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Factor integers using the Elliptic Curve Method (library)

gmp-ecm is a free implementation of the Elliptic Curve Method (ECM) for integer factorization.

The original purpose of the ECMNET project was to make Richard Brent's prediction true, i.e. to find a factor of 50 digits or more by ECM. This goal was attained on September 14, 1998, when Conrad Curry found a 53-digit factor of 2^677-1 c150 using George Woltman's mprime program. The new goal of ECMNET is now to find other large factors by ecm, mainly by contributing to the Cunningham project, most likely the longest, ongoing computational project in history according to Bob Silverman. A new record was set by Nik Lygeros and Michel Mizony, who found in December 1999 a prime factor of 54 digits using GMP-ECM.

See for more information about ecmnet.

This package provides the shared library.

Package version:6.4.2-1


gmp-ecm (6.4.2-1) unstable; urgency=low

  * New upstream release:
    + Licenses are now GPL3+ or LGPL3+ depending on the files.
  * Simplify debian/copyright by no longer listing each individual

 -- Laurent Fousse <>  Mon, 30 Apr 2012 20:26:05 -0700

gmp-ecm (6.4.1~rc3-1) experimental; urgency=low

  * New upstream release candidate.

 -- Laurent Fousse <lfousse@debi


r1878 | zimmerma | 2012-03-19 10:11:57 +0100 (Mon, 19 Mar 2012) | 2 lines
Changed paths:
   M /trunk/ecm-params.h.athlon64
   M /trunk/ecm-params.h.core2
   M /trunk/ecm-params.h.corei5

updated default tuning parameters

r1877 | bouvierc | 2012-03-18 22


This package was debianized by Laurent Fousse <> on
Tue, 22 Apr 2003 10:19:24 +0200.

It was downloaded from

Upstream Authors (from upstream `AUTHORS' file):
    Cyril Bouvier <Cyril dot Bouvier at inria dot fr>
    Pierrick Gaudry <gaudry at lix dot polytechnique dot fr>
    Brian Gladman <brg at gladman dot plus dot com>
    Jim Fougeron <j

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