WiFi CSI: Your Router Can See You Move — Privacy Implications of Channel State Information

By Ken Imoto — 8-year Software Engineer at Propel-Lab, Author of "Practical Claude Code" on Kindle What if I told you your home WiFi router could be acting as a surveillance camera right now? In 2022, Carnegie Mellon University published "DensePose from WiFi," a paper demonstrating that WiFi signals alone can reconstruct 24-point human body poses through walls in real-time — with near-camera-level accuracy in controlled conditions. In February 2026, the implementation repository wifi-densepose hit GitHub Trending #1, reigniting attention around this technology. No cameras. No microphones. If you're within WiFi range, your body position can be seen through walls. And this attack can be executed with an ESP32-S3 (~$30 USD) . I have personal experience with this technology. Back in 2022, I read the original paper and spent weeks trying to build human presence detection using consumer WiFi hardware. I consulted with a reinforcement learning researcher and iterated on implementations, but u