Note that the mechanics of how the actions are performed is not described. More detail provided in the detailed use case scenarios in the next section of this document. In this use case, a Web user authenticates with a Web site. The Web user then uses a secured resource at another Web site, without directly authenticating to that Web site. Web user authenticates to the source Web site.
Web user uses a secured resource at the destination Web site.
In this use case, a user attempts to access a resource or service. Each scenario contains a short description of the scenario, a UML sequence diagram illustrating the action in the scenario, a description of each step, and a list of requirements that are related to the scenario. This scenario is an elaboration of the Single Sign-on use case. In this model, the destination Web site pulls authentication information from the source Web site based on references or tokens provided by the Web user. Single Sign-on, Pull Model.