JP2023064316A - Transmitting device, communication system, transmitting method, and transmitting program - Google Patents

Abstract

To improve the safety of data transmission from a transmitting device to a receiving device.SOLUTION: A portable apparatus 20 includes: a communication device 23 that transmits multiple pieces of data to a vehicle 10; and a control device 21 that controls transmission order of the multiple pieces of data by the communication device 23. The control device 21 divides the multiple pieces of data into multiple pieces of division data each of which contains at least one piece of data, and changes the transmission order of the multiple pieces of division data by the communication device 23 to a random order.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to a transmission device, a communication system, a transmission method, and a transmission program.

2. Description of the Related Art Conventionally, a communication system configured to transmit and receive data between a transmitting device and a receiving device is known. In such a communication system, various measures have been taken to prevent data transmitted from a transmitting device to a receiving device from being intercepted and abused by a third party. For example, in a communication system disclosed in Japanese Unexamined Patent Application Publication No. 2010-4280 (Patent Document 1), a transmitting device transmits data in which the order of a code string is rearranged to a receiving device, while the receiving device receives data from the transmitting device. The order of the code strings in the obtained data is rearranged to the original order.

Japanese Unexamined Patent Application Publication No. 2010-4280

According to the communication system disclosed in Japanese Unexamined Patent Application Publication No. 2010-4280, since the order of the code string in the data transmitted from the transmitting device to the receiving device is rearranged, the data transmitted from the transmitting device to the receiving device is intercepted by a third party, it is possible to make it difficult for the third party to abuse the intercepted data. However, if the order of the code strings in the data transmitted from the transmitting device to the receiving device is rearranged every time in a fixed order, it is possible for a third party to misuse the intercepted data by obtaining the rearrangement order. I can do it.

The present disclosure has been made to solve the above-mentioned problems, and its purpose is to improve the security of data transmission from a transmitting device to a receiving device.

According to one example of the present disclosure, a transmitting device is provided for transmitting data to a receiving device. The transmitting device includes a communication device that transmits a plurality of data to a receiving device, and a control device that controls the transmission order of the plurality of data by the communication device. The control device divides a plurality of data into a plurality of divided data each including at least one data, and changes the transmission order of the plurality of divided data by the communication device to a random order.

According to one example of the disclosure, a communication system is provided. A communication system includes a receiving device and a transmitting device that transmits data to the receiving device. The transmitting device includes a communication device that transmits a plurality of data to a receiving device, and a control device that controls the transmission order of the plurality of data by the communication device. A control device divides a plurality of data into a plurality of divided data each including at least one data, and changes the transmission order of the plurality of divided data by the communication device to a random order.

According to one example of the present disclosure, a transmission method for transmitting data to a computer-based receiving device of a transmitting device is provided. The transmission method includes the steps of: transmitting a plurality of data to a receiving device; and controlling the transmission order of the plurality of data by the transmitting step. The step of controlling includes the step of dividing the plurality of data into a plurality of divided data each including at least one data, and the step of changing the transmission order of the plurality of divided data in the transmitting step to a random order. .

According to one example of the present disclosure, a transmission program for transmitting data to a receiving device is provided. The transmission program causes the computer of the transmission device to execute a step of transmitting a plurality of data to the reception device, and a step of controlling the transmission order of the plurality of data in the transmission step. The step of controlling includes the step of dividing the plurality of data into a plurality of divided data each including at least one data, and the step of changing the transmission order of the plurality of divided data in the transmitting step to a random order. .

According to the present disclosure, it is possible to improve the security of data transmission from a transmitting device to a receiving device.

1 is a diagram showing a configuration of a communication system according to an embodiment; FIG. It is a figure which shows an example of a portable device management data table. It is a figure which shows an example of the data table for authentication. 4 is a flowchart showing data transmission/reception processing of the communication system; 4 is a flowchart showing data generation processing of the transmission device; It is a figure which shows an example of the data generation process in a transmitter. It is a flowchart which shows the reading process of a receiver. It is a figure which shows an example of the reading process in a receiver. 4 is a flowchart showing data retransmission processing of the communication system;

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. The same or corresponding parts in the drawings are denoted by the same reference numerals, and the description thereof will not be repeated.

[Configuration of communication system]
FIG. 1 is a diagram showing the configuration of a communication system 1 according to an embodiment. As shown in FIG. 1, the communication system 1 includes a vehicle 10 and at least one portable device 20. As shown in FIG. The communication system 1 is configured to transmit and receive data between the vehicle 10 and at least one portable device 20 . Vehicle 10 can be a “transmitting device” because it transmits data to portable device 20 , but can also be a “receiving device” because it receives data from portable device 20 . Portable device 20 can be a “transmitting device” because it transmits data to vehicle 10 , but can also be a “receiving device” because it receives data from vehicle 10 .

The vehicle 10 includes a door 15 for getting on and off and a door handle 16. - 特許庁The user of the vehicle can open the door 15 by operating the door handle 16 while the door is unlocked. The door 15 may be opened forward by the user pulling the door handle 16, or may be slidably opened by the user operating a switch (not shown) provided on the door handle 16. good.

The vehicle 10 releases the door lock and unlocks the door 15 when the release condition is satisfied. As an example, when the user holds the portable device 20 and approaches the vehicle 10 within a predetermined range of the vehicle 10 , the doors are unlocked and the doors 15 are unlocked. As another example, when the user operates the door handle 16 of the vehicle 10 while holding the portable device 20, the door is unlocked and the door 15 is unlocked. As another example, when the user operates a door unlock switch provided on the portable device 20, the door is unlocked and the door 15 is unlocked. In unlocking the doors, the authentication key held by the vehicle 10 and the authentication key held by the portable device 20 are collated in the vehicle 10, and the authentication key on the side of the vehicle 10 and the authentication key on the side of the portable device 20 match. Then, the door lock is released and the door 15 is unlocked.

The vehicle 10 includes a control device 11, a memory 12, a communication device 13, and a door lock device 14 as internal components.

The control device 11 is a computer that executes various processes by executing various programs. For example, the control device 11 includes a CPU (Central Processing Unit), FPGA (Field-Programmable Gate Array), GPU (Graphics Processing Unit), and the like.

The memory 12 stores programs and data for the control device 11 to execute various processes. For example, the memory 12 is a storage medium including volatile memory such as DRAM (Dynamic Random Access Memory) and SRAM (Static Random Access Memory), and non-volatile memory such as ROM (Read Only Memory) and flash memory.

Note that the vehicle 10 may include an ECU (Electronic Control Unit) configured by the control device 11 and the memory 12 . Some or all of memory 12 may be configured to perform arithmetic operations by hardware, such as processing circuitry. Furthermore, the vehicle 10 may include non-volatile memories such as HDDs (Hard Disk Drives) and SSDs (Solid State Drives).

The memory 12 stores an authentication program 121 and portable device management data 122 . The authentication program 121 is an example of a “sending program” and includes a program that defines the processing procedure of the control device 11 (processing flows shown in FIGS. 4, 5, and 7, which will be described later). By executing the authentication program 121, the control device 11 can perform processing shown in FIGS.

The portable device management data 122 includes data for managing at least one portable device 20 that has been authenticated and registered with the vehicle 10 in advance. For example, FIG. 2 is a diagram showing an example of a portable device management data table. The memory 12 of the vehicle 10 stores portable device management data 122 in a table format as shown in FIG.

As shown in FIG. 2, the portable device management data 122 includes a portable device ID unique to each portable device 20 that is authenticated and registered with the vehicle 10, and is shared between the vehicle 10 and each portable device 20. At least one rule and an authentication key for unlocking the door 15 shared between the vehicle 10 and each portable device 20 are included.

The portable device ID is a serial number of the portable device 20, a user ID determined by the user who owns the portable device 20, and a password determined by the user. Alternatively, it includes information that can identify the user of the portable device 20 .

The rule includes information used to make it difficult for a third party to decipher the data to be transmitted and received when transmitting and receiving data between the vehicle 10 and the portable device 20 .

Returning to FIG. 1 , the communication device 13 is a communication interface that transmits/receives various data such as an authentication key to/from the communication device 23 of the portable device 20 under the control of the control device 11 .

The door lock device 14 locks or unlocks the door 15 under the control of the control device 11 .

The portable device 20 is a portable terminal such as a smartphone owned by the user of the vehicle 10 or an electronic key. The portable device 20 includes a control device 21, a memory 22, and a communication device 23 as an internal configuration.

The control device 21 is a computer that executes various processes by executing various programs. For example, the control device 21 is composed of a CPU, FPGA, GPU, and the like.

The memory 22 stores programs and data for the control device 21 to execute various processes. For example, memory 22 is a storage medium including volatile memory such as DRAM and SRAM, and non-volatile memory such as ROM and flash memory. Some or all of memory 22 may be configured to perform arithmetic operations by hardware, such as processing circuitry.

The memory 22 stores an authentication program 221 and authentication data 222 . The authentication program 221 is an example of a “sending program” and includes a program that defines the processing procedure of the control device 21 (processing flows shown in FIGS. 4, 5, and 7, which will be described later). By executing the authentication program 221, the control device 21 can perform processing shown in FIGS.

The authentication data 222 includes data for locking or unlocking the door 15 of the vehicle 10 for which authentication registration has been performed in advance. For example, FIG. 3 is a diagram showing an example of an authentication data table. The memory 22 of the portable device 20 stores authentication data 222 in a table format as shown in FIG.

As shown in FIG. 3, the authentication data 222 includes a portable device ID unique to the portable device 20, at least one rule shared between the vehicle 10 and the portable device 20, and rules between the vehicle 10 and the portable device 20. and an authentication key for unlocking the door 15 shared by .

The portable device ID can identify the portable device 20 or the user of the portable device 20, such as a manufacturing number of the portable device 20, a user ID determined by the user who owns the portable device 20, and a password determined by the user. Contains information.

The rule includes information used to make it difficult for a third party to decipher the data to be transmitted and received when transmitting and receiving data between the vehicle 10 and the portable device 20 .

Returning to FIG. 1 , the communication device 23 is a communication interface that transmits and receives various data such as an authentication key to and from the communication device 13 of the vehicle 10 under the control of the control device 21 .

[Data Transmission/Reception Processing of Communication System]
Data transmission/reception processing of the communication system 1 will be described with reference to FIG. FIG. 4 is a flow chart showing data transmission/reception processing of the communication system 1 . The process of the flowchart of FIG. 4 is called from a main routine (not shown) and periodically executed, for example, when a predetermined condition is satisfied. Each step of the vehicle 10 is implemented by the controller 11 executing the authentication program 121 . Each step of the portable device 20 is implemented by the controller 21 executing the authentication program 221 . A step is abbreviated as S below.

As shown in FIG. 4, the vehicle 10 determines whether or not the condition for releasing the door lock is satisfied (S11). If the vehicle 10 does not satisfy the door lock release condition (NO in S11), the process of this flowchart ends.

When the door lock release condition is satisfied (YES in S11), the vehicle 10 executes data generation processing to generate authentication key request data for requesting an authentication key from the portable device 20 (S12). ). Although details will be described later with reference to FIG. 5, the control device 11 of the vehicle 10 corresponds to the mobile device ID of the mobile device 20 acquired in advance based on the mobile device management data 122 (portable device management data table of FIG. 2). Identifies the rules for the authentication and generates Authentication Key Request data based on the identified rules. The vehicle 10 transmits the authentication key request data generated by the data generation process from the communication device 13 to the portable device 20 (S13).

On the other hand, when the portable device 20 receives the authentication key request data from the vehicle 10 through the communication device 23 (S21), the received authentication key request data is read by reading processing (S22). The read processing will be described later with reference to FIG.

The portable device 20 generates authentication key data for transmitting the authentication key to the vehicle 10 by executing data generation processing in response to the authentication key request data (S23). Although details will be described later with reference to FIG. 5, the control device 21 of the portable device 20 specifies rules based on the authentication data 222 (authentication data table in FIG. 3), and generates authentication key data based on the specified rules. do. The portable device 20 transmits the authentication key data generated by the data generation process from the communication device 23 to the vehicle 10 (S24). After that, the portable device 20 ends the processing of this flowchart.

On the other hand, when the vehicle 10 receives the authentication key data from the portable device 20 through the communication device 13 (S14), the received authentication key data is read by reading processing (S15). The read processing will be described later with reference to FIG.

Based on the portable device management data 122 (portable device management data table in FIG. 2), the vehicle 10 identifies an authentication key corresponding to the portable device ID of the portable device 20 that has been acquired in advance, and uses the identified authentication key and the It is determined whether or not the authentication key acquired from the portable device 20 matches (S16).

If the authentication keys match (YES in S16), the vehicle 10 unlocks the door 15 (S17) and terminates the processing of this flowchart. On the other hand, if the authentication keys do not match (NO in S16), the vehicle 10 executes fraudulent processing such as issuing a warning sound (S18), and ends the processing of this flowchart.

[Data generation process of transmission device]
The data generation process of the transmitting device will be described with reference to FIGS. 5 and 6. FIG. FIG. 5 is a flowchart showing data generation processing of the transmission device. FIG. 6 is a diagram illustrating an example of data generation processing in the transmission device. 5 is a flowchart corresponding to the processes of S12 and S23 of FIG. For example, when vehicle 10 executes the process of S12 as a "transmitting device", control device 11 of vehicle 10 executes each step shown in FIG. In this case, the portable device 20 functions as a "receiving device". Also, when the portable device 20 executes the process of S23 as the "transmitting device", the control device 21 of the portable device 20 executes each step shown in FIG. In this case, the vehicle 10 functions as a "receiving device". The data generation processing described below is processing for controlling the transmission order of a plurality of pieces of data by a communication device.

As shown in FIG. 5, the transmitting device divides a plurality of data to be transmitted to the receiving device into a plurality of divided data each containing at least one data (S31).

For example, as shown in FIG. 6, assume an example in which data (authentication key request data or authentication key data) transmitted from the transmitting device to the receiving device is composed of a plurality of data (AAAABBBBCCCCCDDDEEEE). In addition, each of the plurality of data has a data amount of a predetermined unit bit or unit byte.

The transmitting device converts a plurality of pieces of data (AAAABBBBCCCCDDDDEEEE) into first divided data (AAAA), second divided data (BBBB), third divided data (CCCC), and fourth divided data (DDDD). and fifth divided data (EEEE). The transmission device may divide a plurality of data by a predetermined data amount or by a predetermined type, and the criteria for division can be appropriately set by the designer.

Returning to FIG. 5, the transmitting device identifies a rule for changing the transmission order of the plurality of pieces of divided data to a random order (S32). Specifically, when the vehicle 10 corresponds to the “transmitting device”, the control device 11 of the vehicle 10 controls the previously acquired portable device 20 based on the portable device management data 122 (the portable device management data table in FIG. 2). to identify the rule corresponding to the portable device ID of . Also, when the portable device 20 corresponds to the “transmitting device”, the control device 21 of the portable device 20 identifies the rule based on the authentication data 222 (authentication data table in FIG. 3).

The above rules are shared between the sending device and the receiving device. Specifically, the portable device management data 122 (portable device management data table in FIG. 2) held by the vehicle 10 is associated with the portable device ID of each portable device 20 so that each portable device 20 has authentication data. 222 (authentication data table in FIG. 3). The rule shared by the vehicle 10 and the portable device 20 includes information for determining random numbers for changing the transmission order of the plurality of pieces of divided data to a random order.

Further, the rules are regularly or irregularly changed based on criteria (date, time, timer, counter, etc.) shared by the vehicle 10 and the portable device 20 . For example, the control device 11 of the vehicle 10 changes the first rule to the second rule based on the current time using a certain timer, while the control device 21 of the portable device 20 changes the current time using the same timer as the vehicle 10. Based on this, the first rule is changed to the second rule. Thus, the vehicle 10 and the portable device 20 share at least one rule and change the at least one rule at the same timing regularly or irregularly.

After identifying the rule in S32, the transmitting device associates each piece of divided data with identification information (S33). The identification information includes information for the receiving device to restore the plurality of divided data to the plurality of data arranged in the original order.

For example, as shown in FIG. 6, the transmitting device associates "1" as identification information with the first divided data (AAAA), and associates "2" as identification information with the second divided data (BBBB). , associates “3” as identification information with the third divided data (CCCC), associates “4” as identification information with the fourth divided data (DDDD), and associates “4” as identification information with the fifth divided data (EEEE). , and "5" is associated with it. Note that the identification information may be information that allows the receiving device to identify the order and information that does not allow a third party to identify the order, and can be appropriately set by the designer.

Returning to FIG. 5, according to the rule specified in S32, the transmitting device determines a random number for changing the transmission order of the multiple pieces of divided data to a random order, and uses the determined random number to change the transmission order of the multiple pieces of divided data. are changed to a random order (S34).

For example, as shown in FIG. 6, the transmitting device changes the arrangement order of a plurality of pieces of divided data associated with identification information to a random order using random numbers determined according to a rule. In the example of FIG. 6, the transmitting device uses the third divided data (CCCC), the fifth divided data (EEEE), the second divided data (BBBB), the first divided data (AAAA), and the fourth divided data. A plurality of divided data are arranged in order of data (DDDD).

Returning to FIG. 5, the transmitting device generates transmission data to be transmitted to the receiving device by encrypting each of the plurality of divided data and the identification information associated with each of the plurality of divided data (S35). , the processing of this flowchart ends.

For example, as shown in FIG. 6, the transmitting device encrypts identification information (3) and third divided data (CCCC) as a set, and encrypts identification information (5) and fifth divided data (EEEE). encrypted as a set, encrypting the identification information (2) and the second divided data (BBBB) as a set, encrypting the identification information (1) and the first divided data (AAAA) as a set, and encrypting the identification information ( 4) and the fourth divided data (DDDD) are encrypted as a set. The transmitting device generates transmission data including these multiple pieces of encrypted data.

By the data generation process described above, the transmitting device can change the arrangement order of a plurality of data, which are original data, to a random order, and then transmit the transmission data in the changed random order to the receiving device. As a result, the authentication key request data transmitted from the vehicle 10 to the portable device 20 in S13 of FIG. 4 or the authentication key data transmitted from the portable device 20 to the vehicle 10 in S24 of FIG. Since the array order is random, even if a third party intercepts these data, the array order of the multiple data cannot be easily restored to the original order. Thereby, the safety of data transmission between the vehicle 10 and the portable device 20 can be improved.

[Reading process of receiving device]
The reading process of the receiving device will be described with reference to FIGS. 7 and 8. FIG. FIG. 7 is a flow chart showing reading processing of the receiving device. FIG. 8 is a diagram showing an example of reading processing in the receiving device. 7 is a flowchart corresponding to the processes of S15 and S22 of FIG. For example, when vehicle 10 executes the process of S15 as a "receiving device", control device 11 of vehicle 10 executes each step shown in FIG. In this case, the portable device 20 functions as a "transmitting device". Also, when the portable device 20 executes the process of S22 as a "transmitting device", the control device 21 of the portable device 20 executes each step shown in FIG. In this case, the vehicle 10 functions as a "transmitter".

As shown in FIG. 7, the receiving device uses the decryption key shared with the transmitting device to decrypt the encrypted data received from the transmitting device (S41).

For example, as shown in FIG. 8, the receiving device decrypts the encrypted data received from the transmitting device to obtain third divided data (CCCC), fifth divided data (EEEE), second A plurality of pieces of divided data are obtained in the order of the divided data (BBBB), the first divided data (AAAA), and the fourth divided data (DDDD).

Returning to FIG. 7, the receiving device identifies the original arrangement order of the plurality of divided data based on the identification information associated with each of the plurality of divided data (S42). Then, the receiving device restores the plurality of pieces of divided data received in random order to the plurality of pieces of data arranged in the original order according to the identified original arrangement order (S43).

For example, as shown in FIG. 8, the receiving device may receive first divided data (AAAA), second divided data (BBBB), third divided data (CCCC), fourth divided data (DDDD), The arrangement order of the plurality of divided data is returned to the original arrangement order so that the arrangement order of the divided data (EEEE) of No. 5 is obtained. As described above, the identification information is information that allows the receiving device to specify the order, and is information that cannot be specified by a third party. Therefore, even if a third party intercepts the data transmitted from the transmitting device to the receiving device, the third party cannot easily restore the arrangement order of the plurality of data to the original order.

Returning to FIG. 7, the receiving device reads a plurality of pieces of data from the transmitting device from the plurality of pieces of divided data returned to the original arrangement order (S44), and ends the processing of this flowchart.

For example, as shown in FIG. 8, the receiving device selects a plurality of data (authentication key request data or authentication key data) transmitted from the transmitting device to the receiving device from the plurality of divided data returned to the original arrangement order. data (AAAABBBBCCCCDDDDEEEE).

By the reading process described above, the receiving device can read the original multiple data transmitted from the transmitting device to the receiving device from the multiple divided data received in random order from the transmitting device. As a result, the authentication key request data transmitted from the vehicle 10 to the portable device 20 in S13 of FIG. 4 or the authentication key data transmitted from the portable device 20 to the vehicle 10 in S24 of FIG. 4 are arranged in random order. Even if so, the receiving device can read these data.

[Data retransmission process of communication system]
The data retransmission processing of the communication system 1 will be described with reference to FIG. FIG. 9 is a flow chart showing data retransmission processing of the communication system 1 . The process of the flowchart of FIG. 9 is periodically executed by being called from a main routine (not shown), for example, when a predetermined condition is satisfied. When the vehicle 10 functions as a "transmitter", the control device 11 of the vehicle 10 executes each step shown in FIG. In this case, the portable device 20 functions as a "receiving device". Also, when the portable device 20 functions as a "transmitting device", the control device 21 of the portable device 20 executes each step shown in FIG. In this case, the vehicle 10 functions as a "receiving device".

As shown in FIG. 9, the receiving device determines whether or not a transmission error has occurred (S101). If no transmission error has occurred (NO in S101), the receiving device ends the processing of this flowchart. On the other hand, when a transmission error occurs (YES in S101), the receiving device identifies the divided data in which the transmission error occurred (S102). For example, when the arrangement order of the plurality of pieces of divided data is returned to the original order in S43 of FIG. 7, the receiving device determines whether or not there is any missing divided data. If there is, identify the missing divided data. More specifically, when the third divided data (CCCC) is missing among the plurality of divided data as shown in FIG. 8, the receiving device identifies the third divided data (CCCC). If the fourth divided data (DDDD) and the fifth divided data (EEEE) are missing, the fourth divided data (DDDD) and the fifth divided data (EEEE) are identified.

The receiving device transmits retransmission request data for requesting retransmission of the divided data specified in S102 from the communication device to the transmitting device (S103). Note that the retransmission request data includes information that allows the transmitting device to identify the divided data identified in S102. For example, the retransmission request data includes identification information associated with the divided data specified in S102.

On the other hand, when the transmission device receives the retransmission request data from the reception device through the communication device (S105), the transmission device identifies the divided data in which the transmission error occurred based on the retransmission request data (S106). For example, the transmitting device identifies the divided data in which the transmission error occurred based on the identification information included in the retransmission request data.

The transmitting device transmits retransmission data for retransmitting the divided data identified in S106 to the receiving device from the communication device (S107). Note that the transmitting device may generate retransmission data by the data generating process shown in FIG.

On the other hand, the receiving device receives the retransmission data from the transmitting device through the communication device (S104), and ends the processing of this flowchart.

By the data retransmission process described above, the receiving device can acquire only the divided data that could not be properly received due to a transmission error from the transmitting device. Furthermore, since the transmitting device only needs to retransmit to the receiving device the divided data that could not be properly received due to the occurrence of a transmission error, it is possible to reduce the amount of data compared to retransmitting all of the divided data. The time required for retransmission can be shortened. As a result, the communication system 1 can perform processing related to data retransmission more easily and in a shorter time.

[Aspect of Embodiment]
(1) A transmitting device (10, 20) according to one aspect of the present disclosure includes communication devices (13, 23) that transmit a plurality of data to a receiving device (10, 20), and the transmission order of the plurality of data by the communication device. and a control device (11, 21) for controlling the The control device divides a plurality of data into a plurality of divided data each including at least one data, and changes the transmission order of the plurality of divided data by the communication device to a random order.

According to the above aspect, the transmitting device can change the transmission order of a plurality of pieces of data to a random order, and then transmit the transmission data to the receiving device in the changed random order. Therefore, even if a third party intercepts a plurality of transmitted data, it is not possible to easily restore the arrangement order of the plurality of data to the original order. As a result, it is possible to improve the security of data transmission between the transmitting device and the receiving device.

(2) In one aspect, the control device (11, 21) determines the random order according to a rule shared with the receiving device.

According to the above aspect, according to the rule shared between the transmitting device and the receiving device, the transmission order of the plurality of pieces of divided data is changed to a random order. Even if the data is intercepted, the array order of the multiple data cannot be easily restored to the original order. As a result, it is possible to further improve the security of data transmission between the transmitting device and the receiving device.

(3) In one aspect, the control device (11, 21) changes the rule regularly or irregularly.

According to the above aspect, since the rules shared between the transmitting device and the receiving device are changed regularly or irregularly, it is possible to make it difficult for a third party to acquire the rules.

(4) In one aspect, the control device (11, 21) associates each of the plurality of divided data with identification information for the receiving device to return the plurality of divided data to the plurality of data arranged in the original order. .

According to the above aspect, the receiving device can restore the plurality of data received in random order to the plurality of data arranged in the original order based on the identification information.

(5) In one aspect, the control device (11, 21) encrypts each of the plurality of divided data and the identification information associated with each of the plurality of divided data.

According to the above aspect, since the identification information for returning the plurality of data to the plurality of data arranged in the original order is encrypted, it is possible to make it difficult for a third party to obtain the identification information. .

(6) In one aspect, when a transmission error occurs in a plurality of divided data, the control device (11, 21) transmits the divided data in which the transmission error occurred among the plurality of divided data from the communication device to the receiving device. resend.

According to the above aspect, the transmitting device only needs to retransmit to the receiving device the divided data that could not be properly received due to the occurrence of a transmission error. Therefore, the time required for data retransmission can be shortened, and the processing related to data retransmission can be performed more easily and in a shorter time.

(7) A communication system (1) according to one aspect of the present disclosure includes a receiver (10, 20) and a transmitter (10, 20) that transmits data to the receiver. The transmitting device includes a communication device (13, 23) that transmits a plurality of data to a receiving device, and a control device (11, 21) that controls the transmission order of the plurality of data by the communication device. The control device divides a plurality of data into a plurality of divided data each including at least one data, and changes the transmission order of the plurality of divided data by the communication device to a random order.

According to the above aspect, the transmitting device can change the transmission order of a plurality of pieces of data to a random order, and then transmit the transmission data to the receiving device in the changed random order. Therefore, even if a third party intercepts a plurality of transmitted data, it is not possible to easily restore the arrangement order of the plurality of data to the original order. As a result, it is possible to improve the security of data transmission between the transmitting device and the receiving device.

(8) In a certain aspect, the receiving device is mounted in a vehicle, returns a plurality of divided data received in random order to a plurality of data arranged in the original order, Unlock the vehicle based on multiple data.

According to the above aspect, the receiving device mounted on the vehicle performs authentication by restoring the plurality of divided data received in random order from the transmitting device to the plurality of data arranged in the original order, and as a result, Vehicle can be unlocked.

(9) A transmission method according to one aspect of the present disclosure is a transmission method for transmitting data to a reception device (10, 20) by a computer (11, 21) of a transmission device (10, 20). The transmission method includes a step of transmitting a plurality of data to the receiving device (S13, S24) and a step of controlling the transmission order of the plurality of data in the transmitting step (S12, S23). The step of controlling includes a step of dividing a plurality of data into a plurality of divided data each containing at least one data (S31), and a step of changing the transmission order of the plurality of divided data in the transmitting step to a random order. (S34).

According to the above aspect, the transmitting device can change the transmission order of a plurality of pieces of data to a random order, and then transmit the transmission data to the receiving device in the changed random order. Therefore, even if a third party intercepts a plurality of transmitted data, it is not possible to easily restore the arrangement order of the plurality of data to the original order. As a result, it is possible to improve the security of data transmission between the transmitting device and the receiving device.

(10) The transmission program (121, 221) according to one aspect of the present disclosure transmits a plurality of data to the computer (11, 21) of the transmission device (10, 20) to the reception device (10, 20) ( S13, S24) and a step (S12, S23) of controlling the transmission order of the plurality of data in the transmission step. The step of controlling includes a step of dividing a plurality of data into a plurality of divided data each containing at least one data (S31), and a step of changing the transmission order of the plurality of divided data in the transmitting step to a random order. (S34).

According to the above aspect, the transmitting device can change the transmission order of a plurality of pieces of data to a random order, and then transmit the transmission data to the receiving device in the changed random order. Therefore, even if a third party intercepts a plurality of transmitted data, it is not possible to easily restore the arrangement order of the plurality of data to the original order. As a result, it is possible to improve the security of data transmission between the transmitting device and the receiving device.

[Modification]
The present disclosure is not limited to the above embodiments, and various modifications and applications are possible. Modifications applicable to the present disclosure will be described below.

The communication system 1 according to the embodiment described above is applied to an example of unlocking the door 15 of the vehicle 10 by transmitting and receiving an authentication key between the vehicle 10 and the portable device 20 . However, the communication system 1 may be applied to other fields. For example, the communication system 1 may be applied to transmission and reception of an ID and a password when authenticating a customer between a sales site management system and a customer's smart phone. The communication system 1 can be applied to a system that transmits/receives a plurality of data that should not be known to a third party, at least between a transmitting device and a receiving device.

In the communication system 1 according to the above-described embodiment, the arrangement order of a plurality of data included in the transmission data transmitted from the transmission device to the reception device is randomly changed. Abuse by a third party may be prevented. For example, the transmitting device of the communication system 1 does not change the arrangement order of the plurality of data included in the transmission data to be transmitted to the receiving device, but randomly changes the transmission order when transmitting the plurality of data to the receiving device. may

It should be considered that the embodiments disclosed this time are illustrative in all respects and not restrictive. The scope of the present disclosure is indicated by the scope of the claims rather than the above description, and is intended to include all modifications within the scope and meaning of equivalents of the scope of the claims.

1 communication system, 10 vehicle, 11, 21 control device, 12, 22 memory, 13, 23 communication device, 14 door lock device, 15 door, 16 door handle, 20 portable device, 121, 221 authentication program, 122 portable device management data, 222 data for authentication;

Claims (10)

A transmitting device for transmitting data to a receiving device,
a communication device that transmits a plurality of data to the receiving device;
a control device that controls the transmission order of the plurality of data by the communication device;
The control device is
dividing the plurality of data into a plurality of divided data each containing at least one data;
A transmission device that changes the transmission order of the plurality of pieces of divided data by the communication device to a random order. The transmitting device according to claim 1, wherein said control device determines said random order according to a rule shared with said receiving device. 3. The transmitting device according to claim 2, wherein said control device changes said rule periodically or irregularly. The control device associates each of the plurality of divided data with identification information for the receiving device to return the plurality of divided data to the plurality of data arranged in the original order. The transmitter according to any one of Claims 1 to 3. 5. The transmitting device according to claim 4, wherein said control device encrypts each of said plurality of divided data and said identification information associated with each of said plurality of divided data. 2. When a transmission error occurs in the plurality of divided data, the control device retransmits the divided data in which the transmission error occurred from the communication device to the receiving device, among the plurality of divided data. 6. The transmission device according to any one of claims 5 to 7. A communication system,
a receiving device;
A transmitting device that transmits data to the receiving device,
The transmitting device
a communication device that transmits a plurality of data to the receiving device;
a control device that controls the transmission order of the plurality of data by the communication device;
The control device is
dividing the plurality of data into a plurality of divided data each containing at least one data;
A communication system, wherein the transmission order of the plurality of pieces of divided data by the communication device is changed to a random order. The receiving device
installed in the vehicle,
returning the plurality of divided data received in the random order to the plurality of data arranged in the original order;
8. The communication system of claim 7, wherein the vehicle is unlocked based on the plurality of data arranged in the original order. A transmission method for transmitting data to a receiving device by a computer of a transmitting device, comprising:
sending a plurality of data to the receiving device;
and controlling the transmission order of the plurality of data by the transmitting step;
The controlling step includes:
dividing the plurality of data into a plurality of divided data each containing at least one data;
and changing a transmission order of the plurality of pieces of divided data in the transmitting step to a random order. A transmitting program for transmitting data to a receiving device,
to the computer of the sending device,
sending a plurality of data to the receiving device;
and controlling the transmission order of the plurality of data in the transmitting step;
The controlling step includes:
dividing the plurality of data into a plurality of divided data each containing at least one data;
A transmission program comprising the step of changing the transmission order of the plurality of pieces of divided data in the transmission step to a random order.

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