Is signing a file with multiple keys possible

[Werner Koch]

On Sat, 24 Mar 2018 00:31, gnupg-users at gnupg.org said:

> For Example: John, Harry and Sally wrote a file, lets assume it is a
> text file. Now all of them want to sign this file, so that when
> verifying it, all three signatures are visible.

If you use binary detached signatures (-sb) this is pretty easy.  You
can simply concatenate the signature files.  We do this for gnupg
releases.  gnupg/build-auc/append-signature.sh is a script which helps
with this workflow.

If the messages are armored you need to de-armor (gpg --dearmor) them
first, concatenate and en-armor them.  Finnally fix up the armor lines.


Shalom-Salam,

   Werner


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