Abstract: Research problems are to enhance an Intrusion Detection System (IDS) of a clustered HWSN to prolong its lifetime operation in the presence of unreliable and malicious nodes. Also, to address the energy consumption and QoS gain in reliability, delay and security with the goal to maximize the lifetime of a clustered HWSN while satisfying application QoS requirements in the context of multipath routing. The proposed research is a highly scalable cluster-based hierarchical trust management protocol for wireless sensor networks (WSNs) to effectively deal with selfish or malicious nodes.