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xiv CONTENTS<br />

6.2.3 Basic NFS: Complexity . . . . . . . . . . . . . . . . . . 285<br />

6.2.4 Basic NFS: Obstructions . . . . . . . . . . . . . . . . . . 288<br />

6.2.5 Basic NFS: Square roots . . . . . . . . . . . . . . . . . . 291<br />

6.2.6 Basic NFS: Summary algorithm . . . . . . . . . . . . . . 292<br />

6.2.7 NFS: Further considerations . . . . . . . . . . . . . . . . 294<br />

6.3 Rigorous factoring . . . . . . . . . . . . . . . . . . . . . . . . . 301<br />

6.4 Index-calculus method for discrete logarithms . . . . . . . . . . 302<br />

6.4.1 Discrete logarithms in prime finite fields . . . . . . . . . 303<br />

6.4.2 Discrete logarithms via smooth polynomials and smooth<br />

algebraic integers . . . . . . . . . . . . . . . . . . . . . . 305<br />

6.5 Exercises . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 306<br />

6.6 Research problems . . . . . . . . . . . . . . . . . . . . . . . . . 315<br />

7 ELLIPTIC CURVE ARITHMETIC 319<br />

7.1 Elliptic curve fundamentals . . . . . . . . . . . . . . . . . . . . 319<br />

7.2 Elliptic arithmetic . . . . . . . . . . . . . . . . . . . . . . . . . 323<br />

7.3 The theorems of Hasse, Deuring, and Lenstra . . . . . . . . . . 333<br />

7.4 Elliptic curve method . . . . . . . . . . . . . . . . . . . . . . . 335<br />

7.4.1 Basic ECM algorithm . . . . . . . . . . . . . . . . . . . 336<br />

7.4.2 Optimization of ECM . . . . . . . . . . . . . . . . . . . 339<br />

7.5 Counting points on elliptic curves . . . . . . . . . . . . . . . . . 347<br />

7.5.1 Shanks–Mestre method . . . . . . . . . . . . . . . . . . 347<br />

7.5.2 Schoof method . . . . . . . . . . . . . . . . . . . . . . . 351<br />

7.5.3 Atkin–Morain method . . . . . . . . . . . . . . . . . . . 358<br />

7.6 Elliptic curve primality proving (ECPP) . . . . . . . . . . . . . 368<br />

7.6.1 Goldwasser–Kilian primality test . . . . . . . . . . . . . 368<br />

7.6.2 Atkin–Morain primality test . . . . . . . . . . . . . . . . 371<br />

7.6.3 Fast primality-proving via ellpitic curves (fastECPP) . 373<br />

7.7 Exercises . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 374<br />

7.8 Research problems . . . . . . . . . . . . . . . . . . . . . . . . . 380<br />

8 THE UBIQUITY OF PRIME NUMBERS 387<br />

8.1 Cryptography . . . . . . . . . . . . . . . . . . . . . . . . . . . . 387<br />

8.1.1 Diffie–Hellman key exchange . . . . . . . . . . . . . . . 387<br />

8.1.2 RSA cryptosystem . . . . . . . . . . . . . . . . . . . . . 389<br />

8.1.3 Elliptic curve cryptosystems (ECCs) . . . . . . . . . . . 391<br />

8.1.4 Coin-flip protocol . . . . . . . . . . . . . . . . . . . . . . 396<br />

8.2 Random-number generation . . . . . . . . . . . . . . . . . . . . 397<br />

8.2.1 Modular methods . . . . . . . . . . . . . . . . . . . . . . 398<br />

8.3 Quasi-Monte Carlo (qMC) methods . . . . . . . . . . . . . . . 404<br />

8.3.1 Discrepancy theory . . . . . . . . . . . . . . . . . . . . . 404<br />

8.3.2 Specific qMC sequences . . . . . . . . . . . . . . . . . . 407<br />

8.3.3 <strong>Prime</strong>s on Wall Street? . . . . . . . . . . . . . . . . . . 409<br />

8.4 Diophantine analysis . . . . . . . . . . . . . . . . . . . . . . . . 415<br />

8.5 Quantum computation . . . . . . . . . . . . . . . . . . . . . . . 418<br />

8.5.1 Intuition on quantum Turing machines (QTMs) . . . . . 419

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