I am a Linux desktop user.
Someone sends me a PDF file which is digitally signed. It is supposed to be signed using some kind of government / regulated body / official institution issued certificate.
Is there a way that I, as a typical end-user, could determine whether the signature is valid?
I know Windows Acrobat Reader works to some extend, though even there it's not really clear about the validity of a signature as opposed to the fact that it's there and seems to be from XYZ.