I have installed under /usr/local/ and created a start script okular-sign with the variable definitions as in the TU Dresden manual. I have completed the installation using the instructions in the script (watch out for truncated lines in the online-preview!) on KDE Neon 5.20 (based on Ubuntu 20.04 LTS) using Poppler as of Commit 407293bf and Okular as of Commit 110ccd61 (future versions should of course continue to work, so this is just for full reproducibility). Instructions and a build script are provided with the TU Dresden post. Note that this not about inserting a graphics with your scanned signature, but about adding a solid digital certification to the PDF, similar to what is supported by some Adobe products.Īs of December 2020, it is already possible to compile the current development version of Okular and the Poppler PDF library locally to obtain the feature. Details are found in a post by TU Dresden, who has sponsored the implementation of this feature. Okular (and Poppler) will support digital signatures in PDFs in its official release starting April 2021. Acrobat is, or at least used to be, a major offender in this regard-I have seen documents trivially "forged" because of this ill-conceived feature. It offers no security at all and in fact is detrimental to it: upon seeing your scribble on a document, recipients may be tempted to assume that it is authentic and not bother to check for an actual (and legally valid) electronic signature. png of my signature, and I basically want to insert it into the document on the dotted lineĪnyone having access to your PNG or any document where it is used, such as the PDF you are intending to embed this on, will have a perfect, infinitely reproducible copy of your autograph signature. To my knowledge, currently none of Okular's backends support electronic signatures, although that feature has been requested a number of times.Īs an alternative, a PDF (or any other file) may be signed using a detached signature with GPG or any of its numerous frontends (such as Kleopatra or Kgpg in KDE).
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