As the number of applications grows, both in type and complexity, the different ways in which authentication and authorization is achieved also become more numerous. Hence, a user who has access to multiple applications will probably end up having multiple identities. Even if the applications share a single user repository, the user will still need to log in again, as the user credentials have not been carried between applications. Therefore, Single Sign-On (SSO) between applications has grown to be of vital importance within enterprises. Sun Java System Access Manager is the primary product in the Sun Java Enterprise System middleware stack for providing user authentication, authorization, and SSO of applications.
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