Enigma

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Enigma

(hardware, cryptography)
The electro-mechanical cipher engine used by the Germans in World War II. Many of their messages were deciphered at Bletchley Park, by Alan Turing and others.
References in classic literature ?
While she had been speaking he had wandered on the track of the enigma, out of the world of senses into the region of feeling.
Levin tried through her to get a solution of the weighty enigma her husband presented to his mind; but he had not complete freedom of ideas, because he was in an agony of embarrassment.
The baffling enigma of the Chinese character to the West was no baffling enigma to the Japanese.
Pearl's inevitable tendency to hover about the enigma of the scarlet letter seemed an innate quality of her being.
He walked the floor for half an hour puzzling over his enigma, then he hunted out the other glass plates.
But his thoughts seemed to stumble in the darkness of some not-solved enigma, and soon he fell silent.
Beloved by one, a sort of instinctive and savage half-man, for its beauty, for its stature, for the harmonies which emanated from its magnificent ensemble; beloved by the other, a learned and passionate imagination, for its myth, for the sense which it contains, for the symbolism scattered beneath the sculptures of its front,--like the first text underneath the second in a palimpsest,--in a word, for the enigma which it is eternally propounding to the understanding.
Heaven knows, unless it is that the persistent clicking of that unfathomable enigma out there in the vast silences of the Sahara has so wrought upon my nerves that reason refuses longer to function sanely.
I think Daddy Jacques did wrong to leave behind him the weapon with which the crime was committed and, as he occupied the attic immediately above Mademoiselle Stangerson's room, the builder's job ordered by the examining magistrate will give us the key of the enigma and it will not be long before we learn by what natural trap, or by what secret door, the old fellow was able to slip in and out, and return immediately to the laboratory to Monsieur Stangerson, without his absence being noticed.
For one thing, it contains twelve answers, whereas there were only six enigmas presented in the 1782 almanac.
Enigmas and Riddles in Literature is ingeniously organized to make its array of materials most engaging and useful.
Enrique Martinez-Lopez, who rediscovered Sor Juana's Enigmas after they had been lost for almost three centuries.