Are DSA2 signing keys backwards compatible?

David Shaw dshaw at
Mon Feb 11 04:10:59 CET 2008

On Sun, Feb 10, 2008 at 10:01:42PM -0500, David Shaw wrote:
> On Sun, Feb 10, 2008 at 08:30:24PM -0600, Kevin Hilton wrote:
> > Just to clarify for some other users,
> > 
> > What version of GnuPG were the DSA2 keys (or longer DSA signing keys)
> > and the additional SHA hashes introduced?
> They were not introduced at the same time.  As you said in your
> earlier mail, DSA2 was introduced in 1.4.8.  The new SHA hashes were
> introduced in the 1.3.x development series.  All 1.4 and later GPGs
> (including the 2.x series) have them.

I should clarify this.  DSA2 was enabled as part of standard OpenPGP
in 1.4.8.  We knew it was coming, though, so it exists as far back as
1.4.4 (June 2006).


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