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

My Answer may not be the the best one, However you can use some tricky mechanism like

1. whenever you are going on another application you need to pass one token from application A to B.
2. Validate this token on B site.
3. and Authorized that user based on token. (i mean apply silent or backdoor login)