| Summary: | 碩士 === 國立中正大學 === 資訊管理學系暨研究所 === 99 === Wireless sensor network (WSN) has gathered great importance in recent years, they can support large scale of domains such as military, environment, health… et al. Broadcast authentication is one of the most important service in WSN. Some asymmetric key based mechanisms for broadcast authentication have been proposed recently, such as TinyPK, BAS and HAS, but all of them cannot give a consideration to security, scalability, and efficiency at the same time. Therefore, we propose a novel broadcast authentication mechanism for WSN called GHAS which uses HAS and GPS. In our mechanism, each sensor node directly uses Bloom Filter to authenticate the nearby users, so the energy efficiency can be improved by eliminating the energy consumption. Furthermore, each sensor node uses HAS to authenticate the mobile users who are not nearby, so GHAS can also support a large enough number of mobile users.
In our simulations, we build many kinds of mobile users’ moving scenarios. The result shows that in most situations the energy consumption in GHAS is less than in HAS when the number of mobile users they support is the same. We also analysis the security strength in GHAS, the malicious node cannot fabricate the legal asymmetric key pairs in the limit time that WSN lives.
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