[Cado-nfs-discuss] how to configure parameters

meng qsmeng at 126.com
Fri Apr 1 13:56:18 CEST 2016


Dear Paul,









At 2016-03-31 23:12:11, "paul zimmermann" <Paul.Zimmermann at inria.fr> wrote: > Dear Meng, > >> Date: Thu, 31 Mar 2016 22:13:53 +0800 (CST) >> From: meng <qsmeng at 126.com> >> >> Dear Paul´╝î >> In cado-nfs2.2,you used method from your paper "better polynomial", where for different skewness, there exist many plolynomials. I obtain new polynomials by one polynomial subtracting another one and then select the one with smaller leading coefficient. usually these new polynomials will have smaller lognorm. >> I just use version 2.2 and the command is cado.py N workdire >> Best regards, >> Meng > >thus I conclude the better polynomial you got for RSA-120 was obtained with a >modified version of cado-nfs. Just curious, what is this polynomial?
 > >Paul

the polynomial goes like this:
n: 227010481295437363334259960947493668895875336466084780038173258247009162675779735389791151574049166747880487470296548479
skew: 34768.0
c0: 8300254538725833888531445545
c1: 665466551407346306968179
c2: 9320605370626500511
c3: 27435101433965
c4: -28964342892
c5: 19260
Y0: 2006365639456767948836
Y1: 2447097403723699729
# MurphyE (Bf=3.41e+06,Bg=1.57e+06,area=2.86e+13) = 9.43e-10
# lognorm 37.82
  In fact, I am also curious about the form it has before the root optimization.  it is the 557 polynomial after size optimization, but is the best after root optimization.

 Regards,
Meng
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