An off-line electronic cash system with multiple banks
Secure and efficient electronic payment systems are significant for electronic commerce. Fangguo [9] proposed a fair electronic cash system with multiple banks based on a group signature scheme of Camenisch [5] and the group blind signature scheme of Lysyanskaya [11]. Ateniese proved in [1] that these group signature schemes does not satisfy the property of coalition-resistance. In this paper we extend the electronic cash system of Fangguo by using a secure coalition-resistant group blind signature scheme. The main benefits of our off-line electronic cash system, compared to the scheme of Fangguo; relate to the underlying group signature scheme's improved efficiency and provable security.
electronic cash system group blind signatures cryptography