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Old 2007-07-17, 14:50   #2
akruppa
 
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"Nancy"
Aug 2002
Alexandria

2,467 Posts
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GMP-ECM will try n curves with the "-c n" command line option, however it will stop if it finds a factor and the cofactor is prime. With the "-one" option added, it will stop when it finds a factor, even if the cofactor is composite.

How to choose parameters depends on what factor size you are aiming for. Did you read the README file?

Btw, version 6.0.1 is a bit outdated. The current version is 6.1.2.

Alex
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