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(27)

A．用户对自己证书签名
B．用户对发送报文签名
C．发证机构对用户证书的签名
D．发证机构对发送报文的签名

试题出自试卷《软件水平考试（中级）网络工程师上午（基础知识）试题模拟试卷3》

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