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    The first page of al-Kindi's manuscript "On Deciphering Cryptographic Messages", containing the oldest known description of cryptanalysis by frequency analysis.

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    current11:34, 20 April 2005Thumbnail for version as of 11:34, 20 April 2005327 × 328 (42 KB)Sador~commonswikiThe first page of al-Kindi's manuscript "On Deciphering Cryptographic Messages", containing the oldest known description of cryptanalysis by frequency analysis. {{PD}}

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