That paper does not apply to integer factorization, and number field sieve computations in general. DJB himself, in another paper [1, §5], argues that is more c

That paper does not apply to integer factorization, and number field sieve computations in general. DJB himself, in another paper [1, §5], argues that is more cost effective to factor one number at a time. [1] http://eprint.iacr.org/2012/318 http://eprint.iacr.org/2012/318