How to Implement SSO System in Rails Using CAS Server

Single-Sign-On is a hot topic right now. Several applications such as Google, Facebook, and Github use it. Probably you’ve noticed on some pages a “Sign in with Google” or “Login with Facebook” button which enables a user to log in to a page without creating a new account.Once you click on the button, you are redirected to the application. This is referred to SSO.