Exploring the Implications of New Body-Scanning Wi-Fi Technology

Researchers at La Sapienza University of Rome have developed a new body-scanning system called “Who-Fi” that uses Wi-Fi signals to identify individuals — with impressive accuracy. By analysing how human bodies interact with these signals, the system can recognise people through walls, in low light, and without the need for cameras.

How It Works

“Who-Fi” relies on a combination of Channel State Information (CSI) and a Deep Neural Network (DNN) with a Transformer-based encoder. CSI captures how Wi-Fi signals are disrupted by a person’s body, and the AI model learns to associate those patterns with specific individuals.

What’s striking is the simplicity of the setup. The researchers used just two off-the-shelf TP-Link N750 routers to collect the data. No specialised hardware, no invasive cameras — just Wi-Fi.

Accuracy and Limitations

In controlled tests, the system was able to identify individuals with up to 95.5% accuracy. It even managed to distinguish people despite changes in clothing, like wearing a coat or carrying a backpack.

However, the study was limited in scope. Only 14 people were involved, and each was tracked during brief walks in a test area. So while the early results are impressive, the technology hasn’t yet been tested in more complex, real-world environments.

Privacy Concerns

The potential for privacy issues is significant. Unlike camera surveillance, which is easy to spot and can be limited by lighting or obstructions, Wi-Fi-based tracking could operate invisibly in the background.

This raises serious questions:

• Could someone be tracked without their knowledge in public or private spaces?
• What happens if this technology is commercialised or misused?
• How do we regulate something that uses everyday household tech?

While Wi-Fi sensing has been used for helpful applications — like monitoring breathing in healthcare or adjusting smart home devices — “Who-Fi” stretches the boundaries of what’s possible, and what’s acceptable.

The Bigger Picture

As with many emerging technologies, there’s a balance to strike between innovation and ethics. Body-scanning via Wi-Fi could lead to breakthroughs in security, accessibility, and medical monitoring. But without clear privacy safeguards, it also opens the door to silent, pervasive surveillance.

The conversation around this tech is just beginning, but it’s one worth having — before it becomes part of our everyday lives.

You can read the full article on PC Gamer here.