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
German Radio Intelligence Operations during World War II The following is a transcript of an intercept made by the RI Unit of the 252nd Infantry Division in the Gzhatsk Area on 24 February 1943. Prepared from private records in the possession of Colonel () Leo Hepp. Explanation of code designations: Left column is time. Right is message. German Radio Intelligence Operations during World War II German Radio Intelligence Operation during World War II were signals intelligence operations that were undertaken by German Axis forces in Europe during World War II. In keeping with German signals practice since 1942, the term "communication intelligence" () had been used when intercept