从信源向信宿流动过程中，信息被插入一些欺骗性的消息，这种攻击_爱下问搜题

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问题单项选择题

从信源向信宿流动过程中，信息被插入一些欺骗性的消息，这种攻击属于______。

A．中断攻击
B．截取攻击
C．重放攻击
D．修改攻击

答案

参考答案：D

解析：典型的安全攻击包括以下4种。
· 中断：指系统资源遭到破坏或变得不能使用，这是对可用性的攻击；
· 截取：指未授权的实体得到了资源的访问权，这是对保密性的攻击；
· 修改：指未授权的实体不仅得到访问权，而且还篡改资源，这是对完整性的攻击；
· 捏造：是指未授权的实体向系统中插入伪造的对象，这是对真实性的攻击。
· 从信源向信宿流动过程中，信息被插入一些欺骗性的消息，这种攻击属于修改攻击。

完形填空

The boss of an Australian restaurant is tired of the waste left by customers. He has required them to eat      on their plates or they’ll be fined and won’t be allowed to       next time.
Chef Yukako Ichikawa has introduced a 30 percent discount for customers who eat all the food they have ordered at Wafu, her      restaurant which is not far from Sydney.
"To contribute to      a future which can continue to develop, we require a little       of our guests than most other restaurants," she says and she has put up a list of her rules on the door to the restaurant .
This list includes finishing all dishes ordered which are free of milk, sugar and eggs and the cook and all her workers tell people who don't      their plates to choose       restaurant next time.
"      your meal means that everything is eaten       lemon slices, ginger(生姜) and wasabi," says the menu.
"Please also pay attention to that vegetables and salad on the      are not decorations（装饰品）; they are       of the meal too."
Wafu's strict rules have been      by some but against by some reviewers. Ichikawa insists on it.
"Wafu is not just a restaurant; it is also the      of Yukako's personal qualities ," says a statement on the restaurant's website.
“We not only serve meals and respect the body       prevent waste. We have       to protect the environment and keep the healthy development of our earth.”

B．some things

D．discovering

问答题简答题

简述司马相如对汉赋的贡献。