Network Front | The Guardian: How did the Enigma machine work?

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How did the Enigma machine work?
Nov 14th 2014, 16:23, by Alex Hern

On the day The Imitation Game hits cinemas, a look at how Allied codebreakers untangled the Enigma

Like all the best cryptography, the Enigma machine is simple to describe, but infuriating to break.

Straddling the border between mechanical and electrical, Enigma looked from the outside like an oversize typewriter. Enter the first letter of your message on the keyboard and a letter lights up showing what it has replaced within the encrypted message. At the other end, the process is the same: type in the ciphertext and the letters which light are the decoded missive.

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