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1 Information Weapon: Concepts, Means, Methods …
Fig. 1.10 Classification of technical channels of information leakage
• Modulation of stray electromagnetic radiation of high-frequency IPE generators using the informative signal (at operating frequencies of high-frequency
generators);
• Modulation of IPE stray electromagnetic radiation using the informative signal
(for instance, radiation resulting from self-triggering of low-frequency amplifiers).
Stray electromagnetic radiation (SER) of IPE is unwanted radio-frequency
radiation resulting from non-linear processes in IPE units [24].
Stray electromagnetic radiation occurs in the following modes of information
processing by means of computer technology:
– Information display on the screen;
Keyboard data input;
Recording data on storage media;
Reading data from storage media;
Data transmission to communication channels;
Sending data to peripheral printing devices—printers, plotters; recording
scanned data on magnetic media, etc.
In each mode of computer equipment operation, SER has its own characteristic
features. SER frequencies may range from 10 kHz to 2 GHz.