下列攻击行为中属于被动攻击的是（）
- A.假冒
- B.伪造
- C.DoS
- D.监听
正确答案及解析
正确答案
解析
主动攻击(active attack)可能改变信息或危害系统。威胁信息完整性和有效性的攻击就是主动攻击。主动攻击包括：拒绝服务攻击DoS、信息篡改、资源使用、欺骗、入侵攻击、口令攻击、等攻击方法。
被动攻击主要是收集信息而不是进行访问，数据的合法用户对这种活动一点也不会觉察到。被动攻击包括：监听、信息收集等攻击方法。
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