KONA 4 (Kommandeur der Nachrichtenaufklärung - Signals Intelligence Regiment) had fixed and mobile units intercepting and decoding traffic from the Balkans and the Middle East. Specifically British, French, Turkish, Bulgarian and resistance movements communications. Yugoslav communications were also worked on by small detachment under Lieutenant Wollny (Nachrichten Aufklärung Zug ‘W’) based in Belgrade.
4th quarter ’44: 776 messages and 99 advance reports issued (S-Meldungen/Sofortmeldungen).
Special traffic Mihailovic-Yugoslav government in Exile
The British authorities kept in contact with Tito and Mihailović through liaison officers sent by the intelligence services SIS and SOE. These small teams transmitted traffic by radio to their controlling stations in Cairo, Egypt and Bari, Italy. The cryptosystems used were double transposition and the War Office Cypher, enciphered with one time pads.
Acknowledgements: I have to thank Ralph Erskine for information on the British exploitation of Partisan and Chetnik codes and Randy Rezabek for the reports of KONA 4.
Additional information: For more information on the use of signals intelligence by the Germans check the articles ‘The Key to the Balkans: The Battle for Serbia 1944’ and ‘The German ‘ultra’: signals intelligence in Yugoslavia 1943–1944’ by Gaj Trifković.