Project Gutenberg 2025-01-09 Public domain in the USA. 2291 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. https://openlibrary.org/works/OL7515752W/Cryptanalysis?edition=key%3A/books/OL7634764M 20241115085215gaines 1939 US en Cryptography Ciphers Z Text 1106098 2025-01-09T18:00:13.309473 text/html 1032998 2025-01-09T17:05:23 text/html 655857 2025-01-09T18:00:59.680748 application/epub+zip 675464 2025-01-09T18:00:31.694892 application/epub+zip 412572 2025-01-09T18:00:20.080433 application/epub+zip 1197248 2025-01-09T18:01:17.722715 application/x-mobipocket-ebook 1158586 2025-01-09T18:00:56.872814 application/x-mobipocket-ebook 819730 2025-01-09T18:00:08.828521 text/plain; charset=us-ascii 799985 2025-01-09T17:05:23 text/plain; charset=us-ascii 3982 2025-01-09T18:01:17.903664 application/rdf+xml 14199 2025-01-09T18:00:29.321396 image/jpeg 3925 2025-01-09T18:00:28.981413 image/jpeg 780686 2025-01-09T18:00:13.414526 application/octet-stream application/zip Archives containing the RDF files for *all* our books can be downloaded at https://www.gutenberg.org/wiki/Gutenberg:Feeds#The_Complete_Project_Gutenberg_Catalog en.wikipedia