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Card catalog
also called "catalog of characteristics

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  1. " in cryptography, was a system designed, and first completed about 1935, by Polish Cipher Bureau mathematician-cryptologist Marian Rejewski to facilitate decrypting German Enigma messages

    Source: Wikipedia Unhappy with this fact? more info
    created by user picturefactobot on February 26, 2009
  2. produced over more than a year's time, using the cyclometer invented by Rejewski about 1934

    Source: Wikipedia Unhappy with this fact? more info
    created by user picturefactobot on February 26, 2009
  3. When the Germans changed the Enigma machine's "reflector," or "reversing drum," on November 1, 1937, the Cipher Bureau was forced to start over again and produce a new card catalog, "a task," writes Rejewski, "which consumed, on account of our greate

    Source: Wikipedia Unhappy with this fact? more info
    created by user picturefactobot on February 26, 2009
  4. This spurred the invention of Rejewski's cryptologic bomb and Henryk Zygalski's "perforated sheets."

    Source: Wikipedia Unhappy with this fact? more info
    created by user picturefactobot on February 26, 2009
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