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The Enigma machines were a series of electro-mechanical rotor cipher machines developed and used in the early- to mid-twentieth century to protect commercial, diplomatic and military communication.
Enigma was invented by the German engineer Arthur Scherbius at the end of World War I.
Now, some women like big hands and some like small things.The French had a spy with access to German cipher materials that included the daily keys used in September and October 1932. The French gave the material to the Poles, and Rejewski used some of that material and the message traffic in September and October to solve for the unknown rotor wiring.Consequently, the Poles were able to build their own Enigma machines, which were called Enigma doubles.Over time, the German cryptographic procedures improved, and the Cipher Bureau developed techniques and designed mechanical devices to continue breaking the Enigma traffic.As part of that effort, the Poles exploited quirks of the rotors, compiled catalogs, built a cyclometer to help make a catalog with 100,000 entries, made Zygalski sheets and built the electro-mechanical cryptologic bomb to search for rotor settings.