Definitions[edit | edit source]

Intrusion detection is

the process of monitoring events occurring in a computer system or network and analyzing them for signs of intrusion.[1]
[t]he process of identifying that an intrusion has been attempted, is occurring, or has occurred.[2]

Overview[edit | edit source]

There are two different approaches to analyzing events to detect attacks: signature-based detection and anomaly detection.

  • Signature-Based Detection. This approach identifies events or sets of events that match with a predefined pattern of events that describe a known attack. These patterns are called signatures. Signatures may include system states, or accessing system areas that have been explicitly identified as “off-limits.”
  • Anomaly Detection. Anomaly detection assumes that all intrusive activities deviate from the norm. These tools typically establish a normal activity profile and then maintain a current activity profile of a system. When the two profiles vary by statistically significant amounts, an intrusion attempt is assumed.

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