Following the public interest created by the movie The Imitation Game, starring Benedict Cumberbatch and Keira Knightley, FA publications was approached to create a full photorealistic simulation of the M4 version of the Enigma encryption machine of the type used by the Kriegsmarine submarine wolf pack in World War II. It is this machine that produced the Shark encrypted messages that were broken by the codebreakers at Bletchley Park.

 

Click on the ENIGMA button below if you want to learn more about this machine and to have a go at enciphering and deciphering your own messages.