先决条件 – 安全攻击的类型 |主动和被动攻击
主动攻击：
主动攻击是一种攻击类型，攻击者努力改变或修改消息的内容。主动攻击对完整性和可用性都是危险的。由于主动攻击系统总是被破坏并且系统资源可以被改变。最重要的是，在主动攻击中，受害者被告知攻击。
被动攻击：
被动攻击是攻击者观察消息内容或复制消息内容的攻击类型。被动攻击是保密的危险。由于被动攻击，对系统没有任何损害。最重要的是，在被动攻击中，受害者不会被告知攻击。
主动攻击和被动攻击的区别：
| S.NO | Active Attack | Passive Attack |
|---|---|---|
| 1. | In active attack, Modification in information take place. | While in passive attack, Modification in the information does not take place. |
| 2. | Active Attack is danger for Integrity as well as availability. | Passive Attack is danger for Confidentiality. |
| 3. | In active attack attention is on detection. | While in passive attack attention is on prevention. |
| 4. | Due to active attack system is always damaged. | While due to passive attack, there is no any harm to the system. |
| 5. | In active attack, Victim gets informed about the attack. | While in passive attack, Victim does not get informed about the attack. |
| 6. | In active attack, System resources can be changed. | While in passive attack, System resources are not change. |
| 7. | Active attack influence the services of the system. | While in passive attack, information and messages in the system or network are acquired. |
| 8. | In active attack, information collected through passive attacks are used during executing. | While passive attack are performed by collecting the information such as passwords, messages by itself. |
| 9. | Active attack is tough to restrict from entering systems or networks. | Passive Attack is easy to prohibited in comparison to active attack. |