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Entities (e.g., users, services) have to authenticate themselves to Service Providers (SPs) in order to use their services. An entity provides Personally Identifiable Information (PII) that uniquely identifies it to an SP. In the traditional application-centric IDentity Management (IDM) model, each application keeps trace of identities of the entities that use it. In cloud computing, entities may have multiple accounts associated with different SPs, or one SP. Sharing PIIs of the same entity across services along with associated attributes can lead to mapping of PIIs to the entity.
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