Openssh 6.5p1 - diffie hellman key agreement scheme

Damien Miller djm at
Mon Jul 3 22:26:18 AEST 2017

On Mon, 3 Jul 2017, murugesh pitchaiah wrote:

> Hi All,
> Can any one help to find out which of the following scheme(s) are
> supported by openssh 6.5p1:
> dhHybrid1, MQV2, dhEphem, dhHybridOneFlow, MQV1, dhOneFlow, dhStatic.
> I see from the code, the 'p' and 'g' are static. Other parameters are
> ephemeral. Hence could not conclude if that is dhStatic or dhEphem.

I don't know what these names are referring to. OpenSSH supports
Diffie-Hellman in both specified well-known groups and in groups
that are selected at runtime. In all cases, the keys are ephemeral
and are never reused between connections.


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