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
Of Whom the World was Not Worthy Of Whom the World was Not Worthy Of Whom the World was Not Worthy is an English-language novel written by award-winning American author and psychologist Marie Chapian. The 256-page novel was published in 1978 by Bethany House Publishing. "Of Whom the World was Not Worthy" was written by Marie Chapian after travelling in the country formerly known as the Kingdom of Yugoslavia during the war known as the Invasion of Yugoslavia (also known as the April War), when the Axis Powers – an alliance made up of Germany, Italy, Japan, Hungary, Romania, and Bulgaria - during World War II (1939–1945).