Abstract: By combining the advantages of a blind signature with a proxy signature, a proxy blind signature can be widely applied in the electronic cash. However, in most of electronic cash system based proxy blind signature, electronic cash amount was invisible. And a malicious user forged the tracking information. So these schemes didn’t meet practicability and no double spending. The paper proposes a proxy partially-blind signature based bilinear parings. The signature is unforgeable under the Computational Diffie-Hellman assumption. On the basis of the new proxy partially-blind signature and signature of knowledge, this manuscript proposes an electronic cash scheme. The scheme can prevent a malicious forgery of tracking information and achieved double-spending detection. Analysis shows that the proposed scheme can satisfy no double spending, unforgeability, anonymity and practicality.

Key words:  electronic cash, proxy partially-blind, signature of knowledge, double-spending detection