2-Server PIR with Sub-Polynomial Communication

@article{Dvir20142ServerPW,
  title={2-Server PIR with Sub-Polynomial Communication},
  author={Zeev Dvir and Sivakanth Gopi},
  journal={Proceedings of the forty-seventh annual ACM symposium on Theory of Computing},
  year={2014}
}
  • Zeev Dvir, Sivakanth Gopi
  • Published 24 July 2014
  • Computer Science, Mathematics
  • Proceedings of the forty-seventh annual ACM symposium on Theory of Computing
A 2-server Private Information Retrieval (PIR) scheme allows a user to retrieve the ith bit of an n-bit database replicated among two non-communicating servers, while not revealing any information about i to either server. In this work we construct a 2-server PIR scheme with total communication cost nO√(log log n)/(log n). This improves over current 2-server protocols which all require Ω(n1/3) communication. Our construction circumvents the n1/3 barrier of Razborov and Yekhanin which holds for… 
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