A Fair Off-line Electronic Cash Scheme Based on RSA Partially Blind Signature

Current fair electronic cash schemes are mostly based on discrete logarithm problem on finite field or elliptic curve over finite field. However, the RSA is widely accepted as the industrial standard in practice. It is important to study how to construct an efficient fair electronic cash scheme based on the RSA cryptosystem from both a practical perspective and a pure research issue. In this paper, a simple and efficient fair electronic cash scheme is presented using RSA partially blind signature as a building block. The partially blind property aids in the practical deployment of electronic cash schemes as it allows for the easy implementation of coin expiration date and multiple coin face values. Furthermore, the fair property allows a trustee to revoke anonymity under a warrant, thus prevents crime such as blackmailing, money laundering and illegal purchase