Download e-book for iPad: Alan Turing: The Enigma (The Centenary Edition) by Andrew Hodges

By Andrew Hodges

It is just a moderate exaggeration to assert that the British mathematician Alan Turing (1912-1954) stored the Allies from the Nazis, invented the pc and synthetic intelligence, and expected homosexual liberation via decades--all prior to his suicide at age 41. This vintage biography of the founding father of laptop technology, reissued at the centenary of his beginning with a considerable new preface by way of the writer, is the definitive account of a rare brain and lifestyles. A gripping tale of arithmetic, pcs, cryptography, and gay persecution, Andrew Hodges's acclaimed e-book captures either the internal and outer drama of Turing's life.

Hodges tells how Turing's innovative thought of 1936--the inspiration of a common machine--laid the root for the trendy computing device and the way Turing introduced the belief to useful recognition in 1945 together with his digital layout. The booklet additionally tells how this paintings was once without delay on the topic of Turing's top function in breaking the German Enigma ciphers in the course of international battle II, a systematic triumph that used to be severe to Allied victory within the Atlantic. whilst, this is often the tragic tale of a guy who, regardless of his wartime carrier, used to be ultimately arrested, stripped of his safeguard clearance, and compelled to suffer a humiliating therapy program--all for attempting to stay in truth in a society that outlined homosexuality as a criminal offense.

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Extra info for Alan Turing: The Enigma (The Centenary Edition)

Sample text

3) for g0 . Note that the value g α could be computed by B and added to the public parameters, in case the verification of the consistency of the secret keys is desired for the scheme. 6) of its input. ,2m−1 , D, τ }. Simulation of key extraction queries. Whenever the adversary A makes a key extraction query for a subset of attributes A = {ati1 , . . ,m−2 for some random value r ∈ (Z/pZ) . To do so, B implicitly defines r = (ωyA γ + 1)QA (γ), where yA is randomly picked in (Z/pZ) , and the polynomial QA (X) is defined as QA (γ) = 1 when |AS | = 0, or QA (X) = λA · (X + τ (at)) at∈AS otherwise, in which case λA = ( at∈AS τ (at))−1 .

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Alan Turing: The Enigma (The Centenary Edition) by Andrew Hodges


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