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A Course in Computational Algebraic Number Theory

Henri Cohen
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TLDR
The first seven chapters guide readers to the heart of current research in computational algebraic number theory, including recent algorithms for computing class groups and units, as well as elliptic curve computations, while the last three chapters survey factoring and primality testing methods.
Abstract
A description of 148 algorithms fundamental to number-theoretic computations, in particular for computations related to algebraic number theory, elliptic curves, primality testing and factoring. The first seven chapters guide readers to the heart of current research in computational algebraic number theory, including recent algorithms for computing class groups and units, as well as elliptic curve computations, while the last three chapters survey factoring and primality testing methods, including a detailed description of the number field sieve algorithm. The whole is rounded off with a description of available computer packages and some useful tables, backed by numerous exercises. Written by an authority in the field, and one with great practical and teaching experience, this is certain to become the standard and indispensable reference on the subject.

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Journal ArticleDOI

A general Lagrange Theorem

TL;DR: It may be useful to have at hand a simple and virtually computation-free proof of a general Lagrange Theorem for the ordinary continued fractions expansion of a real number.
Proceedings ArticleDOI

A linear time algorithm for quantum 2-SAT

TL;DR: This paper presents an algorithm for quantum 2-SAT which runs in linear time, i.e. deterministic time O(n+m) for n and m the number of variables and clauses, respectively.
Proceedings ArticleDOI

Solvability by radicals from an algorithmic point of view

TL;DR: This paper reduces the problem to that of cyclic extensions of prime degree and work out the radicals, using the work of Girstmair, and applies the general framework to the construction of Hilbert Class fields of imaginary quadratic fields.
Journal ArticleDOI

Reductions and simplifications of orbital sums in a Hamiltonian repeller

TL;DR: In this article, it was shown that in the presence of a complete Smale horseshoe, the sum of the coordinates of orbital points for low periodic orbits of the Hamiltonian Henon map reduces to simple rational numbers every so often.
Posted Content

Comparing the difficulty of factorization and discrete logarithm: a 240-digit experiment.

TL;DR: In this paper, the RSA-240 and RSA-250 factorizations over a 795-bit prime field were reported, showing that computing a discrete logarithm is not much harder than a factorization of the same size.
References
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Book

A Course of Modern Analysis

TL;DR: The volume now gives a somewhat exhaustive account of the various ramifications of the subject, which are set out in an attractive manner and should become indispensable, not only as a textbook for advanced students, but as a work of reference to those whose aim is to extend the knowledge of analysis.
Journal ArticleDOI

Modular multiplication without trial division

TL;DR: A method for multiplying two integers modulo N while avoiding division by N, a representation of residue classes so as to speed modular multiplication without affecting the modular addition and subtraction algorithms.
Book

Advanced Topics in the Arithmetic of Elliptic Curves

TL;DR: In this article, the authors continue the study of elliptic curves by presenting six important, but somewhat more specialized topics: Elliptic and modular functions for the full modular group.
Journal ArticleDOI

Improved methods for calculating vectors of short length in a lattice, including a complexity analysis

TL;DR: In this paper, the authors show that searching through an ellipsoid is in many cases much more efficient than enumerating all vectors of Z'.. in a suitable box.
Journal ArticleDOI

Lattice basis reduction: improved practical algorithms and solving subset sum problems

TL;DR: Empirical tests show that the strongest of these algorithms solves almost all subset sum problems with up to 66 random weights of arbitrary bit length within at most a few hours on a UNISYS 6000/70 or within a couple of minutes on a SPARC1 + computer.
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