1.5 Technical Channels of Information Leakage
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(b) Pickup of informative signals in AES connecting lines and external conductors
caused by informative stray and/or parasitic electromagnetic radiation;
(c) Pickup of informative signals in IPE electrical circuits, caused by internal
capacitive and/or inductive couplings (“leakage” of informative signals in the
electrical feed circuit through IPE electric power supplies);
(d) Pickup of informative signals in IPE ground circuits, caused by informative IPE
SER, as well as by galvanic coupling of the logic ground and IPE units.
Various auxiliary equipment, their connecting lines, as well as power supply lines,
external conductors, and grounding circuits function as random antennas. When
connected to intelligence equipment, interception of directed informative signals is
possible (Fig. 1.16).
Random antennas can be focused and distributed.
A focused random antenna is a compact tool (for instance, telephone set, broadcasting loudspeaker, fire detector, etc.) connected to a line outside the controlled
area.
Distributed random antennas include random antennas with distributed parameters: cables, wires, metal pipes, and other conductive lines outside the controlled
Fig. 1.16 Interception of pickup of informative signals from utility lines using TIE SERP