Security and experimental performance analysis of a matrix ORAM

Oblivious RAM can hide a client's access pattern from an untrusted storage server. However current ORAM schemes incur a large communication overhead and/or client storage overhead, especially as the server storage size grows. We have proposed a matrix-based ORAM, M-ORAM, that makes the communication overhead independent of the server size. This requires selecting a height of the matrix; we present how to select the height to match the functionality of the well-known Path ORAM. We then given both theoretical models and experimental results that show M-ORAM can achieve a lower communication overhead than Path ORAM, without a significant increase in maximum client storage overhead.