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What is an intrusion detection system ? What are the difficulties in anomaly detection ?

An Intrusion Detection System (IDS) is like a digital security guard for computer networks. Its job is to monitor and analyze the activities happening on a network or a computer system to identify any unusual or suspicious behavior that could indicate a potential security threat.

Normal Behavior vs. Anomalies:

  • Normal Behavior: Think of normal behavior as the usual patterns of activity on a computer network. It’s like the routine actions and interactions that happen regularly.
  • Anomalies: Anomalies are deviations from this normal behavior. They’re like unexpected or unusual activities that might signal a security problem.

Difficulty in Anomaly Detection:

  • Diverse Activities: Networks have a wide range of activities happening all the time, and it can be challenging to distinguish between regular and suspicious actions.
  • Changing Patterns: Normal behavior can change over time, making it tricky to define a fixed set of rules for what is considered normal.
  • False Positives: Anomaly detection systems may sometimes mistakenly flag normal behavior as suspicious, leading to false alarms.
  • Adaptation by Intruders: Smart attackers can adapt and change their tactics to avoid detection, making it difficult for the IDS to keep up.

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