OpenID on Intranets

Quick answers to a couple of questions that came up when I was discussing OpenID as part of a single-sign-on solution at work.

Q. Won’t OpenID allow people to log in using insecure authentication servers, thus undermining the security of our system?

A. No, because we do not have to allow just any server to be used for OpenID. We can restrict OpenID URIs to a white list of known good servers through simple pattern-matching.

Q. Our employees already have Global Employee Numbers; they won’t want to learn how to use OpenID URIs just to use your application.

Change the login form so that it asks for the GEN, and then adds the and then the base address of the OpenID server automatically. E.g., they enter ABCD1234 and the login page expands it to