The Rabenhaupt cipher (1646), which has resisted codebreakning efforts for some years, was finally solved by finding the key in the archives. The result is now published by a paper of Eugen Antal, Pavol Zajac, Jakub Mírka in HistoCrypt 2021. See "Some German Ciphers: 1540-1815".
The same proceedings also include a report of a preliminary decipherment of letters to Emperor Maximilian II (1574, 1575) by Nils Kopal, Michelle Waldispühl ("Habsburg Codes and Ciphers") as well as other interesting findings mentioned yesterday and the day before yesterday and more.
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