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 ?
This glow shone out in her exquisite, truly enigmatic eyes.
It remained to baffle him, that enigmatic statement of hers that she could more easily have married the Elam Harnish fresh from the Klondike than the present Elam Harnish.
This stupid repetition was too incongruous in its ineptitude with the serious, brooding and enigmatic glance he turned upon his visitor.
He had simply babbled on uttering empty phrases, letting slip a few enigmatic words and again reverting to incoherence.
For that sort of inertia in woman is always enigmatic and therefore menacing.
It was the sheet upon which I had scrawled the enigmatic message.
Our lady readers will pardon us if we pause for a moment to seek what could have been the thought concealed beneath those enigmatic words of the archdeacon: "This will kill that.
He began by taking charge of certain delicate missions which can be given neither to a man who respects himself nor to a man who does not respect himself, but are confided to grave and enigmatic individuals who can be acknowledged or disavowed at will.
At work, Henry is drawn to the enigmatic Freddie, while Lance greets newcomer Daniel, but both friendships are set on a course to explode.
Freakish deaths start occurring as the enigmatic Ernessa seems intent on wiping out certain groups of her fellow students.
Meaning "ambitious or enigmatic", Delphic like to keep their fans guessing.
Describing her role of Severine, Berenice says that she was described by the writers and director as glamorous and enigmatic. "For me," she says, "enigmatic is very important because I wanted to create a character who couldn't be stereotyped.