decrease with the cipher applied, not increase. This is also using a simple abc =1, def = 2 system. I would expect that by shuffling these letters around in their groups you could reduce entropy further.
There is a trade-off between reducing the number of possible follow-up characters because of the smaller character set and increasing the number of follow-up characters by merging the possibilities of several polyphones. (It's not the number of possibilities, it's their frequencies that matter actually.)
Reducing the character set decreases h0 = log2(number of characters) and then you have always h0 >= h1 >= h2 so making h0 low enough will force h2 as low as you want. But then you are no longer compatible with Voynichese, that uses ~20 characters.