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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:6.3-4


gmp-ecm (6.3-4) unstable; urgency=low

  * Use gcc-4.3 on sparc as 4.4 causes build failure (closes: #593193).
  * Explicitly disable assert (default=yes was upstream's mistake).

 -- Laurent Fousse <>  Wed, 01 Sep 2010 11:21:25 +0200

gmp-ecm (6.3-3) unstable; urgency=low

  * Add build depends on m4 for {kfreebsd-,}amd64 (closes: #593021).

 -- Laurent Fousse <


r1501 | kruppa | 2010-04-18 22:14:22 +0200 (Sun, 18 Apr 2010) | 5 lines

Version 6.3.
Assertions off by default.
Added new thresholds to 64-bit parameter files in build.vc9/.

r1500 | kruppa | 2010-04-17 01:40:06 +0200 (Sat, 17 Apr 2010) | 4 lines



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):
    Jim Fougeron <jfoug at cox dot net>
    Laurent Fousse <laurent at komite dot net>
    Alexander Kruppa <> (substitute appropriately)
    Dave Newman <davi

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