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Alastair Denniston
Scottish cryptographer (1881–1961)
Alastair Denniston
Commander Alexander Guthrie Denniston (1 December 1881 – 1 January 1961) was a Scottish codebreaker, deputy head of the Government Code and Cypher School (GC&CS) and hockey player. Denniston was appointed operational head of GC&CS in 1919 and remained so until February 1942.
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