JPH0750885A - Data communication equipment - Google Patents

Abstract

PURPOSE:To improve the safety of a data communication equipment to a reproducing device by carrying out the due processing by means of an additional random number code previously received and stored and the updating and storing this code into an additional random number code included in the received data when the original random number code is coincident with the restored ID code. CONSTITUTION:A memory 12a of a control part 12 of a transmission part stores an ID code and plural random number codes. A data setting part 12b scrambles the ID code for each transmission by using selectively the random number codes stored in the memory 12a and sets the data with addition of a random number code. A data processing part 21b of a control part 21 of a reception part descrambles the scrambled code out of the received data by means of an additional random number code stored in the memory 21a. A comparing/deciding part 21c compares the restored ID code with an ID code stored in the memory 21a. When the coincidence is confirmed between both ID codes, the additional random number code is updated and a control signal is transmitted to a heavy power control part 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data communication device, and more particularly to a data communication device for preventing theft by a copying device such as a learning remote controller.

[0002]

2. Description of the Related Art There is a vehicle control system in which a door of a vehicle is locked and unlocked or an engine start is turned on / off by operating a key of a remote control unit. In a car equipped with such a remote control function, it helps prevent the car from being stolen, and even if you have a lot of luggage on hand, you can lock and unlock the door by simply pressing the key on the remote control unit, and from a remote location. The engine start can be turned on and off, which is convenient for warm-up operation.

In recent years, home automation has been put into practical use, and such a system is convenient because it is possible to control domestic automation equipment such as a rice cooker via a telephone line or the like while in a remote place.

[0004]

However, in a conventional system for transmitting control data to remotely control a controlled device, if the control data is decrypted by eavesdropping, the same data is used for theft or mischief. There was a risk of being In addition, in the conventional system, particularly in a system that locks and unlocks the door of a car, the remote control operation may accidentally control another vehicle, or conversely, the remote control operation of another vehicle may control one's own vehicle. There was a risk of it.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a data communication device capable of improving the safety of the data communication device against a duplication device such as a learning remote controller that has been illegally duplicated.

[0006]

According to the present invention, there is provided a data communication device for transmitting predetermined data from a first device to a second device, wherein the first device comprises an ID code and a plurality of data. A random number code table composed of the random number codes of the above, and each time it is transmitted, the random number code in the random number code table stored in the storage section is selectively used to generate an ID.
A scrambled code, a data setting section for setting data obtained by adding the random number code to the scrambled ID code, and a data setting section for transmitting the data input from the data setting section to the second device The second device includes a data transmission unit, the second device includes a storage unit that stores the ID code and the additional random number code in the data from the first device, and receives the predetermined data from the first device. A data receiving unit for performing, and a data processing unit that descrambles using the additional random number code previously received by the scrambled code of the data received by the data receiving unit and stored in the storage unit; A code comparison and determination unit that determines and compares the ID code that is descrambled and restored and the ID code that is stored in the storage unit. An operation control unit that performs a predetermined operation control according to the content of the received data when the ID code matches by comparison determination, and a previous additional random number code stored in the storage unit when the ID code match. This is achieved by having a code updating unit that updates the additional random number code in the received data.

[0007]

In the data communication apparatus having the above-mentioned structure, the first apparatus is provided with the storage section for storing the random number code table including the ID code and the plurality of random number codes, and the storage section is stored each time the data setting section transmits. The scrambled ID code is scrambled, and the scrambled ID code is added to the scrambled ID code to set the data. Is input to the data transmission unit and transmitted to the second device.

The second device has a storage unit for storing the ID code and the additional random number code in the data from the first device, and the data receiving unit stores the predetermined data from the first device. Of the received data, the scrambled code of the received data is descrambled by the data processing unit using the additional random number code previously received and stored in the storage unit, and the descrambling-processed I is restored.
The D code and the ID code stored in the storage section are compared and determined by the code comparison and determination section, and a predetermined operation is performed by the operation control section according to the content of the data received when the ID code is matched by the comparison and determination. Take control. Also,
When the ID code matches, the code updating unit updates the previous additional random number code stored in the storage unit to the additional random number code in the received data. Therefore, even if a copying device such as a learning remote controller is used during data communication and the transmitted data is copied, it is not possible to copy a remote control unit similar to the real one.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram of essential parts showing an embodiment of a data communication apparatus according to the present invention. First, the configuration will be described. 1 is a remote control unit, 2 is a reception control unit provided in a controlled device such as an automobile, and 3 is a door lock of the automobile.
This is a high-power control unit that performs unlock control and engine on / off control. In the remote control unit 1, 11 is an operation unit, which is an engine on key 11a for instructing to turn on engine start, an engine off key 11b for instructing to turn off engine start, a door lock key 11c for instructing door lock, and a door unlock key. It has a door unlock key 11d for instructing locking. A control unit 12 has a memory 12a and a data setting unit 12b. Reference numeral 13 is a modulator for modulating transmission data, 14 is a transmitter, and 15 is a transmission antenna.

The control section 12 will be described in detail as follows.
The memory 12a of the control unit 12 stores a random number code table including an ID code and a plurality of random number codes. Also,
The data setting unit 12b scrambles the ID code by selectively using the random number code in the random number code table stored in the memory 12a each time it is transmitted, and adds the random number code to the scrambled ID code. Set the data.

In the reception control section 2 of the controlled device, 21
Is a control unit, and includes a memory 21a, a data processing unit 21b,
The comparison / determination unit 21c and the code updating unit 21d are included. Further, 22 is a receiving antenna, 23 is a receiving unit for receiving predetermined data from the remote control unit 1, 2
A demodulation unit 4 demodulates data from the received signal. Here, the control unit 21 will be described in detail.
The memory 12a of No. 1 stores the ID code and the additional random number code. That is, the ID code of the memory 12a is exactly the same as that stored in the memory 12a of the remote control unit 1. Further, the additional random number code is extracted from the transmission data transmitted from the remote control unit 1,
It is a stored code.

Further, the data processing unit 21b of the control unit 21 previously receives the scrambled code of the data received through the antenna 22, the receiving unit 23 and the demodulating unit 24 and stores it in the memory 21a. Descramble using a random number code. Then, the comparison determination unit 2
1c compares and determines the ID code restored by the descramble processing and the ID code stored in the memory 21a. Therefore, the motion I
When the D-codes match, an operation control signal for performing a predetermined operation control according to the content of the received data is output to the high voltage control unit described later. Further, the code updating unit 21d updates the previous additional random number code stored in the memory 21a to the additional random number code in the received data when the ID codes match.

In the high-voltage control unit 3, 31 is a door lock control unit for controlling lock / unlock of the door of the automobile, and 3 is a door lock control unit.
Reference numeral 2 is an engine start control unit for performing on / off control of engine start, and 33 is a horn control unit for controlling ringing of the horn. The horn control unit 33 turns on the reception control unit 2.
It is controlled by an ON / OFF key (not shown) so that, for example, when the door is locked / unlocked, it rings in synchronization.

FIG. 2 shows an example of the transmission data structure. In this configuration example, the first block has an 8-bit scramble ID.
An 8-bit additional random number code is arranged in the code and the second block, and an 8-bit command code corresponding to each key of the operation unit 11 is added to the third block during transmission. FIG. 3 is an example of a command code forming the transmission data. For example, when the engine on key 11a of the remote control unit 1 is pressed, a command code (0000000) meaning engine start on
1) is added.

FIG. 4 is a code diagram for explaining the scramble processing setting of transmission data. Referring to FIG. 4, for example, at the time of the third transmission, the data setting unit 1
2b selectively selects a random number code (01000001) from the random number code table stored in the memory 12a and uses it to scramble the ID code (10101010). In this embodiment, Exclusive-OR (exclusive OR) is used as the scramble process. As a result, the scrambled ID code is (111
01011).

FIG. 5 is an operation explanatory diagram of the remote control unit 1 in the data communication apparatus according to the present invention. The transmission data setting process will be described in detail with reference to FIG. First, when a user first presses a key on the operation unit 11 and a key input corresponding to that key is input to the control unit 12 (step 101), the data setting unit 12b causes the memory 12a to select an ID code and then selectively. The random number code is fetched (step 102), and the ID code is scrambled using the random number code (step 10).
3) The scramble ID code is used. Then, the transmission data including the scramble ID code, the selected random number code (additional random number code), and the command code corresponding to the pressed key is set (step 104). Then, the signal is transmitted to the controlled device side via the modulator 13, the transmitter 14, and the antenna 15 (step 105).

FIG. 6 is an operation explanatory diagram of the reception control unit 2 in the data communication apparatus according to the present invention. The received data processing process will be described in detail with reference to FIG. The control unit 21 of the reception control unit 2 includes the reception antenna 22 and the reception unit 2.
3 and the transmission data from the remote control unit 1 via the demodulation unit 24 (step 201), the scrambled scramble ID code of the data received by the data processing unit 21b of the control unit 21 is received first. A descramble process is performed using the additional random number code stored in the memory 21a (step 202). Therefore, the code comparison / determination unit 21c compares and determines the ID code restored by the descramble processing and the ID code stored in the memory 21a (step 203). As a result of the comparison determination, if the ID codes match (step 204), an operation control signal according to the command code content of the received data is output to the high voltage control unit 3 to execute a predetermined operation and stored in the memory 21a. The additional random number code before the update is updated to the additional random number code in the received data (step 2
05). If the ID code does not match the ID code stored in the memory 21a in the process of step 204, the request is not accepted (step 206).

Next, description will be given of a case where the button is pressed by the air. FIG. 7 is a code diagram for explaining the transmission data processing when the data is pressed in the air. Referring to FIG. 7, for example, if the third and fourth presses are performed and the normal transmission is performed the fifth time, the transmission data structure on the transmission side is scrambled I.
D code (010111001), additional random number code (00
011111), which is a command code (not shown). On the other hand, the receiving side continues to store the additional random number code (01000001) transmitted for the second time. Therefore, since the fifth scramble ID code is created by the additional random number code transmitted the fourth time,
The random number code stored in the memory 21a for the second time cannot be descrambled, and therefore is not accepted. That is, in order for the fifth transmission data to be accepted, the additional random number code of the fourth transmission data must be stored in the memory 21a.

However, in the case of the first transmission, since (00000000) is stored in advance in the memory 21a of the control unit 21 of the reception control unit 2, for example, as the additional random number code, it can be accepted by one transmission. Then, when the key is pressed again (sixth time), the scramble I
The D code is transmitted for the fifth time, and since it is created based on the additional random number code stored in the memory 21a, it becomes descrambleable and is processed. That is, no matter how many times the user pushes the blank button, once the blank transmission is performed, the next transmission can be accepted.

Therefore, even if the transmission data signal is copied by the duplication device by the thief, the content of the transmission data is different each time it is transmitted, so that the thief cannot control the controlled device side. Although the embodiment refers to the on-vehicle data communication device, it can be applied to a home data communication device and the like. Further, the transmission / reception may be optical, wired, or the like in addition to wireless as a medium. Although each code is 8 bits, the number of bits may not be 8 bits.

[0021]

As described above, according to the present invention, the first device is
A storage unit for storing a random number code table including a D code and a plurality of random number codes is provided, and the random number code in the random number code table stored in the storage unit is selectively selected every time the data setting unit transmits. The scrambled ID code is scrambled by using the scrambled ID code, and data obtained by adding the random number code to the scrambled ID code is set, and the data is input to the data transmission unit and transmitted to the second device. The device of 1 includes a storage unit that stores the ID code and the additional random number code in the data from the first device, and the data receiving unit receives the predetermined data from the first device,
The scrambled code of the received data is descrambled by the data processing unit using the additional random number code previously received and stored in the storage unit, and the ID code restored by the descramble processing and the storage The code comparison determination unit compares and determines the ID code stored in the unit, and when the comparison determination determines that the ID code matches, the operation control unit performs predetermined operation control according to the content of the received data. When the updating unit updates the additional random number code stored in the storage unit to the additional random number code in the received data when the ID codes match, a duplication device such as a learning remote controller is used during communication. , Even if the transmission data is copied, it is not possible to copy the remote control unit similar to the real one. Further, even if the button is pressed many times, the normal remote control operation can be performed by only one empty transmission, and the button can be prevented from being pressed.

[Brief description of drawings]

FIG. 1 is a principal block diagram showing an embodiment of a data communication apparatus according to the present invention.

FIG. 2 is an example of a transmission data structure.

FIG. 3 is an example of a command code forming transmission data.

FIG. 4 is an explanatory diagram showing scramble processing settings of transmission data.

FIG. 5 is an operation explanatory diagram of the remote control unit 1 in the data communication device according to the present invention.

FIG. 6 is an operation explanatory diagram of the reception control unit 2 in the data communication apparatus according to the present invention.

FIG. 7 is a code diagram for explaining a process of transmitting data when the data is pressed by a blank button.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 remote control unit 11 operation part 12 control part 12a memory 12b data setting part 13 modulation circuit 14 transmission circuit 2 reception control part 21 control part 21a memory 21b data processing part 21c comparison judgment part 21d code update part 23 reception part 24 demodulation part 3 high voltage Control unit

Claims (1)

[Claims] 1. A data communication device for transmitting predetermined data from a first device to a second device, wherein the first device stores a random number code table including an ID code and a plurality of random number codes. And scrambling the ID code by selectively using the random number code in the random number code table stored in the storage unit each time it is transmitted, and adding the random number code to the scrambled ID code. And a data transmitting unit for transmitting the data input from the data setting unit to the second device, wherein the second device has an ID code and a second device. A data receiving unit for storing the additional random number code in the data from the first device, the data receiving unit for receiving the predetermined data from the first device, and the data receiving unit for receiving the data received by the data receiving unit. A data processing unit that descrambles the scrambled code before using the additional random number code stored in the storage unit, and an ID code that is descrambled and restored and is stored in the storage unit. A code comparison / determination unit that compares and compares the existing ID code; and an operation control unit that performs predetermined operation control according to the content of the data received when the ID codes match according to the comparison and determination of the code comparison and determination unit, And a code updating unit for updating the previous additional random number code stored in the storage unit to the additional random number code in the received data when the codes match.