"Verifiable Searchable Symmetric Encryption for Conjunctive Keyword Queries in Cloud Storage"
Searchable Symmetric Encryption (SSE) enables secure outsourcing of encrypted databases to cloud storage, while maintaining searchable features. Most of the various SSE schemes assume the server is honest but curious, while the server could be trustless in the real world. Given the possibility of a malicious server not performing the queries honestly, Verifiable SSE (VSSE) techniques are designed to guarantee the verifiability of the search results. Existing VSSE schemes, on the other hand, are either limited to single-keyword searches or suffer high computational costs during verification. Therefore, a research team led by Joseph K. Liu, has proposed a new VSSE construction that supports conjunctive keyword queries, which is an improvement of a recent VSSE solution. The team's proposed VSSE scheme is based on a privacy-preserving hash-based accumulator, using Symmetric Hidden Vector Encryption (SHVE), a well-established cryptographic primitive. This article continues to discuss SSE schemes, VSSE schemes, and the new proposed VSSE construction for conjunctive keyword queries in cloud storage.