In information security, intruder detection is the art of detecting intruders behind attacks as unique persons. This technique tries to identify the person behind an attack by analyzing their computational behaviour. This concept is sometimes confused with Intrusion Detection (also known as IDS) techniques which are the art of detecting intruder actions.
Read more about Intruder Detection: Theory, Some of The Parameters Used To Identify A Person, Keystroke Dynamics, History, Translation Confusion