Lorenz Cipher

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The Toughest Code WW2 Code Was Lorenz Cipher, Not Enigma - Front > .

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When it came to sending top-secret messages, Hitler didn't bother with the Enigma cipher. He used the supposedly unbreakable Lorenz cipher. It was broken within four years by a crack team of genuine geniuses.

GCHQ, GC&CS, Ultra ..