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Dynamic searchable symmetric encryption (DSSE) is a useful cryptographic toolin encrypted cloud storage. However, it has been reported that DSSE usuallysuffers from file-injection attacks and content leak of deleted documents. Tomitigate these attacks, forward privacy and backward privacy have beenproposed. Nevertheless, the existing forward/backward-private DSSE schemes canonly support single keyword queries. To address this problem, in this paper, wepropose two DSSE schemes supporting range queries. One is forward-private andsupports a large number of documents. The other can achieve backward privacy,while it can only support a limited number of documents. Finally, we also givethe security proofs of the proposed DSSE schemes in the random oracle model.

Dynamic Searchable Symmetric Encryption Schemes Supporting Range Queries with Forward/Backward Privacy