Electromagnetic shielding as a method of protecting data processing equipment from information leaks

Abstract

The paper substantiates and experimentally investigates the effectiveness of methods and innovative materials for shielding electromagnetic radiation and guaranteed neutralization of technical channels of information leakage. After all, protection from targeted interception of side electromagnetic radiation and interference and ensuring electromagnetic compatibility of technical means is a strategic necessity required by national and international standards. It is proven that data processing equipment is a source of side electromagnetic radiation and interference and creates critical channels for leakage of confidential information. A material for shielding electromagnetic radiation in a broadband frequency range has been developed. Nanocomposite material, developed on the basis of epoxy resin with finely dispersed iron oxides (Fe2O3 and Fe3O4). Tests were conducted at a frequency of 5 GHz (critical for wireless communication) in order to establish the dependence of the shielding and reflection coefficients on the size and concentration of the filler. It is proven that increasing the dispersion of the metal-containing filler (using particles of 50−100 nm) provides a higher overall shielding coefficient compared to larger particles (200−300 nm) at the same weight concentration, which indicates better dispersion and an increased area of ​​interaction with the electromagnetic field. A direct dependence of the overall shielding efficiency on increasing the filler concentration has been established, which confirms the effectiveness of the absorption and reflection mechanisms. With increasing concentration, the reflection coefficient increases, which indicates an effective improvement in the divergence of wave impedances at the interface. The effectiveness of the developed composite material has been proven, however, its widespread implementation is limited by design shortcomings (large thickness and fragility of the epoxy matrix) and the high cost of specialized production of nanoparticles.