After busting the Hebern machine, William moved on to the next supposedly unbreakable device, invented in 1924 by a German named Alexander von Kryha, who committed suicide in 1955. The Kryha cipher machine was shaped like a half-moon and contained two discs of alphabets, one a fixed semicircle, the second a circle that rotated against it. According to the inventor, it could encipher a message in 2.29 x 1082 ways, a number larger than the number of atoms in the observable universe. William was not impressed: “The number
