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Alexander, (Conel) Hugh O'Donel (1909–1974), chess player and cryptanalyst, was born in Cork on 19 April 1909, the eldest of four children of Conel William Long Alexander (1879–1920), professor of engineering at University College, Cork, and his wife, Hilda Barbara Bennett (1881–1964), of ...

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T. F. Henderson

revised by Philip Carter

Blencowe, William (1683–1712), cryptographer, was born on 6 January 1683, the third son of Sir John Blencowe (1642–1726), a judge and baron of the exchequer, and his wife, Anne Blencowe (1656–1718), the eldest daughter of the mathematician and cryptographer John Wallis. He matriculated at ...

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Sir (James) Alfred Ewing (1855–1935) by Bassano, 1915 © National Portrait Gallery, London

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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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Foss, Hugh Rose (1902–1971), cryptanalyst, was born on 13 May 1902 in Kobe, Japan, one of five children of Hugh James Foss (1848–1932), Anglican bishop of Osaka, and his wife, Janet Ovans (b. 1870). He was educated at Hoylake, at Marlborough College...

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Grey, Nigel Arthur de (1886–1951), cryptanalyst, was born on 27 March 1886 at the rectory, Copdock, Suffolk, the son of the Hon. Arnold de Grey (b. 1856), rector of Copdock, and his wife, Margaret Maria Ponsonby Fane. His father was the son of the ...

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Murray [née Clarke], Joan Elisabeth Lowther (1917–1996), cryptanalyst and numismatist, was born at 45 Idmiston Road, West Norwood, London, on 24 June 1917, the youngest child (there were three sons, and another daughter) of William Kemp Lowther Clarke, a Church of England...

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Phelippes, Thomas (c. 1556–1625x7), cryptographer and intelligence gatherer, was the first son of William Philipps (d. 1590), a cloth merchant and customs officer for wool in the port of London, and his wife, Joan (d. 1613), daughter of Thomas Houghton. Little is known of ...

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John Hessell Tiltman (1894–1982) by unknown photographer private collection

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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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Sir Edward Wilfrid Harry Travis (1888–1956) by Walter Stoneman, 1946 © National Portrait Gallery, London

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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.

Known as ...

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John Wallis (1616–1703) by Sir Godfrey Kneller, 1701 © Bodleian Library, University of Oxford

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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...

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Willes, Edward (1694–1773), bishop of Bath and Wells and cryptanalyst, was born at Bishop's Itchington, Warwickshire, on 6 March 1694, the son of John Willes (1647/8–1700), rector of that parish, and his wife, Anne, daughter of Sir William Walker of Oxfordshire. The judge ...