As for the uncertain cipher, I would assume that for the relevant time frame a not so simple substitution ( see following description ) is a possibility. Assuming Latin, one could take repeating letter pairs (A-B-A) as crib, search for them in a comparative text ( here regimen sanitatis ) and check if such pairs occur in whole words in the VMS ( e.g. "SHEDY QOKEDY SHEDY" <> "ti-ga-ti" ). From this, one could derive a word or series of words in the best case.
Even if my attempt from 2018 was not successful, I think the method is promising.
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edit: Of course, I am not 100% sure if such a " decomposition " of words was even conceivable at the given time frame.
Even if my attempt from 2018 was not successful, I think the method is promising.
see: You are not allowed to view links. Register or Login to view.
edit: Of course, I am not 100% sure if such a " decomposition " of words was even conceivable at the given time frame.