Multi-Party Identity-Based Symmetric Privacy-Preserving Matching with Cloud Storage

摘要

In this paper,we address the problem of multi-party privacy-preserving matching(PPM)over the encrypted data.We firstly construct an efficient identity-based re-encryption scheme like ElGmal(IBR-ElGmal)using combined public keys,which not only ensures the privacy of the information during the transmission process but also holds perfect multiplicative homomorphic property.Then we construct a multi-party identity-based symmetric privacy-preserving matching(M-IBSPM)protocol based on IBR-ElGmal scheme in cloud environments,which realizes the privacy-preserving matching among multiple different parties as well as getting the symmetric output.Furthermore,with our M-IBSPM protocol,most of the computation costs are taken over by cloud service provider without leaking any privacy,and our protocol achieves perfect security and privacy in the semi-honest model.Finally,we analyze the efficiency for our protocol.