Wi-fi Signals Can Reveal Your Password

There are some things in science that you think are so unbelievable that they are just not possible. So, did you know that you can detect someone’s breathing and heart rate, even if you are in the next room? Well you can, as the breathing and skin movements affect the propagation of wi-fi signals, and the changes in the wi-fi signal can be detected for even the smallest of movements:

  • Vertical touch [Figure 1(c)]. This is where the same key is pressed continuously.


Like it or not, whenever you move around, you disturb the radio waves around you, and others can pick up that movement. So, perhaps you want to shield your PIN number entry in public places, not only for those spying with cameras, but from wifi spying.

Professor of Cryptography. Serial innovator. Believer in fairness, justice & freedom. EU Citizen. Auld Reekie native. Old World Breaker. New World Creator.

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