Write-Only Oblivious RAM based Privacy-Preserved Access of Outsourced Data.
Lichun Li, Anwitaman Datta · 2013
Oblivious RAM (ORAM) has recently attracted a lot of interest since it can be used to protect the privacy of data user’s data access pattern from (honest but curious) outsourced storage. This is achieved by simulating each original data read or write operation with some read and write operations on some real and dummy data items. This paper proposes two single-server writeonly ORAM schemes and one multi-server write-only ORAM scheme, which simulate only the write operations and protect only the write pattern. The reduction of functions however allows to build much simpler and efficient (in terms of communication cost and storage usage) write-only ORAMs. Write-only ORAM can be used in conjunction with Private Information Retrieval (PIR), which is a technique to protect data user’s read patterns, in order to protect both write and read patterns. Write-only ORAM may be used alone too, when only write patterns need protection. We study two usage scenarios: (i) data publishing/sharing: where a data owner shares the data with others, who only consume the published information. Data consumers should not have write access to the outsourced data, and thus cannot use ORAM to protect their read patterns in this scenario. To hide access patterns from the outsourced storage, the data owner can use ORAM to write data,