报告题目：From Quantization to Matching: Secret key Generation over Wireless Channel with COTS Devices
报告人：刘鸿博 电子科技大学
报告时间：2022年8月15日20:00-21：00
报告形式：腾讯会议 ID：682 983 709
报告摘要：
Securing wireless communication remains challenging in dynamic mobile environments due to the shared nature of wireless medium and lacking fixed key management infrastructures. Generating secret keys using physical layer information thus has drawn much attention to complement traditional cryptographic-based methods, and on-going research have demonstrated its viability in various radio frequency (RF) systems. Most of existing work rely on quantization technique to convert channel measurements into digital binaries that are suitable for secret key generation. However, non-simultaneous packet exchanges in time division duplex systems and noise effects in practice usually create random channel measurements between two users, leading to inconsistent quantization results and mismatched secret bits. While significant efforts were spent in recent research to mitigate such non-reciprocity, no efficient method has been found yet. Unlike existing quantization-based approaches, we take a different viewpoint from previous quantization-based approaches to match the randomly manipulated (i.e., permuted or edited) channel measurements between a pair of users by minimizing their discrepancy holistically. Specifically, two novel secret key generation algorithms based on bipartite graph matching (BM-SKG) and edited sequence alignment (SA-SKG) are developed. BM-SKG allows two users to generate the same secret key based on the permutation order of channel measurements, while SA-SKG aims to align the edited channel measurements between a pair of users for secret key agreement. Extensive experimental results show that both BM-SKG and SA-SKG algorithms could achieve error-free key agreement on channel measurements with a low cost under various scenarios.
报告人简介：
刘鸿博，电子科技大学计算机科学与工程学院（网络空间安全学院）教授，博士生导师，入选国家级人才计划。2013年于美国史蒂文斯理工学院获得电子工程博士学位，之后加入印第安纳大学普渡大学印第安纳波利斯分校历任助理教授（2013年8月-2019年7月）和副教授（2019年8月-2019年12月），2020年加入电子科技大学计算机科学与工程学院（网络空间安全学院）任教至今。刘鸿博教授长期从事无线物理层安全和无线感知与移动计算领域的基础和应用研究并取得了一系列原创性成果，为相关领域研究的推广与应用提供了技术支撑，共发表相关领域高水平学术论文70余篇，曾获ACM MobiCom 2011和IEEECNS2018的最佳论文奖，部分研究成果已应用于智慧城市、智能家居和公共场所安防等领域。
