British intelligence breaks German "Enigma" key used on the Eastern Front | June 27, 1941 |...

On June 27, 1941, British cryptologists help break the secret code used by the German army to direct its strategic military operations on the Eastern front in the Soviet Union.

British and Polish experts had already broken many of the Enigma codes for the Western front. Enigma was the Germans’ most sophisticated coding machine, necessary to secretly transmit information. The Enigma machine, invented in 1918 by Arthur Scherbius looked like a typewriter and was originally employed for business purposes. The German army adapted the machine for wartime use and considered its encoding system unbreakable. They were wrong.