数字签名主要功能不包括（ ）。
- A.保证信息传输完整性
- B.防止交易中抵赖发生
- C.实现发送者身份认证
- D.防止数据在传输过程中被窃取
正确答案及解析
正确答案
解析
本题考查数字签名基本概念。数字签名技术是将摘要用发送者私钥加密，与原文一起传送给接收者。接收者只有用发送者公钥才能解密得到被加密摘要。数字签名技术可以保证接收者不能伪造对报文签名、接收者能够核实发送者对报文签名、发送者事后不能抵赖对报文签名。同时，接收者可以用Hash函数对收到原文再产生一个摘要，与收到摘要对比，如果二者相同，则说明收到信息是完整，从而保证信息传输完整性。但是，数字签名技术不是加密技术，它不能防止数据在传输过程中被窃取。
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