security logic and private repositories? These issues become even more daunting to deal with as enterprises try to integrate these applications with each other, with third party security stores, and with security stores from mergers and partnerships. Historically, companies would try to solve these integration issues by replicating the information from these separate repositories into a central enterprise repository. The WS-Federation standard provides another way to deal with these issues. WS-Federation provides a claims-based security model that abstracts security logic from an application and also provides a simple infrastructure for leveraging multiple security repositories in applications without the use of replication.