Paper 2018/628

Dynamic Searchable Symmetric Encryption Schemes Supporting Range Queries with Forward (and Backward) Security

Cong Zuo, Shi-Feng Sun, Joseph K. Liu, Jun Shao, and Josef Pieprzyk

Abstract

Dynamic searchable symmetric encryption (DSSE) is a useful cryptographic tool in the encrypted cloud storage. However, it has been reported that DSSE usually suffers from the file-injection attacks and content leak of deleted documents. To mitigate these attacks, forward security and backward security have been proposed. Nevertheless, the existing forward/backward-secure DSSE schemes can only support single keyword queries. To address this problem, in this paper, we propose two DSSE schemes supporting range queries. One is forward-secure and supports a large number of documents. The other can achieve both forward security and backward security, while it can only support a limited number of documents. Finally, we also give the security proofs of the proposed DSSE schemes in the random oracle model.