Digital Signatures Help Requested

I looked through the forums and there was one thread not too long ago that talked about digital signatures but didn't seem to focus on this particular problem, so I figured I'd start a new one hoping someone would have some advice.
We receive a document that is digitally signed by our client. We view the PDF in the full version of Acrobat and have added these users as Trusted Users (in managed trusted identities).
We Verify the Signatures that were added to the document and see the digital signatures at the bottom of the document but there's one thing that's not showing up and that's the actual "signature" or "signed signature" of the person. We only see a typed out version of their name.
We've spoken to our client and they maintain that we should be viewing the "signed signature" and we need to figure it out.
When I check the Signature Properties, it tells me that their signatures were created using "Entrust.PPKEF". Could this be the problem?
As much as I'm reading up on Digital Signatures, it's my belief that we don't need to purchase any other software in order to view these properly. Am I mistaken.
Any help would sure be appreciated.
Paul

Hi Paul,
Are you expecting a "wet ink" type of signature? That is, an image in the signature field that is a copy of a signature someone created with pen and paper? If that's what you really need then maybe a digital signature workflow is not what you should require from your client. However, in many respects a digital signature (at least in the electronic world) is a much more powerful tool then a wet ink facsimile.
In this day and age, anyone could grab an image of a wet ink signature, crop it and use it apply it to a document as if they were the original signer. In others words, in the electronic world a wet ink signature is not very secure. However, a digital signature cryptographically binds the signer to the document. As long as the digital ID used to create the digital signature comes from a trusted third party (i.e. a certificate authority that vettes the identity of the individual before they issue the digital ID) then you are get two things from the digital signature. One is document integrity (you will know if the document has been altered post signing), and the other is non-repudiation (the signer cannot deny that they were the person that applied the digital signature). If you are accepting digital IDs (it's the "manage trusted identities" thing you mentioned) issued by a certificate authority that does not vette the identity of the signer then you have to be a bit more leery of trusting the signer.
I don't know if the Entrust signature method has the ability to add a custome appearance that includes the wet ink facsimile, but if it does, your client could create a digital signature whose appearance looks like a wet ink signature. However, the bottom line is the lack of a wet ink  facsimile is not a cause of concern when it comes to digital signatures  in PDF files.
Steve

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