| 摘要: |
| 利用信道状态信息(Channel state information,CSI)的密钥生成技术已经发展多年,常见的方法是利用CSI中全部子载波的信息作为一次密钥的数据源,在此类方法中,虽然合法通信双方所获CSI信息具有高度的相似性,但密钥生成速率相对较低;或者信道变化对所有子载波产生相似的影响,整体趋势不变,使得不同轮次生成的密钥重复率过高,密钥更新率较低。为此,本文首次提出了基于双载波商模型的密钥生成方法,充分利用多载波的信息,在保障合法通信双方数据互易性的基础上,使得密钥生成速率明显提升;针对序号邻近的子载波间存在相关性导致密钥重复段过多的问题,提出了一种集合划分方法以及提取集合内具有代表性序列,从而消除密钥重复段。最后,搭建实验系统证明:双载波商模型可以有效提升密钥生成速率;基于集合划分的子载波相关性消除方法可以消除大量重复段,提高密钥更新率;基于双载波商模型和子载波相关性消除的密钥生成方法可以在保证双方不一致率小于给定阈值的情况下,使得生成的密钥具有更良好的性能和安全性。实验结果表明,本文提出的双载波商模型在静态及动态场景通信双方视距1.5m情况下,将密钥生成速率提升3～9倍,针对消除密钥重复段的子载波集合划分方法将密钥更新速率提升2～3倍,由于子载波数只有52,可以忽略带来的额外计算开销。 |
| 关键词: 物理层安全 密钥分配 信道状态信息 双载波商模型 密钥生成速率 |
| DOI：10.19363/J.cnki.cn10-1380/tn.2025.07.01 |
| 投稿时间：2023-09-04修订日期：2023-12-13 |
| 基金项目:本课题得到国家重点研发计划项目(No. 2022YFB2902202)以及国家自然科学基金项目(No. 62171121和 No. U22A2001)资助。 |
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| Research on High-Speed Generation Method of Physical Layer Key Based on Dual Carrier |
| JIANG Yu,WANG Yuchun,HU Aiqun |
| School of Cyberspace Security, Southeast University, Nanjing 211189, China;Purple Mountain Laboratories, Nanjing 211189, China;Key Laboratory of Computer Network Technology of Jiangsu Province, Nanjing 211189, China;School of Cyberspace Security, Southeast University, Nanjing 211189, China;Purple Mountain Laboratories, Nanjing 211189, China;State Key Laboratory of Mobile Communication, Southeast University, Nanjing 210096, China |
| Abstract: |
| The key generation technology using channel state information (CSI) has been developed for many years, and the common method is to use all the subcarrier information in CSI as the data source of the primary key, in such methods, although the CSI information obtained by the legal communication parties has a high degree of similarity, but the key generation rate is relatively low. Or the channel change has a similar effect on all subcarriers, and the overall trend remains unchanged, making the key repetition rate generated in different rounds too high and the key update rate low. Therefore, this paper proposes a key generation method based on the dual-carrier quotient model for the first time, which makes full use of multi-carrier information and significantly improves the key generation rate on the basis of ensuring the data reciprocity of both parties to the legal communication. Aiming at the problem of excessive key duplication caused by the correlation between subcarriers adjacent to the serial number, a set division method and extracting representative sequences in the set are proposed to eliminate the key repeat segments. Finally, an experimental system is built to prove that the dual-carrier quotient model can effectively improve the key generation rate. The subcarrier correlation elimination method based on ensemble division can eliminate a large number of duplicate segments and improve the key update rate. The key generation method based on the dual-carrier quotient model and subcarrier correlation elimination can make the generated key have better performance and security under the condition that the inconsistency rate between the two parties is less than the legal threshold. The experimental results show that the dual-carrier quotient model proposed in this paper increases the key generation rate by 3～9 times under the condition of 1.5m between the communication parties in static and dynamic scenes, and increases the key update rate by 2～3 times for the subcarrier ensemble division method that eliminates the key repeat segment, because the number of subcarriers is only 52, which can ignore the additional computational overhead. |
| Key words: physical layer security key distribution channel status information dual carrier quotient model key generation rate |
