Re-creation of the Colossus computer at

UNITED KINGDOM - MARCH 25: Re-creation of the 'Colossus' computer at Bletchley Park, 1997. This shows the circuitry and pulley-wheel system of the Colossus computer at Bletchley Park in Buckinghamshire. Bletchley Park was the British forces' intelligence centre during WWII, and is 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, but the codebreakers at Bletchley cracked the code with the help of Colossus. (Photo by SSPL/Getty Images)