安全高效的空间信息网中群组密钥交换协议

为实现空间信息网中保密通信,提出一个适用于空间信息网的群组密钥交换协议。协议充分考虑了空间信息网中结点的通信特点,所有的卫星结点根据其所在的轨道划分为不同的簇。协议由簇内阶段、簇间阶段和密钥分发阶段组成,每个结点均生成密钥贡献值并汇总至地面中心结点,中心结点生成密钥并秘密发送给每个结点。证明了协议具有语义安全性,进行了通信复杂度分析并利用NS2软件进行了仿真验证。结果表明:相比其他协议,本文协议在空间信息网中应用时具有较高的通信效率。

Efficient secure group key exchange protocol in space information networks

A group key exchange protocol was proposed to implement secure communication in space information networks. In this protocol, all satellite nodes in a space information network were divided into different clusters according to the orbits they belonging. The protocol was composed of intra-cluster phase, inter-cluster phase and key distribution phase. Each node generates a key contribution value and sends it to the center node on the ground. On receiving all the contribution values, the center node generates a group key and distributes the key to all nodes in a secure manner. The semantic security of the proposed protocol was proved. Communication complex analysis and NS2 simulation software were employed to evaluate the proposed protocol. Results show that the proposed protocol achieves higher efficiency than other related protocols.