An efficient and divisible payment scheme for M-commerce

Almost all of the mobile devices have some fixed characters which can be distinguished easily, and also they are so portable that can be taken with yourself, so the mobile device which is used in electronic business is always the same, as the result, electronic cash, consumer and mobile device can be tied together, and we can check whether the cash belongs to the user by authenticating the fixed character of the mobile device. In this paper, a portable and divisible electronic payment scheme is presented under the idea above, whose computational load, storage needed and network load are all light, so it is fit for mobile commerce. In addition, an augmented dynamic password identity authentication scheme is given after disclosing the hidden security trouble of SDPA. Meanwhile, a new identity-based digital signature scheme is proposed.