Project Gutenberg 2025-01-09 Public domain in the USA. 472 Gaines, Helen Fouché 1888 1940 Fouché Gaines, Helen Gaines, Helen Fouche PICCOLA Lamb, George C. (George Chester) 1906 1939 DAMON Lamb, George Chester 39031782 Elementary cryptanalysis $aBoston :$bAmerican Photographic Publishing Co., $c1939. General information -- Concealment devices -- Transposition types -- Geometrical types: the Nihilist transposition -- Geometrical types: the turning grille -- Irregular types: columnar transposition -- General methods: multiple anagramming, etc. -- Substitution types -- Simple substitution: fundamentals -- The consonant-line short cut, a method for attacking difficult cases, by George C. Lamb -- Simple substitution with complexities -- Multiple-alphabet ciphers: the Vigenère -- The Gronsfeld, Porta, Beaufort ciphers -- The Kasiski method for periodic ciphers -- Miscellaneous phases of Vigenère decryptment -- Auto-encipherment -- Some periodic number-ciphers -- Periodic ciphers with mixed alphabets -- Polyalphabetical encipherment applied by groups -- Vigenère with key-progression -- Polygram substitution: the Playfair cipher -- Highlights of fractional substitution -- Investigating the unknown cipher -- Appendix: English frequency and sequence data; Comparative table of single-letter frequencies; Chart showing normal contact percentages, by F.R. Carter; Chart showing frequencies of English digrams, by O. Phelps Meaker; Some foreign language data; Bibliography, by W.D. Witt; The commonest English words, by Frank R. Fraprie; English trigrams, by Frank R. Fraprie; English digrams, by Frank R. Fraprie. "Elementary Cryptanalysis" by Helen Fouché Gaines is a scientific publication written in the late 1930s. This work serves as an instructional guide on the analysis and deciphering of various types of ciphers, primarily aimed at enthusiasts and students interested in cryptography. The book claims to fill a significant gap in English-language literature regarding cryptanalysis, providing readers with both theoretical knowledge and practical examples of how to solve cryptograms. The opening portion of the text introduces the definitions of key terms in cryptography, such as cryptography and cryptanalysis, while also highlighting the scarcity of accessible works on the latter topic for general readers. Gaines outlines the main types of ciphers, including concealment, transposition, and substitution, and emphasizes that her treatise focuses on basics rather than historical or literary aspects of ciphers. The preface sets up an educational framework to equip readers with the fundamentals they need to analyze and solve cryptograms, supported by a wealth of examples and exercises designed to test their skills. (This is an automatically generated summary.) https://openlibrary.org/works/OL7515752W/Cryptanalysis?edition=key%3A/books/OL7634764M 20241115085215gaines 1939 US Reading ease score: 66.4 (8th & 9th grade). Neither easy nor difficult to read. en Cryptography Ciphers Z Text Category: How To ... 1106374 2025-06-29T13:53:26.652485 text/html 1032998 2025-01-09T17:05:23 text/html 659296 2025-06-29T13:53:49.242812 application/epub+zip 678827 2025-06-29T13:53:32.207382 application/epub+zip 404130 2025-06-29T13:53:29.278402 application/epub+zip 1192804 2025-06-29T13:53:57.803750 application/x-mobipocket-ebook 1154196 2025-06-29T13:53:46.898804 application/x-mobipocket-ebook 819741 2025-06-29T13:53:22.694411 text/plain; charset=us-ascii 799985 2025-01-09T17:05:23 text/plain; charset=us-ascii 17846 2025-06-29T13:53:57.974799 application/rdf+xml 13379 2025-06-29T13:53:29.898415 image/jpeg 3592 2025-06-29T13:53:29.588407 image/jpeg 784203 2025-06-29T13:53:26.748457 application/octet-stream application/zip Archives containing the RDF files for *all* our books can be downloaded at https://book.klll.cc/wiki/Gutenberg:Feeds#The_Complete_Project_Gutenberg_Catalog en.wikipedia