Ids
- 2. What is IDS An intrusion detection system (IDS) is a device or software application that monitors network and/or system activities for malicious activities or policy violations and produces reports to a Management Station. Intrusion prevention is the process of performing intrusion detection and attempting to stop detected possible incidents. Intrusion detection and prevention systems (IDPS) are primarily focused on identifying possible incidents, logging information about them, attempting to stop them, and reporting them to security administrators.
- 3. What is IDS In addition, organizations use IDPSs for other purposes, such as identifying problems with security policies, documenting existing threats, and deterring individuals from violating security policies. IDPSs have become a necessary addition to the security infrastructure of nearly every organization. IDPSs typically record information related to observed events, notify security administrators of important observed events, and produce reports.
- 4. What is IDS Many IDPSs can also respond to a detected threat by attempting to prevent it from succeeding. They use several response techniques, which involve the IDPS stopping the attack itself, changing the security environment (e.g., reconfiguring a firewall), or changing the attack’s content.
- 5. IDS Terminology Alert/Alarm: A signal suggesting that a system has been or is being attacked. True Positive: A legitimate attack which triggers an IDS to produce an alarm. False Positive: An event signaling an IDS to produce an alarm when no attack has taken place.
- 6. IDS Terminology False Negative: A failure of an IDS to detect an actual attack. True Negative: When no attack has taken place and no alarm is raised. Noise: Data or interference that can trigger a false positive. Site policy: Guidelines within an organization that control the rules and configurations of an IDS.
- 7. IDS Terminology Site policy awareness: The ability an IDS has to dynamically change its rules and configurations in response to changing environmental activity. Confidence value: A value an organization places on an IDS based on past performance and analysis to help determine its ability to effectively identify an attack.
- 8. IDS Terminology Masquerader: A user who does not have the authority to a system, but tries to access the information as an authorized user. They are generally outside users. Misfeasor: They are commonly internal users and can be of two types: An authorized user with limited permissions. A user with full permissions and who misuses their powers. Clandestine user: A user who acts as a supervisor and tries to use his privileges so as to avoid being captured.
- 9. Types of intrusion detection systems-NIDS It is an independent platform that identifies intrusions by examining network traffic and monitors multiple hosts. Network intrusion detection systems gain access to network traffic by connecting to a network hub, network switch configured for port mirroring. In a NIDS, sensors are located at choke points in the network to be monitored, often in or at network borders. Sensors captures all network traffic and analyzes the content of individual packets for malicious traffic. An example of a NIDS is Snort.
- 10. Types of intrusion detection systems-HIDS It consists of an agent on a host that identifies intrusions by analyzing system calls, application logs, file-system modifications (binaries, password files, capability databases, Access control lists, etc.) In a HIDS, sensors usually consist of a software agent. An example of a HIDS is OSSEC. Intrusion detection systems can also be system- specific using custom tools and honeypots.
- 11. Types of intrusion detection systems-PIDS Detects and pinpoints the location of intrusion attempts on perimeter fences of critical infrastructures. Using either electronics or more advanced fibre optic cable technology fitted to the perimeter fence, the PIDS detects disturbances on the fence, and this signal is monitored and if an intrusion is detected and deemed by the system as an intrusion attempt, an alarm is triggered.
- 12. Types of intrusion detection systems-VMIDS It detects the intrusion using virtual machine monitoring. By using this we can deploy the Intrusion Detection System with Virtual Machine Monitoring. It is the most recent one its still under progressing. No need of separate intrusion detection system by using this we can monitor the overall activities.
- 13. Passive and/or reactive systems In a passive system, the intrusion detection system (IDS) sensor detects a potential security breach, logs the information and signals an alert on the console and or owner. In a reactive system, also known as an intrusion prevention system (IPS), the IPS auto-responds to the suspicious activity by resetting the connection or by reprogramming the firewall to block network traffic from the suspected malicious source.
- 14. Comparison with firewalls A firewall in that a firewall looks outwardly for intrusions in order to stop them from happening. Firewalls limit access between networks to prevent intrusion and do not signal an attack from inside the network. An IDS evaluates a suspected intrusion once it has taken place and signals an alarm. An IDS also watches for attacks that originate from within a system.
- 15. Comparison with firewalls This is traditionally achieved by examining network communications, identifying heuristics and patterns (often known as signatures) of common computer attacks, and taking action to alert operators.
- 16. Anomaly-based intrusion detection system A system for detecting computer intrusions and misuse by monitoring system activity and classifying it as either normal or anomalous. The classification is based on rules, rather than patterns or signatures, and will detect any type of misuse that falls out of normal system operation. This is as opposed to signature based systems which can only detect attacks for which a signature has previously been created.
- 17. Protocol-based intrusion detection system Typically installed on a web server, and is used in the monitoring and analysis of the protocol in use by the computing system. A PIDS will monitor the dynamic behavior and state of the protocol and will typically consist of a system or agent that would typically sit at the front end of a server, monitoring and analyzing the communication between a connected device and the system it is protecting.
- 18. Protocol-based intrusion detection system Typically installed on a web server, and is used in the monitoring and analysis of the protocol in use by the computing system. A PIDS will monitor the dynamic behavior and state of the protocol and will typically consist of a system or agent that would typically sit at the front end of a server, monitoring and analyzing the communication between a connected device and the system it is protecting.