Proxy Blind Signature Scheme and Its Application to Electronic Cash

A new signature scheme is designed with a combination of proxy signature and blind signature, namely proxy blind signature scheme.The new scheme can resolve some difficult problems in the electronic cash application, mainly embodying three improvements: (1) partiall blindsignature; (2) manifold electronic cashes are generated with the same public key; (3) it is easy to confirm the period of electronic cash validity.