The enigma of Ultra


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History Today
Vol. 43, no. 9 (September 1993), p. 15-20


The code for survival - the dedicated work of Code and Cypher School at Bletchley Park during the Second World War broke enemy cyphers with crucial benefits for the allied war effort. Now the full story is being told for the first time of that intelligence - and here Harry Hinsley, who was himself a participant in the Bletchley team, assesses its importance and speculates on the war might have gone without it