"Serge"
Mar 2008
Phi(4,2^7658614+1)/2
9463_{10} Posts

RSA250
via NMBRTHRY list
Quote:
Date: February 28, 2020
For the past three months, ever since the DLP240 record announced in December 2019 [1], we have been in a historically unique state of affairs: the discrete logarithm record (in a prime field) has been larger than the integer factorization record. We are pleased to rectify this situation with the factorization of RSA250 from the RSA challenge list:
Code:
RSA250 = 2140324650240744961264423072839333563008614715144755017797754920881418023447140136643345519095804679610992851872470914587687396261921557363047454770520805119056493106687691590019759405693457452230589325976697471681738069364894699871578494975937497937
= 64135289477071580278790190170577389084825014742943447208116859632024532344630238623598752668347708737661925585694639798853367
* 33372027594978156556226010605355114227940760344767554666784520987023841729210037080257448673296881877565718986258036932062711
This computation was performed with the Number Field Sieve algorithm,
using the opensource CADONFS software [2].
The total computation time was roughly 2700 coreyears, using Intel Xeon Gold 6130 CPUs as a reference (2.1GHz):
RSA250 sieving: 2450 physical coreyears
RSA250 matrix: 250 physical coreyears
Here are the factors of p+/1 and q+/1:
p1 = 2 * 6213239 * 101910617047160921359 * 4597395223158209096147 * p77
p+1 = 2^3 * 3 * 7 * 223 * 587131 * 6071858568668069951281 * p93
q1 = 2 * 5 * 13 * 440117350342384303 * 8015381692860102796237 * p83
q+1 = 2^3 * 3^3 * 23 * 2531 * 11171 * 2100953 * p108
We used computer resources of the Grid'5000 experimental testbed in
France (INRIA, CNRS, and partner institutions) [3], of the EXPLOR
computing center at Universite de Lorraine, Nancy, France [4], an
allocation of computing hours on the PRACE research infrastructure using
resources at the Juelich supercomputing center in Germany [5], as well as
computer equipment gifted by Cisco Systems, Inc. at UCSD.
We would like to dedicate this computation to Peter L. Montgomery, who
passed away on February 18, 2020.
Fabrice Boudot, Education Nationale and Universite de Limoges, France
Pierrick Gaudry, CNRS, Nancy, France
Aurore Guillevic, INRIA, Nancy, France
Nadia Heninger, University of California, San Diego, United States
Emmanuel Thome, INRIA, Nancy, France
Paul Zimmermann, INRIA, Nancy, France
[1] https://caramba.loria.fr/dlp240rsa240.txt
[2] http://cadonfs.gforge.inria.fr/
[3] https://www.grid5000.fr
[4] http://explor.univlorraine.fr/
[5] http://www.praceri.eu/praceinafewwords/

