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

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 by way of decades--all earlier than his suicide at age 41. This vintage biography of the founding father of laptop technological know-how, reissued at the centenary of his delivery with a considerable new preface via the writer, is the definitive account of a rare brain and existence. A gripping tale of arithmetic, desktops, cryptography, and gay persecution, Andrew Hodges's acclaimed ebook captures either the interior and outer drama of Turing's life.

Hodges tells how Turing's innovative thought of 1936--the notion of a common machine--laid the root for the fashionable desktop and the way Turing introduced the belief to functional recognition in 1945 along with his digital layout. The ebook additionally tells how this paintings was once at once regarding Turing's top function in breaking the German Enigma ciphers in the course of global warfare II, a systematic triumph that used to be severe to Allied victory within the Atlantic. whilst, this can be the tragic tale of a guy who, regardless of his wartime carrier, was once finally arrested, stripped of his safeguard clearance, and compelled to suffer a humiliating therapy program--all for attempting to dwell truthfully in a society that outlined homosexuality as against the law.

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

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Knudsen [5] and Schroeppel [12] independently proposed a technique for elliptic curves over binary fields based on point halving. This method computes the multiple R of any point P of odd order such that 2R = P and Since for curves of order point halving is up to three times as fast as doubling, it is possible to improve performance of scalar multiplication by expanding the scalar using “powers of 1/2” and replacing the double-and-add algorithm with a halve-and-add method. 29%. The idea is that it is possible, using a single point halving, to replace some sequences of a having density 1/2 (and containing at least three non-zero coefficients) with sequences having weight 2.

In the Steps 2–4 we double points, inverting elements by INVERT. In each iteration of the loop in Steps 5–13, we add points and double points. So in each iteration we invoke INVERT with field elements. In the Steps 14–16 we add points, inverting elements by INVERT. Finally in Step 17 the TreeADD algorithm is invoked. Proposition 4. EFF-SCLR-MULT takes computations to compute the scalar multiplication mD where, is an integer, is the window size and The algorithm uses a table which must be precomputed.

7. V. Guruswami and M. Sudan, Improved decoding of Reed-Solomon and AlgebraicGeometric codes, IEEE Transactions on Information Theory, 45 : 1757-1767, 1999. 8. A. Kiayias and M. Yung, Cryptographic hardness based on the decoding of ReedSolomon codes with applications, Proceedings of ICALP 2002, LNCS 2380, pp 232-243, 2002. 9. A. Kiayias and M. edu/~ akiayias/. 10. M. Naor and B. Pinkas, Oblivious transfer and polynomial evaluation. In ACM, editor, STOC 99, pp 245-254, 1999. 11. S. Reed and G. Solomon, Polynomial codes over certain finite fields, J.

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