Cross-domain authentication ASP.net MVC

Question

I have two different web application built with ASP.net MVC. This two application may not be running in the same server nor in the same domain.

I would like that if a us

Answer 1

OWIN OAuth 2.0 Authorization Server http://www.asp.net/aspnet/overview/owin-and-katana/owin-oauth-20-authorization-server