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%安全电子交易协议缺乏隐私保护,尤其是持卡人身份对商家的匿名.为了增强安全电子交易协议匿名性保护,提出一种安全电子交易协议匿名性改进方案,由认证中心(Certificate Authority)在持卡人(Cardholder)的数字证书中,用持卡人身份信息的消息摘要代替身份信息；在持卡人(Cardholder)、经销商(Merchant)、支付网关(Payment Gateway)三个参与方的基础上引入了物流公司(Express)；持卡人发送订购信息给商家,商家发送物流信息给物流公司,由物流公司邮递商品给持卡人,结合数字签名和数字信封技术,实现持卡人身份对商家的匿名.
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