How can I add encrypted comments.

Stefan Claas spam.trap.mailing.lists at
Thu Jan 14 20:16:47 CET 2021

On Thu, Jan 14, 2021 at 10:46 AM Ayoub Misherghi via Gnupg-users
<gnupg-users at> wrote:
> I am encrypting and signing documents with myself as the receiver. Nobody else will want to look inside them. Is it possible to add encrypted comments or other information to a separated signature file; and later retrieve this additional information? I want to be able to decrypt the signature file alone and retrieve all the information I put inside it.

You can add Comments: to a detached signature, yes, but beware that these
encrypted content must be seperated for each comment line.

I have not tested this yet, but you could with a shell script use some format
or lenght preserving encryption software, like Google's Adiantum with a base64
encoder and then would have the smallest possible symmetrically encrypted
output for a message as Comment: line. You can do this also manually
of course as much as you wish because it does not invalidate the signature.

Hope this helps a bit.


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