Beyond Volume Pattern: Storage-Efficient Boolean Searchable Symmetric Encryption with Suppressed Leakage

Feng Li, Jianfeng Ma, Yinbin Miao, Pengfei Wu, Xiangfu Song

Abstract: Boolean Searchable Symmetric Encryption (BSSE) enables users to perform retrieval operations on the encrypted data while supporting complex query capabilities. This paper focuses on addressing the storage overhead and privacy concerns associated with existing BSSE schemes. While Patel et al. (ASIACRYPT’21) and Bag et al. (PETS’23) introduced BSSE schemes that conceal the number of single keyword results, both of them suffer from quadratic storage overhead and neglect the privacy of search and access patterns. Consequently, an open question arises: Can we design a storage-efficient Boolean query scheme that effectively suppresses leakage, covering not only the volume pattern for singleton keywords, but also search and access patterns?