Bill Allombert on Mon, 27 Jan 2014 14:02:57 +0100

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Re: Your help needed

On Mon, Jan 27, 2014 at 01:41:01PM +0900, SeongHan Shin wrote:
> Dear all,
> I have encountered with the following warning:
> ++++++++++++++++++ 512 bit +++++++++++++++++
> parisize = 500000000, primelimit = 500000
>   *** ellorder: Warning: MPQS: number too big to be factored with MPQS,
>   giving up.
> Could you please let me know how to get around this problem?

What do you want to do ? 
I assume you want to compute the order of a point on a elliptic curve
over a finite field of size around 512bit.
Unfortunately the number of points on the curve is too hard to be factored
by PARI.

But maybe you have extra information about your problem that you can use.
So please tell us more about your computation.