VGA Shielding Efficiency Study

The article presents the technology of "soft TEMPEST." The architecture of the Video Graphics Matrix (VGA) interface is described in detail and the most common clock frequencies are determined depending on the screen resolution. The article discusses passive methods of protecting information from leakage due to TEMPEST: the main approaches and principles of equipment shielding are formulated. The physical basis of electromagnetic radiation shielding at various frequencies is presented. The paper analyzed modern design solutions for shielding the VGA interface to protect information from leakage after TEMPEST. During the study, the experiments were carried out using deployed antennas and a spectrum analyzer. The conclusions have been drawn and the assessment of the efficiency of various types of analog monitor interface shielding has been conducted.