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Computational Private Information Retrieval (cPIR) protocols allow a client to retrieve one bit from a database, without the server inferring any information about the queried bit. These protocols are too costly in practice because they invoke complex arithmetic operations for every bit of the database. The authors' approach assumes a disk-based architecture that retrieves one page with a single query. Their results indicate that pCloud reduces considerably the query response time compared to the traditional client/server model, and has a very low communication overhead. Additionally, it scales well with an increasing number of peers; achieving a linear speedup Data outsourcing is a new paradigm in which a third party provides storage services.
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