Experimental substantiation of the possibility of using the elastic and air-permeable electromagnetic shields based on foiled materials for protecting voice information from leakage
The paper presents the results of a study of the influence of elastic and air-permeable electromagnetic shields based on foiled materials on the levels of electromagnetic radiation in the frequency range of 0.4...2.5 GHz, generated by simulators of simulators of devices for unauthorized retrieval of information due to an exposure to these simulators by short radio pulses. This study has been carried out with the aim of experimentally substantiation the possibility of these shields use to protect speech information from leakage via the direct acoustic and parametric channels. In the course of the study, the method based on the use of the hardware and software complex “Locator for the detection of LV-2R devices”, designed to identify transceiver devices for unauthorized retrieval of information based on the resonance phenomena in their antenna systems and in associated filter elements and including an autonomous a generating and receiving unit, the broadband antenna, the personal computer on which special software for detailed information processing is installed, the set of connecting cables and the set of simulators of devices for unauthorized retrieval of information, has been applied. It has been found that elastic and air-permeable electromagnetic shields based on foiled materials reduce the level of electromagnetic radiation generated by simulators of devices for unauthorized retrieval of information due to exposure to them by short radio pulses, to those values at which this radiation can not be recorded by receiving antennas. As a result, it has been concluded that the investigated electromagnetic shields are the promising solution for ensuring the information protection from leakage via the direct acoustic and parametric channels. Such shields are recommended for use as cladding modules for rooms designed for speech information of limited distribution and where devices used for its unauthorized retrieval could be installed or located. Keywords: parametric channel of speech information leakage, foiled material, electromagnetic shield.