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[[Image:Nsa-enigma.jpg|right|thumb|200px|A German-built Enigma machine.]]
The '''Enigma''' was a portable cipher machine, roughly the size of a typewriter, which could encrypt and decrypt secret messages. It used electro-mechanical rotors to convert a message to a secret code, and then another machine could decode that same message and print out the original message. This machine was commercially available beginning in the early 1920s. The Nazi German military version generated codes widely thought to be unbreakable.
The '''Enigma''' was a portable cipher machine, roughly the size of a typewriter, which could encrypt and decrypt secret messages. It used electro-mechanical rotors to convert a message to a secret code, and then another machine could decode that same message and print out the original message. This machine was commercially available beginning in the early 1920s. The Nazi German military version generated codes widely thought to be unbreakable.