Privacy-preserving queries over relational databases
PETS'10 Proceedings of the 10th international conference on Privacy enhancing technologies
Achieving efficient query privacy for location based services
PETS'10 Proceedings of the 10th international conference on Privacy enhancing technologies
Round-efficient oblivious database manipulation
ISC'11 Proceedings of the 14th international conference on Information security
Optimally robust private information retrieval
Security'12 Proceedings of the 21st USENIX conference on Security symposium
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An information-theoretic private information retrieval (PIR) protocol allows a user to retrieve a data item of its choice from a database replicated amongst several servers, such that each server gains absolutely no information on the identity of the item being retrieved. One problem with this approach is that current systems do not guarantee availability of servers at all times for many reasons, e.g., crash of server or communication problems. In this work we design robust PIR protocols, i.e., protocols which still work correctly even if only some servers are available during the protocol's operation. We present various robust PIR protocols giving different tradeoffs between the different parameters. We first present a generic transformation from regular PIR protocols to robust PIR protocols. We then present two constructions of specific robust PIR protocols. Finally, we construct robust PIR protocols which can tolerate Byzantine servers, i.e., robust PIR protocols which still work in the presence of malicious servers or servers with a corrupted or obsolete database.