7 Conclusion
Security, anonymity and efciency are the most concerned issues in mobile payment. Among prevailing payment systems, PayPal has a serious privacy leakage issue, the same as Alipay. Bitcoin provides anonymity. But high energy consumption and security threats become its weaknesses. And it does not have strong anonymity.
We propose a SATP scheme, where a ticket, as a way of payment, is partially blindly signed by TPP. No matter TPP, a payee or a malicious user, no one can know the identity of a payer from transaction messages. Moreover, if the payer does not receive the requested service, he can revoke the payment. Our mobile payment scheme has confdentiality, unforgeability, strong anonymity and revocation. Since no public key certifcate is required, it has clear communication advantage. Security analysis and performance analysis show that SATP has high security and it can be applied in mobile payment efciently.