Sinclair McKay

Behind the veil of secrecy: GCHQ emerges from the shadows

After 100 years of implacable silence, GCHQ finally opens its files to John Ferris, though a few mysteries still remain

With almost 159 quintillion settings, the Enigma machine was considered unbreakable — though not by Bletchley Park. Credit: Alamy
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  • Behind the Enigma: The Authorised History of GCHQ, Britain’s Secret Cyber-Intelligence Agency

    John Ferris

    Bloomsbury, pp. 804, £30

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