The Enigma machine, first patented in 1919, was after various improvements adopted by the German Navy in 1926, the Army in 1928, and the Air Force in 1935. It was also used by the Abwehr ...

(SSPL/Getty Images) Peter Westcombe, founder of the Bletchley Park Trust, explains in detail how the Enigma machine works and how its codes were broken by the code-breakers at Bletchley Park.