Thank you __ for inviting me. [ ]
A. so many
B. lot many
C. so much
D. as much
答案:C
如果发送者利用自己的私钥对要传送的数据实现加密密,接收者以发送者的公钥对数据进行解密,这种技术能够实现______。
A.数字签名
B.防止篡改
C.数据加密
D.以上都能实现