Can we disable diffie-hellman-group-exchange-sha1 by default?

[Yegor Ievlev]

Also, how are default moduli shipped with OpenSSH for use in
diffie-hellman-group-exchange-sha1/sha256 chosen? Are they chosen
randomly by developers or are they chosen for security properties? If
they are random, why not use moduli from RFC 7919 instead, like
Mozilla recommends?

On Fri, Feb 15, 2019 at 3:48 AM Mark D. Baushke <mdb at juniper.net> wrote:
>
> Yegor Ievlev <koops1997 at gmail.com> writes:
>
> > Can we disable diffie-hellman-group14-sha1 too?
>
> It is possible to disable the diffie-hellman-group14-sha1 key exchange,
> but I personally recommend you just put it at the end of the list, so it
> is not normally used for the key exhcange unless that is the ONLY thing
> that your client has in common with the server (or vice versa).
>
> I know of a number of devices out there which want one of the MTI key
> exchange methods to be used.
>
>         -- Mark