num_pages: 186
description: This book, written by historians of the Army Security Agency, now unclassified, is the story of (1) the War Department's Code and Cipher Section, headed by William F. Friedman, and (2) the Cipher Bureau MI-8), headed by Herbert O. Yardley. The text describes the administration and problems of the Cipher Bureau (MI-8) in New York, as well as the cryptanalytic solutions accomplished by that organization (later to become known as the American Black Chamber). Why the Cipher Bureau (MI-8) ceased operations in 1929 is described in detail. Text includes an index.
language: English
title: History of Codes and Ciphers in the U.S. During the Period Between World Wars: 1919-1929
titlecomplete: History of Codes and Ciphers in the U.S. During the Period Between World Wars: 1919-1929 (Cryptographic Series)
publisher: Aegean Park Pr