An Efficient PIR Construction Using Trusted Hardware

Authors:
Yanjiang Yang;Xuhua Ding;Robert H. Deng;Feng Bao
Affiliations:
School of Information Systems, Singapore Management University, Singapore 178902 and Institute for Infocomm Research, Singapore 119613;School of Information Systems, Singapore Management University, Singapore 178902;School of Information Systems, Singapore Management University, Singapore 178902;Institute for Infocomm Research, Singapore 119613
Venue:
ISC '08 Proceedings of the 11th international conference on Information Security
Year:
2008

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Abstract

For a private information retrieval (PIR) scheme to be deployed in practice, low communication complexity and low computation complexity are two fundamental requirements it must meet. Most existing PIR schemes only focus on the communication complexity. The reduction on the computational complexity did not receive the due treatment mainly because of its O(n) lower bound. By using the trusted hardware based model, we design a novel scheme which breaks this barrier. With constant storage, the computation complexity of our scheme, including offline computation, is linear to the number of queries and is bounded by ${\mathrm{O}}(\sqrt{n})$ after optimization.