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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.

The Electronic Cash Protocol Based on Dynamic Group Signature