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Almost Perfect Cipher System

Even when It is known to be in use the Playfair code is most difficult to unravel

April 1 1936 F. GREGORY HARTSWICK
Almost Perfect Cipher System View Article Pages
ARTICLE
Almost Perfect Cipher System

Even when It is known to be in use the Playfair code is most difficult to unravel

April 1 1936 F. GREGORY HARTSWICK

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F. GREGORY HARTSWICK

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