Historical person
Historical biography and chronological timeline for John Jeffreys, based on 2 World History Database records associated with Great Britain.
The first operational break into Enigma when the team working under Dilly Knox, with the mathematicians John Jeffreys, Peter Twinn and Alan Turing, unravelled the German Army administrative key that became known at Bletchley Park as The Green, encouraged by this success, the codebreakers later crack the Red key used by the Luftwaffe
The first operational break into Enigma when the team working under Dilly Knox, with the mathematicians John Jeffreys, Peter Twinn and Alan Turing, unravelled the German Army administrative key that became known at Bletchley Park as The Green, encouraged by this success, the codebreakers later crack the Red key used by the Luftwaffe
This biography is assembled from World History Database records filtered by country and personal-name fields. Exact duplicate display records are removed. The database is an index rather than a complete narrative biography; formal research should verify entries against relevant primary or specialist sources.