The reason I'm looking for it, or was, is that I have a hundred of these routers and I don't want to provision them manually. When I looked into building a provisioning system, it appeared that in order for them to connect home safely, they have to use their built in SSL key which is a linksys one.
At least, that's what things look like based on what I've read.
Bottom line is I just wanted a secured connection for them to call home and get updates.