JP2004328199A - Portable device and on-vehicle radio equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress wiretapping of secret data beforehand. <P>SOLUTION: A portable device 200 uses infrared rays as a medium to transmit secret data to on-vehicle radio equipment 100 and uses radio waves as a medium to transmit data other than secret data to the on-vehicle radio equipment 100. Since infrared communication has a shorter communication distance and a higher rectilinear propagation property than communication using radio waves as a medium, a wiretapper must come close to the on-vehicle radio equipment 100 to receive secret data when the secret data is transmitted by infrared communication. Consequently, there is a high probability that the wiretapper is visually found by a driver or the like. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a mobile device and an in-vehicle wireless device that performs wireless communication with the mobile device.
[0002]
[Prior art]
In recent years, for example, in order to perform mutual communication between a mobile device such as a mobile phone and a vehicle-mounted wireless device, it has become mainstream to connect the mobile device and the vehicle-mounted wireless device with a wired connection using a connection device called a cradle. I have. However, when the occupant carries the portable device and gets on it, it is necessary to set the portable device on the cradle, and when the occupant gets off, it is necessary to remove the portable device from the cradle, It was troublesome and lacked convenience.
[0003]
On the other hand, in order to save the trouble of setting and removing the mobile device, an in-vehicle wireless system that performs mutual communication between the mobile device and the in-vehicle wireless device using a radio wave as a medium has been proposed (for example, see Patent Document 1). ).
[0004]
[Patent Document 1]
JP 2001-218262 A
[0005]
[Problems to be solved by the invention]
By the way, in the above-mentioned in-vehicle wireless system, in order to prevent the in-vehicle wireless device from being stolen, when the portable device approaches the in-vehicle wireless device, the in-vehicle wireless device collates the collation data transmitted from the portable device and sets the active state. To be. However, since the collation data is transmitted from a portable device using a radio wave as a medium, there is a possibility that the collation data leaks out of the vehicle compartment and is eavesdropped outside the vehicle.
[0006]
In view of the above, it is an object of the present invention to provide a portable device and an in-vehicle wireless device that suppress wiretapping of transmission data.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, there is provided a portable device for performing wireless communication with an in-vehicle wireless device, wherein secret data is transmitted using infrared rays as a medium. And a second transmitting means (20) for transmitting data other than confidential data to the on-vehicle wireless device using a radio wave as a medium.
[0008]
Here, infrared rays have stronger rectilinearity than radio waves, and communication using infrared rays has a shorter communicable distance than communication using radio waves. Therefore, when confidential data is transmitted to the vehicle-mounted wireless device using infrared as a medium, even if the thief tries to illegally receive the confidential data, the thief must approach the vehicle-mounted wireless device and the portable device. . For this reason, there is a high possibility that a thief will be found by the user of the in-vehicle wireless device and the portable device, and if this is widespread, wiretapping of transmission data can be suppressed.
[0009]
According to the second aspect of the present invention, there is provided a portable device for performing wireless communication with an in-vehicle wireless device, wherein the dividing unit divides transmission data into a plurality of pieces to generate a plurality of pieces of divided data (S300). A first transmitting means (S305) for transmitting other divided data of the plurality of divided data other than at least one of the divided data to the on-vehicle wireless device using a radio wave as a medium; And a second transmitting means (S304) for transmitting to the in-vehicle wireless device.
[0010]
Here, even if the thief tries to receive the transmission data illegally, it is necessary to receive one divided data and all the other divided data in order to know the contents of the transmitted data. However, since one piece of divided data is transmitted using infrared rays as a medium, a thief can receive one piece of divided data by using a vehicle-mounted radio, It is necessary to approach the device, and there is a high possibility that the thief will be found by the user. If the thief spreads, it is possible to suppress wiretapping of transmission data.
[0011]
In particular, as in the third aspect of the present invention, there is provided an operation means (S302) for performing an operation using one divided data and another divided data, and the first transmitting means is provided as another divided data. If the calculation result of the calculation means is transmitted to the in-vehicle wireless device, even if the calculation result of the calculation means is received illegally by a thief, the transmission data is compared with the case where the data is transmitted without processing other divided data. It becomes difficult to restore. If this becomes widespread, wiretapping of transmission data can be further suppressed.
[0012]
According to a fourth aspect of the present invention, there is provided a portable device for performing wireless communication with an in-vehicle wireless device, comprising: a dividing unit that divides transmission data into a plurality of pieces to generate a plurality of pieces of divided data; Determining means for determining an order of arranging a plurality of divided data other than the one divided data by using at least one of the divided data, and determining a plurality of other divided data by the determining means; A first transmitting means for arranging the other plurality of divided data in the order to the vehicle-mounted wireless device using a radio wave as a medium, and a first transmitting means for transmitting at least one divided data to the vehicle-mounted wireless device using an infrared ray as a medium. And 2 transmitting means.
[0013]
Thus, since one piece of divided data is transmitted using infrared rays as a medium, even if a thief tries to illegally receive one piece of divided data, the thief approaches a vehicle-mounted wireless device or a portable device. There is a need. Therefore, as in the first to fourth aspects of the present invention, there is a high possibility that a thief is found by the user of the on-vehicle wireless device and the portable device.
[0014]
Also, even if the thief receives another plurality of divided data illegally, it is necessary to rearrange the other plurality of divided data in order to restore the transmission data. Therefore, as a thief, it is necessary to know the order determined by the determining means, and it becomes difficult to restore the transmission data. If this becomes widespread, wiretapping of transmission data can be suppressed.
[0015]
Further, the inventions described in the above-described claims 1 to 4 may be applied to an in-vehicle wireless device instead of a portable device.
[0016]
Specifically, a first on-vehicle wireless device for performing wireless communication with a portable device as in the invention according to claim 5, wherein the first wireless device transmits confidential data to the portable device using a radio wave as a medium. You may comprise so that it may have a transmission means and the 2nd transmission means which transmits data other than confidential data to a portable apparatus using infrared rays as a medium.
[0017]
According to a sixth aspect of the present invention, there is provided an in-vehicle wireless device for performing wireless communication with a portable device, wherein the transmission data is divided into a plurality of pieces to generate a plurality of pieces of divided data. Means, first transmitting means for transmitting other divided data other than at least one of the plurality of divided data to the portable device using a radio wave as a medium, and portable device using at least one divided data as an infrared ray as a medium And a second transmitting means for transmitting to
[0018]
According to the seventh aspect of the present invention, there is provided an operation means for performing an operation using one divided data and another divided data, and the first transmitting means carries the operation result of the operation means as another divided data. You may comprise so that it may transmit to an apparatus.
[0019]
The invention according to claim 8 is an in-vehicle wireless device for performing wireless communication with a portable device, comprising: a dividing unit that divides transmission data into a plurality of pieces to generate a plurality of pieces of divided data; Determining means for determining an order of arranging a plurality of divided data other than the one divided data by using at least one of the divided data, and determining a plurality of other divided data by the determining means; A first transmitting means for arranging the other plurality of divided data to the portable device using a radio wave as a medium, and a second transmitting means for transmitting at least one divided data to the portable device using an infrared ray as a medium. And transmitting means.
[0020]
Incidentally, reference numerals in parentheses of the above-mentioned units are examples showing the correspondence with specific units described in the embodiments described later.
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION
(1st Embodiment)
FIG. 1 shows an in-vehicle wireless system according to a first embodiment of the present invention. The in-vehicle wireless system includes an in-vehicle wireless device 100 and a portable device 200. The in-vehicle wireless device 100 includes a first wireless unit 10, a second wireless unit 11, a data storage unit 12, an information processing unit 13, and a communication control unit 14.
[0022]
The first wireless unit 10 includes an antenna and a wireless circuit, receives a signal transmitted from the portable device 200 using a radio wave as a medium, and transmits a transmission signal using a radio wave as a medium.
[0023]
The second wireless unit 11 includes a light emitting diode that emits infrared light and a light receiving diode that receives infrared light and outputs an output signal, and receives a signal transmitted from the portable device 200 using infrared light as a medium, The transmission signal is transmitted using infrared rays as a medium.
[0024]
The communication speed of the second radio unit 11 is, for example, 112.5 Kbps, and the communication distance is about 1 m.
[0025]
The data storage unit 12 includes a DRAM, an SRAM, a nonvolatile memory, and the like, and includes verification data (password), personal confidential information (name, address, telephone number, credit card information), and inquiry information for confirming link establishment. (Polling information) and other highly confidential data are stored.
[0026]
Further, the information processing section 13 performs signal processing such as addition of a flag on various types of data. The communication control unit 14 includes a microcomputer, a volatile memory, and the like, and executes a process for determining which of the first and second wireless units 10 and 11 to use based on the type of data.
[0027]
Further, the portable device 200 includes a first wireless unit 20, a second wireless unit 21, a data storage unit 22, an information processing unit 23, and a communication control unit 24. The first wireless unit 20 includes an antenna and a wireless circuit, and receives a signal transmitted from the vehicle-mounted wireless device 100 using a radio wave as a medium. The second wireless unit 21 includes a light emitting diode that emits infrared light and a light receiving diode that receives infrared light and outputs an output signal, and receives a signal transmitted from the on-vehicle wireless device 100 using infrared light as a medium.
[0028]
The data storage unit 22 is composed of a nonvolatile memory or the like, and includes collation data (password), personal confidential information (name, address, telephone number, credit card information), and inquiry information (polling information) for confirming link establishment. Store highly sensitive data.
[0029]
The information processing unit 23 performs signal processing such as addition of a flag on various types of data. The communication control unit 24 includes a microcomputer, a volatile memory, and the like, and performs a process for determining which of the first and second wireless units 20 and 21 to use based on the type of data.
[0030]
Next, the operation of the communication control unit 14 of the in-vehicle wireless device 100 and the communication control unit 24 of the portable device 200 according to the present embodiment will be described with reference to FIGS. FIG. 2 is a flowchart showing processing of the communication control unit 24 of the mobile device 200, FIG. 3A is a flowchart showing details of the inter-device collation processing of FIG. 2, and FIG. 3B is a communication control unit of the on-vehicle wireless device 100. 14 is a flowchart showing details of the inter-device collation processing, FIG. 4 is a flowchart showing details of the data identification processing of FIG. 2, and FIG. 5 is a flowchart showing details of the data transmission / reception processing of FIG. First, in the in-vehicle wireless device 100, the communication control unit 14 causes the first wireless unit 11 to transmit call data at regular intervals.
[0031]
Here, when the user carries the portable device 200 and gets on it, the communication control unit 24 of the portable device 200 receives the call data through the first wireless unit 20. Accordingly, when the reception level of the call data is equal to or higher than the predetermined value, the communication control unit 24 determines that the mobile device 200 itself is approaching the on-vehicle wireless device 100 and sends the First collation data indicating the identification of the device 200 itself is called, and the collation data is transmitted from the second wireless unit 21 (S102).
[0032]
Thereafter, in the in-vehicle wireless device 100, the communication control unit 14 receives the first collation data by the second radio unit 21, and stores the received first collation data and the first collation data stored in the data storage unit 12 in advance. When it is determined that they match each other by collating with the first collation data (S130: YES), the communication control unit 14 of the in-vehicle wireless device 100 is activated. Further, the communication control unit 14 calls the second collation data indicating the identification of the in-vehicle wireless device 100 itself from the data accumulation unit 12, and causes the second wireless unit 11 to transmit the second collation data (S131).
[0033]
Along with this, the communication control unit 24 of the portable device 200 receives the second collation data by the second wireless unit 20 and stores the received second collation data and the data storage unit 22 in advance. The data is collated with the second collation data, and if it is determined that they match each other, the process proceeds to a data identification process (S110).
[0034]
In this data identification process, when a user inputs personal information (that is, confidential information) by operating a key operation unit (not shown) of the portable device 200, a flag is added to the personal information. That is, when the personal information is input together with the flag by operating the key operation unit (S111 in FIG. 4), the communication control unit 24 causes the information processing unit 23 to transmit the personal information (data) and the flag (this will be described later). (S112), and the combined flagged personal information is displayed on a display unit (not shown) so as to be displayed to the user. Again (S113).
[0035]
Thereafter, when the user performs an operation on the key operation unit to indicate that the displayed personal information with the flag is accepted, the personal information with the flag is stored in the data storage unit 22, and the data transmission / reception processing (FIG. The process proceeds to S120 of Step 2). In this data transmission / reception processing, the communication control unit 24 sequentially calls data from the data storage unit 22 and determines whether or not the data is confidential data, that is, data to be prevented from being leaked, for each of the called data. I do.
[0036]
Here, when the above-mentioned flag is added to the data called from the data storage unit 22, it is determined that the called data includes confidential data (for example, personal information). As shown in FIG. 6B, header data (header) is added to the called data (confidential data + flag), and the second wireless unit 21 transmits the data using infrared rays as a medium (S122, S124). When it is determined that the data called from the data storage unit 22 is not confidential data, header data (header) is added to the called data (general data) as shown in FIG. Radio waves are transmitted from the first radio unit 21 as a medium (S123, S124).
[0037]
Thereafter, in the communication control unit 14 of the on-vehicle wireless device 100, when the first wireless unit 10 receives data using a radio wave as a medium, the received data is stored in the data storage unit 22. On the other hand, when the communication control unit 14 receives data via the second wireless unit 11 using infrared as a medium, the communication control unit 14 decomposes the received data into a flag and confidential data, and stores the decomposed confidential data in the data storage unit 22. accumulate.
[0038]
Hereinafter, the operation and effect of the present embodiment will be described. The portable device 200 transmits confidential data to the on-vehicle wireless device 100 using infrared light as a medium, and transmits data other than confidential data to the on-vehicle wireless device 100 using radio waves as a medium. Here, communication using infrared rays as a medium (hereinafter referred to as infrared communication) has a shorter communication distance and stronger straightness than a case using radio waves as a medium.
[0039]
Therefore, as in the present embodiment, when confidential data is transmitted to the vehicle-mounted wireless device 100 by infrared communication, the transmitted confidential data is eavesdropped, that is, even if an attempt is made to illegally receive the confidential data, It is necessary to receive near the vehicle-mounted wireless device 100. Therefore, there is a high possibility that the thief will be found silently by an occupant or the like. If the thief spreads to the general public, eavesdropping on confidential data can be suppressed beforehand.
[0040]
In the above-described embodiment, as shown in FIG. 4, for example, confidential information such as personal information is manually input by key operation or the like as data identification processing. Then, the input data is stored in the data storage unit 22, and whether or not the data is confidential information is determined based on whether or not a flag is added to the data. However, the present invention is not limited to this. 7 and 8 may be used.
[0041]
(1) For example, when input is made by a key operation from the outside, in order to prevent erroneous erasure of the input data, a case is set in which read-only access to the input data is permitted. (S111a in FIG. 7), the input data is determined to be confidential information, a flag is added to the input data, the input data is displayed on a display unit (not shown), and the user is again confirmed (S112). , S113), and then store the data in the data storage unit 22.
[0042]
(2) For example, when the input data is confidential data when input by an external key operation, the input data is stored in a specific folder (hereinafter, referred to as a flag folder) in the data storage unit 22. Then, the data included in the flag folder is periodically called from the flag folder, a flag is added to the called data, and the data is displayed on a display unit (not shown), and the user confirms again (S111a to S111a in FIG. 8). S113) Then, the data is stored in an area other than the flag folder in the data storage unit 22.
[0043]
(2nd Embodiment)
In the above-described embodiment, an example has been described in which the portable device 200 determines whether to use radio waves or infrared rays in accordance with the type of data when performing data transmission. In the embodiment, as shown in FIG. 9, the portable device 200 transmits transmission data using both infrared rays and radio waves without depending on the type of data. FIG. 11 shows a data transmission / reception process of the communication control unit 24 of the mobile device 200 in this case. Hereinafter, a data transmission / reception process performed by the communication control unit 24 will be described with reference to FIG.
[0044]
First, the communication control unit 24 executes a computer program according to the flowchart shown in FIG. First, the transmission data shown in FIG. 10 is called from the data storage unit 23 by the information processing unit 23, and the data excluding the header in the called transmission data is divided into N (N is a natural number), and the N divided data A1 to AN are generated (S300).
[0045]
Here, the first divided data A1 of the N divided data A1 to AN is used as a primary key, and an XOR operation is performed on the primary key and each of the divided data A2 to AN to obtain operation data B2 to BN (S301). , S302).
[0046]
For example, as shown in FIG. 12, the operation data B2 is obtained by performing an XOR operation on the division data A1 and the division data A2, and {B2 = A1 (XOR) A2}. {B3 = A1 (XOR) A3} obtained by XOR operation with data A3, and operation data BN obtained by XOR operation with divided data A1 and divided data AN {BN = A1 (XOR) AN ｝.
[0047]
When the calculation data B2 to BN and the divided data A1 are generated as described above, the divided data A1 is transmitted by the second wireless unit 21 using infrared rays as a medium. In addition to this, the header is transmitted by the first radio unit 20 using a radio wave as a medium, and the calculation data B2 to BN are sequentially transmitted by the first radio unit 20 using a radio wave as a medium.
[0048]
Thereafter, in the on-vehicle wireless device 100, the divided data A1 is received by the second wireless unit 11, the header is received by the first wireless unit 10, and the calculation data B2 to BN are sequentially transmitted to the first wireless unit 10. To receive. Here, using the divided data A1 as a key type, an XOR operation is performed on the key type and each of the operation data B2 to BN to obtain each of the divided data A2 to AN (S400, S401). In addition, the transmission data is restored by combining the header, the divided data A1, and the divided data A2 to AN (S402).
[0049]
Hereinafter, features of the second embodiment will be described. That is, in the portable device 200, the transmission data is decomposed to generate divided data A1 to AN, the divided data A2 to AN are transmitted to the vehicle-mounted wireless device using a radio wave as a medium, and the divided data A1 is transmitted to the vehicle-mounted radio using an infrared ray as a medium. To the machine.
[0050]
Here, even if the thief tries to receive the transmission data illegally, it is necessary to receive all of the divided data A1 to AN. However, since the divided data A1 is transmitted using infrared rays as a medium, a thief approaches the on-vehicle wireless device 100 and the portable device 200 in order to receive the divided data A1, as in the above-described embodiment. Therefore, there is a high possibility that the thief will be found by the user, and if the thief becomes widespread, wiretapping of transmission data can be suppressed.
[0051]
Here, in the present embodiment, XOR operation is performed using the divided data A1 and the divided data A2 to AN to obtain operation data B2 to BN, and as the divided data A2 to AN, the operation data B2 to BN (of the operation means) Since the calculation result is transmitted to the on-vehicle wireless device 100, even if the calculation data B2 to BN are illegally received by a thief, the transmission is performed as compared with the case where the division data A2 to AN are transmitted without processing. It becomes difficult to restore data. If this is widespread, wiretapping of transmission data can be further suppressed.
[0052]
Further, in the present embodiment, since the XOR operation is used instead of general encryption processing to obtain the operation data B2 to BN, the load can be reduced in performing signal processing.
[0053]
Next, the optimal value of the division number N for dividing the transmission data will be described with reference to FIGS.
[0054]
14 and 15, the vertical axis indicates the transmission time of transmission data, and the horizontal axis indicates the risk of eavesdropping on the division number: N. FIG. 14 illustrates an example in which communication by the first wireless unit 20 (communication using radio waves as a medium) and communication by the second wireless unit 21 (communication using infrared rays as a medium) are performed simultaneously. An example in which communication by the first wireless unit 20 and communication by the second wireless unit 21 are performed in a time-division manner will be described.
[0055]
As can be seen from FIGS. 14 and 15, as the number of divisions: N increases, the risk of eavesdropping during transmission of transmission data, that is, the possibility of eavesdropping on transmission data, increases.
[0056]
Therefore, when the communication by the first wireless unit 20 and the communication by the second wireless unit 21 are performed simultaneously, in FIG. 14, the number of divisions Nmax when the transfer time is the maximum value and the transfer time The number of divisions Nmin in the case of the value is obtained, and the number of divisions Nmax and the average value {(Nmax + Nmin) / 2} of the number of divisions Nmin are obtained as optimal values.
[0057]
When the communication by the first wireless unit 20 and the communication by the second wireless unit 21 are performed in a time-division manner, the number of divisions Nmax and the number of divisions Nmin in FIG. The average value {(Nmax + Nmin) / 2} is determined as the optimum value.
[0058]
(Third embodiment)
In the above-described second embodiment, an example has been described in which the first divided data A1 is used as a primary key, and XOR operation is performed on the primary key and each of the divided data A2 to AN to obtain operation data B2 to BN. Instead, the calculation data B1 to BN may be obtained as shown in FIG.
[0059]
That is, an XOR operation is performed on the divided data A1 and A2 to obtain operation data B2 (= A1 (XOR) A2), and an XOR operation is performed on the operation data B2 and the division data A3 to obtain operation data B3 (= B2 (XOR ) A3) is calculated, and an XOR operation is performed on the operation data B3 and the divided data A4 to obtain operation data B4 (= B3 (XOR) A4), and thereafter, operation data B5. .
[0060]
(Other embodiments)
In the above-described embodiment, the XOR operation is performed on the divided data A1 and each of the divided data A2 to AN to obtain operation data B2 to BN, and the operation data B2 to BN are transmitted from the first wireless unit 20 to perform division. Although the example in which the data A1 is transmitted from the second wireless unit 21 has been described, the order of transmitting the operation data A2 to AN is determined based on the divided data A1 instead, and the operation data A2 is transmitted in this determined order. ~ AN may be rearranged and transmitted from the first wireless unit 20.
[0061]
Specifically, the portable device 200 uses the dividing unit that divides the transmission data into N pieces to generate the divided data A1 to AN, and at least one of the divided data A1 to AN. Determining means for determining the order in which a plurality of divided data A2 to AN other than one divided data A1 are arranged; and arranging the other plurality of divided data A2 to AN in the order determined by the determining means. A first transmitting means for transmitting the plurality of divided data A2 to AN from the wireless unit 20 to the vehicle-mounted wireless device 100 using radio waves as a medium, and a second wireless unit using at least one divided data A1 using infrared rays as a medium And a second transmitting means for transmitting the data from the communication device 21 to the on-vehicle wireless device 100.
[0062]
In this case, since the divided data A1 is transmitted using infrared rays as a medium, even if a thief tries to illegally receive the divided data A1, the thief approaches the on-vehicle wireless device 100 and the portable device 200. There is a need. For this reason, as in the above-described embodiment, there is a high possibility that a user of the on-vehicle wireless device 100 and the portable device 200 will find a thief.
[0063]
Even if the thief receives the other divided data A2 to AN illegally, it is necessary to rearrange the divided data A2 to AN in order to restore the transmission data. Therefore, as a thief, it is necessary to know the order of transmitting the divided data A2 to AN, and it is difficult to restore the transmitted data. If this becomes widespread, wiretapping of transmission data can be suppressed.
[0064]
The rearrangement of the divided data A2 to AN and transmission as described above may be applied not to the portable device 100 but to the on-vehicle wireless device 200.
[0065]
In the above-described first and second embodiments, an example in which data is transmitted from the mobile device 100 to the in-vehicle wireless device 200 has been described. Good.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of an in-vehicle wireless system according to a first embodiment of the present invention.
FIG. 2 is a flowchart illustrating an outline of processing of a communication control unit of the mobile device of FIG. 1;
FIG. 3 is a flowchart showing details of a part of the processing in FIG. 2;
FIG. 4 is a flowchart showing details of a part of the process of FIG. 2;
FIG. 5 is a flowchart showing details of a part of the processing in FIG. 2;
FIG. 6 is a diagram showing a data transmission format.
FIG. 7 is a flowchart illustrating a modification of the first embodiment.
FIG. 8 is a flowchart illustrating a modification of the first embodiment.
FIG. 9 is a diagram illustrating a configuration of a vehicle-mounted wireless system according to a second embodiment of the present invention.
FIG. 10 is a diagram for explaining processing by an information processing unit of the mobile device in FIG. 9;
FIG. 11 is a flowchart illustrating a data transmission process performed by a communication control unit of the mobile device in FIG. 9;
FIG. 12 is a diagram for explaining a data transmission process by a communication control unit of the mobile device in FIG. 10;
FIG. 13 is a flowchart illustrating a data reception process performed by a communication control unit of the vehicle-mounted wireless unit.
FIG. 14 is a diagram for explaining the risk of eavesdropping in the second embodiment.
FIG. 15 is a diagram for explaining the risk of eavesdropping in the second embodiment.
FIG. 16 is a diagram for explaining an XOR operation in the third embodiment of the present invention.
[Explanation of symbols]
10, 11, 20, 21 ... wireless unit, 12, 22 ... data storage unit,
13, 23 ... information processing unit, 24, 14 ... communication control unit,
100: on-board wireless device, 200: portable device.

Claims (8)

A portable device for performing wireless communication with an in-vehicle wireless device,
First transmission means (21) for transmitting confidential data to the on-vehicle wireless device using infrared as a medium;
A second transmission unit (20) for transmitting data other than the confidential data to the on-vehicle wireless device using a radio wave as a medium. A portable device for performing wireless communication with an in-vehicle wireless device,
Dividing means (S300) for dividing transmission data into a plurality of pieces to generate a plurality of pieces of divided data;
First transmitting means (S305) for transmitting, to the vehicle-mounted wireless device, divided data other than at least one of the plurality of divided data other than at least one of the divided data;
A second transmission unit (S304) for transmitting the at least one divided data to the on-vehicle wireless device using infrared rays as a medium. Computing means (S302) for performing an operation using the one divided data and the other divided data;
3. The portable device according to claim 2, wherein the first transmitting unit transmits the operation result of the operation unit to the on-vehicle wireless device as the other divided data. A portable device for performing wireless communication with an in-vehicle wireless device,
Dividing means for dividing transmission data into a plurality of pieces to generate a plurality of pieces of divided data;
Determining means for determining an order of arranging a plurality of divided data other than the one divided data by using at least one of the plurality of divided data;
A first transmitting unit that arranges the other plurality of divided data in the order determined by the determining unit and transmits the arranged other divided data to the in-vehicle wireless device using a radio wave as a medium,
A second transmission unit that transmits the at least one divided data to the on-vehicle wireless device using infrared rays as a medium. An in-vehicle wireless device for performing wireless communication with a portable device,
First transmission means for transmitting confidential data to the portable device using a radio wave as a medium,
And a second transmission unit for transmitting data other than the confidential data to the portable device using infrared rays as a medium. An in-vehicle wireless device for performing wireless communication with a portable device,
Dividing means for dividing transmission data into a plurality of pieces to generate a plurality of pieces of divided data;
A first transmitting unit that transmits other divided data other than at least one of the plurality of divided data to the portable device using a radio wave as a medium;
And a second transmitting unit that transmits the at least one divided data to the portable device using infrared rays as a medium. An operation means for performing an operation using the one divided data and the other divided data,
7. The on-vehicle wireless device according to claim 6, wherein the first transmitting unit transmits an operation result of the operation unit to the portable device as the other divided data. An in-vehicle wireless device for performing wireless communication with a portable device,
Dividing means for dividing transmission data into a plurality of pieces to generate a plurality of pieces of divided data;
Determining means for determining an order of arranging a plurality of divided data other than the one divided data by using at least one of the plurality of divided data;
A first transmitting unit that arranges the other plurality of divided data in the order determined by the determining unit and transmits the arranged other divided data to the portable device using a radio wave as a medium;
And a second transmitting unit that transmits the at least one divided data to the portable device using infrared rays as a medium.

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