Searchable encryption (SE) is a promising technique which enables cloud users to conductsearch over encrypted cloud data in a privacy-preserving way, especially for the electronichealth record (EHR) system that contains plenty of medical history, diagnosis, radiologyimages, etc. In this paper, we focus on a more practical scenario, also named as theshared multi-owner settings, where each e-health record is co-owned by a fixed numberof parties. Although the existing SE schemes under the unshared multi-owner settingscan be adapted to this shared scenario, these schemes have to build multiple indexes,which definitely incur higher computational overhead. To save bandwidth and computingresources in cloud servers and guarantee the correctness of search results, we present asecure cryptographic primitive, namely verifiable conjunctive keyword search over mobilee-health cloud scheme, in the shared multi-owner settings by utilizing multisignaturestechnique. Formal security analysis proves that our scheme is secure against the keywordguessing attacks in standard model. Empirical study using a real-world dataset justifies thatour scheme is efficient and feasible in practical applications.
Searchable encryption, Multi-owner settings, Conjunctive keyword, Correctness, Keyword guessing attacks
OS and Networks | Programming Languages and Compilers
Pervasive and Mobile Computing
MIAO, Yinbin; MA, Jianfeng; and LIU, Ximeng.
VCKSM: Verifiable conjunctive keyword search over mobile e-health cloud in shared multi-owner settings. (2017). Pervasive and Mobile Computing. 40, 205-219. Research Collection School Of Information Systems.
Available at: http://ink.library.smu.edu.sg/sis_research/3677
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