Skip to Content.
Sympa Menu

cado-nfs - Re: [cado-nfs] Cado-nfs Failed Factoring 143 digits

Subject: Discussion related to cado-nfs

List archive

Re: [cado-nfs] Cado-nfs Failed Factoring 143 digits


Chronological Thread 
  • From: Paul Zimmermann <Paul.Zimmermann@inria.fr>
  • To: "Thomas D. Dean" <tomdean@wavecable.com>
  • Cc: cado-nfs@inria.fr
  • Subject: Re: [cado-nfs] Cado-nfs Failed Factoring 143 digits
  • Date: Mon, 18 Apr 2022 07:41:43 +0200
  • Authentication-results: mail3-relais-sop.national.inria.fr; dkim=none (message not signed) header.i=none; spf=SoftFail smtp.mailfrom=Paul.Zimmermann@inria.fr; spf=None smtp.helo=postmaster@tomate

Tom,

> But, changing dep to 33 works
>
> > /usr/local/lib/cado-nfs-3.0.0/sqrt/sqrt -poly
> /tmp/cado.xqnxt6gq/c125.poly -prefix /tmp/cado.xqnxt6gq/c125.dep.gz -dep
> 33 -t 8 -side0 -side1 -gcd
> ...
> Alg(33): start lifting mod p^8597103 (42591736 bits) at 425.35s (wct
> 198.00s)
> Alg(33): maximal sqrt bit-size = 38719321 (91% of target size)
> Alg(33): square root lifted at 462.49s (wct 212.61s)
> Alg(33): square root is:
> 52716005196028843586068227373656872295379668114482324634946516981071158768655789989744250698332643024421805928484276029268
> Alg(33): square root completed at 462.52s (wct 212.78s)

this is the algebraic square root a. You should get the rational square root
Rat(33)=r in the same output. Then gcd(N,a-r) or gcd(N,a+r) should give a
factor. If not, try another dependency.

Paul



Archive powered by MHonArc 2.6.19+.

Top of Page