| Author |
Gaines, Helen Fouché, 1888-1940 |
| Contributor |
Lamb, George C. (George Chester), 1906-1939 |
| LoC No. |
39031782
|
| Title |
Elementary cryptanalysis
|
| Original Publication |
Boston: American Photographic Publishing Co., 1939.
|
| Contents |
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.
|
| Language |
English |
| LoC Class |
Z: Bibliography, Library science
|
| Subject |
Cryptography
|
| Subject |
Ciphers
|
| Category |
Text |
| EBook-No. |
75074 |
| Release Date |
Jan 9, 2025 |
| Copyright Status |
Public domain in the USA. |
| Downloads |
262 downloads in the last 30 days. |
|
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