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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.
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