In this paper, we propose a subnetwork key management strategy in which the heterogeneous security requirements of a wireless sensor network are considered to provide differing levels of security with minimum communication overhead. Additionally, it allows the dynamic creation of high security subnetworks within the wireless sensor network and provides subnetworks with a mechanism for dynamically creating a secure key using a novel and dynamic group key management protocol. The proposed energy-efficient protocol utilizes a combination of pre-deployed group keys and initial trustworthiness of nodes to create a level of trust between neighbors in the network. This trust is later used to allow secure communication between neighbors when creating a dynamic, high security subnetwork within the sensor network. Results of simulations of the protocol in Ns2 are presented and the complexity of the protocol is analyzed. The proposed protocol reduces delay by 50% and energy consumption by 70% over the existing dynamic group key management (DGKM) scheme.

Meeting Name

32nd IEEE Conference on Local Computer Networks, 2007


Electrical and Computer Engineering

Second Department

Computer Science

Keywords and Phrases

Energy Efficiency; Key Management; Network Security; Wireless Sensor Network

Document Type

Article - Conference proceedings

Document Version

Final Version

File Type





© 2007 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.