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Middleware for efficient and confidentiality-aware federation of access control policies

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Figure

Figure 1 Large organizations such as hospitals employ both SaaS applications and on-premise applications, leading to a federated setup.
Figure 2 This work builds upon the XACML referencearchitecture for policy-based access control infrastructures [12].
Figure 3 The case study that inspired this work: a home patient monitoring system (HPMS) offered to hospitals as a SaaS application.Next to the HPMS, the hospital also employs several on-premise applications (e.g., for employee management) and several other off-premise SaaSapplications (e.g., for medical imaging).
Figure 4 Representation of the example policies of Section 3.2 as a policy tree using our policy model.
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