Unusual use of Wi-Fi found: identification of a person who is behind a wall

University of California engineersdeveloped a technology for identifying a person who is behind a wall (or any other similar obstacle) using a conventional video camera (or rather a person’s video) and signals emitted by ... Wi-Fi transmitters. Of course, it’s not worth worrying about the fact that your neighbors will suddenly begin to follow you using a router. But the technology looks very, very curious.

Wi-Fi is not only capable of distributing Internet

How to identify a person using Wi-Fi

The new technique allows you to determine whetherthe person behind the obstacle is the same person who is on the video. Moreover, the video does not have to be fresh. Thus, it is too early to start afraid of Wi-Fi networks. But if technology suddenly appears that poses a threat to the safety of personal data, you will be the first to know about it. Provided, of course, that you will be subscribed to our news channel in Telegram.

See also: How Wi-Fi Works

This new identity system has receivedthe name XModal-ID, where the first letter is not a letter at all, but the symbol of the “cross”, in English cross. Thus the name is pronounced as Cross-Modal-ID. And it can have many uses. Which ones? Well, for example, let's look at a scenario in which law enforcement agencies have a robbery video recording. They suspect that the robber is hiding inside the house, but there is no evidence of this. In addition, there may be hostages at home, but it is impossible to “peer” inside with the help of cameras. Here XModal-ID will come to the rescue.

Our approach allows us to determine whetherthe person behind the wall is the same as in the available video materials. At the same time, you only need a pair of WiFi transmitters, ”says one of the authors of the development, Professor Yasamin Mostofi. No preliminary data on Wi-Fi connection speed is needed for this. You don’t even need to know where exactly the subject is located. Only a video of this person is needed.

How it works? In essence, the principle of operation is very, very simple. One Wi-Fi signal transmitter and one Wi-Fi receiver are nearby. Behind the obstacle is a man. The transmitter sends a wireless signal, the received power of which is measured by the receiver. The waves of the wireless connection are reflected from the person behind the obstacle. Then, taking into account the available video recording of a person’s gait and movements, the measurements obtained make it possible to compose a three-dimensional model of a person. It is used to compare behaviors with those that were recorded by the camera.

Identification of a person “through obstacles” -quite promising technology. Each of us moves unique. And to use gait or other features of movement is almost the same as using biometric data.

This equipment is enough to identify a person

In order not to be unfounded, scientists testedits development on a group of volunteers. Of course, the sample was small - only 8 people. However, this amount was enough to prove the efficiency of the technology and correctly recognize people in 84% of cases. You can familiarize yourself with the course of the experiment in more detail on the video available below.

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