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摘要


The scheme [IEEE Trans. Computers, 65(5), 2016, 1566-1577] aims to enable cloud servers to perform secure search without knowing the actual contents of both keywords and trapdoors in the scenario of multi-owners and multi-users. To rank the search results and preserve the privacy of relevance scores between keywords and files, it needs to construct an Additive Order and Privacy Preserving Function family. In this paper, we show that the proposed construction is awed, because the basic order and privacy preserving function is not well-defined. The univariate recurrence equation only generates a trivial linear transformation. It neglected the fact that an order preserving encryption was generally believed to be insecure because it was quite vulnerable to statistical attack.

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