Secure Authentication for Remote Desktop Protocol

Hi. I'd like to configure secure authentication for Remote Desktop
Protocol.

Because I have a small number of known users, I decided to use the
application SelfSSL to generate a certificate. After running SelfSSL,
I got the following error:

"Error opening metabase:0x800401454"

I don't know what causes this error, but I suspect that it may be due
to the fact that IIS is not installed. SelfSSL asks for a "site id",
which I believe refers to the id of an IIS web site. What would be the
id of Remote Desktop anyway?

Can I not use SelfSSL for this purpose? Should I be using another
mechanism for deriving a certificate? I don't want to fool around with
setting up a PKI. We don't need it.

Also, are there other issues that I will run into while setting up
this secure authentication sans IIS?

P.S. FYI I'm running Server 2003.