I solved both Trithemius's cipher and Heidel's encrypted solution in 1993 and published amonograph on the subject in 1996. In addition to drawing on my previous research, the following article includes several new observations and references, especially with regard to the chronology of the work, additional manuscript copies of theSteganographia, and the position of the Third Book within Trithemius's complete cryptological oeuvre.
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