Lab Notes

One company is already selling paint that it claims will prevent Wi-Fi signals from permeating a wall, and now Intel has a somewhat more sophisticated method. Their technique (let's call it "Wi-Dar") involves uses the time it takes for a packet to travel to and from a mobile device and the wireless access point. The access point can then calculate its distance from the mobile device, and use that measurement to determine whether or not to grant access.

If the technique proves effective, you'll still need to provide encryption and some higher level form of user authentication as Intel's method proves only location, not identity. However, it's still an interesting new approach.