What exactly did an Enigma machine do, and why did it seem so secure? Following a live pre-show demonstration of a Swiss-made, postwar Enigma machine, this conversation turns inward to the mechanics, logic, and wartime significance of one of the twentieth century’s most famous encryption devices. By looking at both the machine itself and the challenge of breaking the code it produced, enter into the world Turing was working in, and the technical problem that helped define his era.