Private Information Retrieval with 2-Servers and sub-polynomial communication

Speaker: Zeev Dvir

Date: Tuesday, October 07, 2014

Time: 4:15 PM to 5:15 PM Note: all times are in the Eastern Time Zone

Refreshments: 3:45 PM

Public: Yes

Location: G882 (Hewlett Rm)

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Host: Costis Daskalakis, Ankur Moitra, Dana Moshkovitz and Vinod Vaikuntanathan, MIT, CSAIL

Contact: Deborah Lehto, 617.324.7303, dlehto@csail.mit.edu

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Reminders to: cis-seminars@csail.mit.edu, seminars@csail.mit.edu

Reminder Subject: TALK: Zeev Dvir, Talk: Private Information Retrieval with 2-Servers and sub-polynomial communication

Abstract: A 2-server Private Information Retrieval (PIR) scheme allows a user to retrieve the i'th bit of an n-bit database replicated among two servers (which do not communicate) while not revealing any information about i to either server. The privacy of the user is information theoretic and does not rely on any cryptographic assumptions. In this work we construct a new 2-server PIR scheme with total communication cost sub-polynomial in n. This improves over the currently known 2-server protocols which require n^{1/3} communication and matches the communication cost of known 3-server PIR schemes. Our improvement comes from reducing the number of servers in existing protocols, based on Matching Vector Codes, from 3 or 4 servers to 2. This is achieved by viewing these protocols in an algebraic way (using polynomial interpolation) and extending them using partial derivatives.

Joint work with Shivakanth Gopi (Princeton)

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Created by Deborah Goodwin Email at Friday, September 26, 2014 at 9:07 AM.