Problem statement Novel security methods and models are needed for hwsns to function in the presence of an attack. Heterogeneity provides hierarchy that leverages resource efficient security tasks This dissertation research focuses on developing a robust networking architecture and secure communication scheme with an efficient key management system and secure routing protocolProblem Statement Novel security methods and models are needed for HWSNs to function in the presence of an attack. Heterogeneity provides hierarchy that leverages resource efficient security tasks. This dissertation research focuses on developing a robust networking architecture and secure communication scheme with an efficient key management system and secure routing protocol. 8