| Summary: | 碩士 === 立德大學 === 數位應用研究所 === 98 === A Wireless Sensor Networks (WSN) can be applied to military reconnaissance, home nursing, and many other applications due to its easy deployment and low cost. A practical WSN is composed of a large amount of sensor nodes. Which can sense variations of current environment and exchange these information by broadcasting. However, since all sensor nodes broadcast messages through the open air, intruders can intercept the contents of communications by esaily eavesdropping. Besides, A WSN has its limitation on energy consumption. Therefore, how to construct a secure communication environment within minimum steps becomes an important task for WSNs.
This thesis proposes a group authenticated key exchange protocol for WSNs. In the proposed scheme, each sensor nodes can establish cluster keys in fixed rounds of communications. No matter how many sensor nodes exists in a WSN, the number of communication rounds are constant, thus decrease the energy consumption. Also, increase its flexibilities in application, the proposed scheme is still functional when base station is off-line. Furthermore, this thesis proposes protocols on dynamic insert, dynamic remove and cluster head replacement, when any sensor node join or leave the WSN, these two protocols can facilitate all legal sensor nodes and renew their keys simultaneously.
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