[gnutls-help] too few bits from gnutls_dh_params_generate2() ?

Pierre Ossman ossman at cendio.se
Tue Nov 11 13:35:56 CET 2014

On Tue, 11 Nov 2014 13:32:01 +0100,
Manuel Pégourié-Gonnard wrote:

> On 11/11/2014 12:50, Pierre Ossman wrote:
> > TBH, I've never gotten a good grasp on what a good security policy is with
> > regard to DH params. Some have pregenerated values, but I also see 
> > references that they should be regenerated every few hours/days/etc.
> > 
> > Got any insight to share?
> > 
> The DH params (ie: prime and generator) can totally be static. There are even
> RFCs defining standardising values for them (3526, 5114, maybe more).
> The thing that should be regenerated regularly (ideally every key exchange,
> for truly ephemeral DH) is your private-public DH key pair.

Is that done by GnuTLS implicitly? I don't see anything in our use of
GnuTLS that generates such things even once.

Pierre Ossman           Software Development
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A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?
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