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| Topic: |
Technology
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| Number of pages / Number of words: |
7 / 1837 |
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These types of ciphers are still used today mostly in puzzles. Practically all ciphers remained vulnerable to this type of attack until Leon Battista Alberti invented the polyalphabetic cipher around the year 1467. His innovation used different ciphers for varying parts of a message. He invented the first automatic cipher device, a wheel which switch alphabets after several words...
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He invented the first automatic cipher device, a wheel which switch alphabets after several words. The polyalphabetic Vigenere cipher uses a key word in controlling letter substitution based on which letter of the key word is used. [2] Though an improvement, ciphers were still partially vulnerable to frequency analysis techniques...
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