A new method to recognize computer through electromagnetic radiation based on spectral centroid

The electromagnetic waves emitted from devices can be a source of information leakage and can cause electromagnetic compatibility (EMC) problems. Electromagnetic radiation signal from computer display can be seen as a computer security risk if the radiation signal is intercepted and reconstructed. In addition to the image information displayed by the computer, electromagnetic radiation leaks the hardware information of the computer itself which is more important for some attackers, protectors and security inspection workers. In this paper, we model the electromagnetic radiate video signal and theoretically prove that variation trend of spectrum harmonics of electromagnetic radiate video signal vary between different computers. Based on the model we propose spectral centroid based algorithm (SP algorithm) to identify computers. By using the algorithm, we can automatically and accurately identify computers through electromagnetic radiation.