Re: Looking for a cryptographic primitive

[bram]

On Thu, 9 Mar 2000, bram wrote:

> Does anybody know of a field in which a + b and a * b can be computed
> quickly but (and this is important) it's computationally intractable to
> compute the additive inverse of a?
> 
> [Bram: All fields of n elements are isomorphic to all other fields of
> n elements

I'm not using the additive or multiplicative identity, maybe eleminating
the requirement for those increases the number of mathematical structures
available?

-Bram