按照行为方式，可以将针对操作系统的安全威胁划分为：切断、截取、篡改、伪造四种。其中 （ ） 是对信息完整性的威胁。
- A.切断
- B.截取
- C.篡改
- D.伪造
正确答案及解析
正确答案
解析
（1）切断，是对可用性的威胁。系统的资源被破坏或变得不可用或不能用，如破坏硬盘、切断通信线路或使文件管理失效。（2）截取，是对机密性的威胁。未经授权的用户、程序或计算机系统获得了对某资源的访问，如在网络中窃取数据及非法拷贝文件和程序。（3）篡改，是对完整性的攻击。未经授权的用户不仅获得了对某资源的访问，而进行篡改，如修改数据文件中的值，修改网络中正在传送的消息内容。（4）伪造，是对合法性的威胁。未经授权的用户将伪造的对象插入到系统中，如非法用户把伪造的信息加到网络中或向当前文件加入记录。
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