Abstract
The methods of high-frequency “imposition” are effective methods of intercepting confidential information on objects of information activity. The publication examines the processes of forming technical channels for the leakage of speech information by methods of high-frequency “imposition”, a new method of technical protection of information from interception by these methods, the essence of which is the application of combined active interference that changes the properties of the probing signal. The purpose of the work is to consider the methodological aspects of determining the parameters of protective effects on the sounding signal to ensure reliable blocking of the information leakage channel. Obtaining such experimental data will allow for the practical construction of the proposed systems. The main tasks of experimental research are to ensure the maximum degree of efficiency of the proposed method of technical protection, to determine the maximum level of this efficiency and to determine the optimal parameters of protective signals. The main parameters of the protection system to be determined as a result of the experiment: determination of the frequency band of maximum effective influence for each type of modulation used in the interception of information, and determination of signal levels of maximum effective influence for each type of modulation. It is considered appropriate to build an experiment on sinusoidal signals of the audio frequency range, and as a criterion for evaluating the effectiveness of the level of protection provided by the system, use the ratio of power spectra of the dangerous signal measured in the receiver before and after the impact of the proposed interference. Since the tasks must be solved for all types of modulation that occur during high-frequency “imposition”, it is proposed to apply the superposition method for each of them, which will ensure the unambiguous interpretation of the obtained results and the completeness of research sufficient for further design. The results of simulation studies, which were carried out to find the parameters of protective signals capable of ensuring the maximum possible destruction of the informative parameters of a dangerous signal, and, as a result, creating countermeasures against the interception of confidential information by interested parties, are presented.
Published Version
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