Behind the enigma: the authorised history of GCHQ, Britain’s secret cyber-intelligence agency

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Notes

¹ Jon Agar, The Government Machine: A revolutionary History of the Computer (London: MIT Press, 2003), 207; R. A. Ratcliff, Delusions of Intelligence: Enigma, Ultra, and the End of Secure Ciphers (Cambridge: Cambridge University Press, 2006), 102–105; and Christopher Grey, Decoding Organization: Bletchley Park, Codebreaking and Organization Studies (Cambridge: Cambridge University Press, 2012).

² Ralf Bennett, Behind the Battle: Intelligence in the War With Germany, 1939–1945 (London: Pimlico, 1994, 1999), xxiii.

³ Harry Hinsley, “The Counterfactual History of no Ultra,” Cryptologia 20, no. 4 (1996): 319.

⁴ The National Archives, HW 72/9, Alastair Denniston to T. J. Wilson, 16 May 1938.

⁵ TNA, HW 64/73, Anonymous to Miss Moore, 12 November 1942.

⁶ TNA, HW 64/73, A.D(a) [Bradshaw] to H.S. Hoff, 6 August 1943.

⁷ Penny Summerfield, Reconstructing Women’s Wartime Lives: Discourse and Subjectivity in Oral Histories of the Second World War (Manchester: Manchester University Press, 1998), 7.

⁸ Luke Harding, “Behind the Enigma by John Ferris review – inside Britain’s most secret intelligence agency,” The Guardian, Behind the Enigma by John Ferris review – inside Britain’s most secret intelligence agency | History books | The Guardian (accessed October 25, 2021).