Practical and malicious private set intersection with improved efficiency

Abstract

We propose a novel two-party private set intersection (PSI) protocol, which achieves ideal and constant receiver-to-sender and linear sender-to-receiver communication overhead, linear computational complexity, along with receiver size-hiding and lightweight computation cost. In comparison with other PSI protocols, the proposed protocol is more practical as it does not require any fully homomorphic computation. We propose three variants to demonstrate efficiency optimization, size-hiding feature extension, and online/offline settings for real-world applications, respectively, to offer a practical control between security and efficiency. Finally, we prove that our proposed protocols are secure against malicious participants under our security model.