Tommy Flowers developed Colossus in 1943. This computer was intended to aid British code breakers in World War II with analysis of the Lorenz cipher.

The Lorenz cipher was developed by C. Lorenz AG company in Berlin. The exact employees responsible for it are unknown. It was implemented in four variants in different machines known as SZ40, SZ42, SZ42A and SZ42B and introduced in 1940 and 1942 respectively.

The British cryptanalysts at Bletchley Park referred to the Lorenz cipher as Tunny and broke it by various hand methods (but too late to be of military value) until the first of 10 Colossus programmable electronic digital computers ran in 1944 (the first militarily useful message broke by the Colossus was on June 5, 1944 reporting that the Panzers were being ordered to leave Normandy and go north to Calais, clearing the way for D-Day on June 6, 1944 without having to worry about any Panzers for long enough to capture the beaches and have moved well inland).

Tony Sale has written:

'The Colossus computer, 1943-1996' -- subject(s): Electronic intelligence, Lorenz cipher system, World War, 1939-1945

Lorenz Lorenz has written:

'Die Nacht des Fehlers'

Turing did not work on the Enigma, it was a German machine.

However he did do some work on the British Bombe machines that were used to crack the Enigma machine cipher.

Later he saw Tommy Flowers' Colossus electronic computer, designed to crack the German Lorenz SZ40/42 machine cipher. This inspired him after the end of the war to begin work on programmable electronic computers.