Date Added: Nov 2009
Key management is an important service for providing secure communications when the network size is large or the topology is undergoing frequent changes. In most existing key management schemes, a centralized key certification authority is used; however, it is not suitable for wireless environments due to the networks' scalability and the insufficient computation ability of mobile nodes. In this paper, a novel key management scheme is presented that emphasizes the secure and efficient key updates by using a frequency-based approach. Furthermore, the authors' scheme makes use of a combination of both symmetric and asymmetric key algorithms to protect other aspects of key management, such as data confidentiality, key distribution, etc.