信息系统面临多种类型的网络安全威胁。其中，信息泄露是指信息被泄露或透露给某个非授权的实体；（）是指数据被非授权地进行增删、修改或破坏而受到损失；（作答此空）是指对信息或其他资源的合法访问被无条件地阻止；（）是指通过对系统进行长期监听，利用统计分析方法对诸如通信频度、通信的信息流向、通信总量的变化等参数进行研究，从而发现有价值的信息和规律。
- A.拒绝服务
- B.陷阱门
- C.旁路控制
- D.业务欺骗
正确答案及解析
正确答案
解析
拒绝服务攻击由攻击者向服务器发送大量垃圾信息或干扰信息的方式，导致服务器无法向正常用户提供服务。陷阱门是编程人员在进行程序设计时建立的，在程序正常运行时，通过某些按键和参数可以绕过正常的安全检查和错误跟踪检查。旁路攻击会绕过对加密算法的繁琐分析，利用密码算法的硬件实现的运算中泄露的信息，如执行时间、功耗、电磁辐射等，结合统计理论快速的破解密码系统。欺诈者采用某种手段欺骗合法的用户或系统自愿地放弃敏感信息等
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