A new efficient mobile micropayment scheme

This paper proposes a micropayment scheme designed for GSM mobile scenario, where the overload of computation, storage and communication for mobile phone is reduced by directing operations normally performed by the mobile user to the static portion of the network in view of its limited capability. Messages which received and sent during the payment are very simple and public key infrastructure is not needed, which reduces delay and removes the possibility of incomplete payment due to communications failures. Furthermore, all the information related to payment is encrypted by a shared symmetric key in our scheme, so the privacy of the mobile user is protected and the security of information is guaranteed. Compared with other mobile micropayment schemes in existence, no public-key operation is required, which minimizes the computation and storage overhead dramatically. In addition, restricted anonymous is also provided in our scheme.