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On 1/14/2021 11:52 AM, Stefan Claas wrote: > On Thu, Jan 14, 2021 at 8:16 PM Stefan Claas > <spam.trap.mailing.li...@gmail.com> wrote: >> >> On Thu, Jan 14, 2021 at 10:46 AM Ayoub Misherghi via Gnupg-users >> <gnupg-users@gnupg.org> 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. > > Here is a quick manually inline sig. > > First message with GnuPG symmetric content in Comment lines > and second same message with Google's Adiantum+base64 > > You see the difference, what I mean with format preserving. > Hello World! :-)> > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA256 > > Hello World! :-) > > Regards > Stefan > -----BEGIN PGP SIGNATURE----- > Comment: vHgPAUzXglLiVFelwf0jjUzXCNIqSrinvNhjF+JRkd8K > > iHUEARYIAB0WIQR61Pk5PUF7u6Rs+mem3tVibXmEGgUCYACeDgAKCRCm3tVibXmE > Gpk6AP98iXZb8gd0NDvOllByTHkrcQvQluXd/db1c5u+skm90gEAj5c991XdP5s5 > clB9wwK9G8XoCDJnhfMLWljuvjCM8Ac= > =XJXL > -----END PGP SIGNATURE----- > > Regards > Stefan
Yes I see, thanks. You went at length to help me. Can you please point me to a reference that discusses the standard format of the signature file? I might do something silly.
Best regards, Ayoub |
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