Privacy-Preserving Multi-party Aggregate Signcryption for Heterogeneous Systems

Abstract

To achieve heterogeneous communication from certificateless cryptography (CLC) to identity-based cryptography (IBC), we present a heterogeneous scheme that enables m senders in the CLC to transmit m message to n receivers in the IBC. In the proposed signcryption scheme, each sender is mapped to a distinct pseudo identity, so the sender’s identity privacy preservation can be guaranteed. At the same time, to ensure the receiver’s identity privacy, the identity information of all authorized recipients is mixed by the Lagrange interpolation polynomial during the signcryption process, which prevents the receiver’s identity from being exposed. Compared with existing schemes, the proposed scheme presents efficient computational overhead and is suitable for heterogeneous environments. In addition, our scheme has the indistinguishability against adaptive chosen ciphertext attacks and existential unforgeability against adaptive chosen-message attacks in the random oracle model.