Alan Turing: The EnigmaA gripping story of mathematics, science, computing, war history, cryptography, and homosexual persecution and liberation. Hodges tells how Turing's revolutionary idea of 1936-- the concept of a universal machine-- laid the foundation for the modern computer. Turing brought the idea to practical realization in 1945 with his electronic design. This work was directly related to Turing's leading role in breaking the German Enigma ciphers during World War II, a scientific triumph that was critical to Allied victory in the Atlantic. Despite his wartime service, Turing was eventually arrested, stripped of his security clearance, and forced to undergo a humiliating treatment program-- all for trying to live honestly in a society that defined homosexuality as a crime. This New York Times bestselling biography of the founder of computer science and artificial intelligence is the definitive account of an extraordinary mind and life. --Excerpted from 2014 version, published by Princeton University Press. |
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Page 169
... rotor was encircled by a ring bearing the 26 letters , so that with the ring fixed in position , each letter would label a rotor position . * ( In fact , the letter would show through a window at the top of the machine . ) However , the ...
... rotor was encircled by a ring bearing the 26 letters , so that with the ring fixed in position , each letter would label a rotor position . * ( In fact , the letter would show through a window at the top of the machine . ) However , the ...
Page 176
... rotor Enigma . There was another difficulty , which was that since 1 January 1939 the German systems had used ten pairs on the plugboard , which made the Polish Bombe method unlikely to work . Be- hind all this lay a deeper problem ...
... rotor Enigma . There was another difficulty , which was that since 1 January 1939 the German systems had used ten pairs on the plugboard , which made the Polish Bombe method unlikely to work . Be- hind all this lay a deeper problem ...
Page 224
... rotor . Hitherto , the naval Enigma settings had continued to involve a choice of three rotors out of eight , for which there were 336 possibilities . Had the machine been modified to allow a free choice of four rotors out of nine , the ...
... rotor . Hitherto , the naval Enigma settings had continued to involve a choice of three rotors out of eight , for which there were 336 possibilities . Had the machine been modified to allow a free choice of four rotors out of nine , the ...
Contents
The Spirit of Truth | 46 |
New Men | 111 |
The Relay Race 160 | 160 |
Copyright | |
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Alan Turing Alan Turing's Alan wrote Alan's American AMT's arithmetic Bletchley Bletchley Park Bombe boys brain Britain British calculation called Cambridge cathode ray tube chess Christopher cipher Computable Numbers cryptanalytic Darwin delay line Delilah differential analyser digits discussion Don Bayley Donald Michie EDVAC electronic enciphered engineering ENIAC Enigma machine fact G.H. Hardy German Hanslope Hilbert homosexual human idea instructions intelligence interest kind King's knew letter logical Manchester mathematician mathematics Max Newman mechanical messages method mind Morcom naval Enigma Neumann never Newman operations organisation paper perhaps Peter Hilton physical play plugboard position possible Princeton problem question Robin Gandy rotor scientific secret sexual Shaun Wylie Sherborne signals symbols talk tape teleprinter theorem theory thing thought took Turing machine U-boat universal machine Womersley word writing