An anonymity improvement scheme of Secure Electronic Transactions protocols

Secure Electronic Transaction lacks of the privacy protection, especially the anonymous identity of the cardholder to the merchant. To improve the privacy protection, this article proposes an anonymity improvement scheme of SET protocols. It has the following highlights: Certificate Authority writes the message digest of the cardholder´s identity information instead of the cardholder identity information into the cardholder digital certificate; the express company participates in electronic trade process; the information for the merchant doesn´t have the cardholder identity information, but the information for the express company has. At the same time, the Merchant and express company can respectively finish tasks with the necessary information. This scheme can provide anonymous identity of the cardholder to the merchant.