A methodology to rank importance of frequencies and channels in electromyography data with Decision Tree classifiers

Collection of recent arXiv submissions (April 20, 2026) covering sensing, communications, and inverse learning with several papers that raise potential security and privacy concerns. Notable items: (1) a RIS‑aided transmitter privacy framework that formalizes how a malicious sensor can estimate transmitter–sensor channels and proposes active/passive beamforming and transmit‑side artificial noise to degrade unauthorized channel estimation; (2) a dual‑function radar enabling ambient backscatter where a tag exploits radar reverberation as an ambient carrier—this architecture could enable covert/协