In mid-1931, at the Polish General Staff, a Cipher Bureau was formed by merging the Radio-Intelligence Office (Referat Radiowywiadu) and the Polish-Cryptography Office (Referat Szyfrów Własnych) [REF].
Between 1932 and 1936, the Cipher Bureau took on additional responsibilities, including radio communications between military-intelligence posts in Poland and abroad, as well as radio counterintelligence - mobile direction-finding and intercept stations for the locating and traffic-analysis of spy and fifth-column transmitters operating in Poland [REF].