Multi-user Searchable Encryption with Coarser-Grained Access Control without Key Sharing
Qinqin Wang, Yanqin Zhu, Xizhao Luo · 2014
Searchable encryption(SE) schemes allow users to perform keyword search on encrypted data without leakage of the sensitive information. Most of the existing SE schemes are limited to single-user setting where a user acts as both the data owner and the data retriever. However, the data-sharing environment drives multiple users to access the same data sets. To bridge this gap, we consider searchable encryption under multi-user setting in this paper. We focus on tackling the challenge of dynamical user injection and revocation by maintaining a complementary key list in the public cloud. Furthermore, a method based on key relevance to solve the problem of key sharing is present here. Our scheme achieves coarser-grained access control in hybrid cloud, and security analysis shows that our scheme is secure.