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Denniston, Alexander Guthrie [Alastair] (1881–1961), cryptanalyst and intelligence officer, was born on 1 December 1881 at Greenock, the eldest child of James Denniston, a medical practitioner, and his wife, Agnes Guthrie. He was educated at Bowdon College, Cheshire, and at the universities of ...

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Ewing, Sir (James) Alfred (1855–1935), engineer and cryptographer, was born on 27 March 1855 at 109 Nethergate, Dundee, the youngest of the three sons of James Ewing (1810–1886), minister of St Andrew's Free Church, Dundee, and his wife, Marjory, eldest daughter of John Ferguson...

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Tiltman, John Hessell (1894–1982), cryptanalyst, was born at 70 Torrington Square, Bloomsbury, London, on 25 May 1894, the youngest in the family of one daughter and two sons of Alfred Hessell Tiltman, architect, and his wife, Sarah Ann Jane Kerr. Tiltman was educated at ...

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Travis, Sir Edward Wilfrid Harry (1888–1956), naval officer and cryptographer, was born on 24 September 1888 at 7 Blendon Terrace, Plumstead Common, Kent, the son of Harry Travis (1858–1927), civil engineer, and his wife, Emmeline Hamlyn. He had a younger sister.

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Wallis, John (1616–1703), mathematician and cryptographer, was born on 3 December 1616 at Ashford in Kent. He was the third of five children of the Revd John Wallis (1567–1622), son of Robert Wallis of Finedon, Northamptonshire, Cambridge BA and MA (Trinity College...