Efficient fair electronic cash scheme

For its anonymity and anonymous control functions,group signature scheme acts as an important tool for the designation of fair electronic cash scheme.In order to design a secure and efficient fair E-cash scheme,a fair electronic cash system is proposed by adding a one-time tag to an efficient and provable security group signature(CG group signature).The system has good properties: supporting cash tracing and owner tracing;meeting unforgeability and anonymity under standard assumptions;possessing higher efficiency than other E-cash systems.