未分类题

根据下面的文字资料回答 59～63 题A向B发送消息P，并使用公钥体制进行数字签名。设E表示公钥，D表示私钥，则B要保留的证据是（ 1 ）。基于数论原理的RSA算法的安全性建立在（ 2 ）一的基础上。
Kerberos是MIT为校园网设计的身份认证系统，该系统利用智能卡产生（ 3 ）密钥，可以防止窃听者捕获认证信息。为了防止会话劫持，Kerberos提供了（ 4 ）机制，另外报文中还加入了（ 5 ），用于防止重发攻击(Replay Attack)。
第59题：文中（ 1 ）处正确的答案是（ ）。

A.EA(P)
B．EB(P)
C．DA(P)
D．DB(P)

【参考答案】

C
RSA(Rivest-Shamir-Adleman)算法是一种基于大数不可能质因数分解假设的公匙体......

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单项选择题
听力原文： Some parts of the earth are more likely to have quakes than others. This is usually true of mountain areas, because there the thickness of rocks, which make up the earth's crust, is not even. But quakes may often be felt in level regions, too, because the waves, which come from the center of a quake, run often for thousands of miles. It is easy to understand why man is so frightened by an earthquake. People used to think that when there was an earthquake, the ground opened, swallowed great numbers of people, then closed, and those who were killed disappeared forever. We know now this does not happen. What we need to fear are the after-effects of a serious earthquake: fires, floods, and landslides. Since the Yellowstone earthquake some people have said that they would never go to that area for fear of being caught in a landslide occurring after the earthquake. This is, actually a foolish idea. Such a fear would keep us away from mountains the rest of our lives. Even though earthquakes happen every day something like the Madison River landslide does not happen very often. We can realize gratefully that few of us will suffer because of such a disaster. At the same time we can understand the need of being ready to help those who do suffer such trouble.(33)A．Because the waves coming from the center of a quake can spread to these places.B．Because there are the thickness of rocks making up the earth's crust.C．Because some parts of the earth are more likely to have quakes than others.D．Because mountainous areas are easy to have earthquakes.
A.
B.
C.
(33)
A．Because
D.
B．Because
E.
C．Because
F.
D．Because
G.
单项选择题
文中（ 1 ）处正确的答案是（）。

A．两次握手机制
B．三次握手机制
C．滑动窗口机制
D．Windows窗口机制
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