Cryptanalysis of the Enigma Bletchley Park to describe the network that used the same Enigma setting sheets. Initially these were recorded using coloured pencils and were given the names "red", "light blue" etc., and later the names of birds such as "kestrel". During World War II the settings for most networks lasted for 24 hours, although towards the end of the war, some were changed more frequently. The sheets had columns specifying, for each day of the month, the rotors to be used and their positions, the ring positions and the plugboard connections. For security, the dates were in reverse chronological order down the
The Origins of the Second World War The Origins of the Second World War The Origins of the Second World War is a non-fiction book by the English historian A. J. P. Taylor, examining the causes of World War II. It was first published in 1961 by Hamish Hamilton. Taylor had previously written "The Struggle for Mastery in Europe", which covered the period 1848 until 1918. As he later wrote in his autobiography: I wanted to be writing something and decided that I could carry on my diplomatic history from the point where the "Struggle for Mastery" left off. I had, I thought, done most of the