CHAPTER 6
THE EMERGENCE OF CIPHER MACHINES
THE ROTOR, a new mechanical implementation of polyalphabetic encipherment, was introduced at the start of the twentieth century. We examine encipherment by mechanical cipher machines and an important characteristic used in their cryptanalysis. Edward Hebern's Electric Coding Machine, patented in 1924, directly stimulated American cryptographic design. A description of the Enigma machine and a description and cryptanalysis of the Lorentz Schlusselzusatz concludes the chapter.
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