Refer
this [
^]article, you'l get really very good explanation of how you can implement .NET Passport Authentication in Web applications using ASP.NET. You will get the steps that are required to implement
.NET Passport Authentication.
What is Passport authentication?
Passport authentication
provides authentication using Microsoft’s passport service.
If passport authentication is configured and users login using passport then the authentication duties are off-loaded to the passport servers.
Passport
uses an encrypted cookie mechanism to indicate authenticated users. The passport users are considered authenticated while the rest are redirected to the passport servers to log in, after which they are redirected back to the site.