Cryptanalysis
by Helen Fouché Gaines · first published 1956
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This is a very simple code to break. Helen Fouché Gaines' book Cryptanalysis (published in 1939) is a good introduction : http://www.amazon.com/Cryptanalysis-Study-Ciphers-Their-Solu...
on “Can you crack a code?” ↗…US cryptographers (as far as I know) and is explained in an interesting Scientific American in the July 1966 edition, see [7]. See also [8]. * Pre-computer age cryptography [1] Helen Fouché Gaines, Cryptanalysis, https://archive.org/details/cryptanalysis00hele [2] William F. Friedman, Riverbank Publications, https://en.wikipedia.org/wiki/Riverbank_Publications [3] William F. Friedman, The Friedman Lectures…
on “Zodiac Killer: Code-breakers solve San Francisco killer's cipher” ↗You might be interested to read "Cryptanalysis: A Study of Ciphers and Their Solution", a 1939 (!) book by Helen Fouché Gaines. It covers a lot of these kinds of variants.
on “Cracking the Adventure Time cipher” ↗If you like this kind of stuff, definitely check out the book "Cryptanalysis - a study of ciphers and their solution" by Helen Fouche Gaines. It has loads of interesting hand ciphers of historical interest, going approximately through WWII. It also has tips for how to break them,…
on “Hand Ciphers” ↗…paper and pencil cipher that can usually be broken by hand with even modest amounts of material[1]. The Playfair (and the Wheatstone bridge) were invented by Sir Charles Wheatstone. [1] Helen F. Gaines, Cryptanalysis, chapter 21. https://www.amazon.com/Cryptanalysis-Study-Ciphers-Their-Sol...
on “Problems with Bruce Schneier's “Solitaire” (2001)” ↗