What is passport Authentication in Asp.net

•  It is a third party authentication which means we use another website in order to authenticate our user.        Client makes a request for a secured web  page.     IIS allows user as anonymous which is compulsory in order to implement any other authentication method.        User enters into ASP.Net and this time it redirects user to passport.com website as the user is anonymous and doesn’t hold passport identity.        Now passport will return login page to the user. Where user enters credentials and resubmits to passport. Passport checks and creates identity called Passport Identity. After creating identity it redirects the user back to website. Again IIS allows and this time ASP.Net also allows user with security.