Military cryptanalysis
By: by William F. Friedman
Publisher: U.S. G.P.O.
Published: 1938
Place of publication: Washington, D.C
Language: eng
Subjects: Ciphers; Cryptography
Notes: Title from electronic t.p. (viewed on May 3, 2010).

At head of title: War Department. Office of the Chief Signal Officer, Washington.

"Declassified and approved for release by NSA on 09-19-2005 pursuant to E.O. 12958, as amended."

Includes bibliographical references and indexes.
Table of contents: title: pt. 1. Monoalphabetic substitution systems; title: pt. 2. Simpler varieties of polyalphabetic substitution systems; title: pt. 3. Simpler varieties of aperiodic substitution systems; title: pt. 4. Transportation and fractionating systems.