Re: Critiquing surrogate factoring

From: C. Bond (cbond_at_ix.netcom.com)
Date: 03/30/05


Date: Wed, 30 Mar 2005 20:38:08 GMT

C. Bond wrote:

> jstevh@msn.com wrote:
>
> > The idea is simple enough, factor one number and use its factorization
> > to get the factorization of another. The point being taking a number
> > that is hard to factor, and yet, factoring it, by factoring an easier
> > number.
> >
> > I thought it might help to try and write the the gist of it in a
> > theorem.
> >
> > Surrogate Factoring Theorem:
> >
> > Given M, a target natural number to be factored, and j, an integer
> > chosen such that j^2>M^2, a rational factor b_2 of M is given by
> >
> > b_2 f_1 = (-(Az - 2M^2)+/- sqrt((Az - 2M^2)^2 - 4TM^2))/2
> >
> > where T = M^2 - j^2, and f_1 is a rational factor of T, and where Az is
> > given by
>
> If j^2>M^2, as required above, then T is negative. Is that what you want?

Since James has apparently chosen not to answer this question, perhaps he will
answer another. Does the statement "f_1 is a rational factor of T" mean that
f_1 is *any* rational factor of T? Or does it mean that f_1 is a particular
rational factor T whose value is to be determined by some means? By the way,
for completeness, what is your definition of a "rational factor"?

--
There are two things you must never attempt to prove: the unprovable -- and the
obvious.
--
Democracy: The triumph of popularity over principle.
--
http://www.crbond.com


Relevant Pages

  • Re: Factoring problem, my assertion revisited
    ... [Rick Decker] ... > factorization has to satisfy a condition involving quadratic residues ... > I'm pretty sure I've posted a sample using James' method to factor 15. ... sense of what JSH might be saying. ...
    (sci.math)
  • Re: Surrogate factoring, more theory
    ... > then this bears a small resemblance to the elliptic curve method: ... so indeed James' algorithm would be polynomial time. ... pushing the factorization to some other number. ... factors of 2, to balance out ...
    (sci.crypt)
  • Re: Factoring problem, my assertion revisited
    ... [Rick Decker] ... > factorization has to satisfy a condition involving quadratic residues ... > I'm pretty sure I've posted a sample using James' method to factor 15. ... sense of what JSH might be saying. ...
    (sci.crypt)
  • Re: Surrogate factoring explained
    ... >> James' algorithms has flaws, but this isn't one of them. ... -if the previous steps don't produce a full factorization, but the cofactors ... of some pair are both within reach of practical MPQS effort, ...
    (sci.crypt)
  • Re: Basically a sieve method, relation to quantum
    ... > factorization of 2*M, but your idea is much simpler and more elegant. ... and yours is just the special case of picking j=M (I know James ... be factored in polynomial time if he got to assume instead that factoring ... even I can write a linear-time Python program ...
    (sci.math)