RU65927U1 - ACCESS RESTRICTION SYSTEM - Google Patents

Abstract

The utility model relates to locking devices and can be used to protect the entrances of residential buildings, office premises, industrial enterprises, safes, cars, etc. from unauthorized access. The technical task of this solution is to increase the degree of reliability due to the complexity of manufacturing a duplicate key. The problem is solved in that in the access restriction system, consisting of a reader and an electronic key containing a chip on a silicon chip, including a transistor key located in a hollow sealed disk case of two electrically disconnected halves, the output of the chip is electrically connected to each of the halves, according to the solution, the microcircuit further comprises a magnetosensitive sensor with an encoder for controlling the transistor key, and the reader is equipped with a source nick magnetic field.

Description

The utility model relates to locking devices and can be used to protect the entrances of residential buildings, office premises, industrial enterprises, safes, cars, etc. from unauthorized access.

Known electronic key and lock (see patent for the invention of the Russian Federation No. 2117745, IPC EV 05/47), providing increased privacy. To do this, a key with a counter with a bit of output, a logical element I, a RAM with a single-bit output, a connector or a system of optical emitters and receivers, and using a RAM lock similar to a RAM key, but with a size equal to the size of one code, is used in the key , digital noise generator, second RS flip-flop, D flip-flop, logic elements 2I - NOT and 2IL - NOT, switch, control and recording signal generation circuit, waiting multivibrator, reset signal generation circuit, operating mode switch, buttons Barter code and connector or optical emitters and receivers of the system. The lock code is changed by pressing the code change button using a digital noise generator, so that the code remains inaccessible to the user or other person. The lock opens after its code coincides with the code received from the key from a certain distance using infrared radiation or in another way. Codes can be copied by the user from the RAM of the lock to the RAM of the key and vice versa using a connector or a system of optical emitters and receivers, in the particular case of application, the codes can be copied from the RAM of one key to the RAM of another key.

However, this design is complex and expensive and sensitive to emitter contamination.

Contact type electronic keys are known.

Known electronic key containing a contact group, a housing and a pen. It has a code combination in a chip located in the key body. The case is mounted in a plastic handle and made in the form of a “tablet” consisting of a metal cup and a lid, isolated from each other (see patent for utility model of the Russian Federation No. 24597, IPC Н01Н 13/14).

Known digital contact key DC-2000 and a reader (Touch Memory Cyfral), designed for use in intercom systems and access control and management systems (ACS) for general use. The key contains a hollow body, which consists of two electrically disconnected parts. An electronic circuit based on a silicon crystal is enclosed in a sealed cavity of the housing. Circuit output

connected to the halves of the body by two conductors. The key allows you to get 65536 code combinations.

Closest to the proposed solution is an access restriction system consisting of a reader and an iButton electronic identification key from Dallas Semiconductor. The key is a non-volatile memory located in a metal case that looks like a disk metal battery (See New iButton Electronic Key Identifier Review by Dallas Semiconductor, http://www.gaw.ru/html.cgi/txt/publ/ other / ibutton.htm). The metal is stainless steel. The diameter of the disc is about 17 mm, the thickness is 3.1 mm or 5.89 mm. The disk consists of two electrically disconnected halves. Inside it is hollow. An electronic circuit on a silicon crystal is enclosed in a sealed cavity. The ROM microcircuit contains a unique binary code combination, which is written to the crystal using a laser unit during its manufacture and cannot be changed during the entire life of the device. The output of the circuit is connected to the halves of the disk by two conductors. The halves of the disk form the contact part of the single-wire serial port. At the same time, a data line goes through the central part, the outer shell is the earth. In order for the iButton information to be exchanged with external devices, it is necessary to touch the contact part of the reader (probe) with both surfaces of the halves of the metal disk, which also consists of two parts that are not electrically connected and conduct electrical current.

The openness of technical information about the device keys and the exchange protocols implemented in them makes it easy to duplicate the key. At the same time, no additional equipment is required to simulate Dallas keys - a 64-bit code, which consists of a 48-bit unique serial number, an 8-bit family code and an 8-bit checksum, is usually depicted directly on the key pad, which allows manufacturing its duplicate, possessing either a fingerprint or a high-quality photograph.

The technical task of this solution is to increase the degree of reliability due to the complexity of manufacturing a duplicate key.

The problem is solved in that in the access restriction system, consisting of a reader and an electronic key containing a chip on a silicon chip, including a transistor key located in a hollow sealed disk case of two electrically disconnected halves, the output of the chip is electrically connected to each of the halves, according to the decision, the microcircuit

further comprises a magnetosensitive sensor with an encoder for controlling the transistor key, and the reader is equipped with a magnetic field source.

The utility model is illustrated by the drawing, which shows a schematic diagram of the interface part of the proposed device, where

1) a reading device;

2) electronic key;

3) microcircuit;

4) transistor switch;

5) magnetically sensitive sensor;

6) encoder;

7) the source of the magnetic field;

8) the contact part of the reader.

The access restriction system comprises a reader 1 and an electronic key 2. The electronic key 2 contains a silicon chip 3, including a transistor key 4, located in a hollow sealed disk case of two electrically disconnected halves. The output of the microcircuit is electrically connected to each of the halves. The chip 3 contains a magnetosensitive sensor 5 with an encoder 6 for controlling the transistor switch 4, and the reader 1 is equipped with a magnetic field source 7 and is able to control it. As the source of the magnetic field 7, a solenoid or a permanent magnet located in the region of the contact part 8 of the reader 1 can be selected.

As a magnetically sensitive sensor 5, a planar magnetodiode or a two-collector bipolar magnetotransistor can be selected. As encoder 6, a controlled inverter can be used according to the logical XOR scheme. Being technologically compatible with the planar technology for the production of integrated circuits, these elements can be performed on a single chip with the rest of the key circuit elements in a single technological process.

The device operates as follows. To operate the system and gain access, the key must be brought into contact with the reader 1. When reading the key information, the reader turns on the power of the solenoid 7, the magnetic field of which acts on the magnetically sensitive sensor 5 of the key that controls the encoder 6. The encoder 6 controls the transistor key 4, which ensures the passage of key signals without changes.

When examining a key using various home-made circuits, the need to place it in a magnetic field is not obvious, especially if information about it is not

contained in documents in the public domain. In this case, the magnetosensitive sensor 5 does not give a permission signal to the encoder 6, and the code data comes from the key in a distorted form, which makes it difficult to produce a valid duplicate based on them.

In a simpler version (domestic key Touch Memory Cyfral DC-2000), when the reader does not exchange signals with the key, but only reads its code message, the solenoid can be replaced with a small permanent magnet, which is structurally hidden in the manufacture of a contact pocket.

In the general case, even if information about the need to expose the key to a magnetic field becomes known, there are inevitable difficulties in determining the direction, place of application of the magnetic field, as well as with the availability of the necessary sensors, which together increases the security of the key chip from unauthorized research and copying.

Claims (2)

1. An access restriction system comprising a reader and an electronic key containing a silicon chip, including a transistor key located in a hollow sealed disk case of two electrically disconnected halves, the output of the chip is electrically connected to each of the halves, characterized in that the chip is additionally contains a magnetosensitive sensor with an encoder for controlling the transistor key, and the reader is equipped with a magnetic field source. 2. The system according to claim 1, characterized in that the planar magnetodiode or two-collector bipolar magnetotransistor is selected as the magnetosensitive sensor.