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中文摘要：
由于Ad hoc网络拓扑结构的动态性、无线传输媒体的开放性等特点，使得网络容易受到各种安全威胁。提出一种新的密钥协商算法MGDH，并且结合MGDH提出一种可扩展的基于地理区域的组密钥管理方案（RGKM）。方案中无须可信赖的第三方，从而解决了单点失效问题，通过引入反向路由的思想，在保证安全性的同时减少了网络的通信量，有效实现了网络的能量平衡。
英文摘要：
Ad hoe network has the characteristics of dynamic topology and openning of wireless transmission media, the network is vulnerable to security threats. This paper proposed an algorithm named MGDH for key agreement. Furthermore, put forward a scalable group key management scheme （RGKM） based on geographical region. The single point failure problem was solved due to independence of the trusted third party. By introducing the idea of reverse routing,decreased the traffic without security reduced, which was helpful to the realization of energy balance.
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