关键词: 移动支付, 同时生效签名, 公平性, 不可否认性

Abstract: In order to solve the problem of fair transaction in mobile payment, this paper proposes a mobile payment protocol without a trusted third part (TTP) based on a concurrent signature scheme, in which both the benefits of customers and merchants can be protected and the conspiracy problem can be avoided. The protocol possesses the characters of fairness and non-repudiation. At the same time, the scheme can avoid network congestion brought by a traditional TTP, and it can be applied to the trade of digital products in mobile environment.

Key words: mobile payment, concurrent signatures, fairness, non-repudiation