Oblivious RAM is a well-known cryptographic primitive to
\nhide data access patterns. However, the best known ORAM
\nschemes require a logarithmic computation time in the general
\ncase which makes it infeasible for use in real-world applications. In practice, hiding data access patterns should incur a
\nconstant latency per access.
\nIn this work, we present PRO-ORAM\u2014 an ORAM construction that achieves constant latencies per access in a large class
\nof applications. PRO-ORAM theoretically and empirically guarantees this for read-only data access patterns, wherein data is
\nwritten once followed by read requests. It makes hiding data
\naccess pattern practical for read-only workloads, incurring
\nsub-second computational latencies per access for data blocks
\nof 256 KB, over large (gigabyte-sized) datasets. PRO-ORAM
\nsupports throughputs of tens to hundreds of MBps for fetching blocks, which exceeds network bandwidth available to
\naverage users today. Our experiments suggest that dominant
\nfactor in latency offered by PRO-ORAM is the inherent network
\nthroughput of transferring final blocks, rather than the computational latencies of the protocol. At its heart, PRO-ORAM
\nutilizes key observations enabling an aggressively parallelized
\nalgorithm of an ORAM construction and a permutation operation, as well as the use of trusted computing technique (SGX)
\nthat not only provides safety but also offers the advantage of
\nlowering communication costs.<\/p>\n","protected":false},"excerpt":{"rendered":"
Oblivious RAM is a well-known cryptographic primitive to hide data access patterns. However, the best known ORAM schemes require a logarithmic computation time in the general case which makes it infeasible for use in real-world applications. In practice, hiding data access patterns should incur a constant latency per access. In this work, we present PRO-ORAM\u2014 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