RU2803538C1 - Method for localizing technical channels of information leakage created by radio traffic devices - Google Patents

Abstract

FIELD: information protection.

SUBSTANCE: protecting information from leakage through technical channels. When probing the environment of the possible placement of technical channels with a spatially localized ultra-wideband pulse signal, the oscillatory circuits that are part of the radio traffic devices are pre-excited by probing the surfaces of the protected room with a package of pulse signals with high-frequency filling, while the lower and upper frequencies of the high-frequency filling pulse signals are set equal to the lower and upper frequency of the operating range of the radio traffic devices, in addition, the frequencies of the high-frequency filling of each pulse are spaced relative to each other by the width of the signal spectrum of the traffic device.

EFFECT: ensuring the localization of technical channels of information leakage created by radio traffic devices.

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Description

The invention relates to the field of radio engineering and electronics, in particular to methods for protecting information from leakage through technical channels, and can be used to identify technical information leakage channels in a protected area created by radio embedded devices for unauthorized access to speech or visual information.

There is a known method for identifying technical channels of information leakage, based on localization in space (location determination) of embedded devices using means using the principles of electromagnetic induction, detection of a nonlinear effect, detection of a response to a probing signal. The disadvantage of this known method is that these actions are difficult to implement, require large financial and labor costs, and in addition they are characterized by low efficiency in identifying technical channels of information leakage [1].

There are known methods based on localizing technical channels of information leakage using nonlinear locators, taking into account possible a priori characteristics. Devices that implement these methods are built on the principle of a narrow-band device that operates to receive the second and (or) third harmonics corresponding to a single probing frequency. The methods have the following disadvantages: the limited ability to confidently localize the locations of embedded devices due to the analysis of a small number of parameters, the inability to select the necessary frequency components of the probing signal spectrum and filters in the receiving path of the device for their registration [2].

There is a known method based on the localization of technical channels of information leakage using a nonlinear locator, which consists in increasing the information content of received signals due to spectral analysis of the 2nd and 3rd harmonic signals re-emitted by nonlinear devices, implemented directly in the nonlinear locator. Along with the disadvantages already mentioned above, the device that implements it has a fairly high cost and requires the involvement of highly qualified specialists [3].

There is a known method for localizing technical channels of information leakage, which involves probing the environment of possible placement of technical channels of information leakage with a spatially localized ultra-wideband pulse signal during sequential discrete step scanning [4].

The method has a significant drawback due to the fact that, according to the authors, the characteristics of the received signals and their changes are compared with possible changes in images and possible images of the characteristics of technical information leakage channels, i.e. in the absence of a corresponding image, a technical channel whose characteristics are unknown will not be detected.

The objective of the invention is to simplify the process of localizing technical information leakage channels created by radio embedded devices for unauthorized access to speech or visual information, as well as to expand the functionality of devices used to implement this process.

This technical result is achieved by the fact that in order to implement a method for localizing technical channels of information leakage created by radio embedded devices for unauthorized access to speech or visual information, the environment of the possible placement of technical channels of information leakage of channels is probed with a spatially localized ultra-wideband pulse signal, additionally in the protected room preliminarily excite the oscillatory circuits that are part of the radio-embedded devices, for which the surface is probed with a package of pulse signals with high-frequency filling, while the lower and upper frequencies of the high-frequency filling of the pulses of the package are set equal to the lower and upper frequencies of the range in which the radio-embedded devices can operate, in addition to the frequency The high-frequency content of each pulse is spaced relative to each other by the width of the signal spectrum of the radio embedded device.

Due to the fact that in the protected room a preliminary probing of the environment for the possible placement of technical information leakage channels is carried out with a package of pulse signals with high-frequency filling, the lower and upper frequencies of which are set equal to the lower and upper frequencies of the range in which radio embedded devices can operate, the oscillatory circuits will be excited , included in radio embedded devices. As a result, excited by a probing pulse with a high-frequency filling frequency corresponding to the resonant frequency of the circuit itself, the circuits re-emit a probing signal at a resonant frequency, which is received and the fact of its reception is regarded as the presence of unauthorized access to speech or visual information in the protected room.

To ensure the reception of a damped oscillation created by irradiating the medium with a probing signal, it is advisable to select a duty cycle value of the pulses in the packet equal to 50%, at which, at the moment of pauses between pulses, the receiving device will record damped oscillations of the circuit of the radio embedded device.

To implement the method, both omnidirectional and narrowly directional antennas can be used or their joint use. The use of omnidirectional antennas is possible at the beginning of the search, to determine the presence of an oscillatory circuit in the protected room, and the use of a narrowly directional antenna will allow localizing the location of the radio embedded device.

The method proposed in the invention can be implemented both as part of, for example, a nonlinear locator, and as an independent device, while the visualization tool can be - in the case of a nonlinear locator, a separate LED of the corresponding color, the glow of which will characterize the presence of oscillatory circuits in protected room, and in the case of a separate device - a PC monitor displaying on it the spectrum of received signals.

The method proposed in the invention will eliminate false positives of nonlinear locators in the case of masking radio embedded devices in places where metal objects are placed that contain a metal-oxide-metal structure, which is characterized by the presence of a stable p-n junction. In this case, the implementation of the proposed method will make it possible to identify the embedded device by exciting its oscillatory circuits and recording the resulting oscillations at resonant frequencies.

A comparative analysis of the essential features of the prototype and the proposed invention shows that the claimed invention, in which the environment of possible placement of technical information leakage channels is probed with a spatially localized ultra-wideband pulse signal, while additionally in the protected room the oscillatory circuits included in the radio embedded devices are pre-excited, probing the surface of the protected premises with a package of pulse signals with high-frequency filling, while the lower and upper frequencies of the high-frequency filling pulse signals are set equal to the lower and upper frequencies of the operating range of the radio-embedded devices, in addition, the frequencies of the high-frequency filling of each pulse are spaced relative to each other by the width of the signal spectrum of the radio-embedded device, which makes it possible to simplify the process of localizing technical channels of information leakage created by radio-embedded devices for unauthorized access to speech or visual information, as well as expand the functionality of devices used to localize technical channels of information leakage, which was impossible in the prototype.

The formation of a packet of pulses of the probing signal takes into account the knowledge of the lower and upper frequencies of the range in which radio embedded devices can operate, while the first pulse in the packet has a high-frequency content equal to the lower frequency of the range, and the last pulse in the packet has a high-frequency content equal to the upper frequency of the range respectively. At the same time, taking into account the fact that the quality factor of the oscillatory circuits of modern radio embedded devices is quite high, the high-frequency filling frequencies of each pulse are spaced relative to each other by the width of the spectrum of the radio embedded device signal, the value of which, for example, can be 100 - 200 kHz. Based on the nominal frequencies of the range in which radio embedded devices can operate, the upper value of which can reach 300 MHz, the duration of each pulse is selected from the conditions for the formation of a damped oscillation and can range from 4 to 35 μs.

The result of the implementation of this technical solution may be a simplification of the process of localizing technical channels of information leakage created by radio embedded devices for unauthorized access to speech or visual information, as well as expanding the functionality of devices used to implement this process.

INFORMATION SOURCES

1. Spy stuff / Ed. S.A. Zolotoreva. - St. Petersburg: Lan, 1996, p. 134-135.

2. Khorev A.A. Methods and means of protecting information. - M.: RF Ministry of Defense, 1998, p. 198-210.

3. RF patent No. 2571532.

4. RF Patent No. 2219669 - prototype.

Claims (1)

A method for localizing technical channels of information leakage created by radio-embedded devices, including probing the environment for the possible placement of technical channels of information leakage with a spatially localized ultra-wideband pulse signal, characterized in that the oscillatory circuits included in the radio-embedded devices are preliminarily excited, probing the surfaces of the protected premises with a package of pulse signals with high-frequency filling, while the lower and upper frequencies of the high-frequency filling pulse signals are set equal to the lower and upper frequencies of the operating range of the radio-embedded devices; in addition, the frequencies of the high-frequency filling of each pulse are spaced relative to each other by the width of the signal spectrum of the radio-embedded device.