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intrusion detection system (IDS)

Definitions:

  Software that automates the intrusion detection process.
Sources:
NIST SP 800-12 Rev. 1 under Intrusion Detection System (IDS) from NIST SP 800-94

  A security service that monitors and analyzes network or system events for the purpose of finding, and providing real-time or near real-time warning of, attempts to access system resources in an unauthorized manner.
Sources:
NIST SP 800-82r3 under intrusion detection system from RFC 4949 - adapted

  Software that looks for suspicious activity and alerts administrators.
Sources:
NISTIR 7711 under Intrusion Detection System