How can intrusion detection tools prevent unauthorized access to an information system?

2 Network-based intrusion detection

Network-based intrusion detection (NID) is the type of intrusion detection that focuses on the network layer of an information system. NID monitors the network traffic and packets that flow between different nodes, such as routers, switches, servers, or clients. NID can detect any anomalies or patterns that indicate an attack, such as port scanning, denial of service, or spoofing. NID can be deployed at various points of the network, such as the perimeter, the core, or the segments, depending on the scope and level of protection required.

3 Host-based intrusion detection

Host-based intrusion detection (HID) is the type of intrusion detection that focuses on the host layer of an information system. HID monitors the activity and events that occur on a specific host, such as a server, a workstation, or a mobile device. HID can detect any changes or modifications that affect the host's configuration, files, processes, or registry. HID can also monitor the user's actions and behavior, such as login attempts, keystrokes, or commands. HID can be installed on each host or centrally managed by a server.

4 How can intrusion detection prevent unauthorized access?

Intrusion detection can prevent unauthorized access to an information system by providing several benefits, such as detection, deterrence, prevention, and analysis. Detection allows system administrators or security personnel to identify the source, nature, and extent of the attack. Deterrence discourages potential attackers from targeting the information system. Prevention blocks or filters network traffic or host activity that matches certain rules or signatures of known attacks. Analysis provides valuable information and evidence for the analysis and investigation of the attack, helping to understand the attacker's motives, methods, and objectives. Ultimately, intrusion detection can reduce the risk and frequency of attacks while improving the security measures and policies of the information system.

6 What are the best practices for intrusion detection?

To maximize the benefits of intrusion detection and overcome its challenges, organizations should follow best practices such as selection, integration, update, and review. Selection involves choosing the right type, location, and configuration of the intrusion detection system based on the size, structure, and function of the information system. Integration connects and coordinates the intrusion detection system with other security tools and components to enhance security posture and performance. Update keeps the intrusion detection system up to date with the latest data, rules, and signatures of attacks for improved accuracy and reliability. Finally, review monitors and evaluates the activity and performance of the intrusion detection system to identify any issues or anomalies.

7 Here’s what else to consider

This is a space to share examples, stories, or insights that don’t fit into any of the previous sections. What else would you like to add?