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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 reveal 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 reveal 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 machine was an electromechanical device, equipped with a 26-letter keyboard, with one light per letter of the alphabet. Inside the machine was a set of wired drums for scrambling the input.  To encipher or encrypt a letter, the operator pushed the relevant key and observed which of the lights lit.  The communication between two operators required that each had an Enigma machine set up in the same way as each other.  The large number of possibilities for setting the rotors (and a plugboard that could swap letters) made for an astronomical number of possible configurations, each producing a different cipher.  The Germans changed the settings daily, such that the machine had to be re-broken each day in order to decrypt the messages.  

The Enigma machine was an electromechanical device, equipped with a 26-letter keyboard, with one light per letter of the alphabet. Inside the machine was a set of wired drums for scrambling the input.  To encipher or encrypt a letter, the operator pushed the relevant key and observed which of the lights lit.  The communication between two operators required that each had an Enigma machine set up in the same way as each other.  The large number of possibilities for setting the rotors (and a plugboard that could swap letters) made for an astronomical number of possible configurations, each producing a different cipher.  The Germans changed the settings daily, such that the code had to be re-broken each day in order to decrypt the messages.  

For others to break (decrypt) the code, they had to figure out how the Enigma functioned, the wiring of its rotors and its daily settings (both rotors and plugboard).  

For others to break (decrypt) the code, they had to figure out how the Enigma functioned, the wiring of its rotors and its daily settings (both rotors and plugboard).