Inferring passwords typed on phones based on how hands block WiFi signals: https://fermatslibrary.com/s/when-csi-meets-public-wifi-inferring-your-mobile-phone-password-via-wifi-signals (incredible!)
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An actively exploited security issue in keyfobs that work by proximity: malicious users can replay signals from the house to the car! https://geekologie.com/2019/08/gone-in-thirty-seconds-doorbell-cam-foot.php
Newer cars use rolling keycodes so you can't replay the same code after locking, but this seems harder to defend against.
Applying machine learning to paywalls, only opening content if your signals suggest the user might subscribe!
"In world championship [chess] matches, [...] players were ensconced behind polarized glass walls to prevent anyone in the audience from passing computer advice through signals."
AI and human chess today:
