Nils Kopal, Michelle Waldispühl. Two Encrypted Diplomatic Letters Sent by Jan Chodkiewicz to Emperor Maximilian II in 1574-1575. In Carola Dahlke, editor, Proceedings of the 4th International Conference on Historical Cryptology, HistoCrypt 2021, Amsterdam, The Netherlands, postponed to June 20-22, 2022. Volume 183 of Linköping Electronic Conference Proceedings, pages 80-89, Linköping University Electronic Press, 2021. [doi]
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