计算机科学 ›› 2022, Vol. 49 ›› Issue (6): 356-362.doi: 10.11896/jsjkx.210400097
• 信息安全 • 上一篇
梁珍珍1, 徐明1,2
LIANG Zhen-zhen1, XU Ming1,2
摘要： 针对海洋环境不确定性导致水声信道容易受到各种威胁和攻击的问题,提出了一种基于海洋水声信道的密钥协商方案。该方案首先对海洋环境的不确定性进行建模,构造计算噪声、多径、多普勒参数表达式,提出了基于Rényi熵的水声信道干扰因子概念;其次,基于Twisted Edwards椭圆曲线构造Hash函数,进行身份的认证与初始密钥的提取;然后,使用分段初始密钥的典型序列作为初始化种子,生成分段Toeplitz矩阵,并对Toeplitz矩阵与初始密钥的矩阵乘法采用分块运算生成标签,进行初始密钥的安全传输;最后,初始密钥经再次Hash,实现了保密增强并生成了最终的安全密钥。通过信息理论证明了所提方案的正确性、健壮性和保密性,并得出了敌手主动攻击成功概率的上界。仿真结果表明,当初始信息量为50 000 bit时,敌手主动攻击成功率的上界为4.3×10－23,密钥生成率为631 bit/s。与现有方案相比,所提方案在密钥生成率和误比特率方面具有明显的优势。
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