When electric device works, electromagnetic emission can result in information leakage. In this paper, the recognition method of EM leakage of information caused by video signal EM emission arising from computer is presented and the recovered word image from EM leakage is given based on actual system. For convenient to get the intact usefulness information of video signal, the pattern recognition method based on artificial neural network is proposed. At last, the primary word image recovered from EM leakage is recognized and reconstructed. The result shows that EM leakage should be much concerned in information secure field.
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