Digitally sign latex pdf document with CA


I would like to know, if it is possible to digitally invisible sign a pdf created by latex automatically after

  • each time I create the document (I'm using Texnic Center) or
  • after I created the document manually (via command line)

I know, digitally signing is possible to do with MS-word documents (I tried that with my certificate) and following google, it's probably possible with Adobe, too.

With invisible digitally signing, I don't mean to add my written signature inside the document, but rather the signing via CA certificate, so that the user knows, that I was the one creating it and that the document has not been modified or changed, but came in the form, that I was creating it.

So, what would be the best way for me to digitally sign my Latex pdf documents?

Best Answer

There is an answer to this question on askubuntu:

gpg --clearsign --output=signed.pdf input.pdf

The user can check the signature with gpg --verify signed.pdf

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