Identity federation is a powerful scheme that links accounts of users maintained distinctly by different business partners. The concept of network identity is a driver for accelerating automation of Web Services on the Internet for users on their behalf while protecting privacy of their personally identifiable information. Although users of Web Services essentially delegate some or all privileges to an entity to perform actions, current identity based systems do not take into sufficient consideration delegation between entities hosting Web Services from a viewpoint of identity and privacy. This paper introduces a delegation model for federated identity management systems and proposes a delegation framework to provide solutions for access control in the context of delegation. The framework has a function of transferring user's privileges across the entities encoded in delegation assertion extending SAML (Security Assertion Markup Language). The framework enables users to manage their own privileges, and service providers to control access of entities based on delegated privileges by the users with assistance of a delegation authority that authorizes delegation of a delegating entity and an authentication authority that authenticates a user and manages user's name identifiers.
Identity federation is a key factor for a user to access multiple service providers seamlessly. Many protocols that federate between the providers have been proposed. Such protocols are operated under the same rules of identity management between the federated providers. Moreover, cross-protocol federation that uses different protocols for federation between the providers has also been proposed. However, the providers cannot federate all user information even though they do so using the cross-protocol federation because they do not confirm whether the federated providers obey the same rules or not. A federation bridge that converts and regulates the interaction messages between the providers is described herein. With it, the provider can federate based on the rules that a user and the providers determine.
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