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[davidjackson]

Raphael Mnisovsky was very familiar with Trithemian cryptography and even wrote a Czech translation of Polygraphia. In his letter to Marci, he posits the author may have been Roger Bacon. (The earliest such reference to Bacon) If a period expert on the subject didn't recognize it as such, then it's probably safe to infer that it's not Trithemian (or Paracelsian by extension).     

Mnišovský never wrote a letter to Marci (that has been preserved). Instead, what we have are Marci's remarks upon what Mnišovský verbally told him. It was Marci who, tangentially, thought it could have been a work of Bacon.
Nor did he write a Czech translation of Polygraphia - he wrote a version of Polygraphia adapted for the Czech language, which isn't quite the same thing. (Uppsala University library MS Slav. 60)