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The story, loosely based on actual events, takes place in March 1943, when the Second World War was at its height. The cryptanalysts at Bletchley Park, Buckinghamshire, have a problem: the Nazi U-boats have changed one of their code reference books used for Enigma machine ciphers, leading to a blackout in the flow of vital naval signals intelligence.
The computing advances did not obviate the need for human labour, as the many teams of largely female operators certainly knew. Throughout the war, there were breakthroughs and setbacks when the design or use of the German Enigma machines was changed and the Bletchley Park code breakers had to adapt. [85] [88]
The Enigma machine is a cipher device developed and used in the early- to mid-20th century to protect commercial, diplomatic, and military communication. It was employed extensively by Nazi Germany during World War II, in all branches of the German military. The Enigma machine was considered so secure that it was used to encipher the most top ...
2002 plaque, Bletchley Park, "commemorat[ing] the work of Marian Rejewski, Jerzy Różycki, and Henryk Zygalski, mathematicians of the Polish intelligence service, in first breaking the Enigma code [sic: it was a cipher]. Their work greatly assisted the Bletchley Park code breakers and contributed to the Allied victory in World War II."
Their work greatly assisted the Bletchley Park code breakers and contributed to the Allied victory in World War II." Most German messages decrypted at Bletchley were produced by one or another version of the Enigma cipher machine, but an important minority were produced by the even more complicated twelve-rotor Lorenz SZ42 on-line teleprinter ...
The British read unsteckered Enigma messages sent during the Spanish Civil War, [15] and also some Italian naval traffic enciphered early in World War II. The strength of the security of the ciphers that were produced by the Enigma machine was a product of the large numbers associated with the scrambling process.
Dilly Knox, leading cryptologist, cracked the code of the commercial Enigma machines used in the Spanish Civil War, one of the British participants in the conference in which the Poles disclosed to their French and British allies their achievements in Enigma decryption, broke the Abwehr non-steckered Enigma
A 2012 London Science Museum exhibit, "Code Breaker: Alan Turing's Life and Legacy", [102] marking the centenary of his birth, includes a short film of statements by half a dozen participants and historians of the World War II Bletchley Park Ultra operations. John Agar, a historian of science and technology, states that by war's end 8,995 ...