KR20060021699A - Data communication method of remote system - Google Patents

Abstract

The present invention discloses a data communication method of a remote control system. In the data communication method of the remote control system, when the key button is selected, the remote controller increases the sync counter code, encrypts the unique ID of the remote controller using the increased sync counter code, and then encrypts the unique ID with the encrypted unique ID. A data transmission step of generating and repeatedly transmitting data including the key button and the information of the incremented sync counter code, and the remote control receiver receives the data, and the encrypted unique ID and the key button from the data; A determination step of acquiring the synchronization counter code, and determining whether the data is valid using the encrypted unique ID information and the acquired synchronization counter code; and the remote controller receiver validates the data through the determination step. If it is determined to correspond to the information of the obtained key button It performs the operation, and when determined that the data is not available via the determination step, characterized in that it comprises a frame used step, characterized in that for discarding the data. Therefore, the data communication method of the remote control system of the present invention supports more secure data communication.

Description

Data communication method of remote control system {data communication method of remote system}

1 is a configuration diagram of a remote control system mounted on a general vehicle.

2 schematically illustrates the frame format of data according to the invention;

3A is a flowchart for explaining a data transmission method of a remote controller.

3B is a flowchart for explaining a data reception and authentication method of a remote control receiver.

4 is a timing diagram for explaining a data transmission method of the remote controller of FIG. 3A.

The present invention relates to a data communication method of a remote control system, and more particularly, to a data communication method of a remote control system that provides a function of preventing and encrypting wireless data of a remote control system installed in a vehicle.

FIG. 1 is a diagram illustrating a configuration of a remote control system mounted on a general vehicle, in which a remote controller 1 is carried by a user, and a remote control receiver 2 is installed in a vehicle.

The remote controller 1 internally stores unique ID information, and externally includes key buttons 11 to 13 for selecting start, alarm, and door lock functions. When the user selects the specific key button 11, data including the information of the selected key button 11 and the unique ID information is generated, and the generated data is wirelessly transmitted to the remote control receiver 2.

The remote control receiver 2 internally stores the unique ID information of the remote controller 1 to perform wireless communication with itself, and when data having the same unique ID as the unique ID stored therein is transmitted, interprets the transmitted data. Obtain key button information and perform the corresponding operation.

As such, the remote control system composed of the remote control 1 and the remote control receiver 2 performs wireless data communication in order to maximize the user's ease of use.

Wireless data communications, however, share the same transmission medium (i.e. air) by various wireless communications equipment and devices, and therefore the risk of unauthorized use of data by unauthorized or unauthorized users, ie, persons other than the owner of the vehicle. Will have

In particular, the data used in the remote control system basically includes a unique ID of the remote control, and in some cases, includes key button information for opening the door of the vehicle or key button information for starting the vehicle.

This permits theft of the vehicle even when unauthorized or unauthorized users, ie, persons other than the owner of the vehicle, abuse the data.

Therefore, the remote control system is urgently needed a communication method to prevent unauthorized use of data.

An object of the present invention is to provide a data transmission method of a remote control system that provides a method of encrypting data and authenticating the data to prevent unauthorized use of the data.

In the data communication method of the remote control system of the present invention for achieving the above object, if the remote control key button is selected, increasing the sync counter code, and encrypts the unique ID of the remote control using the increased sync counter code And a data transmission step of generating and repeatedly transmitting data including the encrypted unique ID, the key button, and the information of the increased synchronization counter code, and the remote control receiver receiving the data, and receiving the data from the data. A determination step of obtaining an encrypted unique ID, the key button, and the sync counter code, and determining whether the data is valid using the encrypted unique ID information and the obtained sync counter code; If it is determined through the determination step that the data is valid And performing a task corresponding to the obtained key button information, and discarding the data if it is determined that the data is not valid through the determining step.

In the remote control system data transmission method of the present invention for achieving the above object, if the key button is selected, the synchronization counter code is increased, and the unique ID of the remote controller is encrypted using the synchronization counter code. And a data generation step of generating data including the encrypted unique ID, the key button, and information of the increased synchronization counter code, and a data transmission step of repeatedly transmitting the generated data. do.

Data reception and authentication method of the remote control receiver in the remote control system of the present invention for achieving the above object is a data reception step of obtaining an encrypted unique ID and key buttons and a sync counter code from the received data when receiving the data; And a first comparing step of comparing the obtained sync counter code with the stored sync counter code, and using the obtained sync counter code to decrypt the encrypted unique ID to obtain the unique ID. A second comparison step of comparing a unique ID with the stored unique ID, and the obtained synchronization counter code is greater than the stored synchronization counter code through the first comparison step, and the obtained unique ID is obtained through the second comparison step. If it is confirmed that and the stored unique ID is the same, the reception Authentication data to a valid data, and characterized by comprising an authentication step of performing the operation corresponding to the information of the acquired key buttons.

Hereinafter, a data communication method of the remote control system of the present invention will be described with reference to the accompanying drawings.

FIG. 2 is a diagram schematically illustrating a frame format of data according to the present invention. Referring to the drawings, the frame includes a preamble area TP, a header area TH, a random code area TR, and key data. Area TD, sync counter code area TS, and check sum area TC.

A 40-bit preamble code is included in the preamble area TP, a 4-bit header code is included in the header area TH, a 20-bit random code is included in the random code area TR, and a key code area TD. Six bits of key data are stored in a sync counter code area TS of 20 bits, and a check sum code is stored in a check sum area TC, respectively.

The preamble code informs the remote control receiver of the arrival of a new frame and synchronizes the remote control with the remote control receiver. The preamble code according to the present invention is composed of a 40-bit string having a value of "0".

The header code ends the transmission of the preamble code and informs that the actual data transmission starts. That is, to inform the starting point of the frame. The header code in the present invention has a 4-bit string having a value of "1010".

The random code has unique ID information of the encrypted remote controller. The random code of the present invention is generated by exclusive OR of a unique ID of a remote controller and a sync counter code.

In this case, the unique ID of the remote controller may be a product serial number assigned by the producer to the remote controller or a unique number set by the producer of the product in the production process of the remote controller system.

The unique ID of the remote controller is also stored in the remote controller receiver to perform data communication with the remote controller. This is to allow the remote control receiver to perform data communication with itself, that is, to recognize the remote control corresponding to the remote control receiver.

The key data has information of key buttons of the remote controller selected by the user.

The sync counter code has information for preventing illegal use of data and for encrypting the unique ID of the product. That is, the sync counter code has information for supporting the authentication operation of the frame and the encryption of the data.

Here, the key button selection count value of the remote controller is applied as the sync counter code, and the key button selection count value is incremented with a predetermined unit value every time the user presses a key button of the remote controller.

Since the remote controller of the present invention generates and transmits new data only when a specific key button is newly selected, the number of times of key button selection applied to the sync counter code of each data is always different. In other words, the sync counter code of each data always has a different value. A method of authenticating data validity using the same will be described in more detail below.

The checksum code allows you to check whether the received data is in error. In the present invention, each of the 20-bit random code, the 6-bit data, and the 20-bit sync counter code is converted into 8 bits, summed, and then converted into an 8-bit check sum code. Since this is a known technique, a detailed description thereof will be omitted.

The data of FIG. 2 is represented by a binary number, and is coded using a Manchester coding method in which synchronization is included in the code itself so that the receiving end (in the present invention, the remote control receiver) can automatically synchronize the synchronization.

The Manchester coding method also provides the effect of suppressing the direct current (DC) component of the data and facilitating error detection of the data. Since this is a known technique, a detailed description thereof will be omitted.

3A and 3B are diagrams for explaining a data communication method of a remote control system according to the present invention. 3A is a flowchart illustrating a data transmission method of a remote controller, and FIG. 3B is a flowchart illustrating a data reception and authentication method of a remote controller receiver.

When the remote control and the remote control receiver perform data communication for the first time, they are initialized, and each of the remote control and the remote control receiver in the initialization state sets "0" as the synchronization counter code, and the synchronization counter is pressed whenever the user presses a key button on the remote control. Assume that the code value is increased by "1". In addition, it is assumed that the remote controller in the initialization state sets the data transmission frequency to "0".

Subsequently, a method of transmitting data of the remote controller will be described with reference to FIG. 3A.

When the user selects a specific key button, the remote controller detects this and increases the number of key button selections by "1". The remote controller generates a 40-bit preamble code and transmits it to the remote controller receiver (step S11).

Then, a 4-bit header code for generating the start point of the frame is generated and transmitted to the remote control receiver (step S12).

The exclusive ID of the remote controller and the sync counter code having the value increased in step S11 are exclusively ORed to encrypt the unique ID of the remote controller, set it as a random code, and transmit the random code to the remote controller receiver (step S13).

Then, 6-bit key data corresponding to the key button information selected by the user is generated and transmitted to the remote control receiver (step S14).

In step S11, the number of key button selections having an increased value is set as the sync counter code, and the sync counter code is transmitted to the remote control receiver (step S15).

Convert each of the random code, data, and sync counter code into 8-bit data form, add the converted data together to generate an 8-bit checksum code, and transmit the generated checksum code to the remote control receiver (step S16). .

The generated frame is then wirelessly provided to the remote control receiver, and the number of data transmissions of the remote control is increased by " 1 " (step S17).

After generating and transmitting an inter frame signal composed of data having an arbitrary value (step S18), if the current number of data transmissions is smaller than "3" (step S19), the process proceeds to step S12 again to write the same data. After transmitting again, the data transmission method of the remote controller is terminated.

Repeated transmission of the same data a plurality of times is a data transmission that occurs when a temporary crosstalk occurs in a channel for performing wireless data communication or when a remote control receiver corresponding to a remote controller cannot temporarily receive data. It is to compensate for failure.

In the case where the same data is repeatedly transmitted, the process proceeds to step S12 without passing through step S11 because the remote control receiver determines that the data having the new value is newly received when the preamble data is received.

When the remote controller transmits data having a new value for the first time, the remote controller generates and transmits data including the preamble code through steps S11 to S16, and when transmitting data that has already been transmitted once, through steps S12 to S16. Generate and transmit data that does not contain a preamble code.

Next, a method of receiving and authenticating data of the remote control receiver will be described with reference to FIG. 3B.

When the remote control receiver receives the preamble code from the remote control, it confirms that data having a new value starts to be transmitted (step S21).

Then, the header code, the random code, the key data, the sync counter code, and the check sum code are sequentially received (step S22).

Then, the received checksum code is used to check whether the received data is in error (step S23). Since a technique for checking whether an error of data using a check sum code is a known technique, a detailed description thereof will be omitted.

If it is confirmed that there is an error in the data received in step S22 (step S24), it is checked whether an inter frame is received in order to receive the same data again, and if an inter frame is received (S25), the process goes back to step S22.

On the other hand, if it is confirmed that there is no error in the received data, the remote control receiver compares the synchronization counter code of the received data with the synchronization counter code stored in the remote control receiver to verify whether the received data is valid. As a result of the comparison, if the received sync counter code is larger than the sync counter code stored in the remote control receiver (step S26), the received data is first authenticated as valid data (step S27).

The remote control receiver at this time stores the sync counter code set at the time of initialization (or previously stored) as it is until step S27 is performed. On the other hand, the new data transmitted by the remote controller includes an increased sync counter code and a random code having a changed value as shown in FIG. 3A.

The remote control receiver always stores a sync counter code having a value smaller than the sync counter code included in the newly received data.

In the present invention, by considering the operating characteristics of the remote control receiver to determine the validity of the received data by comparing the synchronization counter code.

Subsequently, if the primary authentication is completed normally, the received random code is decoded into a sync counter code to obtain a unique ID of the remote controller (step S28).

Comparing the unique ID of the remote control obtained through the step S29 and the unique ID stored in the remote control receiver (step S29), if the unique ID of the received remote control and the unique ID stored in the remote control receiver is the same as the result of the comparison, The data is secondly authenticated as valid data (step S210).

Then, the remote control receiver acquires key button information on the received key data of the data, and performs a corresponding operation (step S211), and then ends the data receiving and authentication method of the remote control receiver of the present invention.

On the other hand, if there is an error in the received data but no further inter frame is received (step S25), or if the first authentication through step S26 and the second authentication through step S29 are not performed normally, the remote controller receiver receives the received data. After determining that the data is not available and discarding it (step S212), the method for receiving and authenticating the data of the remote control receiver of the present invention is terminated.

4 is a timing diagram illustrating a data transmission method of the remote controller of FIG. 3A.

As shown in the figure, the remote controller repeatedly transmits the same data.

Continuing to refer to the drawing, the remote controller detects when a user selects a specific key button and detects the preamble area TP, the header area TH, the random code area TR, the key data area TD, and the synchronization counter. The data consisting of the code area TS and the checksum area TC is generated and transmitted to the remote controller primary (31).

When the primary transmission of data is completed, the inter frame IF is generated and first transmitted to the remote controller 32, followed by the header area TH, the random code area TR, the key data area TD, and synchronization. The counter code area TS and the checksum area TC are generated and secondly transmitted to the remote controller (33).

When the primary transmission of the data is completed, the inter frame IF is again generated and transmitted to the remote controller secondaryly (34), and then the header region TH and the random code region TR are the same as when the secondary transmission of the data is performed. ), Generate the data consisting of the key data area TD, the sync counter code area TS, and the checksum area TC, and transmit the data to the remote control three times (35), and then transmit the data of the remote control of the present invention. End the method.

At this time, the inter frame notifies that the data transmission is completed and at the same time serves to inform that the same data as the previously transmitted data is transmitted once again.

As described above, in the data communication method of the remote controller system of the present invention, the remote controller generates a new sync counter code each time data is transmitted, and generates a new random code using the newly generated sync counter code (that is, the unique ID of the remote controller). New encryption).

The remote control receiver performs a first authentication operation using a sync counter code having a new value from the remote control and a second authentication operation using a random code having a new value.

Therefore, even if the user of the remote control system, other than the owner of the vehicle, acquires and copies the data of the remote control system and wants to perform a specific task (such as opening a vehicle door or starting a vehicle), the copied data is copied. The sync counter code and the random code of the data already have information which cannot be used, and become invalid data.

Accordingly, the data communication method of the remote control system of the present invention supports more secure data communication.

In addition, the above-described embodiments of the present invention are limited to a remote control system including a remote control and a remote control receiver. However, this is only a preferred embodiment, and various remote control systems that require a communication method for preventing unauthorized use of data may be used. It is natural to adopt and use them.

Although the above has been described with reference to a preferred embodiment of the present invention, those skilled in the art will be variously modified and changed within the scope of the invention without departing from the spirit and scope of the invention described in the claims below. I can understand that you can.

In the data communication method of the remote control system of the present invention, in the case of the data communication method of the remote control system, the remote control changes the synchronization counter code and the random code of the data every time new data is transmitted, and the remote control receiver performs authentication accordingly. give.

Therefore, the data communication method of the remote control system of the present invention supports more secure data communication.

Claims (18)

A communication method of a remote control system having a remote control having a unique ID assigned thereto, storing a synchronization counter code, the remote control having at least one key button, and a remote control receiver storing the unique ID and the synchronization counter code of the remote control. When the key button is selected, the remote controller increments the sync counter code, encrypts the unique ID of the remote controller using the increased sync counter code, and then encrypts the encrypted unique ID and the key button with the increased sync. A data transmission step of generating and repeatedly transmitting data including information of the counter code; The remote control receiver receives the data, obtains the encrypted unique ID, the key button, and the sync counter code from the data, and uses the data of the encrypted unique ID and the obtained sync counter code. Determining whether the validity of the; And If it is determined that the data is valid through the determining step, the remote control receiver performs a task corresponding to the information of the obtained key button, and discards the data if it is determined that the data is not valid through the determining step. And a frame using step, characterized in that the communication method of the remote control system. The method of claim 1, wherein the sync counter code Wherein each of the at least one key button is incremented each time it is selected. The method of claim 1, wherein the unique ID is And exclusively ORing the sync counter code to encrypt the sync counter code. The method of claim 1, wherein the determining step A first comparing step of comparing the obtained synchronization counter code with the synchronization counter code stored in the remote control receiver; A second comparing step of decrypting the encrypted unique ID using the obtained sync counter code to obtain a unique ID and comparing the obtained unique ID with a unique ID stored in the remote controller receiver; And The sync counter code is greater than the sync counter code stored in the remote control receiver through the first comparison step, and the obtained unique ID and the unique ID stored in the remote control receiver are the same as the sync counter code stored in the remote control receiver. And if it is confirmed, authenticating the data as valid data and performing an operation corresponding to the obtained key button. The method of claim 4, wherein the authentication step And re-storing the synchronization counter code stored in the remote control receiver as the obtained synchronization counter code when it is confirmed that the data is valid data. The method of claim 1, wherein the data is And a frame format including a random code region in which the encrypted unique ID information is stored, a key data region in which the information of the key button is stored, and a sync counter code region in which the increased sync counter code is stored. Communication method of a remote control system. 7. The method of claim 6, wherein said data is A preamble area storing preamble data for indicating that the data starts to be transmitted, a header code area for storing header code for indicating that data having actual information starts to be transmitted, and And a checksum area for storing a checksum code for checking for errors. In the remote control data transmission method having a unique ID is assigned, and having a synchronization counter code and at least one key button, When the key button is selected, the sync counter code is incremented, the unique ID of the remote controller is encrypted using the sync counter code, and then the encrypted unique ID, the key button, and the information on the incremented sync counter code. A data generation step of generating data including; And And a data transmission step of repeatedly transmitting the generated data. The method of claim 8, wherein the sync counter code is And incrementing each time the at least one key button is selected. The method of claim 8, wherein the unique ID information is And exclusively ORing the sync counter codes to encrypt the data. The method of claim 8, wherein the data is And a frame format including a random code region in which the encrypted unique ID information is stored, a key data region in which the information of the key button is stored, and a sync counter code region in which the increased sync counter code is stored. The data transmission method of the remote control. 12. The method of claim 11, wherein said data is A preamble area in which preamble data is stored for informing that the data starts to be transmitted, a header code area in which a header code for informing that data having actual information is starting to be transmitted, and an error in the data And a checksum area for storing a checksum code for checking whether there is a checksum. In the data receiving and authentication method of the remote control receiver corresponding to the remote control, and storing the unique ID and the synchronization counter code of the corresponding remote control, A data receiving step of obtaining an encrypted unique ID, a key button, and a synchronization counter code from the received data when receiving data; A first comparing step of comparing the obtained sync counter code with the stored sync counter code; A second comparing step of obtaining the unique ID by decrypting the encrypted unique ID using the obtained sync counter code, and comparing the obtained unique ID with the stored unique ID; And If the obtained synchronization counter code is greater than the stored synchronization counter code through the first comparison step and the obtained unique ID and the stored unique ID are identical through the second comparison step, the received data And authenticating the data as valid data and performing a task corresponding to the obtained information of the key button. The method of claim 13, wherein the authentication step And re-storing the stored sync counter code as the obtained sync counter code when it is confirmed that the received data is valid data. The method of claim 13, wherein the authentication step If it is confirmed through the first comparison step that the acquired sync counter code is smaller than or equal to the stored sync counter code, the received data is determined to be invalid data and discarded. Receipt and authentication method. The method of claim 13, wherein the authentication step If it is determined that the acquired unique ID and the stored unique ID are different through the second comparison step, the received data is determined to be invalid data and discarded. . The method of claim 13, wherein the data is And a frame format including a random code region in which the encrypted unique ID information is stored, a key data region in which the information of the key button is stored, and a sync counter code region in which the increased sync counter code is stored. Data receiving and authentication method of a remote control receiver. 18. The method of claim 17, wherein the data is A preamble area storing preamble data for indicating that the data starts to be transmitted, a header code area for storing header code for indicating that data having actual information starts to be transmitted, and And a checksum area for storing a checksum code for checking an error.

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