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The Vigenère cipher ( French pronunciation: [viʒnɛːʁ]) is a method of encrypting alphabetic text where each letter of the plaintext is encoded with a different Caesar cipher, whose increment is determined by the corresponding letter of another text, the key . For example, if the plaintext is attacking tonight and the key is ...
Polyalphabetic cipher. A polyalphabetic cipher is a substitution, using multiple substitution alphabets. The Vigenère cipher is probably the best-known example of a polyalphabetic cipher, though it is a simplified special case. The Enigma machine is more complex but is still fundamentally a polyalphabetic substitution cipher.
Giovan Battista Bellaso. Giovan Battista Bellaso (Brescia 1505–...) was an Italian cryptologist . La cifra ("The Cipher"), 1553. The Vigenère cipher is named after Blaise de Vigenère, although Giovan Battista Bellaso had invented it before Vigenère described his autokey cipher .
Kasiski examination. In cryptanalysis, Kasiski examination (also known as Kasiski's test or Kasiski's method) is a method of attacking polyalphabetic substitution ciphers, such as the Vigenère cipher. [1] [2] It was first published by Friedrich Kasiski in 1863, [3] but seems to have been independently discovered by Charles Babbage as early as ...
Paris, Kingdom of France. Nationality. French. Occupation (s) diplomat, cryptographer, alchemist. Blaise de Vigenère (5 April 1523 – 19 February 1596) [1] ( French pronunciation: [viʒnɛːʁ]) was a French diplomat, cryptographer, translator and alchemist .
Unicity distance. In cryptography, unicity distance is the length of an original ciphertext needed to break the cipher by reducing the number of possible spurious keys to zero in a brute force attack. That is, after trying every possible key, there should be just one decipherment that makes sense, i.e. expected amount of ciphertext needed to ...
Index of coincidence. In cryptography, coincidence counting is the technique (invented by William F. Friedman [1]) of putting two texts side-by-side and counting the number of times that identical letters appear in the same position in both texts. This count, either as a ratio of the total or normalized by dividing by the expected count for a ...
Vigenère. Vigenère may refer to: Blaise de Vigenère, a 16th-century French cryptographer. The Vigenère cipher, a cipher whose invention was later misattributed to Vigenère. Category: