空间网络中密钥协商协议的设计与分析

The Design and Analysis of Key Agreement Protocol in Space Information Network

摘要: 针对空间信息网络中节点间安全高效通信需求，本文利用组合公钥思想设计了一个节点间密钥协商协议。地面控制中心首先完成基于身份的组合密钥的生成，并通过安全通道分发至各空间节点。当各空间节点间需要通信时，在进行双向身份认证后，利用本身的三个秘密值与对方节点的可信公钥信息计算得出两方节点的会话密钥。文章详细分析了协议自身的安全特性，并将协议和现有的相关协议在安全和性能两个方面进行比较。比较结果表明，本文设计的协议不仅在安全性方面有所提升，且具有更髙的计算效率。

Abstract: In order to meet the security and efficient communication requirements of nodes in space information network, a scheme of key agreement between nodes based on combined public key is proposed. The ground control center first completes the generation of the combination key based on identity and distributes it to the space nodes through a secure channel. When communication between different nodes is needed, after the two-way authentication is carried out, the two party nodes' session key is calculated by using their three secret values and the trusted public key information of the other nodes. The security properties of the protocol are analyzed, and compare the protocol and related protocols existing in the two aspects of security and performance. The comparison results show that this protocol not only has improved in terms of safety, and has higher computational efficiency.