某数字签名系统如下图所示。网上传送的报文是（请作答此空），如果A否认发送，作为证据的是（ ）。
- A.P
- B.DA(P)
- C.EB(DA(P))
- D.DA
正确答案及解析
正确答案
解析
本题考查数字签名的实现细节。
图中所示为一种利用公钥加密算法实现的数字签名方案，发送方A要发送给接收方B的报文P经过A的私钥签名和B的公钥加密后形成报文EB(DA(P))发送给B，B利用自己的私钥DB和A的公钥EA对消息EB(DA(P))进行解密和认证后得到报文P，并且保存经过A签名的消息DA(P)作为防止A抵赖的证据。
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