Enigma machine

Noun

 * 1)  A small portable electro-mechanical rotor machine used to encrypt and decrypt secret messages, made famous by Germany in WWII.
 * 2)  Something which decrypts or makes understandable something enigmatic.
 * 3) * 2004, New Yorker, 9 - 16 August 2004, page 37:
 * No one needed an Enigma machine to figure out why Jimmy Carter was recalling his days aboard a nuclear submarine.