Alastair Denniston

Alastair Denniston

Alastair Denniston- Code-breaking From Room 40 to Berkeley Street

Alastair Denniston- Code-breaking From Room 40 to Berkeley Street

Some of the individuals who played key roles in the success of Bletchley Park in reading the secret communications of Britain’s enemies during the Second World War have become well-known figures. However, the man who created and led the organisation based there, from its inception in 1919 until 1942, has, surprisingly, been overlooked – until now. In 1914 Alastair Denniston, who had been teaching French and German at Osborne Royal Navy College, was one of the first recruits into the Admiralty’s fledgling codebreaking section which became known as Room 40. There a team drawn from a wide range of professions successfully decrypted intercepted German communications throughout the First World War.After the Armistice, Room 40 was merged with the British Army’s equivalent section – MI.1 – to form the Government Code and Cypher School (GC&CS). Initially based in London, from August 1939 GC&CS was largely located at Bletchley Park, with...
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