Flaw in the Enigma Code - Numberphile
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Numberphile's Dr James Grime explains the flaw in the Enigma machine, namely that a letter could never be encrypted to itself, and how that helped the Allies break the code. It touches on the Bombe and Alan Turing.
HN 推荐的原因： HN points to it as a short, clear explanation of why Enigma was breakable and how search-space elimination works.
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