At PDF for Lawyers, Ernie the Attorney provides a great tutorital on creating a digital signature in Adobe Acrobat. The problem with using a digital signature in Acrobat is that most people don’t understand them. In addtion to your name, the digital signature contains other information that verifies that you signed the document and that it has not been changed since.
Ernie explains:
A signature, digital or not, has to satisfy two elements: (1) non-repudiability, and (2) acceptance by the receiving party.  In other words, the point of signing a document is so the recipient knows it’s from you, and that you can’t deny it’s from you (i.e. you can’t repudiate authorship of the document).  Digital signatures are far superior to regular signatures in this arena.  Where they fail miserably is in the ‘acceptance’ part.Because digital signatures are not familiar to most people they freak out if they see a bunch of numbers where they’re used to seeing indecipherable human scrawl.  So, how to remedy this problem?The quick and dirty fix is to do what I outline in that blurb I mentioned a few sentences ago. Just create a stamp and slap that on the document you want to ‘sign.’  It won’t be secure like a real digital signature (and if you want to repudiate it you can say your secretary exceeded her authority and stamped it without your knowledge).  But, let’s say you’re a fair-minded, by-the-rules kind of guy (or gal).  Is there another option?
Fortunately Ernie has solved this problem. Simply go to his post and follow his few simple steps to create a digital signature with an appearance that won’t freak people out.