TY - GEN
T1 - Information-theoretic Private Information Retrieval
T2 - 28th International Colloquium on Automata, Languages and Programming, ICALP 2001
AU - Beimel, Amos
AU - Ishai, Yuval
PY - 2001/1/1
Y1 - 2001/1/1
N2 - A Private Information Retrieval (PIR) protocol enables a user to retrieve a data item from a database while hiding the identity of the item being retrieved. In a t-private, k-server PIR protocol the database is replicated among k servers, and the user's privacy is protected from any collusion of up to t servers. The main cost-measure of such protocols is the communication complexity of retrieving a single bit of data. This work addresses the information-theoretic setting for PIR, in which the user's privacy should be unconditionally protected from collusions of servers. We present a unified general construction, whose abstract components can be instantiated to yield both old and new families of PIR protocols. A main ingredient in the new protocols is a generalization of a solution by Babai, Kimmel, and Lokam to a communication complexity problem in the so-called simultaneous messages model. Our construction strictly improves upon previous constructions and resolves some previous anomalies. In particular, we obtain: (1) t-private k-server PIR protocols with O(n1/b(2k-1)/t) communication bits, where n is the database size. For t < 1, this is a substantial asymptotic improvement over the previous state of the art; (2) a constant-factor improvement in the communication complexity of 1-private PIR, providing the first improvement to the 2-server case since PIR protocols were introduced; (3) effcient PIR protocols with logarithmic query length. The latter protocols have applications to the construction of effcient families of locally decodable codes over large alphabets and to PIR protocols with reduced work by the servers.
AB - A Private Information Retrieval (PIR) protocol enables a user to retrieve a data item from a database while hiding the identity of the item being retrieved. In a t-private, k-server PIR protocol the database is replicated among k servers, and the user's privacy is protected from any collusion of up to t servers. The main cost-measure of such protocols is the communication complexity of retrieving a single bit of data. This work addresses the information-theoretic setting for PIR, in which the user's privacy should be unconditionally protected from collusions of servers. We present a unified general construction, whose abstract components can be instantiated to yield both old and new families of PIR protocols. A main ingredient in the new protocols is a generalization of a solution by Babai, Kimmel, and Lokam to a communication complexity problem in the so-called simultaneous messages model. Our construction strictly improves upon previous constructions and resolves some previous anomalies. In particular, we obtain: (1) t-private k-server PIR protocols with O(n1/b(2k-1)/t) communication bits, where n is the database size. For t < 1, this is a substantial asymptotic improvement over the previous state of the art; (2) a constant-factor improvement in the communication complexity of 1-private PIR, providing the first improvement to the 2-server case since PIR protocols were introduced; (3) effcient PIR protocols with logarithmic query length. The latter protocols have applications to the construction of effcient families of locally decodable codes over large alphabets and to PIR protocols with reduced work by the servers.
UR - http://www.scopus.com/inward/record.url?scp=84879524288&partnerID=8YFLogxK
U2 - 10.1007/3-540-48224-5_74
DO - 10.1007/3-540-48224-5_74
M3 - Conference contribution
AN - SCOPUS:84879524288
SN - 3540422870
SN - 9783540422877
T3 - Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
SP - 912
EP - 926
BT - Automata, Languages and Programming - 28th International Colloquium, ICALP 2001, Proceedings
A2 - Orejas, Fernando
A2 - Spirakis, Paul G.
A2 - van Leeuwen, Jan
PB - Springer Verlag
Y2 - 8 July 2001 through 12 July 2001
ER -