Secure web form authentication

@Nick: http://www.rebol.net/cookbook/recipes/0019.html The link shows a secure authentication method done by Carl Sassenrath; it uses a client Rebol application, and a server-side rebol script. Can you try to re-do it using a Web form in a html page, as this is the most common scenario for user authentication ?

I'm not a web guy and hesitate to provide any code in that environment which may be required to maintain critical security.