多方全同态加密研究进展OA北大核心CSTPCD

Fully homomorphic encryption(FHE)supports computation on ciphertexts directly,guaranteeing the security and privacy of sensitive information operated in untrusted environments.To make it adapt to joint computation scenarios where private data are provided by multiple data owners,the problem of fully homomorphic encryption under multiple parties has attracted much attention.In the last decade,a large number of related work were published.The main technical lines are classified into threshold FHE,multi-key FHE,and multi-group FHE.Meanwhile,the development of multi-party FHE has further promoted progress in secure multiparty computation.In this paper,starting from traditional single-key FHE,the frontier progress of multi-party FHE is systematically and comprehensively overviewed,and the representative constructions are described in detail.Finally,an overall analysis of existing research is presented and the issues are summarized.