Prism is a secret sharing based approach to compute privateset operations (i.e., intersection and union), as well as aggregates overoutsourced databases belonging to multiple owners . Prism enables data owners topre-load the data onto non-colluding servers and exploits the additive and multiplicative properties of secret-shares to compute the above-listedoperations in (at most) two rounds of communication between the servers and the querier . Prism scales both interms of the number of data owners and database sizes, to which prior approaches do not scale .

Author(s) : Yin Li, Dhrubajyoti Ghosh, Peeyush Gupta, Sharad Mehrotra, Nisha Panwar, Shantanu Sharma

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Keywords : prism - data - owners - databases - secret -

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