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 World that was Ours The World that was Ours The World that was Ours (1967) is Hilda Bernstein's personal account of life in Johannesburg under the oppressive surveillance of the apartheid regime. Hilda and her husband Rusty Bernstein were both detained, along with many others, in the aftermath of the Sharpeville massacre of 1960. Upon their release, Rusty was placed under house arrest, while Hilda's day-to-day activities were closely monitored by the Special Branch, if not altogether prohibited. Her memoir recalls these fraught years in the build-up to the landmark Rivonia Trial, the events and ordeals of the Trial itself, and finally the couple's