• ISSN 0258-2724
  • CN 51-1277/U
  • EI Compendex
  • Scopus
  • Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
  • Chinese S&T Journal Citation Reports
  • Chinese Science Citation Database
ZHANG Hongxin, LÜ, Yinghua, HE Pengfei, WANG Haixia. Text Recovery from EM Leakage of Computers[J]. Journal of Southwest Jiaotong University, 2007, 20(6): 653-658.
Citation: ZHANG Hongxin, LÜ, Yinghua, HE Pengfei, WANG Haixia. Text Recovery from EM Leakage of Computers[J]. Journal of Southwest Jiaotong University, 2007, 20(6): 653-658.

Text Recovery from EM Leakage of Computers

  • Received Date: 01 Nov 2005
  • Publish Date: 25 Dec 2007
  • A text receiving and recovery system was designed for EM information leakage from computers.After EM leakage is intercepted by a broad band antenna,band-pass filtered and amplified,the vertical and horizontal synchronization signals are captured by a phase locked loop circuit.The synchronization signals are sampled and processed by an analog-digital converter to get digital video signals.Then,the noises of video signals are filtered using an average filter.At last,the text in the digital video is recovered using a matched filter.An experimental result shows that text can be recovered from EM leakage 12 m away for a Pentium 486 computer with a CRT display,and the signal to noise ratios of the vertical and horizontal synchronization signals are increased by 18.7 dB with the average filter.

     

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