RU2541122C2 - Method of checking information security effectiveness - Google Patents

Abstract

FIELD: physics.

SUBSTANCE: method comprises measuring signal and noise octave levels at a selected control point; determining the radius of the optimum area of arranging vibroacoustic signal sensors; calculating the optimum number of vibroacoustic signal sensors capable of intercepting speech over technical information leakage channels (TILC); calculating the maximum formant speech intelligibility from the estimated TILC; based on the values of maximum formant speech intelligibility obtained via separate TILC, using a developed relationship which takes into account the mutual "weight" of the TILC, determining coordinates of the optimum point of arranging IAS in a facility; determining formant speech intelligibility for the controlled TILC for optimum arrangement and orientation of IAS in a facility; calculating maximum formant speech intelligibility from the set of estimated TILC, which is converted to an output factor - an integral value of verbal speech intelligibility intercepted from the facility; comparing the output factor with a standard value, from which the conformity of evaluation results with voice information security requirements is determined.

EFFECT: high reliability of evaluating voice information security.

Description

The invention relates to the field of monitoring information security, in particular to methods of instrumental and computational monitoring of the effectiveness of protection of a speech signal from leakage through technical channels.

Closest to the claimed method according to a number of essential features, the method implemented by the device (see, for example, Patent for invention, Russia, No. 2278424, IPC G10L 15/00, publ. 06/20/2006).

, N - число октавных полос и ориентации рабочей оси излучения ИАС по нормали к плоскости j-го ТКУИ, установке К (по одному на каждый j-й ТКУИ) датчиков виброакустического сигнала (ДВАС) на нормативном удалении от ТКУИ, приеме виброакустических сигналов (ВАС) каждым ДВАС, определении К отношений «сигнал/шум» для каждой из N октавных полос и расчете усредненного значения максимальной разборчивости речи. Недостатками описанного способа являются:This method is based on expert determination of the totality of technical channels of information leakage, placement of an acoustic signal source (IAS) at a standard distance from one (j-th) technical channel of information leakage (TCUI) from the selected set, setting standard radiation levels of IAS in n-octave bands where $$\overline{n=\mathrm{one},N}$$

, N is the number of octave bands and the orientation of the working axis of the IAS radiation along the normal to the plane of the j-th TCI, the installation of K (one for each j-th TCI) of vibro-acoustic signal sensors (DVAS) at a standard distance from the TCI, receiving vibro-acoustic signals (YOU ) by each DVAS, determining K signal-to-noise ratios for each of the N octave bands and calculating the average value of the maximum speech intelligibility. The disadvantages of the described method are:

- the impossibility of taking into account the effect of noise reduction of YOU due to the correlation processing of its implementation, adopted by spatially separated DVAS within one TKUI, because it suggests using only one sensor for each evaluated TKUI, and does not contain additional mathematical operations that reflect the process of secondary processing of intercepted speech;

- the mismatch of the calculated verbal intelligibility of speech to its actual maximum due to the absence in the known method of a criterion for choosing the optimal location of IAS relative to the totality of evaluated TCI;

- the difficulty of implementing this method in the presence of a significant amount of potentially dangerous TCUI in the room (which is often encountered in practice) spatially distributed over the building envelope (for example, acoustic TCUI: doorway crevice; through outlet; entrance to the ventilation system, vibroacoustic - wall premises; battery), in this case, according to the described method, the device for its implementation is significantly complicated, and implies the presence of many independent ICE, the number of which is of the estimated number of TKUI.

The technical result to which the present invention is directed is to increase the effectiveness (reliability) of information security control against unauthorized interception, under the conditions of an attacker using integrated spatially distributed systems for intercepting a speech signal using acoustic and vibro-acoustic TCUIs that implement the algorithms for correlation processing of received speech fragments.

, ориентации рабочей оси излучения ИАС по нормали к плоскости j-го ТКУИ и установке нормативных уровней излучения ИАС в n-х октавных полосах, где $$\overline{n=1,N}$$

, N - число октавных полос, устанавливают ДВАС относительно j-го ТКУИ на рабочей оси излучения ИАС в первое положения - на нормативном удалении и во второе - на удалении 1-3 м от первого положения и определяют для каждой из N октавных полос с помощью ДВАС уровни ВАС в n-й октавной полосе излучения для j-го ТКУИ в первом и втором положениях L_nj1 и L_nj2, где 1, 2 - первое и второе положения установки ДВАС, с использованием полученных значений уровней ВАС L_nj1, L_nj2 рассчитывают радиус оптимальной зоны размещения ДВАС для n-й октавной полосы излучения по j-му ТКУИ r_nj, рассчитывают оптимальный пространственный разнос соседних ДВАС для среды (материала) j-го ТКУИ r_j по формуле: r_j=0,75·10^-3 c_j, где c_j - скорость распространения акустического сигнала в среде j-го ТКУИ, и сравнивают его значение со значением радиуса оптимальной зоны размещения ДВАС для n-й октавной полосы излучения по j-му ТКУИ r_nj, если r_nj≥r_j, то определяют максимальное количество ДВАС, участвующих в суммировании ВАС в n-й октавной полосе излучения для j-го ТКУИ, и с использованием значения которого рассчитывают суммарные октавные уровни виброакустических сигнала и шума в n-й октавной полосе излучения для j-го ТКУИ L_сnjΣ и L_шnjΣ, где ш, с - обозначение сигнала и шума, и определяют по разнице их значений октавное отношение сигнала к шуму в n-й октавной полосе излучения для j-го ТКУИ E_n, если r_nj<r_j, то рассчитывают октавное отношение сигнала к шуму в n-й октавной полосе излучения для j-го ТКУИ E_n вычитанием значения суммарного октавного уровня виброакустического шума L_шnjΣ из значения уровня ВАС, полученного при установке ДВАС в первом положении относительно j-го ТКУИ L_nj1, определяют коэффициент восприятия ВАС в каждой n-й октавной полосе излучения для j-го ТКУИ P_n и с использованием значений которых, полученных для N октавных полос, рассчитывают максимальную формантную разборчивость ВАС A для j-го ТКУИ, определяют отношение максимального значения формантной разборчивости из всех J ТКУИ $$\underset{j=\overline{1,J}}{\max A_j}$$

к сумме значений максимальных формантных разборчивостей, полученных по остальным j-м ТКУИ D, вычисляют 0,39-0,2 $$\left(\underset{j=\overline{1,J}}{\max }{A}_j\right)$$

и сравнивают полученное значение со значением D, если D≤0,39-0,2 $$\left(\underset{j=\overline{1,J}}{\max }{A}_j\right)$$

, то размещают ИАС на высоте 1,5 м от пола помещения на пересечении нормали к плоскости ТКУИ с максимальным значением формантной разборчивости и нормали к плоскости ТКУИ, имеющего наибольшее значение максимальной формантной разборчивости ВАС из всех ТКУИ, лежащих в плоскостях, перпендикулярных ТКУИ с максимальным значением формантной разборчивости, если D>0,39-0,2 $$\left(\underset{j=\overline{1,J}}{\max }{A}_j\right)$$

, то размешают ИАС на нормативном удалении от ТКУИ с максимальным значением формантной разборчивости $$\underset{j=\overline{1,J}}{\max }{A}_j$$

, повторяют процедуры от установки относительно j-го ТКУИ ДВАС на рабочей оси излучения ИАС в два положения: на нормативном удалении и на удалении 1-3 м от него и до включительно определения максимальной формантной разборчивости ВАС A_j для j-го ТКУИ, определяют максимальное значение формантной разборчивости речи в помещении A по совокупности оцененных J ТКУИ при оптимальном размещении ИАС, с использованием значения которого рассчитывают интегральное значение словесной разборчивости ВАС в помещении W и сравнивают его значение с нормативным значением W_н, где н - обозначение нормативного значения, по результату сравнения делают вывод об эффективности защиты информации.The technical result is achieved by the fact that in the known method of monitoring the effectiveness of information security, which consists in determining the number J, location and type of TKUI, placing IAS at a standard distance from the j-th TKUI, where $$\overline{j=\mathrm{one},J}$$

, the orientation of the working axis of the radiation of IAS along the normal to the plane of the j-th TCI and setting the standard levels of radiation of IAS in the n-octave bands, where $$\overline{n=\mathrm{one},N}$$

, N is the number of octave bands, establish the DVAS relative to the jth TCI on the working axis of the IAS radiation in the first position - at a standard distance and in the second - at a distance of 1-3 m from the first position and determine for each of the N octave bands using DVAS YOU levels in the n-th octave emission band for the j-th TCIM in the first and second positions L _nj1 and L _nj2 , where 1, 2 - the first and second positions of the DVAS installation, using the obtained values of YOU levels L _nj1 , L _nj2 calculate the radius of the optimal DVAS placement zone for the n-th octave emission band along the j-th TC And r _nj, calculated optimal separation distance adjacent to Dvas medium (material) j-th TKUI r _j using the formula: r _j = 0.75 · 10 ^-3 c _j, where c _j - propagation speed of the acoustic signal in the j-th medium TKUI, and compare its value with the value of the radius of the optimal zone for the placement of ICE for the n-th octave emission band according to the j-th TCUI r _nj , if r _nj ≥r _j , then determine the maximum number of DIC participating in the summation of YOU in the n-th octave the emission band for the j-th TCI, and using the value of which the total octave levels of vib oakusticheskih signals and noise in the n-th octave band radiation for j-th TKUI L _snjΣ and L _shnjΣ where br, s - signal designation and noise, and is determined by the difference of their values octave signal to noise ratio in the n-th octave emission band for the j-th TCUI E _n , if r _nj <r _j , then calculate the octave signal-to-noise ratio in the n-th octave emission band for the j-th TCI E _{n by} subtracting the value of the total octave level of vibro-acoustic noise L _wnjΣ from the BAC level, obtained when installing DVAS in the first position relative to the j-th TKUI L _nj1 , determine the coefficient the perception factor of YOU in each n-th octave band of radiation for the j-th TCIM P _n and using the values of which obtained for N octave bands, calculate the maximum formant intelligibility of YOU A for the j-th TCIS, determine the ratio of the maximum value of formant intelligibility of all J TKUI $$\underset{j=\overline{\mathrm{one},J}}{\max A_j}$$

to the sum of the values of the maximum formant intelligibility obtained from the remaining j-th MCUI D, 0.39-0.2 $$\left(\underset{j=\overline{\mathrm{one},J}}{\max }{A}_j\right)$$

and comparing the obtained value with the value of D, if D≤0.39-0.2 $$\left(\underset{j=\overline{\mathrm{one},J}}{\max }{A}_j\right)$$

, then place the IAS at a height of 1.5 m from the floor of the room at the intersection of the normal to the TKUI plane with the maximum value of the formant intelligibility and the normal to the TKUI plane having the highest value of the maximum formant intelligibility of the YOU from all TKUI lying in planes perpendicular to the TKUI with the maximum value formant intelligibility if D> 0.39-0.2 $$\left(\underset{j=\overline{\mathrm{one},J}}{\max }{A}_j\right)$$

, then IAS is placed at a standard distance from the TCUI with the maximum value of formant intelligibility $$\underset{j=\overline{\mathrm{one},J}}{\max }{A}_j$$

, repeat the procedure from the installation relative to the j-th TKUI DVAS on the working axis of the IAS radiation in two positions: at the standard distance and at a distance of 1-3 m from it to inclusively determining the maximum formant intelligibility of the BAS A _j for the j-th TKUI, determine the maximum the value of the formant intelligibility of speech in room A based on the totality of the estimated J TCUIs at the optimal placement of IAS, using the value of which the integral value of the verbal intelligibility of YOU in room W is calculated and its value is compared with the normative their assignment W _n, where n - the designation of the normative value of the result of the comparison to draw conclusions about the effectiveness of information security.

The solution of the problem and obtaining the technical result is provided by introducing into the known method a number of sequentially implemented procedures that allow taking into account the effects of synchronous multi-position pickup of the information signal and the integration of speech fragments. These procedures are:

instrumental and computational determination of the radius of the optimal zone for the placement of ICE for the estimated TKUI;

calculation of the optimal number of DVAS potentially capable of intercepting speech according to the estimated TKUI;

the calculation of the maximum formant speech intelligibility according to the estimated TCI, on the basis of a new system of mathematical relationships based on elements of the theory of correlation analysis of YOU and allowing to take into account the effects of coherent summation (secondary processing) of the speech signal;

determination of the coordinates of the optimal point of placement of IAS in the room, based on the obtained dependence, taking into account the mutual "weight" of the estimated TCI;

calculation of the maximum value of the formant intelligibility of speech intercepted from the premises according to the totality of the evaluated TKUI, based on the introduced probabilistic relation reflecting the procedure of complexing (tertiary processing) of speech fragments.

The content of these procedures was determined as follows. An analysis of the features of the process of monitoring the security of speech information circulating in a room determines the need for its consideration from the point of view of a complex system, the result of which is the fact of restoration of an acoustic signal (speech). At the same time, the quality of the functioning of this system is uniquely determined by the combination of parameter values (characteristics) that need to be optimized. These parameters include the radius of the optimal DVAS placement zone, the optimal (maximum) number of DVAS placed within the optimal zone subject to the conditions of the necessary spatial separation between the adjacent DVAS, the optimal location of the voice information source, as well as the calculation method.

During the control, the entire set of TKUI in the room can be divided into TKUI of concentrated and distributed type (see, for example, Lobov V.A., Chernyshev P.V., Siromashenko A.V. Evaluation of the possibilities of intercepting voice information when implementing the multi-channel pickup method Scientific and practical journal "Information Security Issues" - M .: FSUE "VIMI" No. 4 (79) 2007, p.27-35).

It is necessary to consider a technological hole in the enclosing structure of the room (a slot of a door or window vestibule, a through socket, an entrance to the supply and exhaust ventilation system, etc.) as an acoustic concentrated-type TCUI.

It is necessary to consider two or more technological holes spatially spaced within the same plane of the building envelope as an acoustic TKUI of a distributed type.

As a concentrated-type vibroacoustic TKUI, it is necessary to consider an element of the building's engineering and technical system (communication) located (passing) within the premises (battery, supply and exhaust ventilation system, cable shaft, ground loop, etc.).

It is necessary to consider the plane of the building envelope (wall, floor, ceiling) or an element of the plane (door, window glazing canvas) as a distributed-type vibro-acoustic TCUI.

During the instrumental assessment, an acoustic noise signal in octave bands with geometric mean frequencies of 125, 250, 500, 1000, 2000, 4000, and 8000 Hz (frequency band 90-11200 Hz) with a normal probability density distribution of instantaneous values within each octave band. The test signal can be emitted simultaneously in all octave bands or sequentially in each individual band.

At the stage of selecting control points, a qualitative assessment of the sound and vibration isolation of the room is carried out in order to determine the most potentially dangerous TKUI. The architectural and planning decisions of the room, the design features of its enclosing structures (walls, floors, doors, windows) and engineering systems are analyzed, the pipelines of various life support systems are examined, heterogeneities in the building structures are revealed, and the structural features of the decoration elements are examined. The spatial relations of the building envelope and the elements of technical systems are specified relative to the established boundary of the controlled area and relative to buildings, structures, etc. adjacent to the controlled area. The standard value of verbal speech intelligibility for the evaluated room is determined, for compliance with which it is necessary to carry out control. The result of these measures is the identification of the most potentially dangerous TKUI in the room, within which control points are selected. The control points are the places for the possible installation of the internal combustion engine, in which instrumentation control measures the levels of the acoustic signal and noise.

Based on the foregoing, the essence of the proposed method can be explained by the following steps.

, j - номер ТКУИ, J - количество ТКУИ) для каждого ТКУИ в помещении в следующем порядке:1. Determine the maximum formant speech intelligibility A _j ( $$j=\overline{\mathrm{one},J}$$

, j is the number of TKUI, J is the number of TKUI) for each TKUI in the room in the following order:

a) place the IAS at a standard distance from the jth TKUI (see, for example, Bortnikov A.N., Lobov V.A., Siromashenko A.V., Chernyshev P.V. Results of experimental studies evaluating the possibilities of intercepting voice information at the implementation of two-channel pickup methods. Scientific and practical journal "Information Security Issues" - M .: FSUE "VI-MI" No. 1 (76) 2007, pp. 11-17):

- for acoustic TCUI concentrated type at a height of 1.5 m from the floor opposite the examined technological holes at a distance of 1 m from it;

- for acoustic TKUI distributed type at a height of 1.5 m from the floor opposite the technological hole having the largest area of all holes TKUI, at a distance of 1 m from it;

- for vibro-acoustic TCUI of a concentrated type at a height of 1.5 m from the floor opposite the geometric center of the examined element of the engineering system at a distance of 1 m from it;

- for vibro-acoustic TCUI distributed type at a height of 1.5 m from the floor at a distance of 1 m from the surveyed plane of the enclosing structure and 1 m from the vertical plane of the enclosure, perpendicular to the subject;

orient the working axis of the IAS emitter along the normal to the plane of the j-th TKUI;

, N - число октавных полос излучения ИАС (например, при интегральном уровне $$L_{\int }=70дБ$$

на частотах частот ƒ₁=125 Гц, ƒ₂=250 Гц, ƒ₃=500 Гц, ƒ₄=1000 Гц, ƒ₅=2000 Гц - $$L_{{\displaystyle \int 1}}=57$$

дБ, $$L_{{\displaystyle \int 2}}=66$$

дБ, $$L_{{\displaystyle \int 3}}=66$$

дБ, $$L_{{\displaystyle \int 4}}=61$$

дБ, $$L_{{\displaystyle \int 5}}=56$$

дБ соответственно);establish, according to regulatory data, in the n-octave IAS emission bands the radiation level (see, for example, for Russian speech, NB Pokrovsky. Calculation and measurement of speech intelligibility. - M .: State. Publishing House of Literature on Communications and Radio, 1962 , 391 p.), Where $$n=\overline{\mathrm{one},N}$$

, N is the number of octave emission bands of IAS (for example, at the integral level $$L_{\int }=70dB$$

at frequencies ƒ ₁ = 125 Hz, ƒ ₂ = 250 Hz, ƒ ₃ = 500 Hz, ƒ ₄ = 1000 Hz, ƒ ₅ = 2000 Hz - $$L_{{\displaystyle \int \mathrm{one}}}=57$$

dB $$L_{{\displaystyle \int 2}}=66$$

dB $$L_{{\displaystyle \int 3}}=66$$

dB $$L_{{\displaystyle \int \mathrm{four}}}=61$$

dB $$L_{{\displaystyle \int 5}}=56$$

dB, respectively);

b) establish a DVAS on the working axis of the IAS emitter at a standard distance (see, for example, Bortnikov A.N., Lobov V.A., Siromashenko A.V., Chernyshev P.V. Results of experimental studies evaluating the possibilities of intercepting voice information at Implementation of two-channel pickup methods. Scientific and practical journal “Information Security Issues” - M .: FSUE “VIMI” No. 1 (76) 2007, pp. 11-17) from the jth TKUI and for each of the N octave bands following measuring and calculation operations:

when the IAS is switched off in the n-th octave emission band for the j-th TCIM, the level of vibro-acoustic noise L _wnj , where w is the noise;

when the IAS is switched on, in the n-th octave emission band for the j-th TCI, the level of the mixture of vibroacoustic signal and noise L _{(s + w) nj} , where w + s is the mixture of signal and noise;

in the n-th octave emission band for the j-th TCI, the BAC octave level L _{nj is} calculated by the formula:

$$L_{nj}=101g\left[{10}^{0,\mathrm{one}\cdot L_{(\mathrm{from}+w)nj}}-{10}^{0,\mathrm{one}\cdot L_{wnj}}\right];(\mathrm{one})$$

they move the DVAS by a distance of R = 1-3 m from the initial installation point on the working axis of the NAS emitter relative to the j-th TCUI (it is recommended to take the value of the distance R from the interval 1-3 m, the lower boundary of which corresponds to acoustic TCUI and vibro-acoustic TCUI of a distributed type, and upper vibro-acoustic TCUI of concentrated type);

when the IAS is switched off in the n-th octave emission band for the j-th TCI, the level of vibro-acoustic noise L _шnj (R);

when the IAS is switched on, in the n-th octave emission band for the j-th TCI, the level of the mixture of vibro-acoustic signal and noise L _{(s + w) nj} (R);

in the n-th octave emission band for the j-th TCUI, the octave level BAC L _nj (R) is calculated by the formula:

$$L_{nj}(R)=101g\left[{10}^{0,\mathrm{one}\cdot L_{(\mathrm{from}+w)nj}(R)}-{10}^{0,\mathrm{one}\cdot L_{wnj}(R)}\right];(2)$$

calculate in the n-th octave emission band for the j-th TCUI the radius of the optimal zone r _{nj for the} placement of ICE according to the formulas:

for vibro-acoustic distributed measuring system:

$$r_{nj}=\sqrt{\frac{{10}^{0,\mathrm{one}\cdot L_{nj}(R)}\cdot R^2}{{10}^{0,\mathrm{one}\cdot (L_{nj}-6)}}};(3)$$

for vibro-acoustic TCUI of concentrated type:

$$r_{nj}=\frac{6R\ln 10}{\ln 10\left[L_{nj}-L_{nj}(R)\right]};(\mathrm{four})$$

calculate for the j-th TCI according to the known speed of the acoustic signal in its medium (see, for example, Rzhevkin SN, Lecture Course on Sound Theory. - M.: Moscow State University, 1960, 335 pp.) the optimal spatial separation of the installation of neighboring DVAS according to the formula:

$$r_j=0,75\cdot {10}^{-3}{c}_j,(5)$$

where c _j is the propagation velocity of the acoustic signal in the medium of the j-th TCI.

For example:

- when evaluating acoustic TKUI and vibro-acoustic TKUI distributed type for air r _j = 0.3 m;

- when evaluating concentrated-type vibro-acoustic TCUI - r _j for the material of the examined structure, for example, aluminum r _j = 2.3 m, cast iron r _j = 2.0 m, iron r _j = 1.45 m, etc. ;

compare r _nj with r _j for the j-th TKUI:

if r _nj ≥r _j , then the maximum number of ICEs participating in the summation of YOU in the n-th octave band of radiation is calculated for the j-th TCGI using the formulas:

for vibro-acoustic distributed measuring system:

$$m_{nj}=C\left[\frac{\sqrt{\left(r_{nj}^2+\mathrm{one}\right)-\mathrm{one}}}{r_j}\right]+\mathrm{one};(6)$$

for vibro-acoustic TCUI of concentrated type:

$$m_{nj}=C\left[\frac{r_{nj}}{r_j}\right]+\mathrm{one},(7)$$

where C is the integer part of the value in parenthesis;

in the n-th octave emission band for the j-th TCIM, the attenuation coefficient of the BAC octave level between adjacent ICEs ΔL _{nj is} calculated by the formula:

$$\Delta L_{nj}=\frac{6}{m_{nj}-\mathrm{one}};(8)$$

calculate in the n-th octave emission band for the j-th TCUI the total octave level of YOU L _сnjΣ according to the formula:

$$L_{cnj}{}_{\Sigma }=101g\left(m_{nj}{\displaystyle \sum _{k-\mathrm{one}}^{m_{nj}-\mathrm{one}}{10}^{\frac{L_{nj}-(k-\mathrm{one})\Delta L_{nj}}{10}}}\right),(9)$$

, с - сигнал;where k is the DVAS number, $$k=\overline{\mathrm{one},m}$$

, s is the signal;

calculate in the n-th octave emission band for the j-th TCUI the total octave level of vibro-acoustic noise L _шnjΣ according to the formula:

$$L_{wnj}{}_{\Sigma }=101g\left(m_{nj}{10}^{\frac{L_{nj}}{10}}+{\displaystyle \sum _{i=\mathrm{one}}^{m_{nj}}{\displaystyle \sum _{k=\mathrm{one}}^{m_{nj}-\mathrm{one}}{\Delta }_{ik}{10}^{\frac{L_{njik}}{10}}}}\right),(10)$$

- поправка, характеризующая коэффициент корреляции внешнего шума на центральной частоте n-й октавной полосы излучения, поступающего с выходов k-го и i-го ДВАС, i - номер ДВАС, $$i=\overline{1,m_{nj}}$$

, i≠k, f - среднегеометрическая частота n-й октавной полосы излучения, Δf - ширина n-й октавной полосы излучения, τ_ik=0,75·10^-3 - оптимальный взаимный временной сдвиг смесей сигнала и шума, суммируемых с соседних ДВАС (обеспечивает максимальное количество ДВАС в пределах r_nj при соблюдении условия некогерентного сложения реализации шума в октавных полосах со среднегеометрическими частотами 1000, 2000, 4000 и 8000 Гц, содержащих около 85% всего формантного (смыслового) состава русской речи);Where $${\Delta }_{ik}=\exp (-\pi \Delta f^2{\tau }_{ik}^2)\left|\cos (2\pi f{\tau }_{ik})\right|$$

- amendment characterizing the correlation coefficient of external noise at the center frequency of the n-th octave band of radiation coming from the outputs of the k-th and i-th DVAS, i - the number of DVAS, $$i=\overline{\mathrm{one},m_{nj}}$$

, i ≠ k, f is the geometric mean frequency of the nth octave emission band, Δf is the width of the nth octave emission band, τ _ik = 0.75 · 10 ^-3 is the optimal mutual time shift of the signal and noise mixtures summed from neighboring DVAS (provides the maximum number of DVAS within r _nj subject to the conditions of incoherent addition of noise realization in octave bands with geometric mean frequencies of 1000, 2000, 4000 and 8000 Hz, containing about 85% of the entire formant (semantic) composition of Russian speech);

calculate in the n-th octave emission band for the j-th TCIM the signal-to-noise ratio by the formula:

$$E_n=L_{cnj\Sigma }-L_{wnj\Sigma };(\mathrm{eleven})$$

if r _nj <r _j , then the signal-to-noise ratio is calculated in the nth octave emission band for the j-th TCUI according to the formula:

$$E_n=L_{nj}-L_{wnj\Sigma };(12)$$

in the n-th octave band of radiation for the j-th TCI, the coefficient of perception of the BAC P _{n is} calculated by the formula:

$$P_n=\left|z-\frac{0,78+5,45\exp \left[-\mathrm{four},3\cdot {10}^{-3}{\left(27,3-\left|E_n-B_n\right|\right)}^2\right]}{\mathrm{one}+{10}^{0,\mathrm{one}\left|E_n-Bn\right|}}\right|,(13)$$

Where $$z=\{\begin{array}{c}0,e\mathrm{from}l\mathrm{and}{E}_n\le B_n;\\ \mathrm{one},e\mathrm{from}l\mathrm{and}{E}_n>B_n,\end{array}$$

B _n is the numerical value of the formant parameter of the BAC spectrum for the n-th octave frequency band, determined by standard data;

c) based on the values of P _n obtained for N octave bands, the maximum formant intelligibility A _{j of the} BAC signal is calculated for the j-th TCII according to the formula:

where A _nj is the numerical value of the weight coefficient of the n-th octave frequency band, determined by reference data;

из всех J ТКУИ к сумме значений максимальных формантных разборчивостей $${\displaystyle \sum _{j=1}^J{A}_j}$$

остальных j-х ТКУИ по формуле:g) calculate the ratio D of the maximum value of formant intelligibility $$\underset{j=\overline{\mathrm{one},J}}{\max }{A}_j$$

from all J TKUI to the sum of the values of the maximum formant intelligibility $${\displaystyle \sum _{j=\mathrm{one}}^J{A}_j}$$

other j-th TCUI according to the formula:

$$D=\frac{\underset{j=\overline{\mathrm{one},J}}{\max }{A}_j}{{\displaystyle \sum _{j=\mathrm{one}}^J{A}_j}};(\mathrm{fifteen})$$

calculate the Q value by the formula:

$$Q=0,39-0,2\underset{j=\overline{\mathrm{one},J}}{\max }{A}_j;(16)$$

compare D with Q:

и нормали к плоскости ТКУИ, имеющего наибольшее значение A_j из всех ТКУИ, лежащих в плоскостях, перпендикулярных ТКУИ с максимальным значением формантной разборчивости max $$\underset{j=\overline{1,J}}{\max }{A}_j$$

;if D≤Q, then IAS is placed at a height of 1.5 m from the floor of the room at the intersection of the normal to the TKUI plane with the maximum value of formant intelligibility $$\underset{j=\overline{\mathrm{one},J}}{\max }{A}_j$$

and the normals to the TKUI plane having the largest value A _j of all TKUI lying in the planes perpendicular to the TKUI with the maximum formant intelligibility max $$\underset{j=\overline{\mathrm{one},J}}{\max }{A}_j$$

;

;if D> Q, then IAS is placed at a height of 1.5 m from the floor of the room and at a distance of 1 m from TKUI with the maximum value of formant intelligibility $$\underset{j=\overline{\mathrm{one},J}}{\max }{A}_j$$

;

orient the working axis of the IAS emitter in the direction normal to the TKUI plane with the maximum value of the maximum formant intelligibility of the BAS max A _j .

2. Repeat the action taking into account the optimal placement of IAS according to paragraphs. b), c) p. 1.

3. Determine the integral value of verbal intelligibility of YOU in room W:

calculate the maximum value of the formant intelligibility of YOU in the room according to the formula:

$$A=\mathrm{one}-{\displaystyle \prod _{j=\mathrm{one}}^J(\mathrm{one}-A_j);(}17)$$

calculate the integral value of verbal intelligibility of YOU in room W according to the formula:

$$W=\{\begin{array}{l}\mathrm{one},54A^{0,25}\left[\mathrm{one}-\exp (-\mathrm{eleven}A)\right],PR\mathrm{and}A>0,\mathrm{fifteen};\\ \mathrm{one}-\exp \left(-\frac{\mathrm{eleven}A}{\mathrm{one}+0,7A}\right),PR\mathrm{and}A\ge 0,\mathrm{fifteen}\end{array}(\mathrm{eighteen})$$

and compare the result with the normative.

The set of essential features of the proposed method for monitoring the effectiveness of information protection exhibits new properties, which are as follows:

The developed procedures for determining the radius of the optimal DVAS placement zone, assessing the potential number of DVAS within a certain radius, and calculating the maximum formant speech intelligibility provide an increase in the reliability of assessing the security of each individual technical channel under the conditions of using a multi-channel receiving means that implements the correlation (secondary processing) speech signal, when use in the course of control of a typical single-channel measuring equipment;

the proposed procedure for determining the integral value of verbal intelligibility of speech, intercepted by the totality of the estimated technical channels, implemented by determining the coordinates of the optimal location point of the source of the test speech signal in the room, with further integration of the values of the maximum formant intelligibility of speech obtained by separate TKUI, with optimal placement of the source, is achieved accounting for the effect of complex (tertiary) processing of speech fragments intercepted in aggregate technical channels with different frequency characteristics.

, ориентации рабочей оси излучения ИАС по нормали к плоскости j-го ТКУИ и установке нормативных уровней излучения ИАС в n-х октавных полосах, где $$n=\overline{1,N}$$

, N - число октавных полос, установке ДВАС относительно j-го ТКУИ на рабочей оси излучения ИАС в первое положения - на нормативном удалении и во второе - на удалении 1-3 м от первого положения, и определении с помощью ДВАС уровней ВАС в n-х октавных полосах излучения для j-го ТКУИ в первом и втором положениях L_nj1 и L_nj2, где 1, 2 - первое и второе положения установки ДВАС, расчете для каждой из N октавных полос с использованием полученных значений уровней BAC L_nj1, L_nj2 радиуса оптимальной зоны размещения ДВАС для n-й октавной полосы излучения по j-му ТКУИ r_nj, расчете оптимального пространственного разноса соседних ДВАС для среды (материала) j-го ТКУИ r_j по формуле: r_j=0,75·10^-3 c_j, где c_j - скорость распространения акустического сигнала в среде j-го ТКУИ и сравнении его значения со значением радиуса оптимальной зоны размещения ДВАС для n-й октавной полосы излучения по j-му ТКУИ r_nj, определении при r_nj≥r_j максимального количества ДВАС, участвующих в суммировании ВАС в n-й октавной полосе излучения для j-го ТКУИ, расчете с использованием его значения суммарных октавных уровней виброакустических сигнала и шума в n-й октавной полосе излучения для j-го ТКУИ L_сnjΣ и L_шnjΣ, где ш, с - обозначение сигнала и шума и определении по разнице их значений октавного отношения сигнала к шуму в n-й октавной полосе излучения для j-го ТКУИ E_n, расчете при r_nj<r_j октавного отношения сигнала к шуму в n-й октавной полосе излучения для j-го ТКУИ E_n, вычитанием значения суммарного октавного уровня виброакустического шума L_шnjΣ из значения уровня ВАС, полученного при установке ДВАС в первом положении относительно j-го ТКУИ L_nj1, определении коэффициента восприятия ВАС в n-й октавной полосе излучения для j-го ТКУИ P_n и расчете с использованием его значений, полученных для N октавных полос, значения максимальной формантной разборчивости ВАС А для j-го ТКУИ, определении отношения максимального значения формантной разборчивости из всех J ТКУИ $$\underset{j=\overline{1,J}}{\max }{A}_j$$

к сумме значений максимальных формантных разборчивостей ВАС, полученных по остальным j-м ТКУИ D, вычислении 0,39-0,21 $$\left(\underset{j=\overline{1,J}}{\max }{A}_j\right)$$

и сравнении полученного значения со значением D, размещении при D≤0,39-0,2 $$\left(\underset{j=\overline{1,J}}{\max }{A}_j\right)$$

ИАС на высоте 1,5 м от пола помещения на пересечении нормали к плоскости ТКУИ с максимальным значением формантной разборчивости и нормали к плоскости ТКУИ, имеющего наибольшее значение максимальной формантной разборчивости ВАС из всех ТКУИ, лежащих в плоскостях, перпендикулярных ТКУИ с максимальным значением формантной разборчивости, размещении при D>0,39-0,2 $$\left(\underset{j=\overline{1,J}}{\max }{A}_j\right)$$

ИАС на нормативном удалении от ТКУИ с максимальным значением формантной разборчивости $$\underset{j=\overline{1,J}}{\max }{A}_j$$

, повторении процедур от установки относительно j-го ТКУИ ДВАС на рабочей оси излучения ИАС в два положения: на нормативном удалении и на удалении 1-3 м от него и до включительно определения максимальной формантной разборчивости ВАС A_j для j-го ТКУИ, определении максимального значения формантной разборчивости речи в помещении А при оптимальном размещении ИАС помещении, расчете с использованием значения которого интегрального значения словесной разборчивости ВАС в помещении W и сравнении его значения с нормативным значением W_н, где н - обозначение нормативного значения, делании по результату сравнения вывода об эффективности защиты информации.The proposed technical solution is new, because from publicly available information there is no known way to control the effectiveness of information protection based on determining the number J, location and type of TKUI, placing IAS at a standard distance from the j-th TKUI, where $$j=\overline{\mathrm{one},J}$$

, the orientation of the working axis of the radiation of IAS along the normal to the plane of the j-th TCI and setting the standard levels of radiation of IAS in the n-octave bands, where $$n=\overline{\mathrm{one},N}$$

, N - the number of octave bands, the installation of DVAS relative to the j-th TCI on the working axis of the IAS radiation in the first position - at a standard distance and in the second - at a distance of 1-3 m from the first position, and determining with the help of the DVAS the levels of YOU in n- x octave emission bands for the jth TCIS in the first and second positions L _nj1 and L _nj2 , where 1, 2 are the first and second positions of the DVAS setup, calculated for each of the N octave bands using the obtained BAC levels L _nj1 , L _nj2 Dvas radius optimal placement area for n-th octave band radiation of j-th TKUI r _nj, Calculating optimal separation distances for neighboring Dvas medium (material) j-th TKUI r _j using the formula: r _j = 0.75 · 10 ^-3 c _j, where c _j - propagation speed of the acoustic signal in the j-th medium and comparing it TKUI the values with the radius value of the optimal DVAS placement zone for the n-th octave emission band according to the j-th TKUI r _nj , determining, when r _nj ≥r _{j, the} maximum number of TWS participating in the summation of YOU in the n-th octave emission band for the j-th TKUI calculated using its value of the total octave levels of the vibroacoustic signal and noise in the n-th octave emission band for the j-th TCIMS L _сnjΣ and L _шnjΣ , where w, c - signal and noise designation and determination by the difference of their values of the octave signal-to-noise ratio in the n-th octave radiation band for the j-th TCUI E _n , calculated at r _nj <r _{j of the} octave signal-to-noise ratio in the n-th octave emission band for the j-th TCUI E _{n, by} subtracting the value of the total octave level of vibro-acoustic noise L _wnjΣ from the BAC level obtained when the DVAS was set to a first position with respect to j-th TKUI L _nj1, determining factor in the perception of BAC n-th ca. avnoy radiation band for the j-th TKUI P _n and calculating it using the values obtained for N octave bands, the maximum formant intelligibility for BAC A j-th TKUI, determining the ratio of the maximum value of all the formant intelligibility J TKUI $$\underset{j=\overline{\mathrm{one},J}}{\max }{A}_j$$

to the sum of the values of the maximum formant intelligibility of YOU obtained from the rest of the jth TKUI D, calculation of 0.39-0.21 $$\left(\underset{j=\overline{\mathrm{one},J}}{\max }{A}_j\right)$$

and comparing the obtained value with the value of D, placement at D≤0.39-0.2 $$\left(\underset{j=\overline{\mathrm{one},J}}{\max }{A}_j\right)$$

IAS at a height of 1.5 m from the floor of the room at the intersection of the normal to the TCUI plane with the maximum value of formant intelligibility and the normal to the plane of TCUI, which has the highest value of the maximum formant intelligibility of YOU from all TCUI lying in planes perpendicular to the TCUI with the maximum value of formant intelligibility, placement at D> 0.39-0.2 $$\left(\underset{j=\overline{\mathrm{one},J}}{\max }{A}_j\right)$$

IAS at the normative distance from TKUI with the maximum value of formant intelligibility $$\underset{j=\overline{\mathrm{one},J}}{\max }{A}_j$$

, repeating the procedures from the installation relative to the j-th TKUI DVAS on the working axis of the IAS radiation in two positions: at the normative distance and at a distance of 1-3 m from it to inclusively determining the maximum formant intelligibility of the BAS A _j for the j-th TKUI, determining the maximum values formant speech intelligibility in a room a for optimal placement IAS room calculation using values which integral values verbal intelligibility BAC indoor W and comparing its value with the standard value W _n where n - convoy Achen normative value, Delaney by comparing the output of the effectiveness of information security.

The proposed technical solution is practically applicable, since typical single-channel acoustoelectric measuring devices (microphone, vibration sensor, sound level meter with a set of band-pass octave filters) can be used for its implementation.

Claims (1)

A method for monitoring the effectiveness of information security, based on determining the number J, location and type of technical channels for information leakage, placing the acoustic signal source at a standard distance from the j-th technical channel for information leakage, where $$\overline{j=\mathrm{one},J}$$

orientation of the working axis of the radiation of the source of the acoustic signal normal to the plane of the j-th technical channel of information leakage and setting the standard level of radiation of the source of the acoustic signal in the n-octave bands, where $$\overline{n=\mathrm{one},N}$$

, N is the number of octave bands, characterized in that the vibroacoustic signal sensor is installed relative to the jth technical channel of information leakage on the working axis of the radiation of the acoustic signal source to the first position - at a standard distance and to the second - at a distance of 1-3 m from the first position and determine using the vibroacoustic signal sensor the levels of the vibroacoustic signal in the n-octave emission bands for the j-th technical channel of information leakage in the first and second positions L _nj1 and L _nj2 , where 1, 2 are the first and second floor After installing the vibroacoustic signal sensor, using the obtained values of the vibroacoustic signal levels L _nj1 and L _nj2 for each of the N octave bands, calculate the radius of the optimal placement zone of the vibroacoustic signal sensors r _nj (for the n-th octave emission band through the j-th technical channel of information leakage ), calculate the optimal spatial separation of adjacent sensors of the vibro-acoustic signal for the j-th technical channel of information leakage r _j according to the formula: r _j = 0.75 · 10 ^-3 c _j , where с _j is the propagation velocity a signal in the medium of the j-th technical channel of information leakage, and compare its value with the radius value of the optimal zone for the placement of vibration-acoustic signal sensors for the n-th octave emission band along the j-th technical channel of information leakage r _nj , if r _nj ≥r _j , then determine the maximum number of vibroacoustic signal sensors involved in the summation of the signal in the n-th octave emission band for the j-th technical channel of information leakage, and using the values of which calculate the total octave the levels of vibro-acoustic signal and noise in the n-th octave emission band for the j-th technical channel of information leakage L _сnjΣ and L _шnjΣ , where w, s are the signal and noise designations, and the octave signal-to-noise ratio in n- is determined by the difference in their values the octave emission band for the jth technical channel of information leakage E _n , if r _nj <r _j , then calculate the octave signal-to-noise ratio in the n-th octave emission band for the jth technical channel of information leakage E _{n by} subtracting the value of the total octave the level of vibro-acoustic noise L _wnjΣ from s the beginning of the level of the vibroacoustic signal obtained when the vibroacoustic signal sensor is installed in the first position relative to the jth technical channel of information leakage L _nj1 , the coefficient of perception of the vibroacoustic signal in the n-th octave emission band for the jth technical channel of information leakage P _{n is} determined, and using his values obtained for N octave bands calculated maximum formant intelligibility vibroacoustic signal A _j for the j-th channel leakage technical information determined otno ix maximum formant intelligibility of all J technical information leakage channels $$\underset{j=\overline{\mathrm{one},J}}{\max }{A}_j$$

to the sum of the values of the maximum formant intelligibility of the remaining j-th technical channels of information leakage D, calculate $$0,39-0,2\left(\underset{j=\overline{\mathrm{one},J}}{\max }{A}_j\right)$$

and comparing the obtained value with the value of the ratio of the maximum value of formant intelligibility from all J technical information leakage channels to the sum of the values of the maximum formant intelligibility of the remaining j-technical information leakage channels D, if $$D\le 0,39-0,2\left(\underset{j=\overline{\mathrm{one},J}}{\max }{A}_j\right)$$

then place the source of the acoustic signal at a height of 1.5 m from the floor of the room at the intersection of the normal to the plane of the technical channel of information leakage with the maximum value of formant intelligibility and the normal to the plane of the technical channel of information leakage having the highest value of the maximum formant intelligibility of the vibroacoustic signal from all technical channels information leakage lying in planes perpendicular to the technical channel of information leakage with the maximum value of formant intelligibility, ec whether $$D>0,39-0,2\left(\underset{j=\overline{\mathrm{one},J}}{\max }{A}_j\right)$$

then place the source of the acoustic signal at a standard distance from the technical channel for information leakage with the maximum value of formant intelligibility $$\underset{j=\overline{\mathrm{one},J}}{\max }{A}_j$$

, repeat the procedure from the installation relative to the j-th technical channel of information leakage of the sensor of the vibro-acoustic signal on the working axis of the radiation of the source of the acoustic signal in two positions: at the standard distance and at a distance of 1-3 m from it to inclusively determining the maximum formant intelligibility of the vibro-acoustic signal A for of the j-th technical channel of information leakage, determine the maximum value of the formant intelligibility of speech in room A with the optimal placement of IAS, using the value of which of the calculated integral value verbal signal intelligibility vibroacoustic indoor W and its value is compared with a standard value W _n, where n - the indication of the standard value, the result of the comparison concludes that the efficacy of protection.