RU2790351C1 - Memory chip emergency destroyer - Google Patents

Abstract

FIELD: technical means for protecting confidential information against unauthorized access.

SUBSTANCE: invention relates to technical means for protecting confidential information against unauthorized access. Device contains a sealed casing, in which the working charge consisting of a metal tube filled with pyrotechnic composition with a weakening slot on the outer surface and an initiating element consisting of current-carrying electrodes with a glow bridge, are installed. The design includes an electronic unit, through which the data carrier is connected to the device via a multi-core loop. The unit includes a capacitive energy storage unit with a charge control unit, activation control units, glow bridge integrity control and control signal passage. The capacitive accumulator is connected to the glow bridge via MOS-switches transistor switches with a diode connected in parallel in reverse. Transistors installed in the circuit of the engagement control unit are cascaded to the transistor MOS-switches gates, and two separate transistor switches installed in the circuit of the charge control unit are connected in parallel to the capacitive storage device via a resistor. Two limiting resistors and transistor switches are connected in series to the glow bridge, and two separate transistor switches installed in the glow bridge integrity control and control signal passage circuitry for connection to the test current source provided with the data carrier.

EFFECT: invention provides possibility to increase a device actuation reliability and a personnel safety during the device operation.

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Description

The invention relates to the field of technical means for protecting confidential information from unauthorized access, namely to devices for destroying memory chips containing protected information to a state that makes it impossible to recover.

When developing devices for the destruction of integrated circuits (microcircuits) of memory (information carriers), in particular, they are required to be compact and embeddable in devices using them. The task in the considered field of technology and to which the claimed invention is directed is the creation of a device for the emergency destruction of memory chips that is reliable and safe for personnel during its operation.

In the prior art, there are many ways to physically destroy microcircuits. Among them, destruction by thermal and thermobaric impact for fast (instantaneous) destruction of chips is the most optimal.

So. for example, a device is known for destroying electronic storage media in order to prevent third parties from obtaining unauthorized access to data (patent DE10204685. the description of which was published on 14.08.2003). This device is a working gas-generating charge placed in the area of the data carrier, and an igniter functionally associated with it. The igniter can be electrically actuated, powered by the power supply device of the storage medium and can be triggered, for example, by means of a code that is transmitted remotely. When the device is triggered, thermal damage to the data carrier occurs, in addition, metal-containing aerosols are formed, which are deposited on the data carrier in the form of a non-removable layer of metal oxide.

The disadvantages of this design is that there is a partial damage to the data carrier, which can be recovered.

Another device for emergency destruction of memory chips is known {patent RU2690781. the description to which was published on 06/05/2019), which, in terms of the number of similar features and the achieved technical result, is the closest analogue to the claimed invention. The device includes a hermetic housing in which a working charge is installed, made of a pyrotechnic composition, an actuation unit containing current-carrying electrodes with a burnable glow bridge, with the possibility of direct connection to the data carrier power supply device. The activation unit also includes an activation element made of an igniting pyrotechnic composition. The temperature realized during the combustion of the pyrotechnic composition of the working charge exceeds the melting temperature of the material of the memory chip crystal (silicon). The use of an actuation element made of an igniting pyrotechnic composition makes it possible to realize a pressure gradient during combustion, which ensures the transfer of hot chemically active combustion products to the chip chip, thereby further increasing the destruction efficiency.

The disadvantage of the closest analogue is that over time, damage to the structure can occur, which, without monitoring its integrity, can lead to failure of operation. In addition, there is no protection against static electricity discharges, which reduces the performance and safety level during operation, that is, it can lead to abnormal operation.

The technical result achieved by using the claimed invention is to increase the reliability of operation of the device for destroying memory chips and to increase the level of personnel safety when operating the device.

The technical result is achieved due to the fact that in the design of the device for the emergency destruction of memory chips, including a sealed housing, in which a working charge is installed, which is a metal tube equipped with a pyrotechnic composition, an initiating element containing current-carrying electrodes with a burnable incandescent bridge, for electrical communication with data carrier power supply device, new is that. that a weakening groove is made on the outer surface of the working charge tube, an electronic unit is additionally introduced into the design of the device, through which a data carrier is connected to the device via a multi-core cable and which includes a capacitive storage device with a capacitive storage charge control unit, an activation control unit, a control unit the integrity of the pumping bridge and the passage of signals, while the capacitive storage is connected to the pumping bridge through transistor MOS switches, in parallel with which a diode is connected by reverse connection, transistors included in the activation control unit circuit are connected in cascade connection to the gates of transistor MOS switches, in addition, two individual transistor switches included in the circuit of the charge control unit are connected through a resistor in parallel to the capacitive storage, and two limiting resistors and transistor switches included in the circuit are connected in series to the incandescent bridge. to him a unit for monitoring the integrity of the incandescent bridge and the passage of control signals for the possibility of connecting to a test current source, which is additionally equipped with a data carrier device.

The implementation of a weakening groove on the tube of the working charge, which provides a rupture of the tube and a given direction of expansion of the products of combustion of the pyrotechnic composition, causes a local thermobaric destructive effect of the information carrier.

The inclusion of an electronic unit in the destruction device, which includes a capacitive storage device with a charge control unit, an actuation control unit, a unit for monitoring the integrity of the incandescent bridge and signal passage, allows, without a significant increase in the dimensions of the device, to avoid the disadvantages inherent in the closest analogue and increase the safety of operation and reliability of operation of the proposed device.

Connecting a capacitive storage device to an incandescent bridge through transistor MOS switches, in parallel with which a diode is connected by reverse connection, transistors included in the circuit of the capacitive storage charge control unit are connected in cascade connection to the gates of transistor MOS switches, and connecting two separate transistor switches included in this the same circuit, through a resistor in parallel with the capacitive storage device, makes it possible to ensure the safety of the destruction device and maintain the reliability of its operation under adverse operating conditions, for example, under the influence of short-term ionizing radiation, tk. allows you to protect the electric igniter circuit from an abnormal discharge of a capacitive storage that can open p-n junctions at MOS transistors and a diode, and when discharging a capacitive storage through transistor switches, significantly limit the discharge current in the circuit to a safe value, due to the current being drained into the diode circuit. In order to ensure the safety of operation of the destruction device when it is disconnected from the power supply, an emergency discharge of the capacitive storage is carried out without using the pyrotechnic composition. Also implemented is the possibility of controlled discharge of a capacitive storage by applying a TTL-level signal to the charge control unit of a capacitive storage. The absence of a galvanic connection between the electronic block and the metal case of the destruction device makes it possible to increase its noise immunity from static electricity and electromagnetic radiation.

Connecting in series to the glow bridge two limiting resistors and transistor switches for the possibility of connecting to a test current source, which is additionally equipped with a data carrier device, provides the current in the circuit up to 40 mA, necessary to check the integrity of the device without damaging it.

In FIG. 1 shows the design of the proposed device, Fig. 2 is a circuit diagram of the electronic block, in Fig. 3 - installation of the device over the simulator during its testing for performance, figure 4 - the results of the operation of the device on the simulator.

Explanation for FIG. 1:

1 - body of the destruction device; 2 - socket for connecting to the data carrier power supply device; 3 - electronic block; 4 - working charge; 5 - electric igniter; 6 - current-carrying conductors; 7 - printed circuit board.

An example of a specific implementation of the claimed device is a small-sized device for the emergency destruction of radio elements containing protected information. The device contains a housing 1 with holes for mounting it on the printed circuit board 7 of the device above or below the information carrier to be destroyed. The device also includes an electronic block 3. A ten-wire cable with a socket 2 departs from the block for connecting a data carrier to the power supply device (not shown in the figure). On block 3, a working charge 4 with an electric igniter (EV) 5 is installed, which is electrically connected to block 3 by current-carrying conductors 6. Charge 4 is a failure of a brass tube with a pyrotechnical composition. The tube is made with a stress concentrator in the form of a weakening groove. The tube is installed with a groove to the microcircuit to be destroyed. EV 5 includes a burnable nickel filament bridge. The internal cavity of the housing 1 is filled with a compound, providing tightness, mechanical and electrostatic strength of the contents.

The circuit diagram of the electronic block (Fig. 2) includes a capacitive energy storage in the form of a block of capacitors CH, which is connected in parallel to the nickel bridge of the EV incandescence through transistor MOS switches K1 and K2. Transistors FI and FI, which receive TTL signals (Input 1, Input 2 and Input 3), are connected in cascade to the gates of the MOS switches. Parallel to the keys K1 and K2, a 2D510A diode is connected by reverse switching (in the DG diagram). In parallel, CH are connected through a discharge resistor (Rraz) two separate transistor switches (RA and RU in the diagram). It is possible to connect a low current generator, which is additionally equipped with a data carrier device (GT) through transistor switches, in series with a burnable bridge through a limiting resistor.

The principle of operation of a small-sized device for the emergency destruction of memory chips is as follows.

In the operating mode, voltage is applied to charge the capacitive storage of the electronic unit 3 with electrical energy. The capacitive energy storage device is charged to the required level from 16 to 19 V. At the time necessary for the operator, the device triggers: a TTL level signal is received via the “input 3” line, which in turn unblocks “input 1” and “input 2”. which simultaneously receive TTL status signals, respectively, "logical 1" and "logical 0". The transistor MOS switches of the electronic unit 3 are opened. The storage capacitors begin to discharge onto the nickel bridge of the EV 5. The nickel bridge heats up and melts, ignites the pyrotechnic composition in the charge 4. The composition ignites and, burning, releases a large amount of high temperature gases. When a certain pressure is reached, the brass charge tube 4 opens along the groove. Fragments and products of combustion of the pyrotechnic composition of the charge 4 hit the body of the data carrier (microcircuit, radio element) on the printed circuit board 7 of the device at high speed, causing significant deformation of the body and destroying the contents. Thus, the storage medium is guaranteed and irretrievably destroyed.

To ensure at any time monitoring the integrity of the bridge EV 5 and the passage of control signals through one of the cores of the ten-wire loop, a current of no more than 40 mA is passed. which indicates the serviceability or malfunction of the incandescent bridge. Monitoring the passage of control signals and the serviceability of the activation control unit is carried out at the stage of manufacturing and product quality control using auxiliary equipment, or can be implemented in the data carrier power supply device.

The tests carried out experimentally confirmed the operability of the proposed destruction device, the reliability of its operation and the irretrievable guaranteed destruction of the data carrier (chip, radio element). As a data carrier, a microcircuit simulator was used - a glass plate fixed between steel sheets 0.5 mm thick (Fig. 3). The figure 4 shows the results of the operation of the device on the simulator: fragments of a glass plate (microcircuit chip simulator) - on the left, deformed metal plates of the microcircuit housing simulator (radio element) - on the right. The device operates in a wide temperature range, while providing high resistance to mechanical stress and resistance to static electricity discharges.

Claims (1)

A device for the emergency destruction of memory chips, including a sealed housing in which a working charge is installed, which is a metal tube equipped with a pyrotechnic composition, an initiating element containing current-carrying electrodes with a burnable incandescent bridge, for electrical communication with a data carrier power supply device, characterized in that on a weakening groove is made on the outer surface of the working charge tube, an electronic unit is additionally introduced into the device design, through which a data carrier is connected to the device via a multi-core cable and which includes a capacitive energy storage unit with its charge control unit, an actuation control unit, a bridge integrity control unit incandescence and passage of control signals, while the capacitive storage is connected to the incandescent bridge through transistor MOS switches, in parallel with which a diode is connected by reverse switching, to the gates of the transistor of the main MOS switches, the transistors included in the activation control unit circuit are connected in cascade connection, in addition, two separate transistor switches included in the charge control unit circuit are connected through a resistor in parallel to the capacitive storage, and two limiting resistors and transistor switches are connected in series to the incandescent bridge , included in the circuit of the node for monitoring the integrity of the incandescent bridge and the passage of control signals for the possibility of connecting to a test current source, which is additionally equipped with a data carrier device.

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