RU7568U1 - CONFIDENTIAL COMMUNICATION DEVICE - Google Patents

Abstract

A confidential communication device containing a telephone installation, security equipment, the first input of which is connected to the second output of the first switch, and the first output to the second input of the second switch, characterized in that a matching unit, a transition unit, a signal analysis unit, a position analyzer are introduced tubes, the third and fourth switches and the OR element, while the adapter unit on the channel side is connected to the communication channel, and on the subscriber side, the input through the third switch is connected to the first output of the first switch, the output with the first input of the signal analysis unit and through the fourth switch with the first input of the second switch, the first output of the signal analysis unit through an OR element is connected to the first control inputs of the first, second, third and fourth switches, the second output is connected to the second control inputs of the third and fourth switches and to the additional input of the security equipment, the second output of which is connected to the second input of the third switch, the second input to the second output ohm of the fourth switch, the first additional output with the second control inputs of the first and second switches, the second input of the signal analysis unit is connected to the additional input of the adapter unit and connected to the second output of the tube position analyzer, the third output of which is connected to the second input of the OR element, the input to the telephone installation, and the first output to the first input of the matching unit, the first output of which is connected to the input of the first switch, the second output to the input of the telephone installation, the second input

Description

COMMUNICATION DEVICE

The utility model relates to communication technology and can be used in the development of equipment for the confidential transmission of telephone information over telephone networks.

Known devices for classifying discrete information,

which work only on fixed communication channels and do not provide information transfer over switched networks fj

The specified drawback is deprived of the confidential communication device according to the application 96107523/20 of 18.04 L99bchch, according to which VNIIGPE made a positive decision. This device is selected as prototype 2.

The device contains a telephone installation, the output through the first switch connected to the first input of the equipment of security, and the input. through the second switch - with the first output of the security equipment The second output of the security equipment is connected to the second output of the first switch and connected to the input of the communication channel. The second input of the security equipment is connected to the second input of the second switch and connected to the output of the communication channel. The main output of the power supply is connected to the power inputs of both switches and security equipment, and the additional output is connected to the first control inputs of the switches and through the switching element to the second control inputs of these switches.

Security equipment consists of a transmitting and receiving part. The transmitting part contains a serially connected transmitting speech-converting device (RPU), an encoder and a transmitting signal conversion device (OOPS). The reception

MPKb N04 KS / 00

part contains serially connected receiving UPS, decoder and receiving RPU.

The known device operates as follows. When the handset is picked up, the power supply is turned on, while power is supplied to the device units and the voice circuits are connected to the subscriber trunk line, bypassing the privacy equipment. The subscriber in the traditional way adopted for the PBX, establishes a connection with the called subscriber by dialing. After official negotiations, both subscribers should press the button, as a result of which the conversational circuits are connected to the secret equipment and it becomes possible to transmit information that is classified, after which it is transmitted to the telephone network and through the channel of communication to the secret equipment of another subscriber, where it is declassified and issued to the subscriber .

A disadvantage of the known device is the low security of communication, since it is possible to transmit secret information without securing it in the case when, after establishing a connection, the subscribers do not press a button and proceed to secret negotiations.

Since, when the button is not pressed, the telephone set is connected to the communication channel, bypassing the secret equipment, the secret information of the budgets is transmitted unclassified and, as a result, becomes available for interception by third parties.

The objective of the proposed utility model is to increase the security of the network.

The technical result achieved by the proposed technical solution is to automatically connect the conversational circuits of the telephone installation to the security equipment after the connection is established, thereby eliminating the possibility of transmitting classified information bypassing the security equipment, V i.e. in open form. The specified technical result is achieved in the implementation of the proposed utility model by the fact that in the known confidential communication device containing a telephone installation, security equipment, the first input of which is connected to the second output of the first switch, and the first output to the second input of the second switch, a matching unit, transition unit, signal analysis unit, tube position analyzer, third and fourth switches and a ShI element, while the transitional unit from the channel side is connected to the channel check, and on the subscriber side, the input through the third switch is connected to the first output of the first switch, the output to the first input of the signal analysis unit and through the fourth switch to the first input of the second switch, the first output of the signal analysis unit through the OR element is connected to the first control inputs of the first , the second, third and fourth switches, the second output to the second control inputs of the third and fourth switches and to the auxiliary input of the securing device, the second output of which is inen with the second input of the third switch, the second input with the second output of the fourth switch, the first additional output with the second control inputs of the first and second switches, the second input of the signal analysis unit is connected to the additional input of the transition unit and connected to the second output of the tube position analyzer, the third the output of which is connected to the second input of the SI element, the input to the output of the telephone installation, and the first output to the first input of the matching unit, the first output of which is connected to the input of the first of the second switch, the second output - with the input of the telephone installation, the second exit - with the input of the second switch.

In the proposed device, using the analyzer of the position of the tube and the signal analysis unit, the moments of establishment and destruction of the connection are automatically determined. In this case, the signal corresponding to the moment of establishing the connection, the equipment of classification is connected to the conversation path, and the signal corresponding to the end of the connection is disconnected from it.

In the study of the distinguishing features of the proposed device is not revealed any similar solutions regarding the use of known analyzers for these purposes. In addition, the analysis of the prior art by patent and scientific and technical sources of information made it possible to establish that no analogue has been found, characterized by features similar to all the essential features of the claimed technical solution. A comparative analysis of the prototype allowed us to identify a set of essential distinguishing features in the claimed device, set forth in the utility model formula. Therefore, the claimed utility model meets the condition of novelty. Figure 1 presents the functional diagram of the proposed device,

figure 2 is a timing diagram of the operation of the device, on fiGSZ - functional diagram of the equipment of classification, figure 4 is an example of a connection diagram of a telephone installation to the analyzer of the position of the tube and the matching unit,

figure 5 is an example implementation of a tube position analyzer, figure 6 is an example implementation of a signal analysis block, figure 7 is an example implementation of a transition block, figure 8 is an example implementation of a transmitting RPU; Fig.9 is an example implementation of a receiving RPU, v in Fig. 10 is an example implementation of a cshfrator} in Fig. II is an example implementation of a decoder, and Fig. 12 is an example implementation of a digital signal analyzer. The confidential communication device comprises a telephone set I, security equipment 2, a tube position analyzer 3, a matching unit 4, a signal analysis unit 5, a transition unit b, a first 7, a second 8, a third 9, a fourth 10 switches, an OR element II, a communication channel 12 The output of telephone installation I through a series-connected analyzer of the position of the tube 3, matching 4 block, first 7 switch, third 9 switch, transitional 6 block connected to the communication channel 12. The output of transitional b block is connected to the first input of the analysis block 5 s signals through the fourth 1C and second 8 switches connected in series to the second input of the matching 4 units, the second output connected to the input of the telephone installation I. The first output of the 5 signal analysis unit through an OR element II is connected to the first control inputs of the first 7, 8, 3 9 and the fourth 10 switches, the second output - to the second control inputs of the third 9 and fourth 10 switches and to the additional input of the security equipment 2, the second output of which is connected to the second input of the third 9 switch ator, the second input - to the second output of the fourth switch 10, the first additional output - with second control inputs of the first 7 and second 8 switches. The second input of the signal analysis block 5 is connected to an additional input of the transitional 6 block and is connected to the second output of the tube position analyzer 3, the third output of which is connected to the second input of the OR element II.

In the proposed device, the power supply is not controlled (switched), unlike the prototype, but is constantly connected to the nodes of the device. In this regard, in Fig. 1 it is not shown, although the presence of it, as well as other permanently connected devices, for example, a clock frequency block, goes without saying. The operation of the proposed device is illustrated by the time diagram presented in figure 2. In the initial state, when the handset is placed on the telephone set lever I, the switches 7-10 are in the position in which the first output and the second input of the matching 4 unit are connected respectively to the subscriber input and the output of the transitional unit b. When the caller picks up the handset from the telephone, the contacts of its lever switch are closed, while analyzer 3 detects the fact of picking up the handset (moment AI in Fig. 2a) and generates a signal on the third output, which confirms the state of the switches through the OR element II.

In addition, the analyzer 3 on the second output gives a signal to the auxiliary input of the transitional b block, while the latter closes the trunk, the PBX, having detected the status of the trunk of the trunk, issues a Ready signal: a tone frequency signal of 425 Hz, which is through the transition b block, the fourth 10 and the second 8 switches, the matching 4 unit enters the telephone installation I, prompting the subscriber to dial the number of the called subscriber. After dialing the first digit of the number, the Ready signal is removed (Fig. 2 c, d), after dialing the last digit of the number (Fig. 2 d, c), the called signal is sent to the called subscriber e © PBX, and the call is sent to the calling subscriber.

(figure 2 g). Signal A call from communication channel 12 through a transitional V to the telephone set I of the called subscriber, in which an alarm is triggered; for example, a bell rings (buzzer). At the same time, the Call signal arrives at the first input of the 5 signal analysis block, where it is stored. When the called subscriber picks up the handset, the analyzer 3 of the position of the handset on the second output gives a signal that is fed to the second input of the 5 signal analysis unit, while the last on the second output gives a signal (Fig.2g, momenta A2) to the first inputs of the third 9 and fourth 10 switches and to the additional input of the security equipment 2. In this case, the adapter 6 is connected to the security equipment 2. The PBX, having detected the status of the trunk line after the called party picks up the phone, switches the path between the subscribers (figure 2 e). The signal received at the additional input of the security equipment 2 sets it into synchronization mode and is issued by the first additional output, setting the first 7 and second 8 switches to a state in which the conversational circuits of telephone installation I are connected to the security equipment 2 In sync mode, transmitting part of the latter gives out the synchro-packet on the second output (Fig.2i), which through the third switch 9 and the transitional b block enters the communication channel 12, and the receiving part is set to receive mode Sishpopoyoilki. on the calling side, the clock from the communication channel 12 through the transitional 6 block enters the signal analysis block 5, which extracts from it the signs of a digital signal (as opposed to a tone signal), for example, bi-pulse (Fig. 2i). Based on the combination of the digital signal and the signal from lifting the handset, the 5-signal analysis unit, as well as on the called stron, outputs a signal to the first control inputs of the third 9 and fourth-to-10 switches 10 on the second output, while the 12 v communication channel is connected to security equipment 2. In addition to In addition, the signal e0 of the second output of the analysis unit 5 is fed to an additional input of this equipment, which is set to synchronization mode, while the clock is transmitted to the called party, and the receiving part of the equipment performs it sinhroposylki in hand to call. At the time of synchronization of the security equipment 2, the last one on the first output through the second b switch gives the Schzite signal to the phones of both subscribers (Fig.2k), which can be either signals of increased tonal frequency, or some melody, or some phrase. In the case of receiving sync packages, that is, entering synchronism, the secreting equipment removes the Wait signal (Fig.2l), which is an invitation to negotiate (Fig.2m). If the sync is not accepted for a predetermined time, the privacy equipment itself is set to resynchronization mode. This process will continue until the privacy equipment on both sides is synchronized or until the caller hangs up on the telephone set lever. After the call ends, one of the subscribers hangs up (Fig.2n), while the position analyzer of tube 3 is in the third the output signal is laid out and through the MI II element sets the switches 7-10 to a state in which the conversational circuits of the telephone installation are disconnected from the privacy equipment and connected to the communication channel. Since, when the handset is laid, the cable of the connecting line breaks (Fig.2o), the PBX, having discovered this fact, generates an Ofboy signal towards the opposite party (Fig. ZD, which enters the unit

analysis of 5 signals, also connecting the telephone set to the communication channel, bypassing the security equipment, while the End call goes to the subscriber’s telephone (Fig.% 0. Upon hearing this signal, the subscriber hangs up (Fig. 2c), and the trunk line is broken, and The PBX, having discovered this, breaks the connection (Fig. 3T).

For a better understanding of the essence of the proposed technical solution, Fig. 3 shows a functional diagram of the security equipment (implementation example), in which an encoder and a decoder with forced synchronization are used.

The security equipment contains an IDI element 2-1 in series connected transmitting 2-2 RPU, encoder 2-3 and transmitting 2-4 UPS, sequentially connected receiving 2-5 UPS, decoder 2-6 and receiving RPU. In this case, the first and second inputs of the secret equipment are inputs of a transmitting 2-2 RPU and a receiving 2-5 UPS respectively. The first and second outputs of the security equipment are outputs respectively of the receiving 2-7 EPU and transmitting 2-4 UPS. The additional input of the security equipment through the OR 2-1 element is connected to the synchronizing inputs of the receiving 2-7 RPU, the decoder 2-6, the encoder 2-3 and the first additional output of the security equipment. The second and third inputs of the OR 2-1 element are connected respectively to the low-low output of the receiving 2-7 RPU and the first additional output of the decoder 2-6, the second additional output of which is connected to the enabling input of the receiving 2-7 RPU.

Secret equipment operates as follows. The signal received at the additional input of the equipment through OR 2-1 sets the encoder 2-3 to the sync transmission mode

receiving RPU 2-7 in the prohibition mode of issuing an additional output of the encoder ray synchronization signal for an additional output. After entering synchronism (the main processor), the decoder 2-6 at the second additional output gives a signal allowing the operation of the receiving 2-7 RPU. After the transmitting and receiving encoders (decoders) enter synchronism, it becomes possible to transmit and receive information. The information received at the first input of the security equipment in the transmitting 2-2 RPU is converted from analog to digital form, for example, by PCM conversion or deltasion modulation. In the encoder 2-3, the information is classified and, through the transmitting device 2-6, the signal conversion device enters the second output of the classification equipment.

The received information received at the second input of the secreting equipment is fed into the receiving room 2-5 of the UPS, in which the digital signals are demodulated and regenerated, for example, by adjusting the local clock frequency to the middle of the received packets and testing them in the least distorted zone. The recovered information from the output of the receiving 2-5 UPS goes to the decoder 2-6, where it is declassified, after which it goes to the receiving 2-7 of the RPU, where it is converted into analog form and issued on the first output of the security equipment.

In the event that the decoder 2-6 did not receive the clock at a predetermined time, after a while it gives a signal on the first additional output, which through the IDN 2-1 element repeatedly performs the synchronization process of the privacy equipment.

In the case of re-synchronization of the secret equipment during operation, the receiving 2-7 RPU detects this fact and, by means of the positive output, gives a signal that also repeats the synchronization procedure through the IEI 2-X element.

Figure 4 presents an example of a connection diagram of the telephone installation I 3 to the analyzer of the position of the tube 3 and matching 4 unit.

Telephone installation I contains a telephone set 1-X matching transformers 1-2 and 1-3. The matching unit 4 contains a power source 4-1, matching transformers 4-2 and 4-3.

Transformers 1-2 and 4-2 are designed to connect the microphone circuit of the 1-X telephone to the transmitting part of the secret equipment or bypassing it through switch 7.

Transformers 1-3 and 4-3 are designed to connect the telephone circuit of the telephone set XX to the receiving part of the secret equipment or bypassing it (via switch 8)

The power supply of the 1-X telephone device is carried out via a phantom circuit of transformers from a 4-X power source.

When you pick up the handset of the telephone in the microphone circuit, current flows, as a result of which the position analyzer of the handset 3 works, giving the corresponding signals.

Figure 5 presents an example implementation of the analyzer of the position of the tube 3 (circuit diagram). The analyzer is included in the transmitting pair of the four-wire telephone and contains the following nodes:

measuring element 3-1 (resistor Rj included in the microphone circuit of the telephone)

Schmidt trigger 3-4,

items OR 3-5, 3-6,

key 3-7 j

triggers 3-8, and 3-9,

adder 3-10 modulo two.

The inputs and outputs of the comparator 3-2 are, respectively, the first input and the analyzer shchhod. The output of the element SHI 3-6 is the second output, and the adder 3-10 modulo two the third output of the analyzer. The analyzer is built according to the circuit of a voltage comparator with a response threshold selected using a variable resistor RJ. Until the subscriber picks up the tube, the voltage across the RE resistor is 0. The integrator capacitor C 3-3 will be in a charged state. Logical O will be present at the second output of the analyzer. Elements 2-8, 3-9 to 3-10 form the analyzer of the presence of a photocell and a signal at its output, that is, at the third output of the analyzer of the tube position, only at the end of the polarity change at the output of the SHI 3- element 6. When you remove the tube, a current flows through the microphone circuit and a voltage drop appears on the resistor Ra. This leads to the switching of the comparator and the creation of the discharge circuit of the capacitor C through the resistor R and the open output stage of the comparator. The time constant of the C-R circuit is selected in such a way as to prevent the occurrence of false pulse signals as a result of de-bounce of the contacts of the telephone switch lever.

With the discharge of the capacitor C to a voltage corresponding to the threshold of the Schmidt trigger 3-4, a potential appears at the second output of the analyzer, and an pulsed pulse appears at the third output of the analyzer, which corresponds to the front of this potential. These signals are used to switch circuits of the telephone set, the Integrator, as well as nodes 3-4, 3-5, and 3-6 and the resistor RQ provide the analyzer to output signals without interruptions during the occurrence of contact bounce of the lever switch. When laying the tube, the potential at the output of the OR 3-6 element will disappear, but the front analyzer will again select the pulse, which will be outputted at the third output of the tube position analyzer 3. Figure 6 shows an example implementation of the signal analysis block 5. Block 5 signal analysis contains: signal analyzer End 5-1, signal analyzer it Call 5-2, analyzer digital 5-3 signal, IDI element 5-4, first 5-5 and second triggers, delay element 5-7, element And 5-8. The output of the signal analyzer End 5-1 is the first output of the signal analysis unit, the output of the delay element 5-7 is the second output of the signal analysis unit. The inputs of the analyzers 5-1, 5-2, 5-3 are the first input, and the input of the trigger 5-6 is the second input of the signal analysis unit. Block 5 signal analysis works as follows. The signal The tube is removed, generated by the analyzer of the position of the tube 3, (figL) is fed to the second input of the signal analysis block 5 (figure 4), setting the trigger 5-6 to a state in which the And 5-8 element opens. The signal from the canopy channel is fed to the first input of the signal analysis unit 5 and from the receiver to the inputs of the analyzers 5-1, 5-2, 5-3. Signal analyzers OvboY 5-1 and Challenge 5-2, “can be implemented, for example, sh.ev. N 1355368, M.C. HC No. Q U04

and a.s. No. I2464I7, M.C. H04Q 1 / yb. If there is a signal in the linear signal, the Analyzer 5-1 is triggered, which gives it to the first output. If there is a call signal, the analyzer 5-2 is triggered, the signal from the output of which through the SHI element 5-4 sets the trigger 5-5 to a single state, while the And 5-8 element is triggered, the signal from the output of which through the delay element 5-7 resets the triggers5 -5 and 5-6 and goes to the second output of the signal analysis block. In the presence of a digital signal, the analyzer 5-3 is triggered (for an implementation example, see Fig. 12), the output signal of which passes along the same circuit as the Call signal.

Figure 7 presents an example implementation of the transition block b.

The adapter block is designed to organize the transition from a four-wire system to a two-wire system and to organize a loop on a telephone exchange.

The adapter block e © holds: differential system 6-1, key 6-2, throttle bZ.

The differential system provides a transition from a four-wire system to a two-wire system.

When lifting the tube, the analyzer of the position of the tube 3 gives a signal that closes the key 6-2, while creating a loop of the DC connecting line.

The b-3 choke has a high resistance to alternating current, which eliminates the bypass of both PBX signals and conversational signals.

When placing the telephony® multimedia handset, the signal arriving at key 6-2 is removed and the cable is broken.

On Fig presents an example implementation of a transmitting 2-2 RPU. It contains:

analog-digital converter 2-2-1,

voice transmitter 2-2-2,

memory device (memory) 2-2-3,

IDI element 2-2-4,

distributor 2-2-5

inverter 2-2-6,

sync sensor 2-2-7)

elements And 2-2-8, 2-2-9.

In the proposed confidential device, a periodic transmission of a synchronizing combination is used to control the synchronous operation of the transmitter side encoder and the receiver side decoder. Allocation of it on the receiving side is a sign of synchronous operation, and non-allocation is a sign of desync of the encoder and decoder. The synchronizing combination is generated by the sync sensor 2-2-7 and is periodically included in the speech signal.

The operation of the transmitting RPU is as follows. The analogue speech signal input to the RPU is converted by a digital-to-analog converter into digital form.

The transmitting 2-2-2 speech signal converter forms the necessary structure of the speech signal, which with a clock frequency f- | recorded in memory 2-2-3. Reading from the memory 2-2-3 occurs with a higher frequency -f, which is controlled by the distributor 2-2-5. The excess of the frequency Ja over the frequency is determined by the duration and frequency of transmission of the synchronizing combination. While reading

of information from the memory 2-2-3, the distributor 2-2-5 gives a signal, the opening element And 2-2-9 and the read frequency {% passes to the reading input of the memory 2-2-3 and information from it through the element OR 2-2 -4 goes to the output of the transmitting 2-2 RPU.

Nodes 2-2-1 and 2-2-5 can be implemented, for example, by A.S. I08806I, M.C., GOL 1/06. In the particular case when self-synchronizing devices l are used as encoders and decoders, the transmitting RPU may contain only 2-2-1 nodes, or even one delta codec.

Figure 9 presents an example implementation of the receiving 2-7 RPU.

The reception room 2-7 RPU contains:

counter 2-7-1,

sycrocombination analyzer 2-7-2,

distributor 2-7-3}

digital to analog converter

switch 2-7-5,

speech transducer

storage device 2-7-7,

Signal Sensor Shield 2-7-8,

trigger 2-7-9,

elements And 2-7-10 and 2-7-II.

The input of the And 2-7-II element and the 2-7-2 synchro-combination analyzer is the input, and the output of the digital-to-analog converter is 2-7-4 by the output @ p® RPU. The first input of the trigger 2-7-9 and the first control input of the switch 2-7-5 is the synchronizing input of the PRFMIOG® 2-7 RPU. The second input of trigger 2-7-9 is the enable input, and the output of the counter 2-7-1 is an additional output of the receiving 2-7 RPU.

When a signal arrives at the synchronizing input, the switch 2-7-5 is set to the position at which the signal sensor Wait 2-7-8 through the digital-to-analog converter 2-7-I and connect to the RPU output. In this case, to the subscriber’s telephone. a signal arrives, signaling that the process of synchronization of the encoders is in progress. The signal received at the synchronizing input of the RPU trigger 2-7-9 is set to position W, while the element And 2-7-II is closed and the clock frequency / does not go to the analyzer 2-7-2 and the counter 2-7-1, thereby preventing the isolation of the encoder desync signal, since the last ones are already in the process of synchronization. After the synchronization of the encoders, a signal is received at the enable input of the RPU, which sets the trigger 2-7-9 to state I, when the operation of the sync analyzer 2-7-2 and the counter 2-7-1 are allowed.

The information received at the input of the RPU in the analyzer 2-7-2 is analyzed for the presence of synchronization. With the synchronous operation of encoders and decoders of opposite stations, the analyzer regularly identifies synchronization, while the counter 2-7-1 is regularly cleared. In case of unsynchronous operation (failure), the synchronization will not be allocated and the counter 2-7-1, after a certain number of clock cycles, will output a signal to the encoder synchronization process via an additional output.

A signal corresponding to the time of synchronization allocation is synchronized with a 2-7-3 distributor, which, at the time of reception, by using the And 2-7-1I element prohibits its recording in memory 2-7-7. In a taxi way, during synchronous operation in the memory, only the channel clock frequency j is recorded

information and integration into the telephones of the subscriber does not pass. Reading information from ZU2-7-7 occurs with a clock frequency f j less than j. Information from the memory 2-7-7 enters the receiving 2-7-6 speech signal converter,

from it through the switch 2-7-5, set to the appropriate state by the signal of the end of synchronization of the encoders, received at the enable input of the RPU, through the digital-to-analog converter 2-7-4 - to the input of the RPU.

The digital-analogue converter 2-7-4 and the receiving 2-7-6 speech signal converter carry out conversions that are opposite to the transformations on the transmitting side and can be implemented according to .U 108806I, M.cl. GiOl {/ () Ј as mentioned in the description of the transmitter 2-2. RPU.

In the case, if devices are used as transmitting and receiving speech converters, where the information is transmitted in frames (cycles), for example, by a.s. No. 1490689 M.C. G-iOL 7/06 for the purposes of frame (cycle) synchronization, a signal emitted by the sync combination analyzer 2-7-2 can be used. If a delta-cell is used as a speech transducer, then there is no need for a cyclic synchronization signal.

The signal sensor Cdite can be made, for example, in the form of a permanent memory, in which such a combination is recorded that, after conversion in the digital-to-analog converter 2-7-4, turns into the corresponding tone signal or musical phrase.

Figure 10 presents an example implementation of the encoder 2-9.

The encoder contains: X recurrent shift register 2-3-5, switch 2-3-6, switch 2-3-7, statistics equalization block 2-3-8, adder modulo two. The input of the second 2-3-3 time sensor is the synchronizing input of the encoder, the output of the switch 2-3-6 is the output of the encoder, and the first input of the adder 2-3-9 modulo two is the input of the encoder. The encoder works as follows. When the power is turned on or by a signal from the outside, the first 2-3-3 time sensor gives a pulse on the first output, which sets the recurrent shift register 2-3-5 to the zero state, and on the second output for a certain time ducks a signal that opens the And 2 element -3-4. In this case, the random sequence O and Iy generated by the noise generator 2-3-1 is recorded in the recursive regivre “moving 2-3-5. After filling this register, the first 2-3-2 time sensor removes the signal from the second output. Beginning at this point, the recursive shift register operates autonomously, producing the recurrence sequence used to form the encryption sequence. For this, the signs of the recurrence sequence with each encryption cycle through the 2-3-7 switch are counted in the 2-3-8 statistics equalization block. The structure of the 2-3-7 switch is known only to the transmitting and receiving subscribers and is unknown to unauthorized persons. The privacy of the transmission of information is based on the echo condition. This structure is determined by a secret key and can be set, for example, by manually switching the inputs and outputs of the switch. The leveling tree of statistics 2-3-8 makes the sequence arriving at the rh © inputs close to random, with the probability of occurrence of O and I at its output equal to 0.5 and can be implemented, zapshher, pairwise addition of binary characters on eg inputs by module two. The encryption sequence formed in this way is fed to the input of the adder 2-3-9 modulo two, where it is added to the information received at the other input of the adder. Secret information through the 2-3-6 switch is required for the output of the encoder. If it is necessary to synchronize the encoder of the transmitting station and the decoder of the receiving station, a signal is received at the synchronizing input of the encoder, it starts the 2-3-3 time sensor and sets the 2-3-6 switch to the position at which the output of the adder 2-3- 9 is turned off, and the output of the recursive shift register 2-3-5 is connected to the output of the encoder. At the same time, over a certain period of time, formed by a 2-3-3 time sensor, a recursive sequence arrives at the output of the encoder Yud, used to synchronize the decoder of the opposite station. After this period of time, the sensor 2-3-3 gives a signal to the second input of the switch 2-3-6, while the output of the adder 2-3-9 is connected to the output of the encoder. In FIG. II shows the implementation of the decoder 2-6. The decoder "will hold: a counter 2-6-1 of the number of zeros, a unit for checking for errors 2-6-2, an element 2-6-3, a trigger 2-6-4, a key block 2-6-5,

recursive shift register 2-6-6,

delay element 2-6-7,

switchboard

time counter 2-6-9,

statistics equalization block 2-6-10,

adder & -6-II modulo two.

The input of the recurrence test block 2-6-2 and the first input of the adder 2-6-P modulo two are the input of the decoder, the first input of the trigger 2-6-4 and the first input of the time counter 2-6-9 are the synchronizing input of the decoder, the output the adder 2-6-1I is the output of the decoder, the output of the delay element 2-6-7 l the output of the time counter 2-6-9 are respectively the first and second additional outputs of the decoder.

The decoder works as follows.

When a signal is received at the synchronizing input, a time counter is started, which counts the time after which re-synchronization should be carried out, and also trigger 2-6-4 is set to state 1, opening the And 2-6-3 element. The information coming from the communication channel to the input of the doorway | p © p «, by the verification unit 2-6-2, is analyzed for compliance with the recurrence law. When selecting a certain number of e-branches (zeros) in a row, the counter of the number of zeros 2-6-1 generates a signal that, through the open element And 2-6-3, enters the control input of the key block 2-6-5, opening them, with this cm check block (recurrence sequence received from the communication channel) is counted in the recurrence shift register 2-6-6, similar to the recurrence register 2-3-5 (10) of the transmitting encoder. v From the shift register 2-6-6, the contents through the switch 2-6-8, similar to the switch 2-3-3 of the iterator (Fig. 10), are transferred to the equalization block of statistics 2-6-10, similar to the transmitting one. At the output of the & -6-IO block, an encryption sequence similar to the transmitting one is formed. On the adder 2-6-1I modulo two there is a declassification of the information that goes to the decoder output. After the recursion sequence is recorded in the registers 2-6-6 from the output of the delay element 2-6-7, the trigger 2-6-4, the time counter 2-6-9 are reset, and the signal about the end of synchronization is output on the first two-way output. In the event that during a certain time counted out by the ет er 2-6–9) the recurrence sequence will not be selected, the éthet will give a signal at the second additional output of the decoder for re-synchronization. Fig. 12 shows an example implementation of a digital 5-3 signal analyzer, which can be a bi-pulse signal. This signal is characterized by the presence of bursts of duration either one clock interval (when transmitting only logical 1) 7 or half the clock interval (when transmitting only logical O). Thus, the number of sending edges per unit time cannot be less than one certain value and more than another value. In a classified signal, the probability of occurrence of O and I is close to 0.5, therefore, the real value of the number of fronts lies in the interval between the minimum and maximum values. The analyzer proposed below captures the number of fronts that fall into a certain zone. In this case, the probability of a false bi-pulse signal separation from the J and Call tone signals is insignificant, since the number of edges in the indicated signals differs from the number of edges in the bi-pulse signal when the work speed in the communication channel is more than 2400 bit / s. The bi-pulse signal analyzer contains: a 5-3-1 time interval sensor, a 5-3-2 edge presence analyzer, a 5-3-3 edge counter, 5-3-4 and 5-3-5 decoders, an I 5-3- element 6, trigger 5-3-7, element OR 5-3-8. The bi-pulse signal arrives at the analyzer 5-3-2, which extracts the f $ @ nts of the packages, counted by the counter 5-3-3 for a certain interval, generated by the sensor of the time interval 5-3-1. The decoders 5-3-4 and 5-3-5 determine the zone in which the number of fronts should be. When in this zone, the decoder is activated and sets trigger 5-3-7 to state I. When leaving this zone, the decoder 5-3-5 is triggered, which, through the OR 5-3-8 element, resets trigger 5-3-7. At the end of the time interval ©, the I-5-3-6 circuit is interrogated, from the output of which a signal is issued indicating the presence of a digital signal. By the same polling signal “counter 5-3-3, trigger 5-3-7 are set to a non-working state. In the proposed device, the telephone set has a 4-wire output (two wires for the microphone circuit and two wires for the telefen @ circuit) in connection with this, switches 7-10 must switch w 2 targets each, for these purposes it is convenient

use a polarized relay RPS 45, which has several contact groups. However, the possibility of making switches on analog keys, as proposed in the prototype, is not ruled out.

Thus, the materials discussed above allow us to conclude both about the feasibility of the practical implementation of the proposed technical solution ® ak and about the attainability of the technical result, which consists in automatically connecting the conversational circuits of the telephone to the security equipment after establishing a connection and synchronizing this equipment, which eliminates the possibility of secret transmission information bypassing security equipment, that is, increases communication security.

BIEJUGRAFICHSKY DATA

1.W. Diffie, M.E. Hellman. Security and imitation about resistance. Introduction to cryptography, TIIER-1979-I 3. - P.90.91.95-97.

2. The device of confidential communication. Application for utility model No. 96107523/20 of 18.041996.

3. Telecommunication device AGAWA RGO 218.069 TU AO OT NII SRI subscriber "telephone equipment association TE3ITA, Perm.

Claims (1)

A confidential communication device containing a telephone installation, security equipment, the first input of which is connected to the second output of the first switch, and the first output to the second input of the second switch, characterized in that a matching unit, a transition unit, a signal analysis unit, a position analyzer are introduced tubes, the third and fourth switches and the OR element, while the adapter unit on the channel side is connected to the communication channel, and on the subscriber side, the input through the third switch is connected to the first output of the first switch, the output with the first input of the signal analysis unit and through the fourth switch with the first input of the second switch, the first output of the signal analysis unit through an OR element is connected to the first control inputs of the first, second, third and fourth switches, the second output is connected to the second control inputs of the third and fourth switches and to the additional input of the security equipment, the second output of which is connected to the second input of the third switch, the second input to the second output ohm of the fourth switch, the first additional output with the second control inputs of the first and second switches, the second input of the signal analysis unit is connected to the additional input of the adapter unit and connected to the second output of the tube position analyzer, the third output of which is connected to the second input of the OR element, the input to the telephone installation, and the first output to the first input of the matching unit, the first output of which is connected to the input of the first switch, the second output to the input of the telephone installation, the second input d - with the output of the second switch.