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.
This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)
References in classic literature ?
He hath subdued monsters, he hath solved enigmas. But he should also redeem his monsters and enigmas; into heavenly children should he transform them.
But my mind had been running on Grace Poole--that living enigma, that mystery of mysteries, as I considered her.
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.
How are we to explain this enigma? These islanders were heathens!
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.
But Brissenden was always an enigma. With the face of an ascetic, he was, in all the failing blood of him, a frank voluptuary.