[Movie] This Famous Medieval Book May Be a Hoax

[oshfdk]

If I encode a character using the combination of the word length and the second character in the word (say, qOkedy is O-6 or S, cHedy is H-5 or A, oTey is T-4 or Y, pOchey is O-6 or S again), this is non-deterministic, but perfectly reversible. 

Hmm sorry but I don't understand. It seems to me your encoding method is deterministic (no random numbers are involved) but non-reversible (is O-6 'qokedy' or 'qokain'?)

It's non deterministic because you can freely choose any word as long as the second letter is the one you need, and the whole word is of the required length. It's reversible, because the plaintext letter is uniquely determined by the word length and the second letter of the word.

   

(Just an example, has nothing to do with the Voynich MS, as far as I know.)