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Multi-Database Classical Symmetric Private Information Retrieval with Quantum Key Distribution
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==Outline== <!-- A non-mathematical detailed outline which provides a rough idea of the concerned protocol --> Outline for a generic one-round two-database SPIR protocol with QKD:<br></br> ''There are three parties, a user and two data centres. Each data centre has a copy of the database. In symmetric private information retrieval, the user wants to retrieve an element from a database owned by another party (here, two other parties: data centres 1 and 2) without revealing which element is retrieved; the user should not have access to other database elements.'' * '''Sharing secret keys between parties:''' At the beginning of the protocol, for each pair of parties (i.e., user and data centre 1, data centre 1 and data centre 2, user and data centre 2), shared secret keys are established via a single round of [[Quantum Key Distribution|quantum key distribution]]. If any of the key distribution protocols abort, then the whole SPIR protocol aborts. The next steps are the same as these of a generic one-round two-database classical SPIR protocol. * '''Query:''' Then, the user generates two queries; one for each data centre. Queries are some encryptions of the index of the desired database element using some local randomness. * '''Answer:''' From the queries received, their copy of the database, and their secret key shared with the user, each data centre generates an answer and sends it to the user. * '''Retrieval:''' Lastly, the user can reconstruct the desired database element from the answers of each datacentre and his own inputs.
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