For further details contact: N.RAJASEKARAN B.E M.S 9841091117,9840103301. IMPULSE TECHNOLOGIES, Old No 251, New No 304, 2nd Floor, Arcot road , Vadapalani , Chennai-26. www.impulse.net.in Email: ieeeprojects@yahoo.com/ imbpulse@gmail.com

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PCloud: A Distributed System for Practical PIR
Abstract—
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. In this paper, we
present pCloud, a distributed system that constitutes the first attempt toward
practical cPIR. Our approach assumes a disk-based architecture that retrieves one
page with a single query. Using a striping technique, we distribute the database to a
number of cooperative peers, and leverage their computational resources to process
cPIR queries in parallel. We implemented pCloud on the Planet Lab network, and
experimented extensively with several system parameters. Our 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.
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