一种面向低轨卫星网络的高效无证书身份认证方案

Efficient certificateless authentication scheme for LEO satellite networks

针对现有低轨卫星网络认证方案采用集中认证方式存在认证时延大和采用复杂的双线性映射存在计算开销大的问题,引入无证书认证模型,在Gayathri方案的基础上;设计了一种高效无证书认证方案。该方案将用户的公钥和真实身份统一起来,使得认证过程中不需要第三方参与,降低了认证时延;通过椭圆曲线上少量点乘和点加运算构建认证消息,避免使用双线性映射,降低了计算开销;并在随机预言模型下,基于椭圆曲线离散数学对问题假设,对其安全性进行了证明。最后,通过实验仿真,与现有低轨卫星身份认证方案相比,所提方案的认证时延、计算开销和通信开销较低。

Aiming at the problems of long time delay and high computation cost of using complex bilinear mapping in the current LEO satellite network authentication scheme,this paper proposed an efficient certificateless authentication scheme based on the Gayathri’s certificateless authentication scheme.This scheme unified the user’s public key and real identity,so that needn’t the third party to participate in the authentication process and reduced the authentication delay.It used a small number of point multiplication and point addition operations on the elliptic curve to construct the authentication message,which didn’t involve the bilinear mapping and reduced the computation cost.Then this paper proved the authentication scheme’s security based on the assumption of elliptic curve discrete mathematics under the random oracle model.Finally,through experimental simulation,comparing with the existing LEO satellite identity authentication schemes,the proposed scheme has lower authentication delay,computational overhead and communication overhead.