Eugen Antal: The origin of military cryptanalysis in Czechoslovakia
Abstrakt: Josef Růžek was one of the best cryptography and cryptanalysis specialists in Czechoslovakia. In addition to his various achievements in cryptanalysis, he was involved in building the encryption service and training new experts in cryptanalysis in Czechoslovakia. We present detailed information on the origin of cryptanalysis in Czechoslovakia based on documents from Czech and Slovak archives. We mainly focus on the written courses of cryptanalysis organized by Růžek and on the first Czechoslovak manual of cryptanalysis.