Monday, February 2, 2026

Update 2026

This year I’ve added a new essay on the Compromise of Polish codes in WWII. This is a summary of the work done on Polish codes and ciphers (diplomatic, intelligence service, resistance movement) by the codebreakers of Germany, the United States and Britain.

I uploaded the file TICOM report D-3 ‘The Polish Cyphers for Diplomatic and Consular Traffic’ by Scherschmidt (1943)

I’ve also added information and rewritten parts of the essay Intercepted conversations - Bell Labs A-3 Speech scrambler and German codebreakers. Specifically, I added a new section on the transoceanic radiotelephone service operated by AT&T from 1927 up to the 1950’s.

The compromise of Polish diplomatic, intelligence service and resistance movement communications 1930’s-1945

 In WWII Poland fought on the side of the Allies and suffered for it since it was the first country occupied by Nazi Germany. In the period 1940-45 the Polish Government in Exile and its military forces contributed to the Allied cause by taking part in multiple campaigns of war. Polish pilots fought for the RAF during the Battle of Britain, Polish troops fought in N.Africa, Italy and Western Europe and the Polish intelligence service operated in occupied Europe and even had agents inside the German High Command.

Although it is not widely known the Polish intelligence service had spy networks operating throughout Europe and the Middle East. The Poles established their own spy networks and also cooperated with foreign agencies such as Britain’s Secret Intelligence Service and Special Operations Executive, the American Office of Strategic Services and even the Japanese intelligence service. During the war the Poles supplied roughly 80.000 reports to the British intelligence services (1), including information on the German V-weapons (V-1 cruise missile and V-2 rocket) and reports from the German High Command (though the agent ‘Knopf’) (2).

The activities of the Polish government departments and intelligence agencies attracted the attention of both Germany and the USA and UK and their codebreakers were able to solve most of the Polish cipher systems.