The method of protection technical means of information processing from information leakage through side channels of electromagnetic radiation and interference
The invention relates to communication technology and can be used to protect information processed by technical means from leaking through the side channels of electromagnetic radiation and interference. The technical result achieved by the proposed method is to convert the electromagnetic field surrounding the technical means of information exchange (Tsai), randomly without adding in this energy field additional masking signal, which improves the electromagnetic and environmental situation in the area Tsoi. The invention consists in that Tsoi placed near the antennas in the Fresnel zone, and converting the electromagnetic field randomly carried out by changing the resistance of the controlled loading of the antenna synchronously with the noise signal when you connect the noise generator to the input of the controlled loading of the antenna. 1 Il.
The invention relates to communication technology and can be used to protect information processed by technical means from leaking through the side channels of electromagnetic radiation and interference (pre).
Analysis of the spectrum of electromagnetic radiation technical means of the t range spurious electromagnetic radiation, by receiving and analyzing which you can get information circulating in Tsoi. The restriction of information in Tsoi prevents its unauthorized person with access to basic (wire or radio) communication channel. However, using a special radio receivers can distinguish information from stray electromagnetic radiation Tsoi, and the induced high-frequency methods of imposing radiation. Therefore, to protect confidential information from unauthorized removal use technical means and methods of protection, preventing the release of information leakage channels.
One of such remedies is a protective shielding Tsoi or premises where they are located , .
The disadvantage of this method of screening is the presence of local violations of electrokinetically screen locations lids, hatches, doors, connectors, tools, display, input and output cables and communications. In these places electromagnetic waves beyond the screen and can be intercepted by radio intelligence.
There is a method of protection from surveillance , in which the walls of the screening chamber is performed in a sandwich mstie local violations of electrokinetically screen protection surveillance is provided by the efficiency of this screen. In case of local disturbances electrokinetically screen in these areas occurs radiation interference which masks concealed radiation.
The disadvantage of this method consists, first, in its complexity, which limits the scope of mostly stationary objects, and secondly, is insufficient masking of signals induced on the circuit outside of the screen.
Known methods of active resistance radio razvedka, which generate noise electromagnetic waves and direct them towards the likely location of the signal monitoring means .
For example, in the method for protecting data in a local communication system  beyond the perimeter of the radio system up and during the whole time of operation of the system is continuously radiated noise signals in the entire frequency band used in the communication system. The power of these signals is selected more than the power that the worker signals may have on the perimeter of the system.
The known method has the following disadvantages.
Protection information from leaking via the pre at frequencies different from the frequencies used for radio communication.
Continuous radiation at p is agnaou the situation in the dislocation of the system and creates obstacles for the normal operation of radio-electronic means, not part of the local system.
Noise electromagnetic radiation worsen the ecological situation not only for the perimeter of the dislocation system, but within it due to the presence of masking emitters of electromagnetic fields to the rear and side lobe.
Noise electromagnetic radiation inevitably affect the quality of communication in the local system. Receivers radio stations local system must have a special channel to highlight masking noise and device for compensation of the receiver output. This fact significantly increases the complexity of the system.
From some of these shortcomings can be eliminated by using secret information for each subscriber that will allow to refuse masking radiation around the perimeter of the system. However, in this case, you may have a leak of information from TSO through the pre, and therefore will need additional noise generators to mask spurious emissions and signals of high-frequency forcing (crosstalk).
The closest in technical essence to the proposed technical solution and selected as a consequence, as the prototype is way maskirovka the boron characters not relevant to the information symbols to be processed in digital equipment, randomly choose them, modulate their high-frequency signal generator and an antenna to radiate the modulated signal, thereby forming an electromagnetic field which overlaps on field created by stray electromagnetic radiation digital equipment, masks last.
The disadvantage of this method is that the energy of the spurious electromagnetic radiation adds energy masking signal that creates a hostile electromagnetic and environmental conditions. The situation is compounded by the fact that the level of the masking signal is selected ensure that the signal-to-noise ratio less than unity for co-frequency with the highest level of radiation. For other frequencies, spurious emissions are excessive levels of masking signal that unreasonably impairs the electromagnetic and the environment.
The objective of the proposed method is ensuring that Tsoi against leakage of information through the channels of pre without compromising electromagnetic and environmental conditions.
The technical result achieved by the proposed method lies in the GII additional noise signal.
The essence of the method consists in the following: Tsoi and outgoing wires for the side signal can be represented as parasitic electromagnetic vibrator (emitter). Therefore, the transformation of the electromagnetic field surrounding Tsoi, can be provided by changing the parameters of the emitter, which is achieved by its interaction with an additional antenna having variable parameters and the Fresnel zone [7, S. 593], [8, S. 115], which has protected Tsai, representing the sphere of radius
R=2D2/(if DLLL/ 2),
where D is the largest dimension of the antenna,- wavelength side of electromagnetic radiation.
The limits of variation of parameters associated electromagnetic vibrators are determined by the induced EMF , , which allows to determine the radiation power mnogovershinnoe antenna, the input impedance of each of the vibrator and the mutual influence of elements of the antenna system.
Closest to the technical nature of the proposed method physical model of the radiation of two related electromagnetic vibrators, one active and the other passive and terminals of the latter are closed on some the e field in the far zone radiation is a superposition of fields, created by radiation of active and passive vibrators. The intensity of this field is defined as [10, S. 35]
where Em1and Em2the amplitude intensities of the electromagnetic fields generated respectively active and passive vibrators (- circular frequency of the radiation,
- wavelength radiation,
r is the distance from the source to a point located in the far zone radiation,
d is the distance between emitters,
- the angle of the direction of radiation,
- the phase shift between the currents in the dipoles.
Value (kd Sin+) determines the phase shift between the fields of active and passive vibrators in the observation point and is a random variable due to the randomness.
As shown in [11, S. 378], angleequal to the sum of the angles of phase shift of the voltage induced in the passive vibrator, relative to the current in the active vibrator2)
Angle1depends on the distance between the vibrators, and the angle2is determined by the length of the passive vibrator, that is, the degree of its deviation from resonance. Passive vibrator can act as a Director or reflector, and the reflector should be the nature of inductive and Director - capacitive resistance [11, S. 382]. When configured in a half-wave resonance active vibrator reflector should be slightly longer, and the Director is slightly shorter than half the wavelength.
In the proposed method, the load resistance of the antenna, which plays the role of a passive vibrator, varies in the range from 0 torandom values, and time. When the load resistance is equal to 0, passive vibrator becomes a reflector, and when the load resistance is equal tohe is broken into two parts and the antenna system consists of one active vibrator and two Directors, this will change as the shape of the pattern and the direction of its maximum.
When Promega random values, and in the direction of.
The analysis of the radiation parameters of the system of two electromagnetic vibrators, one active and the other terminals are shorted to a variable load, leads to the conclusion that when the load changes of the second vibrator randomly, by changing parameters and radiation pattern of the antenna system, in the far zone radiation is a random modulation of the intensity vector of the electromagnetic field in amplitude and phase.
The above is confirmed by the antenna patterns and vector diagram of voltages and currents in the antenna, consisting of active and passive vibrators given in [11, Fig.221 and 222].
The above model adequately reflects the process of masking undesired radiation in a narrow frequency range. If Tsoi has side radiation in several areas of the spectrum, the antenna system should consist of a variety of vibrators of different geometric dimensions, configuration, spatial location, designed for mid-frequency spectra of radiation, managed workloads, changing randomly.
Thus, if Tsoi, around which there are poroshok antenna system to change randomly, for example, using signals generated by the generators of noise, electromagnetic field surrounding Tsoi will also change randomly law that does not allow radio razvedka to extract the information.
The drawing shows an example implementation of a device that implements the proposed method.
The device contains the following nodes:
1 - technical means of information processing (Tsoi);
2 - antenna;
3 - controlled load;
4 - noise generator.
Tsai 1, containing, for example, the transceiver information 1.1 cable 1.2 power and communication line 1.3, is a source of high frequency natural electromagnetic radiation (active adult), the envelope of which may contain confidential information.
The antenna 2 is designed to convert randomly electromagnetic field surrounding Tsai 1, and is a passive Dildo.
Managed load 3 connected to the terminals of the antenna 2, is intended for random changes in a wide range of complex impedance of the antenna 2.
The noise generator 4 connected to the input of the controllable load 3, is designed to generate a random noise signal.
As the antenna 2 can be, for example, broadband is CAD 3 can be performed optocoupler, for example, type PVG61 or PVN012, the resistance of the first may vary from 0.15 to 108Ohms, and the second from 0.05 to 107Ω . The optocoupler consists of two field photosensitive 3.1; 3.2 and 3.3 led that provides galvanic isolation between the noise generator 4 and the antenna 2.
The noise generator 4 may be performed, for example, according to the scheme given in , in which instead of the antenna WA should include a managed load 3 of the proposed device.
The device that implements the proposed method, as follows.
Protected Tsoi 1 is placed in close proximity to the antenna 2 so that it together with the antenna was located in the zone of the Fresnel antenna 2, which is a sphere of radius R. as in his work Tsoi 1 generates a high-frequency oscillations, which can carry the information signal, it together with its cables is a kind of antenna, the radiating these fluctuations in the surrounding space.
Thus, the first factor influencing the degree of masking spurious emissions is small, about 1/10 the wavelength of the spurious signals, the distance between TSO 1 and antenna 2, which provides a relatively strong correlation of these vibrators and Righ side of electromagnetic radiation, is the fact that the change in complex impedance load 3 connected to the antenna 2, leads to the change of the impedance of the antenna 2 in the zone of the Fresnel other electromagnetic emitter, which is Tsoi 1. In the antenna system of strongly bound electromagnetic vibrators radiation resistance of the antenna system, and therefore the energy radiated by the system depend on the impedance of both vibrators.
It should be noted that, as the noise generator 4 is not electrically connected with the antenna 2, then there is no energy transfer from the antenna, and thus the coincidence of changes in the electromagnetic field surrounding Tsai 1, is provided without increasing the energy of this field is that, in comparison with the prototype, where the increase of energy takes place, improves the electromagnetic and the environment around Tsoi.
Processes similar to those discussed above, were investigated in , where it was shown that the electromagnetic field created by the transmitter, in mechanical contact with a variable resistance, generates a secondary electromagnetic field that interacts with the primary floor is Menno contact becomes impossible.
To test the reachability of the claimed technical result was assembled model of the device, the design of which is a plane of dielectric material (wooden table), the surface of which was located broadband dipole antenna type “butterfly” size h mm with vibrators made of copper mesh.
As the simulator Tsoi was chosen as the standard high-frequency generator G4-107. To the agreed load generator was connected emitter - conductor mgsv 0.5 length 1000 mm Generator and emitter was located on the surface of the dipole butterfly on a wooden stand, height 50 mm
As a simulator noise generator was used low-frequency signal generator G6-28.
As the measurement setup was used measuring the radio-type STV-401”, selective microvoltmeter type “Unipan-233 and broadband antenna type “HUF-Z2”. The spacing between the simulator Tsoi and the radio antenna was about 4 m
The experiment consisted of radiation by the simulator Tsoi high-frequency signals in the frequency range from 30 to 300 MHz, modulated with 1 kHz at a level of high-frequency signals at the output of the generator 100 dB/µv, and so the current measurement of high frequency signals, the radio STV-401”, measurement of the levels of the information signal (the envelope of the emitted signal and the masking signal at frequencies of 2, 3, and 4 kHz microvoltmeter “Unipan-233”.
Based on the experimental results the following conclusions.
Comparison of the levels of the high-frequency signal at the input of the receiver with and without masking masking showed that masking reduces the energy radiated by the simulator Tsoi high-frequency signals by 2-3 dB.
Registered a decrease in the energy of the information signal (envelope) for 2-3 dB in the presence of masking.
The obtained masking signals have a level equal to or above the level of the envelope of the information signal. Thus the possibility of a simple means to provide a channel leakage ratio signal/noise ratio less than one.
Thus, the above material suggests that it is possible to transform a side of the electromagnetic field surrounding Tsai, randomly without increasing the energy of this field, since the energy of the noise signal is not transmitted to the antenna, and is used only to control the load resistance of the antenna, which results in the result if the requirements but masking radiation to provide more blah is ü the claimed technical result.
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The method of protection technical means of information processing from information leakage through side channels of electromagnetic radiation and interference, which generate a noise signal using the antenna converts the random law of electromagnetic field surrounding the technical means of information processing, characterized in that the said means are placed near the antennas in the Fresnel zone, and converting the electromagnetic field randomly carried out by changing the resistance of the controlled loading of the antenna synchronously with the noise signal when you connect the noise generator to the input of the controlled loading of the antenna.
FIELD: technologies for preventing interception of data.
SUBSTANCE: transferred signal is concealed via adding noises to communication line in speech frequency range with linear addition of speech data signal with noise signal of higher level. Concealment is removed via adaptive filtration of received signal with compensation of noise component and separation of data component. Addition of noises to communication line is performed from the side of sensor. Noise signal during addition of noises and adaptive filtration is formed of a sum of counts of several noise series with nonevent sizes via their random querying. At the beginning of each communication session a signal is sent to side of receiver, characterizing order of querying of series, and starting signal, providing for synchronism of noises addition and filtering processes. All operations are performed by means of microprocessors, mounted on both sides of communication line, dependently of loaded software providing for change of direction of transmission and protection of speech data signal. Invention allows to simplify protection while providing for absolute confidentiality of transmitted data.
EFFECT: higher reliability.
6 cl, 4 dwg
FIELD: radio engineering; secret intelligence protected radio communication systems.
SUBSTANCE: proposed radio communication system incorporating provision for suppressing enemy's radio communication means and radio control channels has information subsystem, noise jamming subsystem, noise memory subsystem, information subsystem elements, and subsystem elements interface unit; each element of information subsystem is made in the form of multichannel time-division radio station; each element of noise jamming subsystem is made in the form of time division multichannel radio station, and each of noise jamming subsystem elements is made in the form of barrage jamming transmitter built around noise signal generating driver; used as drivers are self-stochastic generator operating in different frequency bands.
EFFECT: enhanced intelligence protection of communication channels, simplified design, enhanced reliability.
2 cl, 13 dwg
FIELD: methods for protection of an active radar against antiradar missiles.
SUBSTANCE: in the method and device for protection of radar against antiradar missiles accomplished are radiation of sounding signals, detection of antiradar missiles, guidance of anti-aircraft missiles on the antiradar missile, destruction of the anti-radar missile by blasting of the warhead of the anti-aircraft missile, guidance of the anti-aircraft missile at least during a time period directly preceding the blasting of the warhead of the anti-aircraft missile, all this is conducted on the trajectory passing in the vicinity of the imaginary line connecting the antiradar missile and the radar, in this case constantly are determined the distance from the radar to the antiradar missile Dr-arm, from the radar to the anti-aircraft missile Dr-aacm and from the anti-aircraft missile to the antiradar missile Daacm-acm, and at the time moments leading the moments of radiation of the radar sounding signal by value t=(Dr-aacm+Daacm-arm-Dr-arm)/v, where v - velocity of light, commands are given from the radar to the anti-aircraft missile for radiation of a signal simulating the radar signal.
EFFECT: reduced dynamic errors of guidance of anti-aircraft missile on antiradar missile.
3 cl, 6 dwg
FIELD: espionage protection techniques.
SUBSTANCE: method includes serial scanning of target surface by nonlinear locator, recording and processing received response in PC with displaying of positions of semiconductor devices. In case of appearance of response on target surface on command from PC visible laser is enabled, response points are lighted by it, pictured using digital camera and recorded in PC. Responses are process in conjunction with target surface image and integral picture of responses is built. On basis of received picture additionally visually detected are potentially possible places for placing semiconductor devices, and also trajectories of tracing of communications on target surface, structures of inbuilt metal construction and anomalies in said structures.
EFFECT: higher precision, higher efficiency, broader functional capabilities.
FIELD: radio communications.
SUBSTANCE: system has transmitting portion, which contains clock pulse generator 1, first and second D-code generators 21-22, first and second generator of double frequency manipulation 31-32, adder 4, modulator 5, frequencies synthesizer 6, pseudo-random numbers generator 7. said portion is connected through broadcast line 8 to receiving portion, which has demodulator 9, frequencies synthesizer 10, pseudo-random numbers 11, signals selector 12, clock pulses generator 13, block for selecting additional series 14, block for folding additional series 15, solving block 16. new set of significant features provides for possible implementation of distributed receipt with code structure of specific orthogonal quadruple-encoded series without expansion of available frequency resource.
EFFECT: broader functional capabilities, higher trustworthiness, higher efficiency, higher interference resistance.
2 cl, 5 dwg
FIELD: radio engineering, possible radio-technical reconnaissance of radio-electronic means of enemy.
SUBSTANCE: radio-technical reconnaissance station contains antenna device 1, receiver 2, bearing device 3, analyzer 4 of received signal parameters, device 5 for memorizing and processing received information, telemetric device 6, receiving antennae 7-9, block 10 for readjustment, first 11 and second 23 heterodynes, mixers 12-14 and 24, amplifiers 17-19 of first intermediate frequency, detector 20, first 21 and second 31 delay lines, key 22, amplifier 25 of second amplification frequency, multipliers 26,27 and 30, narrowband filters 28,29 and 32, phase detector 33, phase meters 34 and 35, engine 15 and supporting generator 16.
EFFECT: expanded area of reconnaissance and increased number of detected radio-electronic means due to positioning of radio-technical reconnaissance station onboard the helicopter.
FIELD: technology for generating artificial interference for concealing electromagnetic channels leaking speech information.
SUBSTANCE: in accordance to invention, method includes generation, amplification and emission of concealing noise signal, and also substantial changes and additions, namely: noise signal is amplified in mode B or AB, pulse automatic-compensating stabilization of power amplifier powering voltage is utilized, stabilized voltage is filtered by upper frequencies filter, lower limiting frequency is higher than upper frequency of audible spectrum, but lower than frequency of pulse stabilizer.
EFFECT: increased efficiency of method while power for concealed equipment is delivered by industrial alternating-current network.
FIELD: radio engineering, namely, equipment for generating artificial interference, possible use for protecting information from leaking along vibro-acoustic channel from a room.
SUBSTANCE: in accordance to method for protecting speech information along vibro-acoustic channel, interference is generated for masking speech signal, while interference is formed as M-series of pulses with following transformation, while transformation of M-series of pulses is performed in form of generation of vibration impact signals, by which speech signal is multiplicatively masked, while M-series of pulses is generated from period to period in accordance to random rule.
EFFECT: increased efficiency of technical means for information protection, decreased acoustic radiations, interfering with negotiations, radiations, affecting operation of nearby radio-electronic means, and also disclosing a structure of noise interference, decreasing probability of it being filtered.
FIELD: engineering of equipment for counteracting commercial and industrial espionage.
SUBSTANCE: device includes auxiliary transmitting-receiving antenna, antenna commutator, controllable interference generator, radio radiation detector and additional generator of interference with individual antenna. Launch circuit of controllable interference generator is connected to of radio radiation detector. The latter is made with possible recording of beginning of emission of radio interface of cell phone during its communication with external device, determining presence and frequency channel of unsanctioned communication with radio interface and adjustment of frequency of controlled interference generator. Commutator is enabled with possible switching of auxiliary antenna from input of radio emission detector to output of controllable interference generator for suppressing unsanctioned data transfer through radio interface. Output of radio radiation detector is connected to controlling inputs of commutator and controlled interference generator. For additional interference generator, mode of permanent generation of interference is set in radio spectrum of global positioning systems, excluding capability for determining coordinates of cell phone.
EFFECT: increased efficiency of cell protection from unsanctioned pickup of information from radio interface with reliable suppression of attempts of determining current location of cell phone.
3 cl, 1 dwg
FIELD: technology for creating artificial interference for masking speech information in industrial network of alternating current.
SUBSTANCE: device (dwg. 1) contains rectifier 2 and, connected serially, noise signal generator 4, noise signal power amplifier 5 and emitter 6, in noise signal amplifier 5, mode B or AB is implemented, between rectifier 2 and power chain of noise signal generator 4 and power amplifier of noise signal, impulse automatic-compensation voltage stabilizer 8 is inserted, at output of which upper frequency filter is mounted, lower cut frequency of which is higher than upper frequency of audible spectrum, but lower than clock frequency of impulse automatic-compensation voltage stabilizer 8.
EFFECT: increased protection of sound amplification equipment from possible electromagnetic leakage of sound information along power chains.