Adversarial CSI Obfuscation Against Device-Free Activity Recognition in RIS-Assisted Systems
Reconfigurable Intelligent Surfaces (RISs) extend 5G New Radio (NR) coverage by redirecting signals toward Non-Line-of-Sight regions, but the same reflected footprint exposes Channel State Information (CSI) to passive eavesdroppers, who can train a Machine Learning classifier on it and perform unauthorized device-free...