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【多选题】
下列说法中正确的是A.
身份认证是判明和确认贸易双方真实身份和重要环节
B.
SET是提供公钥加密和数字签名服务的平台
C.
不可抵赖性是认证机构或信息服务商应当提供的认证功能之一
D.
身份认证要求对数据和信息的来源进行验证
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