Four Rotor Enigma machine, Germany, 1943-1944
The Enigma encryption machine was supposed to be uncrackable. It wasn’t—but the Germans didn’t know that. In 1942, unaware the British had already broken Enigma, they added a fourth rotor to make it harder to crack. This rare machine was made for Japan, Germany’s ally. Piece it together and see if you can spot the Japanese characters.