SU1498901A1 - Electronic key - Google Patents

Abstract

The invention relates to the protection of various objects from unauthorized access, in particular, to electronic locks, and allows to increase the reliability by checking the correctness of the codes recorded in the key and overwriting them in case of distortion. Modulo two modulator 2 is used to add a sequence of a matching code and a key code from blocks. When the codes match, a null sequence is issued to the lock. Otherwise, the sequence is corrupted. If necessary, write a new code from the output of the adder 4 enters the block 6 write resolution. If the number of zeros at the input of block 6 is equal to the number of bits of the matching code, a "write" signal passes to the input of trigger 11, which transfers blocks 2 and 3 to the "write" mode. Thereafter, a "control" signal is applied to the connector contact, blocks 2 and 3 are switched to read mode. If the "normal" signal does not appear on the connector pin, the recording process is repeated. After recording new codes, the key is disconnected from the recorder. This will check the correctness of the codes recorded in the key and overwrite them in the event of a distortion. 2 hp f-ly, 3 ill.

Description

3149

The invention relates to the protection of various objects from unauthorized access, in particular to electronic locks,

The purpose of the invention is to increase reliability.

Figure 1 shows the functional diagram of the electronic key; Fig. 3 is a functional block diagram of the memory of the corresponding code;} in Fig. 3, a functional block of recording resolution.

The electronic key contains the electrical connector 1, block 2 of the memory of the correspondence code, block 3 of the memory key key, adders 4 and 5 modulo, block 6 of the write resolution, elements 7-10, trigger 11 element 12 and additional elements 13-15 . I

Correspondence Code Memory Block

contains an address counter 16 and a semi-permanent memory device 17.

The recording resolution block contains the elements HE 18 and 19, the element AND 20, the counter 21 and the decoder 22.

The electronic key works as follows.

When the key is connected to the lock, the power is supplied to the key and the zeroing of the counters of blocks 2 and 3 of the memory and of the resolution block 6 (this mode, as related to the basic development of the device and does not affect the achievement of the target, Fig, 1 not shown).

Then, a sequence of clock pulses arrives at pin 1.1 of the connector into the key, and at pin 1.2 of the connector, the sequence of the matching code arrives. For each clock cycle, a matching code is read from memory block 2 and a key code from memory block 3. The result of the addition of matching codes from adder 4 modulo 2 is fed to the input of adder 5 modulo 2, the second input of which receives the key code from memory block 3. If the codes that enter the key and the codes stored in memory block 2 match, then the key code is fed to pin 1.7 of the connector uncorrupted. Otherwise, at the output of the adder 4 modulo 2, a non-zero sequence is obtained, which on the adder 4 distorts the key code.

If it is necessary to write new codes to the key, the Record signal is given to pin 1.3 of the connector. To determine whether the recording is valid, the sequence of the matching code is fed to the input of pin 1.2 of the connector, as well as in the operating mode, and the pulse sequence of pulses is sent to pin 1.1 of the connector. If the incoming pin 1.2 of the connector and the matching codes stored in memory block 2 are the same, then the zero sequence received at the output of adder 4 through the open element 8 enters the recording resolution block 6, in which the next 1x is calculated by clock pulses d zeros from adder 4 modulo 2. The number of incoming zeros to the input of block 6 of the recording resolution must be equal to the number of bits of the correspondence code. After counting the required number of zeros, block 6 allows the signal to pass. Recording through element 14 at the input of trigger 11. elements 13 and 10 are open in this case, since the control signal on pin 1.6 of the connector is absent. The trigger 11 is set to the Record position and, through opening, the AND 10 element switches the blocks 2 and 3 of the memory to the Record mode. In addition, this signal opens AND elements 7 and 9, through which new codes are recorded in blocks 2 and 3 of memory.

After the new codes are written, the signal on the pin 1.3 of the connector disappears for a short time, and the write permit block 6 | is reset. After that, the control signal is applied to pin 1.6 of the connector. In this case, the elements And 14, 13 and 10 are closed and, thereby, the cl is transferred to the mode of scheming. Similar to that described on pin 1.1 of the key connector, a clock sequence is applied, and on pin 1.2 of the connector, a sequence of a matching code. If the new matching code is recorded correctly, then after a certain number of ticks, a signal appears at the output of the recording resolution block 6, which, through the open element 15, sets the trigger 11 to the initial state, i.e. in read mode. By appearance

the trigger on signal 1 1 in this case is blocked by the element And 13. In addition, the signal from the output of the element 15 is supplied to the pin connector of the key to determine the normal completion of the recording mode and control. If the Normal signal on pin 1.7 of the key connector is not wired, the corresponding code was written distorted, and the process of writing codes was repeated. However, in this case the check of the correctness of the recording is not performed, only the control signal is removed from the contact 1.6 of the connector. Since the trigger 11 is in the Record mode The control key signal is automatically transferred to the recording mode, regardless of whether the signal is recorded at the output of the recording resolution block 6. After the new codes are recorded, the key is disconnected from the recorder, the power and key disappears and the write enable signal from block 6 also disappears, the key is transferred to the read mode and is ready for operation.

Claims (3)

1. An electronic key containing an electrical connector, a memory of the correspondence code, a memory of the key code, modulo-2 adders, a recording resolution block, And elements, and the first contact electrical connector is connected to the first input of the correspondence code memory block, the first input the key code memory and the first input of the recording resolution block; the second contact of the electrical connector is connected to the first input of the first modulo-2 adder and the first input of the first element And, the third contact of the electrical connector is connected to the first input of volts cerned AND gate, the fourth contact electrical connector connected to the first input of the third AND gate, a second input coupled to an output of the fourth AND gate, the second input of the first AND gate, the second input of the memory block code correspondence and the second input the key code memory block, the fifth copy of the electrical connector is connected to the output of the second modulo-2 adder, the first input of which is connected to the output of the first modulo-2 adder and the second input of the second And element, its output connected to the second input of the recording resolution block, the output of the key code memory block is connected to the second input of the second modulo-2 adder; the output of the first element I is connected to the third input of the memory block of the correspondence code, the output of which is connected to the second input of the first modulo-2 adder, different m, which, in order to increase reliability, it comprises a trigger element HE and additional elements, and wherein the third electrical contact terminal is further coupled to a first input of the first additional element, and its second input connected to the the element output is NOT and the first input of the fourth element is AND, the output of the first additional element AND is connected to the first input of the second additional element AND, to the second input of which is connected the output of the recording resolution block and the first one. the input of the third additional element And, the second input connected to the sixth contact of the electric connector and the input element is NOT, the output of the third additional element And is connected to the seventh contact of the electric connector and the first input of the trigger, to the second input of which connected to the output of the second additional element And, and the output of the trigger is connected to the second input of the fourth element And, 2. Key pop, 1, characterized in that the memory of the correspondence code contains an address counter and a memory device, the address counter input being the first input of the block is enabled and written, the counter outputs are connected to the corresponding memory inputs, the first control input of which is by the second entrance code memory block the second control input is the third input of this block, the output of the memory device is the output of the memory of the correspondence code. 7149 3. The key according to claim 1, distinguished by the fact that the recording resolution block contains the elements NOT, the AND element, the counter, the decoder, and the input of the first element NOT connected to the first input of the AND element is the second input the recording resolution block, the output of the element is NOT connected to the first input of the counter, to the second eight the input of which is connected to the output of the element AND, and the outputs of the counter are connected to the inputs of the decoder, the output of the decoder is the output of the recording resolution block and is connected to the second input of the AND element via the second element NOT, the control input of the counter is the first input of the recording resolution block. sixteen 17 BUT