A Secure Electronic Payment System Based on Efficient Public Key Infrastructure

At present, electronic payment activities constructed on the Internet mainly employ the certificate-based public key cryptosystems to solve related security issues. But it is based on the condition that the certificate authority (CA) must be honest and needs to manage the key directory. Furthermore, it needs to spend extra time to verify the signature signed in the digital certificate by the CA. For the considerations of efficiency, a secure electronic payment system proposed in this paper is developed by using elliptic curve cryptosystems (ECC) instead of modular exponentiation schemes, because ECC possess fewer bits achieving the same security level as other public key cryptosystems. In this paper we have designed a session key exchange scheme and a blind signature scheme for the e-cash based payment systems using the self-certified public key cryptosystems based on ECC. In summary, the proposed efficient self-certified public key cryptosystems make the on-line electronic payment system securely workable.