Re-creation of 'Colosus' code-breaking computer, Bletchley Park, 1997.
© Science Museum / Science & Society Picture Library
'Colosus' was the world's first electronic programmable computer. Bletchley Park was the British forces' intelligence centre during World War II, where cryptographers deciphered top-secret military communiques between Hitler and his armed forces. The communiques were encrypted in the Lorenz code which the Germans considered unbreakable. The codebreakers at Bletchley cracked the code with the help of Colosus, and so aided the Allies victory.