This document summarizes a research paper that proposes a secure approach for intruder detection using backtracking. The approach detects intruders by analyzing network traffic and matching it to known attack patterns. If an abnormal behavior or attack is identified, an alert is sent to the administrator. When messages are sent between nodes, the receiver uses backtracking to check the transaction history and identify any differences in node keys that could indicate an intruder. This helps track down the intruder by analyzing previous transactions in the network.