A secure electronic payment protocol based on bank account

Bank account based electronic payment systems is more important for electronic commerce in the erea where credit card is not popular A new secure electronic payment protocol based on bank account is present, which is compatible to current Internet and financial infrastructures. It is similar to iKP but deferent. With only four information transfer flows the protocol can fulfill the payment functions that iKP could do with six that flows. Meanwhile our protocol satisfies all security requirements which 3KP can do. And then the translation cost, calculation cost,and transfer delay are decreased.