Codebreaking and Signals Intelligence

by Christopher Andrew (Editor)

Despite publicity given to the successes of British and American codebreakers during the Second World War, the study of signals intelligence is still complicated by governmental secrecy over even the most elderly peacetime sigint. This book, first published in 1986, lifts the veil on some of these historical secrets. Christopher Andrew and Keith Neilson cast new light on how Tsarist codebreakers penetrated British code and cypher systems. John Chapman's study of German military codebreaking represents a major advance in our understanding of cryptanalysis during the Weimar Republic. The history of the Government Code and Cypher School - forerunner of today's GCHQ - by its operational head, the late A.G. Denniston, provides both a general assessment of the achievements of British cryptanalysis between the wars and a tantalising glimpse of what historians may one day find in GCHQ's forbidden archives. The distinguished cryptanalyst of Bletchley Park, the late Gordon Welchman, describes in detail how the Ultra programme defeated the German Enigma machine, while another Bletchley Park cryptographer, Christopher Morris, reminds us in his account of the valuable work on hand cyphers that wartime sigint consisted of much more than Ultra. Roger Austin's study of surveillance under the Vichy regime shows the continuing importance of older and simpler methods of message interception such as letter-opening. Taken together, the articles establish sigint as an essential field of study for both the modern historian and the political scientist.

Hardcover

Published January 1, 1986

About the author

Christopher Maurice Andrew, FRHistS is an Emeritus Professor of Modern and Contemporary History at the University of Cambridge with an interest in international relations and in particular the history of intelligence services. (military.wikia.org)

Reviews

[Terry Graap · Rating 1 out of 5]

This was a very hard book to read. Some of the things written in this book would lead you to believe you should me a mathematician to understand about the codes and signals. But, it enlightened me about how originally started on the Enigma Code that being the Poles instead of the British. The Poles, the British and French worked together on different methods to break the codes of the Germans.