ABSTRACT

The importance of codebreaking and signals intelligence in the diplomacy and military operations of World War II is reflected in this study of the cryptanalysts, not only of the US and Britain, but all the Allies. The codebreaking war was a global conflict in which many countries were active. The contributions reveal that, for the Axis as well as the Allies, success in the signals war often depended upon close collaboration among alliance partners.

chapter 1|17 pages

Axis Sigint Collaboration

A Limited Partnership

chapter 2|22 pages

Automating American Cryptanalysis 1930–45

Marvelous Machines, a Bit Too Late

chapter 5|35 pages

The ‘Usual Source'

Signals Intelligence and Planning for the Eighth Army ‘Crusader' Offensive, 1941

chapter 6|27 pages

Cautious Collaborators

The Struggle for Anglo-American Cryptanalytic Co-Peration 1940–43

chapter 7|22 pages

Searching for Security

The German Investigations into Enigma's Security

chapter 8|8 pages

New Intelligence Releases

A British Side to the Story

chapter 9|25 pages

Signals Intelligence and Vichy France, 1940–44

Intelligence in Defeat

chapter 10|13 pages

Chinese Codebreakers, 1927–45