A constant-size linkable ring signature scheme for e-cash protocol

The ring signature can guarantee the signer´s anonymity. Most proposed ring signature schemes have the problem that the size of ring signature depends linearly on the ring size. Some authors have studied the constant-size ring signature. Based on bilinear pairings and an improved accumulators, a new constant-size id-based linkable ring signature scheme is proposed. We apply our linkable ring signature scheme to a e-cash system with identity tracing.