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This book constitutes the refereed proceedings of the 8th International Algorithmic Number Theory Symposium, ANTS 2008, held in Banff, Canada, in May 2008. The conference included four invited talks, by Johannes Buchmann (TU Darmstadt), Andrew Granville (Université de Montréal), François Morain (École Polytechnique), and Hugh Williams (University of Calgary), a poster session, and 28 contributed talks in appropriate areas of number theory. Each submitted paper was reviewed by at least two experts external to the Program Committee; the selection was made by the committee on the basis of those recommendations. The Selfridge Prize in computational number theory was awarded to the authors of the best contributed paper presented at the conference. The participants in the conference gratefully acknowledge the contribution made by the sponsors of the meeting. The 28 revised full papers presented together with 2 invited papers were carefully reviewed and selected for inclusion in the book. The papers are organized in topical sections on elliptic curves cryptology and generalizations, arithmetic of elliptic curves, integer factorization, K3 surfaces, number fields, point counting, arithmetic of function fields, modular forms, cryptography, and number theory. Invited Papers Running Time Predictions for Factoring Algorithms Ernie Croot, Andrew Granville, Robin Pemantle, and Prasad Tetali A New Look at an Old Equation R.E. Sawilla, A.K. Silvester, and H.C. Williams Elliptic Curves Cryptology and Generalizations Abelian Varieties with Prescribed Embedding Degree David Freeman, Peter Stevenhagen, and Marco Streng Almost Prime Orders of CM Elliptic Curves Modulo p Jorge Jiménez Urroz Effciently Computable Distortion Maps for Supersingular Curves Katsuyuki Takashima On Prime-Order Elliptic Curves with Embedding Degrees k = 3, 4, and 6 Koray Karabina and Edlyn Teske Arithmetic of Elliptic Curves Computing in Component Groups of Elliptic Curves J.E. Cremona Some Improvements to 4-Descent on an Elliptic Curve Tom Fisher Computing a Lower Bound for the Canonical Height on Elliptic Curves over Totally Real Number Fields Thotsaphon Thongjunthug Faster Multiplication in GF(2)[x] Richard P. Brent, Pierrick Gaudry, Emmanuel Thomé, and Paul Zimmermann Integer Factorization Predicting the Sieving Effort for the Number Field Sieve Willemien Ekkelkamp Improved Stage 2 to P±1 Factoring Algorithms Peter L. Montgomery and Alexander Kruppa K3 Surfaces Shimura Curve Computations Via K3 Surfaces of Néron–Severi Rank at Least 19 Noam D. Elkies K3 Surfaces of Picard Rank One and Degree Two Andreas-Stephan Elsenhans and Jörg Jahnel Number Fields Number Fields Ramified at One Prime John W. Jones and David P. Roberts An Explicit Construction of Initial Perfect Quadratic Forms over Some Families of Totally Real Number Fields Alar Leibak Functorial Properties of Stark Units in Multiquadratic Extensions Jonathan W. Sands and Brett A. Tangedal Enumeration of Totally Real Number Fields of Bounded Root Discriminant John Voight Point Counting Computing Hilbert Class Polynomials Juliana Belding, Reinier Bröker, Andreas Enge, and Kristin Lauter Computing Zeta Functions in Families of Ca,b Curves Using Deformation Wouter Castryck, Hendrik Hubrechts, and Frederik Vercauteren Computing L-Series of Hyperelliptic Curves Kiran S. Kedlaya and Andrew V. Sutherland Point Counting on Singular Hypersurfaces Remke Kloosterman Arithmetic of Function Fields Effcient Hyperelliptic Arithmetic Using Balanced Representation for Divisors Steven D. Galbraith, Michael Harrison, and David J. Mireles Morales Tabulation of Cubic Function Fields with Imaginary and Unusual Hessian Pieter Rozenhart and Renate Scheidler Modular Forms Computing Hilbert Modular Forms over Fields with Nontrivial Class Group Lassina Dembélé and Steve Donnelly Hecke Operators and Hilbert Modular Forms Paul E. Gunnells and Dan Yasaki Cryptography A Birthday Paradox for Markov Chains, with an Optimal Bound for Collision in the Pollard Rho Algorithm for Discrete Logarithm Jeong Han Kim, Ravi Montenegro, Yuval Peres, and Prasad Tetali An Improved Multi-set Algorithm for the Dense Subset Sum Problem Andrew Shallue Number Theory On the Diophantine Equation x² + 2ᵅ5ᵝ13ᵞ = yⁿ Edray Goins, Florian Luca, and Alain Togbé Non-vanishing of Dirichlet L-functions at the Central Point Sami Omar Author Index