報告題目：From Quantization to Matching: Secret key Generation over Wireless Channel with COTS Devices
報告形式：騰訊會議 ID：682 983 709
Securing wireless communication remains challenging in dynamic mobiles 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 scenarioses.
劉鴻博，電子科技大學計算機科學與工程學院（網絡空間安全學院）教授，博士生導師，入選國家級人才計劃。2013年於美國史蒂文斯理工學院獲得電子工程博士學位，之後加入印第安納大學普渡大學印第安納波利斯分校曆任助理教授（2013年8月-2019年7月）和副教授（2019年8月-2019年12月），2020年加入電子科技大學計算機科學與工程學院（網絡空間安全學院）任教至今。劉鴻博教授長期從事無線物理層安全和無線感知與移動計算領域的基礎和應用研究並取得了一係列原創性成果，為相關領域研究的推廣與應用提供了技術支撐，共發表相關領域高水平學術論文70餘篇，曾獲ACM MobiCom 2011和IEEECNS2018的最佳論文獎，部分研究成果已應用於智慧城市、智能家居和公共場所安防等領域。