Windows 2003 Apache Single sign-on

[Neo]

I've been trying to get my Apache web server (running on a Debian sarge box) to allow web apps to authenticate against the Windows Domain.
I managed to find an Apache Kerberos mod and it looked like what I had been looking for.
I went ahead and installed it then started configuring it according to the steps at the site.

Now I am stuck at this part where it says that I have to
"..create an service key for the module.."
I have no idea how to go about this and what I need to know to do this.

I have been stuck here for around 3 weeks now (asked at a couple of Linux forums but no response :-[).

So I finally decided to come ask here if anyone has any idea on how to go about this?