简述SET安全保障措施的技术基础。
(1)通过加密方式确保信息机密性;(2)通过数字签名确保数据的完整性;(3)通过数字签名和商家认证确保交易各方身份的真实性:(4)通过特殊的协议和消息形式确保动态交互式系统的可操作性。
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