Zhang Jiemin and Zhang Zidong
Bit Hamming Distance, electromagnetic information leakage, Soft-Tempest, information security, intelligent equipment
Due to unavoidable phenomena of electromagnetic radiation in running digital intelligent equipments, electromagnetic information leakage would be caused, thus threatening information security. Regarding the problem and drawback of signal-processing-based Soft-Tempest methods, this paper proposed a method to prevent eletromagnetic information leakage based on Hamming distance and a new concept “Bit Hamming Distance . The new method tries to solve the problem on processed data. Computing Hamming distance and “Bit Hamming Distance to make the values as small as possible, the radiation intensity could be reduced further. Keeping Hamming distance and “Bit Hamming Distance constant can increase the difficulty of interception to the utmost extent. By adjusting pro- cessed binary bit, not only eletromagnetic radiation can be reduced, but also anti-interception and anti- reconstruction can be achieved. The new method has the advanges of shorter computation time, less memory requirement and better prevention result. This method is also predictable and measurable. As theoretical computation partly displaced experiment process, the cost of method study is reduced.
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