Theory Lunch Seminar

Wednesday, November 18, 2015 - 12:00pm to 1:00pm

Location:

ASA Conference Room 6115 Gates & Hillman Centers

Speaker:

SIVAKANTH GOPI, Ph.D. Student http://www.cs.princeton.edu/~sgopi/

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. — Sivakanth Gopi is a third year graduate student at Princeton University advised by Zeev Dvir. His research interests include Complexity Theory, Coding Theory and Pseudorandomness.

Event Website:

http://www.cs.cmu.edu/~theorylunch/20151118.html

For More Information, Contact:

dwajc@cs.cmu.edu

Keywords:

Seminar Series