Behind the enigma : the authorised history of GCHQ, Britain's secret cyber-intelligence agency /
Ferris, John Robert, 1956-
Behind the enigma : the authorised history of GCHQ, Britain's secret cyber-intelligence agency / John Ferris. - Edition Published. - UK; London: Bloomsbury Publishing, 2021. - xiii, 831 pages, 12 unnumbered pages of plates : illustrations (some colour), portraits, photographs ; 24 cm
Includes maps in endpapers and portrait on cover.
Includes bibliographical references in endnotes and index.
9781526605481
Great Britain. Government Communications Headquarters.
Espionage--History--Great Britain--20th century.
HC445 / .F345 2021
Behind the enigma : the authorised history of GCHQ, Britain's secret cyber-intelligence agency / John Ferris. - Edition Published. - UK; London: Bloomsbury Publishing, 2021. - xiii, 831 pages, 12 unnumbered pages of plates : illustrations (some colour), portraits, photographs ; 24 cm
Includes maps in endpapers and portrait on cover.
Includes bibliographical references in endnotes and index.
9781526605481
Great Britain. Government Communications Headquarters.
Espionage--History--Great Britain--20th century.
HC445 / .F345 2021