The class "Authentication" is used to represent authentication requirements required by a service. In particular, this class, together with the associated properties allows us to model the type of authentication the service needs (e.g., authentication through the national e-ID system, none, authentication using other smart card based systems, ecc) and the levelo of security for the identification that is required (e.g., credentials, one-time passowrd, biometric mechanisms). A controlled vocabulary must be used in order to specify the type of required authentication. The vocabulary is the following: https://w3id.org/italia/controlled-vocabulary/classifications-for-public-services/authentication-type.