Routledge Library Editions: Internationa Codebreaking and Signals Intelligence, Book 2, (Hardcover)

This book, first published in 1986 and an essential study of signals intelligence, examines Tsarist codebreakers and cryptanalysis during the Weimar Republic; the history of the Government Code and Cypher School; the Ultra programme; hand cyphers and wartime sigint; and surveillance under the Vichy regime.