Solving a Mystery From the Thirty Years'War: Karel Rabenhaupt ze Such'e's Encrypted Letter to Landgravine Amalie Elisabeth. - Eugen Antal; Pavol Zajac; Jakub Mírka (HistoCrypt, 2021)

Wrong Design of Cipher Keys: Analysis of Historical Cipher Keys From the Hessisches Staatsarchiv Marburg Used in the Thirty Years' War. - Eugen Antal; Jakub Mírka (HistoCrypt, 2022)