1.5 Technical Channels of Information Leakage
51
Fig. 1.18 Interception of informative signals when connecting SERP intelligence quipment to CE
power and ground lines
The appearance of informative signals in the CE electrical feed circuit can be
both due to SER and the presence of internal parasitic capacitive and/or inductive
couplings of the CE power supply rectifier device.
Pickup of informative signals in CE grounding circuits may also be due to the
galvanic coupling of the logic ground and CE units.
If a transformer substation or a ground plate is located outside the controlled
area of the facility, directed informative signals may be intercepted following the
connection of the SER intelligence equipment to them (Fig. 1.18).
The structures of technical channels of information leakage resulting from pickup
of informative signals in the CE electrical power and ground lines are shown in
Figs. 1.19 and 1.20, respectively.
1.5.3 Artificial Technical Channels of Information Leakage
Along with the passive means of intercepting CE-processed information, discussed
above, active means are described in [1], in particular the “high-frequency irradiation” method (Figs. 1.21 and 1.22). CE is irradiated from outside the facility
controlled area by powerful high-frequency harmonic signal (for these purposes, a
high-frequency generator with a directional antenna characterized by a narrow radiation pattern is used). When an irradiating electromagnetic field interacts with the
51
Fig. 1.18 Interception of informative signals when connecting SERP intelligence quipment to CE
power and ground lines
The appearance of informative signals in the CE electrical feed circuit can be
both due to SER and the presence of internal parasitic capacitive and/or inductive
couplings of the CE power supply rectifier device.
Pickup of informative signals in CE grounding circuits may also be due to the
galvanic coupling of the logic ground and CE units.
If a transformer substation or a ground plate is located outside the controlled
area of the facility, directed informative signals may be intercepted following the
connection of the SER intelligence equipment to them (Fig. 1.18).
The structures of technical channels of information leakage resulting from pickup
of informative signals in the CE electrical power and ground lines are shown in
Figs. 1.19 and 1.20, respectively.
1.5.3 Artificial Technical Channels of Information Leakage
Along with the passive means of intercepting CE-processed information, discussed
above, active means are described in [1], in particular the “high-frequency irradiation” method (Figs. 1.21 and 1.22). CE is irradiated from outside the facility
controlled area by powerful high-frequency harmonic signal (for these purposes, a
high-frequency generator with a directional antenna characterized by a narrow radiation pattern is used). When an irradiating electromagnetic field interacts with the