Another Layer of Technical Debt in Your Living Room
I’ve spent the last decade watching the tech industry try to solve problems that don’t exist by creating problems that shouldn’t. The latest trend hitting the 802.11 standard—specifically the upcoming 802.11bf amendment—is ‘WiFi Sensing.’ To the marketing department, it’s a ‘revolutionary way to detect movement and health metrics without cameras.’ To anyone who has ever had to debug a wireless mesh network at 2 AM, it’s a privacy-shredding nightmare built on top of already fragile infrastructure.
CSI: Not the TV Show, the Privacy Leak
For the uninitiated, this isn’t science fiction. It leverages Channel State Information (CSI). WiFi signals don’t just travel in a straight line; they bounce off walls, furniture, and your increasingly anxious body. By analyzing how these subcarriers are distorted (amplitude and phase shifts), an algorithm can determine if you’re sitting, standing, or—if the ML model is expensive enough—how fast you’re breathing.
We used to call this ‘interference.’ Now, we’re calling it a ‘feature.’
The ROI of Constant Monitoring
The pitch is always the same: ‘It can detect if an elderly person falls!’ Sure. It can also detect exactly how many people are in a room, their gait, and their daily routines. And let’s be honest about the ROI here. We are adding massive computational overhead to consumer-grade routers—devices notorious for having the security posture of a wet paper bag—just so we can avoid buying a $20 motion sensor?
From an engineering perspective, the complexity-to-utility ratio is absurd. You’re taking a protocol designed for data throughput and forcing it to act as a low-resolution RADAR. The result? More firmware bloat, more CVEs, and a signal environment that is constantly ‘pinging’ your biology to see if you’re still there.
The ‘Opt-Out’ Illusion
On the recent Hacker News threads, the optimists are arguing that we can just ‘encrypt the CSI data.’ Good luck with that. If the hardware is capturing the physical perturbations of the environment, the data exists at the physical layer. Once that data is hooked into the ‘cloud-managed’ ecosystem of modern ISPs, you’ve lost control.
We’re building a world where the very medium we use to check our email is also the medium used to map our homes in 3D. It’s a passive surveillance system that requires zero ‘buy-in’ from the user. You don’t have to carry a phone or stand in front of a camera. You just have to exist within the 2.4GHz/5GHz/6GHz spectrum.
My Recommendation?
Expect the ‘Smart Home’ enthusiasts to swallow this whole because they love the idea of lights turning on when they walk into a room. Meanwhile, the rest of us will be looking for routers that don’t come pre-packaged with a digital Peeping Tom.
If you think the ‘Internet of Things’ was a security disaster, wait until the ‘Internet of Sensing’ turns every wall in your house into a witness. Personally, I’m looking into Faraday cages for the bedroom. It’s the only way to get some actual ‘offline’ time in a world that refuses to stop measuring us.