Hal says:
From: rcain@netcom.com (Robert Cain)
Now, the tutorial over :-), the question is; is there a "standard" well-known-prime, w, and a "standard" well-known-modulus, m, and if ^^^^^-- generator not, let's define one.
I don't think there is a need for this. The two sides need to agree on a pair but they could just pick it at the beginning. If everyone uses the same m,w it would help attackers of the scheme to focus their efforts on these numbers.
Indeed, a paper has been published on how to break Sun Secure RPC based on the idiotic decision by someone at Sun to standardise the modulus used. It is basically a matter of precomputing a lot of data based on the numbers which allows you to break any particular discrete log in that field on the fly. The suggestion by Mr. Cain to use a single generator and modulus for all traffic is astonishingly naive. Perry