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Service Oriented Architectures is a concept which exposes capabilities in distributed, domain-spanning environments as services. These modern systems have three characteristics: They are heterogeneous, distributed and loose Coupling. With increasing popularity of Service Oriented Architecture (SOA), this is no longer possible since interacting systems are generally not located within a single security domain anymore. Using SOA without extra attention to security issues leads to various problems. Federated Identification is one of the most important security issues in collaborative systems which are not in the same security domain. To deal with this security issue, several Federated Identity Architecture initiatives have appeared recently. Federated identity architecture lets users dynamically distribute identity information across security domains, increasing the portability of their digital identities.
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