PrivateFS is an oblivious file system that enables access to remote storage, while keeping both the file contents and client access patterns secret. PrivateFS is based on a new parallel Oblivious RAM mechanism (PD-ORAM)---instead of waiting for the completion of all ongoing client-server transactions, client threads can now engage a server in parallel without loss of privacy.
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Williams et al. (2012) studied this question.
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