Can we disable diffie-hellman-group14-sha1 by default?

Darren Tucker dtucker at
Sun Jan 20 11:48:44 AEDT 2019

On Sun, 20 Jan 2019 at 12:21, Yegor Ievlev <koops1997 at> wrote:
> Also, are DH groups sent by server signed in addition to server's
> supported algorithms?

Yes.  From RFC4419 section 3:

   The server responds with:

     string  server public host key and certificates (K_S)
     mpint   f
     string  signature of H

   The hash H is computed as the HASH hash of the concatenation of the
     string  I_S, the payload of the server's SSH_MSG_KEXINIT
     mpint   p, safe prime
     mpint   g, generator for subgroup

Darren Tucker (dtucker at
GPG key 11EAA6FA / A86E 3E07 5B19 5880 E860  37F4 9357 ECEF 11EA A6FA (new)
    Good judgement comes with experience. Unfortunately, the experience
usually comes from bad judgement.

More information about the openssh-unix-dev mailing list