Diplomatic Ciphers Used by Slovak Attaché During the WW2

Abstract

Slovakia was an allied (puppet) state of Germany during WW2. In various Slovak and Czech archives, we found previously unknown details about diplomatic ciphers used by the Ministry of Foreign Affairs during WW2 in Slovakia. Here we present cipher systems used by Slovak Attaché and give insight into the encryption problems of the Ministry and embassies. 1 The Slovak State name was officially used between March 14 and July 21, 1939. In July 21, 1939 the Slovak State was declared as a republic and renamed to Slovak Republic. The Slovakia acronym was also in use.2 Overview of the Slovak military ciphers used during the WW2 can be found in (Antal et al., 2019).