(19-07-2021, 03:20 PM)Mark Knowles wrote: You are not allowed to view links. Register or Login to view.What do you mean by "known methods"?
(19-07-2021, 03:20 PM)Mark Knowles wrote: You are not allowed to view links. Register or Login to view.What do you mean by "simple substitution"?
I refer to the paper of @Nickpelling ( see above ) respectively to the presented ciphers of Simeone de Crema and Michele Steno. As I see it, these are ciphers that essentially simply perform a letter substitution in the alphabet.
(19-07-2021, 03:20 PM)Mark Knowles wrote: You are not allowed to view links. Register or Login to view.It is interesting that you bring up Ramon Llull. His work is certainly an interesting line of inquiry, though it is hard to see how it could be a precursor to the Voynich cipher.
I would not call Llull`s work a precursor. I am more interested in the fact that he developed a method with which one can form meaningful sentences according to a logical system. I think it is quite possible that the VMS contains a text created in a similar way. To encrypt the whole thing would be the next step and the innovative thing. It is conceivable that fixed terms were encoded individually and then used.
Somehow, then, plenty of additional "filler" would have to be built in.