Sign pdf in linux12/14/2023 (pdfsig is part of the poppler-utils, Linux Mint Software Center installed them for me. Revealed that the timestamp server URL is part of the signature. $ pdfsig path.pdf -nssdir (Firefox profile path) -dump I inserted some URLs into the list in (menu) Tools / Options / Security / (button) TSAs, tested them, and when I selected one of the entries to timestamp my signature in the (menu) File / Export As / Export As PDF / (tab) Digital Signatures / (dropdown) Time Stamp Authority, my signature validated as a PAdES signature in LibreOfficeDraw. Since timestamping signatures is a good idea, I searched and found a list of free timestamp servers. I could sign my PDF, open it in LibreOffice Draw, and it validated as a correct Adobe signature. So I manually gave LibreOffice the differing path in Tools / Options / Security / Certificate Path, and could select my certificate. It took me hours to find the reason: LibreOffice on Linux searches for signing certs in Firefox' or Thunderbird's certificate store, I had migrated my Firefox profile from Windows, and instead of throwing the profile contents into the default profile folder I had used another folder and edited Firefox' configuration. When I first selected (menu) File / Export as / Export as PDF / (tab) Digital signatures / (button) Select., I saw. If you want to sign click with right button over a PDF file, on open with, will be shown the Clicksign digital signature options that acts ovet that. But before doing it for the first time, you might need to tell LibreOffice where your Firefox profile with the Firefox certificate store is located, and maintain a list of timestamp servers' URLs that work for you. Open the PDF document that you want to sign (LibreOffice Draw opens it in. Or you sign an existing PDF by (menu) File / Digital Signatures / Sign Existing PDF. Signing PDF documents Go to File >Digital Signatures and click Sign Existing PDF. You can export to PDF every LibreOffice document and in the export dialogue select your personal digital signature certificate. The process itself is very easy if you use LibreOffice and Firefox. As long as you don't have an SSL certificate, you cannot use this kind of official signature method, but can sign it with GPG. on the website of the association how to obtain a code and object signing SSL certificate, and how to handle, configure and use certificates in your system(s), browser(s) and applications. In this contribution I stress on the act of signing PDF documents, and just say: Inform yourself e.g. To produce a widely accepted signature that validates as a PAdES signature, you need to sign your PDF with an SSL signature of X.509 standard, that the issuing Certificate Authority (CA) has flagged to be intended for code / object signing.
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