Claim based authentication is a authentication mechanism which acts as an alternative to the traditional username/password mode of authentication. Claim based authentication makes it easy to implement features like Single Sign On, by re-using the same set of security token across multiple applications / services.
In Claim based authentication, the application/service is relieved from implementing the logic to validate a user’s identity; instead the validation is done by an independent Identity Provider, commonly known as Security Token Service (STS)
