Dilly: The Man who Broke Enigmas
Alfred Dillwyn Knox was a famously eccentric & temperamental codebreaker who cracked German ciphers in both wars & decoded the Herodas papyri. Knox, the son of a famous religious scholar, worked in the Admiralty's Room 40 codebreaking operation during the First World War & during the Second World War he was Britain's chief cryptographer.
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Reviewed by this author for History Today.
Dillwyn Knox (1884-1943) is remembered as being the sole British codebreaker of high status for work in both world wars. He came from a quite remarkable family described by Penelope Fitzgerald in `The Knox Brothers'. After more than 65 years Mavis Batey, one of his most productive assistants, has put her own recollections of working with him at Bletchley Park in 1941-1942 together with information now declassified by GCHQ, the renamed Government Code and Cypher School.
So the book provides authentic accounts of his work on various types of Enigma enciphering machines over seven years. The story of his work in `Room 40', later `ID25', form 1915 to 1918 is set out. It is evident that Knox was a key participant in the development of the GC&CS between the two wars and that without such development the world might well have become a very different place. Mrs Batey is able to explain her own major achievement in breaking in to Italian naval Enigma. Strongly recommended for those interested in military intelligence 1914-1945.