The Electronic Cash Protocol Based on Dynamic Group Signature

Due to the increasingly serious information attacks in network times, the electronic commerce is facing additional challenges in the aspects of security and efficiency. Therefore, in this paper, we propose a new practical e-cash protocol based on dynamic group signature in BSZ model, using the NonInteractive Zero-Knowledge proofs system. And it is proved that our protocol satisfies anonymity which resists chosen-ciphertext attack, unforgeability, traceability, and no double-spending without random oracles. Compared with the existing protocols, our protocol not only permits dynamic enrollment of members and non-interactive during transmission, but also offers lower storage and communication cost.