Adobe Acrobat lets you create true digital signatures, which most lawyers would love to be able to use. Most lawyers want this feature, not because they understand much about digital signatures, but because they like the word "true." They figure it must be better than a "less than true." What's a "less than true" digital signature? A simple stamp made from a scan of your signature isn't a true digital signature. But it's useful.
The stamp feature is useful because it lets people believe you actually scrawled on paper with a pen. The stamp saves you from having to print out the document to scrawl, only to have to scan it back in. In other words, it is every bit as good as a paper signature. It looks like a paper signature and people never question it. Having people never question your signature is useful in most situations.
A true digital signature, on the other hand, has more security than a purely paper based version. If you think this is automatically good, read on.
You can make your digital signature have a stamp, which fulfills the need to make people believe you scrawled on paper. But when a recipient opens up a PDF that's been signed with a "true digital signature" the program starts asking questions. It wants to know: is this a signature I have in my database of valid signatures? If it isn't then you'll see something like the screenshot below. You can click on the screenshot to enlarge it, in which case you'll see that it says "at least one signature has problems." That's the "true digital signature" that they're talking about.
The people who want you to believe that true digital signatures are highly prized will say "well you can right click on the signature warning and choose to 'validate' the signature." Yeah, you can do that. And that's what I did for the signature above. The next screenshot shows the dialogue box that I was presented with.
You'd think that by simply clicking that button you'd be telling Acrobat "this is a valid signature, please remove all warnings and go back to 'mall cop mode.'"
But no, that's not what happened when I clicked it. The clicking did nothing. I kept clicking and nothing happened. The warnings remained, and so did the dialogue box. If that's the result of creating a "true digital signature" I want no part of it.
I'm sure I could research the vast array of information about digital signatures and figure out how to solve this problem. But most lawyers won't do that. So until the average person can accept a true digital signature they're not ready for Prime Time. Until then, I'll be stamping my documents with a plain old stamp, and my documents will never be questioned by a poorly implemented computer algorithm. Now that's useful.
To read prior posts about about digital signatures, click here.