面向卫星网络断续连通场景的接入和切换认证机制

Access and Handover Authentication in Intermittent Connection Scenario of Satellite Network

针对低轨卫星网络链路断续连通的问题提出一种接入认证、通信恢复和卫星切换方案。该方案基于对称密码体制设计,采用单向散列算法、异或操作和时间戳保护机制,在实现安全接入认证的前提下,降低信令开销、带宽开销和计算开销。针对链路中断情况,该方案基于卫星网络和用户的当前会话密钥,快速安全地恢复通信,保障服务质量。通过轨道预测技术,根据当前会话密钥和随机数实现卫星接入点间安全切换,减少卫星切换过程中的通信成本。该方案还可实现用户身份匿名性,成功认证后刷新临时身份用于下一次认证。

This article disclosed an authentication method for access and handover in a low-orbit satellite network intermittent connection scenario.The scheme was based on a symmetrical cryptographic system.Based on hash function,XOR operation and timestamp,the safe access of the terminal to the satellite network was ensured.It reduced signaling overhead, bandwidth overhead, and computing overhead as well.In view of the link interruption,the solution was based on the current session key between the user and satellites to quckly and safely resume communication to ensured the quality of service.Through the orbit prediction technology,according to the current session key between the user and satellites and random number,the safe switching between satellites was realized, and the communication cost during the satellite switching process was reduced.The scheme realized the anonymity of user identity,and refreshed the temporary identity for the next authentication after successful authentication.