I feel like I'm going in circles trying to setup digital signatures for a demo.  Everything I read leads me back to the same problem..... the certificate.  I understand that you need to use a certificate authority to make digital signatures official, but what about for a demo?  The only thing I can find is a tutorial on setting up a private certificate using MS office which states that the certificate must be created on the computer it will be used on.  Does that mean I have to install MS office on our server just to create a certificate for the demo or is there another way?