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Old 2013-04-24, 16:19   #2
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jasonp's Avatar
Oct 2004

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The built-in parameters for 210-digit polynomial selection are not going to work without manual intervention. For example, it's not clear whether you should look for degree-5 or degree-6. Check Readme.nfs for all the knobs that are necessary to specify how the search should proceed, you will need to override several of them in ways that are not clear to me.

You also should not start with a leading coefficient of 1; Paul Zimmermann has shown that you improve the chances of finding a good polynomial if you look for leading coefficients that balance the optimal skew against the size of the middle polynomial coefficient. That's definitely the case for degree-6, and probably true for degree 5.

If this is not an RSA challenge number, I hope it has had enough ECM thrown at it...
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