Today, hacking and computer system attacks are common making the importance of intrusion detection and active protection all the more relevant. Intrusion detection systems (IDSes), intrusion prevention systems (IPSes), firewalls, and honeypots are the security mechanisms implemented to secure networks or systems. But attackers are able to manage even these security mechanisms and trying to break into the legitimate system or network with the help of various evasion techniques.
An intrusion detection system is used to monitor and protect networks or systems for malicious activities. To alert security personnel about intrusions, intrusion detection systems are highly useful. IDSes are used to monitor network traffic. An IDS checks for suspicious activities. It notifies the administrator about intrusions immediately.
The main purposes of IDSes are that they not only prevent intrusions but also alert the administrator immediately when the attack is still going on. The administrator could identify methods and techniques being used by the intruder and also the source of attack.
An IDS works in the following way:
* IDSes have sensors to detect signatures and some advanced IDSes have behavioral activity detection to determine malicious behavior. Even if signatures don't match this activity detection system can alert administrators about possible attacks.
* If the signature matches, then it moves to the next step or the connections are cut down from that IP source, the packet is dropped, and the alarm notifies the admin and the packet can be dropped.
* Once the signature is matched, then sensors pass on anomaly detection, whether the received packet or request matches or not.
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