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...
…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…
你可能会对《密码分析：密码及其解法研究》（Cryptanalysis: A Study of Ciphers and Their Solution）感兴趣，这是海伦·福谢·盖恩斯在 1939 年（！）写的一本书。里面涵盖了大量这类变种密码。
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.
如果你喜欢这类内容，一定要看看海伦·福谢·盖恩斯写的《密码分析——密码及其解法研究》（Cryptanalysis - a study of ciphers and their solution）。书里记录了大量二战前极具历史价值的经典手算密码。此外还有如何破译它们的技巧……
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,…
…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...
这个密码破译起来非常简单。海伦·福谢·盖恩斯（Helen Fouché Gaines）1939 年出版的《密码分析》（Cryptanalysis）是一本很好的入门书：http://www.amazon.com/Cryptanalysis-Study-Ciphers-Their-Solu...
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...
……（据我所知）美国密码学家，1966 年 7 月刊的《科学美国人》里有段很有意思的解释，见 [7]。另见 [8]。* 计算机时代前的密码学 [1] 海伦·福谢·盖恩斯，《密码分析》（Cryptanalysis），https://archive.org/details/cryptanalysis00hele [2] 威廉·F·弗里德曼，《河岸出版物》（Riverbank Publications），https://en.wikipedia.org/wiki/Riverbank_Publications [3] 威廉·F·弗里德曼，《弗里德曼讲义》……
…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…
你可能会对《密码分析：密码及其解法研究》（Cryptanalysis: A Study of Ciphers and Their Solution）感兴趣，这是海伦·福谢·盖恩斯在 1939 年（！）写的一本书。里面涵盖了大量这类变种密码。
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.
如果你喜欢这类内容，一定要看看海伦·福谢·盖恩斯写的《密码分析——密码及其解法研究》（Cryptanalysis - a study of ciphers and their solution）。书里记录了大量二战前极具历史价值的经典手算密码。此外还有如何破译它们的技巧……
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,…
……一种纸笔手算密码，哪怕手头的密文数量很有限，通常也能手工破译[1]。普莱费尔密码（Playfair cipher，以及惠斯通电桥）是由查尔斯·惠斯通爵士发明的。[1] 海伦·F·盖恩斯，《密码分析》（Cryptanalysis），第 21 章。https://www.amazon.com/Cryptanalysis-Study-Ciphers-Their-Sol...
…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...