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Peer-to-peer overlays provide a substrate well suited to building distributed storage systems. Applications that use the infrastructure need the ability to control access to their data. However, traditional authorization services were not designed to operate in the face of network partitions, malicious nodes, and on an Internet-wide scale. The authors describe the implementation of the Decentralized Authentication and Authorization Layer (DAAL), a mechanism to leverage the storage functionality of the overlay and obviate the need for an online, centralized access control service.
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