"polyalphabetics" - 1 õppematerjal

TheCodeBreakers

instead? Apparently because they disliked its slowness and distrusted its accuracy. Encipherment in a polyalphabetic system, with its need to keep track of which alphabet was in use at every point and to make sure that the ciphertext letter was taken from that alphabet, could not compare in speed with a nomenclator encipherment. The well-informed author of an anonymous 17th-century "Traitte de 1'art de deschiffrer" in the Royal Archives at Brussels stated that chancelleries do not use polyalphabetics because it takes too long to encipher them and because the dropping of a single ciphertext letter garbles the message from that point on. In 1819, William Blair, in a superb encyclopedia article  abcdefghiJklmnopqrstuvwxyz A ABCDEFGHIJKLMNOPQRSTUVWXYZ B BCDEFGHIJKLMNOPQRSTUVWXYZA C CDEFGHIJKLMNOPQRSTUVWXYZAB D DEFGHIJKLMNOPQRSTUVWXYZABC E EFGHIJKLMNOPQRSTUVWXYZABCD P FGHIJKLMNOPQRSTUVWXYZABCDE Q GHIJKLMNOPQRSTUVWXYZABCDEF