| 摘要: |
| 物理层密钥生成技术使得节点能够利用无线信道的物理特性直接生成共享密钥，从而保证无线通信过程的安全性。针对当前物理层密钥生成方案普遍存在实际场景下密钥生成率低的问题，提出了一个基于Savitzky-olay滤波的物理层密钥生成机制优化方案。该方案中，合法通信节点首先探测信道并通过Savitzky-olay滤波消除部分由信道干扰造成的信道状态差异，然后，利用多级量化以及格雷码将信道状态转为比特序列，最终通过Cascade交互式信息协调协议以及基于2阶全域哈希函数的保密增强生成合法节点之间的共享密钥。实验结果表明，基于Savitzky-olay滤波的优化方案能够有效提高物理层密钥生成过程的效率，提高了此类安全机制的实际可用性。 |
| 关键词: 物理层密钥生成 Savitzky-olay滤波 全域哈希函数 |
| DOI：10.20079/j.issn.1001-893x.221218001 |
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| 基金项目:国家自然科学基金资助项目（61802042） |
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| A Physical Layer Key Generation Method Based on Savitzky-olay Filter |
| HAN Zhifang,ZHAN Furui |
| (1.School of General Education,Dalian Neusoft University of Information,Dalian 116023，China;2.Information Science and Technology College,Dalian Maritime University,Dalian 116026,China) |
| Abstract: |
| Physical layer key generation technology ensures that wireless nodes can directly generate shared secret keys from wireless channels,and thus guaranteeing the security of wireless communications.For the problem that the efficiencies of existing physical layer key generation schemes are inefficient in real environments,an optimization method based on Savitzky-olay filter is proposed to improve key generation process.In the proposed physical layer key generation scheme,legitimate transceivers first collect channel states and apply Savitzky-olay filter to eliminate discrepancies caused by channel interference.Then,multi-evel quantization and Gray code are used to convert channel states into bit sequences.Finally,information reconciliation based on the Cascade protocol and privacy amplification based on 2-niversal Hash functions are used to generate the shared keys.Experimental results show that the optimization method based on Savitzky-olay filter can effectively enhance the efficiency of physical layer key generation process and improve the availability of such mechanisms. |
| Key words: physical layer key generation Savitzky-olay filter universal Hash function |
