Single-round Lattice-based Multisignatures

Abstract

This work presents a provably-secure lattice-based multisignature scheme which requires only a single round of communication, whereas the existing works need two or three rounds. The reduction in the number of rounds for the proposed scheme is achieved by utilizing lattice trapdoors. In order to generate multisignatures securely, our scheme however requires an honest centralized server that maintains the trapdoor of a shared matrix used in the scheme.