LEO卫星网络中星间切换的安全机制研究

Research on security mechanism of inter-satellite handover in LEO satellite scenario

现有方法关于研究低轨卫星切换的场景主要是地面终端用户与卫星接入点直接通信,要求地面移动终端用户自身的天线必须达到极高的发射功率才能连接。另外,卫星需要处理每一个地面终端用户的切换消息将会承担较大的计算负担和带宽消耗。本文提出了一种适用于小功率移动终端在低轨卫星之间安全切换的方法。该方法基于身份密码体制进行协议设计,将网关作为代理完成卫星之间的可信关系传输,避免了卫星需要处理与整个移动终端用户可信关系的情况。理论分析表明,该方法能够减少星地之间的传输数据和通信次数,且卫星的计算量在地面移动终端用户数量增多的情况下仍然保持稳定的较小计算开销,能够满足安全切换的需求。

The existing methods about handover of low orbit satellite mostly under the scenario that the terrestrial mobile terminal users are directly connected with the satellite,which requires the antenna of the users fixed on the terrestrial mobile terminal must achieve extremely high emissive power ability to realize the connection. Moreover,the satellites need to bear the great calculation burden and bandwidth consumption when handling the handover messages with each ground mobile terminal users. This paper puts forward a method suitable for low power terrestrial mobile terminal safe handover between low orbit satellites. The method designs the protocol which is on the thesis of identity based cryptography,and makes the gateway work as the agent to complete a trusted relationship transfer between the satellites,avoiding the scenario that the satellite needs to handle the credible relationships with the whole mobile terminal users. Finally,theoretical analysis shows that this method can reduce the number of data transmission and communication between satellites and the ground,and the amount of computation of satellite still keeps a stable computation overhead under the increasing number of ground mobile terminals,and can meet the needs of secure handover.