Chapter 10 Notes > Section 10 > Page 1086 > Note (c)

	Notes for: Processes of Perception and Analysis | Cryptography and Cryptanalysis Cryptanalysis The so-called Vigenère cipher was thought for several centuries to be unbreakable. The idea of looking for repeats was introduced by Friedrich Kasiski in 1863. A statistical approach based on the fact that frequencies tend to be closer to uniform for longer keys was introduced by William Friedman in the 1920s. The methods described in the main text are fairly characteristic of the mixture between generality and detail that is typical in practical cryptanalysis. PAGE IMAGE RELATED LINKS Pages related to this note: 599, 600 All notes on this page: History [of cryptography] Basic theory [of cryptography] [Redundancy in] text Cryptanalysis Linear feedback shift registers All notes for this section Downloadable programs for this page Downloadable images Search Forum for this page Post a comment NKS | Online FAQs

From Stephen Wolfram: A New Kind of Science [citation]