在网络安全中，截取是指未授权的实体得到了资源的访问权。这是对
A．可用性的攻击
B．完整性的攻击
C．机密性的攻击
D．合法性的攻击
参考答案：C
解析： 安全攻击的类型主要有4种：中断、截取、修改和捏造。
1)中断是指系统资源遭到破坏和变得不能使用，这是对可用性的攻击。
2)截取是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，未授权实体可以是一个人、一个程序和一台计算机。
3)修改是指未授权的实体不仅得到了访问权，而且还篡改了资源；这是对完整性的攻击。
4)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。
The requirements for high school graduation have just changed in my community.As a result，all students must ____sixty hours of service learning，____ they will not receive a degree.Service learning is a kind of learning that helps the community.__ __ of service learning include cleaning up a polluted river，working in a soup kitchen，or instructing a student.__ __ a service experience，students must keep a journal(日志) every day and then write a ____ about what they have learned. Supporters claim that there are many ____ of service learning. Perhaps most importantly，students are forced to think ____ their own interests and become ____ of the needs of others.Students are also able to learn real－life skills that ____ responsibility，problem－solving，and working as part of a team.____，students can explore possible careers ____ service learning.For example，if a student wonders what teaching is like，he or she can choose to work in a school classroom a few afternoons each month. ____ there are many benefits，opponents(反对者)____ problems. First，they ____ that the main reason students go to school is to learn core subjects and skills.Because service learning is time－consuming，students spend ___ time studying the core subjects.Second，they believe that forcing students to work without ____ goes against the law.By requiring service，the school takes away a student's freedom to choose. In my view，service learning is a great way to ____ to the community，learn new skills，and explore different careers.____，I don't believe you should force people to help others—the ____ to help must come from the heart.I think the best ____ is one that gives students choices： a student should be able to choose sixty hours of independent study or sixty hours of service.Choice encourages both freedom and responsibility，and as young adults，we must learn to handle both wisely.
|