This is one of thousands of Enigma machines used during World War II by German forces to encrypt secret radio communications. The Germans believed the encrypted messages created by Enigma were indecipherable. A large team of workers, based at Bletchley Park in Buckinghamshire, succeeded in developing techniques that allowed the German codes to be deciphered. The Enigma machine provides an exciting starting point for several enquiries including the role of code breaking in the conduct of the war, the contribution made by women to the war effort and the development of the digital age.