I made several additions to "French Ciphers during the Reign of Louis XIII", of which one undeciphered item (Coquet's) has also been included in "Unsolved Historical Ciphers".
Apart from specific ciphers, an observation by Desenclos (2017) that the cipher (1612) of Sainte-Catherine, resident in the Palatinate, was based on a cipher (1589) for Guillaume Ancel, resident to the Emperor, was interesting for me.
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