中文摘要：

空间网络中的节点如卫星节点、临近空间节点等都将在空中长期存在，而节点私钥若长期不进行更新则会增加其被攻破的危险，为了保证节点私钥的安全，需对节点私钥进行定期更新。采用分层分组式的组密钥管理模式，利用基于身份的公钥加密机制，提出了对空间网络中临近空间节点、私钥生成中心主密钥分量、卫星节点和地面节点的私钥更新机制，该方案能够适应空间网络的层次化架构，满足其对强扩展性、高可靠性等的要求。

英文摘要：

In this paper, we proposed an identity-based hierarchy group key management scheme （ ID-HGKM） for the entire space network,using the hierarchical-grouped group key management scheme.In ad-dition to a common group key generation,distribution and update,we also considered the part of the private key update.Using the identity-based key encryption mechanism which is proposed by Boneh and Franklin, we proposed the private key update mechanism for space network.The program can adapt to the hierarchical structure of the space network and meet the requirements of its strong scalability and high reliability.