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Hommel, W., Reiser, H. (2005):

Federated Identity Management: Shortcomings of existing standards

As the coverage area of conventional identity & access management solutions is limited by an organization's boundaries, several approaches for Federated Identity Management (FIM), i.e., cross--organizational identity and user data exchange, have emerged. In this paper we demonstrate that even the most important FIM standards have several shortcomings in common which are prejudicial to early FIM adoption in large heterogeneous service infrastructures.