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How did the Enigma machine work?

Used during WWII to encrypt messages, the Enigma Machine played a significant role in wartime communications. This video ...
PBS

Breaking Enigma: A World War II Game Changer

The story of breaking the unbreakable German Enigma Code by Alan Turing during WWII. Narrated by Keith Morrison of "Dateline," the breaking of Germany's top-secret Enigma Code at Bletchley Park in the ...