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Bancroft, Edward (1744–1821), chemist and spy, was born at Westfield, Massachusetts, on 9 January 1744. His tutor was Silas Deane, later a member of the American congress. After a brief apprenticeship to a physician in Connecticut, Bancroft went to sea at the age of eighteen. In 1763 he was in ...

Article

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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Knight, (Charles Henry) Maxwell (1900–1968), intelligence officer and naturalist, was born on 9 July 1900 at 199 Selhurst Road, South Norwood, Croydon, one of at least two sons of Hugh Coleraine Knight (d. 1914), a solicitor, and his wife, Ada Phyllis Roberts, ...

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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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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...