更多"[单选题]Has Alice had an accident? ___"的相关试题:
[简答题] He had a traffic accident last week.
[单选题] 若 Bob 给 Alice 发送一封邮件, 并想让 Alice 确信邮件是由 Bob 发出的, 则 Bob 应该选 用( )对邮件加密。
A. Alice 的公钥
B. Alice 的私钥
C. Bob 的公钥
D. Bob 的私钥
[单选题]若Bob给Alice发送一封邮件，并想让Alice确信邮件是由Bob发出的，则Bob应该选用（）对邮件签名。
A.Alice的公钥
B.Alice的私钥
C.Bob的公钥
D.Bob的私钥
[单选题]________ she survived the accident is miracle.
A. What
B. That
C. As
D. Which
[单选题]Alice 用 Bob 的密钥加密明文,将密文发送给 Bob。Bob 再用自己的私钥解密,恢复出明文。以下说法正确的是:
A.此密码体制为对称密码体制
B.此密码体制为私钥密码体制
C.此密码体制为单钥密码体制
D.此密码体制为公钥密码体制
[单选题]Alice 有一个消息 M 通过密钥 K2 生成一个密文 E(K2,M)然后用 K1 生成一个 MAC 为 C(K1,E(K2,M)),Alice 将密文和 MAC 发送给 Bob,Bob 用密钥 K1 和密文生成一个MAC 并和 Alice 的 MAC 比较,假如相同再用 K2 解密 Alice 发送的密文,这个过程可以提供什么安全服务?
A.仅提供数字签名
B.仅提供保密性
C.仅提供不可否认性
D.保密性和消息完整性
[简答题] He had to leave early yesterday.
[单选题]A police officer claimed he had attempted to _______ paying his fare.
A. avoid
B. reject
C. refuse
D. neglect
[简答题]What did they say they had done?
[简答题] I had lunch with a friend of mine.
[判断题]Yani had her personal shows in Washingtond.c.a at the age of 14.
A:T B:F
A.正确
B.错误
[简答题] He told me that he had bought a book.
[简答题] He said that he had left his umbrella in the library.
[简答题]When I arrived at the station, the train had already left.
[单选题]If the doctor had been available, the child_______
A. would not die
B. could not have died
C. might not die
D. should not have died
[单选题] The bell had_______ rung than the students quieted down.
A.when
B.hardly
C.no sooner
D.once
[判断题]氢的含量测定的重复性用符号Had表示。( )
A.正确
B.错误
