On 2022-01-14 at 16:42 +0000, Стефан Васильев wrote: > Hi all, > > If people have a modern Telefax machine, have you ever > tried out to send a GnuPG signed Fax? > > I was thinking about the following: > > One prepares his message in the following way: > > ---begin message--- > > Message. > > --end message--- > > Then saves the message, detach signs it and converts the > detached signature as QR-code which is put then also on > the Fax document, while the receiver then OCR scans the > document and decodes the QR-code.
What's wrong with simply using a PGP clearsign signature? -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Dear Mr Васильев I hereby send you this signed document with the information you requested: Gur nggnpx jvyy or ynhapurq ba fvkgu Whar Yours faithfully -----BEGIN PGP SIGNATURE----- iIcEARYIAC8WIQQCizm6L17e6dtQkgGnASDnmmvMqAUCYeH06xEcYW5nZWxAMTZi aXRzLm5ldAAKCRCnASDnmmvMqL6LAP9TIWvEqVFLAPbAZWqCegFvO2KEp/44ovJu XpE9FoZqiQD/U4Xz0ePZJNThyxzJuNwVyh8C2Iz3Kw3DFpYf3vF68Aw= =ZQiA -----END PGP SIGNATURE----- Of course, you need to properly OCR the signature, but you already need to properly OCR all the text anyway. (Hint: the final checksum may help). The font choice could be helpful in getting good OCR results as well. _______________________________________________ Gnupg-users mailing list Gnupg-users@gnupg.org http://lists.gnupg.org/mailman/listinfo/gnupg-users
