A letter from Danzay, French ambassador to Denmark, to Henry III (1574) includes a undeciphered paragraph, which has been on my list of unsolved ciphers here. It may have been too short to solve analytically, but Sergey Ryabov succeeded in reconstructing the cipher by finding another letter (1578) with decipherment in the margin. Now I updated the record.
To me, Danzay is interesting because of his unparallelled long tenure from 1548 to 1589. Comparison of ciphers used during his career may shed light on practices of French cryptography at the time. For the time, I found one from 1557.
I uploaded a new article "Danzay's Ciphers: Ciphers of a French Diplomat with a Long Tenure" to report Danzay's ciphers from 1574-1578 and 1557.
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