| Summary: | 碩士 === 國立中興大學 === 資訊科學與工程學系所 === 97 === In wireless sensor network, key encryption technology is a basic technique for protecting the secrecy of transmitted data among sensor nodes. However, sensor node is congenitally limited by its insufficient resource of hardware such as memory size and battery duration. Therefore, current key management schemes are not all appropriate for wireless sensor networks. In this thesis, we propose a new method which uses dynamic key management schemes for heterogeneous wireless sensor networks (HSNs).
In the proposed scheme, a hash function is loaded into base station, cluster heads, and sensor nodes. Cluster heads and sensor nodes then generate their own key-chain that provides forward authentication in case of key change for security reason. Pair-wise keys are established between cluster heads and sensor nodes to ensure transmission secrecy.
The proposed scheme can reduce the number of keys needed in sensor nodes and cluster heads. It is also robust to the following attacks: guessing attacks, replay attacks, falsification attacks, man-in-the-middle attacks, and node captured attacks.
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