Intrusion Detection System
Intrusion Detection System (IDS) have become very popular in many years because the variation in intruder, we are living on the age of technology the researcher and security expert facing many challenges daily, so there is a need to create such a thing that can monitor the entire network.
In the field of information security intruder means a hacker or a cracker or simply a abnormal activities, if an attacker get access into the network than the attacker try to steal the sensitive information that can caused great harm to the company, means everything is data.
There are firewall to protect these attacker so why we need the new term that is IDS.
Limitation Of Firewall
Although firewalls are good to secure a computer network, but firewalls has some limitation, firewall is simply a wall between your computer network and the outside world(Internet). it allows some traffic to pass and block some traffic to being enter into the network it cannot make decision on the basis of the incoming packet. There are different ways to bypass and cheat the firewalls. It cannot help you when:
- Connections that circumvent it
- New threat
- A malicious program hide in the attachment of the e-mail
Overview Of Intrusion Detection System
An Intrusion Detection System monitors the network traffic and take decision about the incoming and outgoing packets, these decision based on some information that has collected by IDS via its sensors. In short An intrusion detection system (IDS) is used to monitor the entire network, it detects intruders; that is, unexpected, unwanted or unauthorized people or programs on network. IDS provides the following:
- OS (Operating system) audit
- Monitor and analyze network traffic and user/system activity
- Auditing system for vulnerabilities
Intrusion Detection System (IDS) has multiple sensors used to monitor unexpected and unwanted activities.
- A sensor monitor log files
- A sensor monitor TCP ingoing or outgoing connections
An Intrusion Detection System (IDS) can work manually but it is recommended and mostly IT administrator automate the IDS to ensure the security. we can categorize IDS into two main types:
- Network Intrusion Detection Systems (NIDS)
- Host Intrusion Detection Systems (HIDS)
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