New York: W. W. Norton & Company, Inc., (1943). First printing. Diagrams, typographical examples. Cloth over boards. Octavo. 164 pages. Very good in a very good dust jacket. Shallow bumps at spine ends, minor extremity rubs. Jacket has chipping to head of spine with losses up to 1//2" depth, a bit of fading to spine, other shallow edge wear.
Published during World War II, the importance of cryptography to the Allied armed forces is emphasized in this systematic presentation of the basic elements thereof. Includes interesting and typical examples of methods and procedures used, including the fundamental principles of substitution and transposition ciphers.
There are appendices on enciphering Japanese, the Baconian bilateral cipher, frequency tables, definitions, and a bibliography.