• What is Intrusion Detection System (IDS)?

    Intrusion Detection System (IDS)


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    Intrusion Detection System

    An intrusion Detection System (IDS) is a device or software application that monitors a Network or detecting vulnerability exploits against a target computer. It also automatically monitors the Internet to search for any of the latest threats which could result in a future attack.

    Although intrusion detection systems monitor networks for potentially malicious activity.

    How Does IDS Techniques Work?


    Signature-Based Detection -    

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    Signature Based IDS Detection

    Compares signatures against observed events to identify possible incidents. In case of any matching, an alert is issued. An advantage of this system is it has more accuracy and standard alarms understood by the user. These alerts can discover issues such as known malware, network scanning activity, and attacks against servers.


    If You Read About IPS? Click On Link and Read Out.

    Anomaly-Based Detection - 

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    Anomaly-based IDS Detection

    Compares definitions of what is considered normal activity with observed events to identify significant deviations. It regularly monitors the networktraffic and compares it with the statistical model. In case of any anomaly or discrepancy, the administrator is alerted.

    For example, if a user always logs into the network from California and accesses engineering files, if the same user logs in from Beijing and looks at HR files this is a red flag.


    Passive Intrusion Detection System: -  It simply detects the kind of malware operation and issues an alert to the system or network administrator.

    Different types of intrusion detection systems

    •  Network Intrusion Detection System (NIDS)
    • Host Intrusion Detection System (HIDS)

    Network Intrusion Detection System (NIDS)

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    Network Intrusion Detection System 

    • This system monitors the traffic on individual networks or subnets by continuously analyzing the traffic and comparing it. A network-based system, or NIDS, the individual packets flowing through a network are analyzed. 
    • The IDS is placed along with the network boundary or between the network and the server.
    If You Read About OSI Model? Click On Link and Read Out.

    Host Intrusion Detection System (HIDS)

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    Host Intrusion Detection System

    • This system monitors the operating system of the computer. The IDS is installed on the computer. In a host-based system, the IDS examines at the activity on each individual computer or host. 
    • The advantage of this system is it can accurately monitor the whole system and does not require the installation of any other hardware.

    List of Open Source IDS Tools:-
    • Snort
    • Suricata
    • Bro (Zeek)
    • OSSEC
    • Samhain Labs
    • OpenDLP

    Features of IDS:-
    • It monitors and analysis the user and system activities.
    • Generating an alarm and notifying that security Admin.
    • It detectserrors in system configuration.
    • Reporting when the IDS detects that data files have been altered.
    • It assesses the integrity of the system and data files.





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