![]() Alberti's system only switched alphabets after several words, and switches were indicated by writing the letter of the corresponding alphabet in the ciphertext. The very first well-documented description of a polyalphabetic cipher was by Leon Battista Alberti around 1467 and used a metal cipher disk to switch between cipher alphabets. In the 19th century, the scheme was misattributed to Blaise de Vigenère (1523–1596) and so acquired its present name. ![]() In 1863, Friedrich Kasiski was the first to publish a general method of deciphering Vigenère ciphers. Many people have tried to implement encryption schemes that are essentially Vigenère ciphers. This earned it the description le chiffrage indéchiffrable ( French for 'the indecipherable cipher'). įirst described by Giovan Battista Bellaso in 1553, the cipher is easy to understand and implement, but it resisted all attempts to break it until 1863, three centuries later. It employs a form of polyalphabetic substitution. The Vigenère cipher ( French pronunciation: ) is a method of encrypting alphabetic text by using a series of interwoven Caesar ciphers, based on the letters of a keyword. A reproduction of the Confederacy's cipher disk used in the American Civil War on display in the National Cryptologic Museum
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