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 Kingdom of the Netherlands During World War II The Kingdom of the Netherlands During World War II The Kingdom of the Netherlands During World War II () is the standard reference on the history of the Netherlands during World War II. The series was written by Loe de Jong (1914–2005), director of the Dutch Institute for War Documentation ("Nederlands Instituut voor Oorlogsdocumentatie", or NIOD), and was published between 1969 and 1991. The series contains 14 volumes, published in 29 parts. De Jong was commissioned to write the work in 1955 by the Ministry of Education, Culture and Science. The first volume appeared in 1969, and de Jong wrote