Abstract:

The current micropayment protocols are analyzed and it is found that there exist security problems. A new mobile micropayment protocol based on chaotic dual Hash chains is proposed. This protocol is mainly developed for the demand of lower value network information service charge. It utilizes the one way character of the interaction process of Hénonlike chaotic system to construct two Payword chains. One Payword chain is used to charge merchants and the other Payword chain is used to charge users. The protocol possesses the character of anonymity that the information ordered by users is of confidentiality and it provides partial fairness character. Analysis demonstrates that the protocol has higher security and faster operation efficiency, and it is suitable for the micropayment transactions with very small trade amount and only partial fairness requirement.

Key words: communication, chaotic cryptography, mobile micropayment, Hash chain, payword