Physical Sciences and Mathematics Commons^™

Database Access Pattern Protection Without Full-Shuffles, Xuhua Ding, Yanjiang Yang, Robert H. Deng

Research Collection School Of Computing and Information Systems

Privacy protection is one of the fundamental security requirements for database outsourcing. A major threat is information leakage from database access patterns generated by query executions. The standard private information retrieval (PIR) schemes, which are widely regarded as theoretical solutions, entail O(n) computational overhead per query for a database with items. Recent works propose to protect access patterns by introducing a trusted component with constant storage size. The resulting privacy assurance is as strong as PIR, though with O(1) online computation cost, they still have O(n) amortized cost per query due to periodically full database shuffles. In this paper, we …