JP2003327055A - Portable information terminal, on-vehicle equipment and antitheft method and program for on-vehicle equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suggest a technique capable of unlocking on-vehicle equipment by using equipment having a low possibility of being a theft object together with the on-vehicle equipment. <P>SOLUTION: When a mutual authentication is performed between a portable information terminal 10 and on-vehicle AV equipment, an operation of the on-vehicle AV equipment 20 is permitted. When the mutual authentication is performed, a door lock and a lock of a safety mechanism can be released. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an in-vehicle device such as an AV (audio / visual) device and a navigation device, and more particularly to an in-vehicle device having an antitheft function.

[0002]

2. Description of the Related Art As is well known, typical equipment mounted on a vehicle is an AV equipment or a navigation device. Some of these onboard devices are expensive and are subject to theft. Therefore, various anti-theft technologies for in-vehicle devices have been proposed. For example, A
Proposal that a detachable front panel is provided on the V device so that the driver can take out the detachable front panel when leaving the vehicle, or the device does not operate unless pre-registered device-specific information is input. Has been proposed. However, in the former case, the stolen device can be used by separately obtaining the detachable front panel. In the latter case, the information unique to the registered device must be stored so as not to be forgotten, and it is complicated to input the information each time the device is used.

In response to the above, for example, Japanese Patent Laid-Open No. 11-227
In Japanese Patent Laid-Open No. 534, the AV device main body is provided with unique identification information, and unless a signal including a release signal matching the identification information is received from a dedicated remote control device,
A technique is disclosed in which the subsequent operation of the device is not permitted, that is, the AV device is not unlocked. According to this technique, theft can be prevented and the user does not need to store the identification information, which is highly convenient for the users of the vehicle and the AV equipment.

[0004]

[Patent Document 1] Japanese Patent Laid-Open No. 11-2275
The technique disclosed in Japanese Patent Publication No. 34-34 requires the user to bring out the remote control device when the user leaves the vehicle. This is because if the remote control device is left in the vehicle together with the AV device, it may be stolen together with the AV device. Although a remote control device has been used for AV equipment so far, it may be said that there is no habit of taking the remote control device out of the vehicle because the remote control device may not be useful outside the vehicle. Therefore, although the remote control device should be taken out of the vehicle when leaving the vehicle to prevent theft, it may be left behind in the vehicle. Therefore, there is a high possibility that the AV device itself will be stolen.

Further, Japanese Patent Laid-Open No. 11-227534 describes that it is difficult to add unique identification information to all mass-produced AV devices, so that there are about 10 types of identification information. There is. Therefore, once the remote control device is stolen, the identification information is decrypted so that the remote control device is forged and an AV having the same identification information is obtained.
The device can also be operated.

In view of the above background, the present invention proposes a method capable of unlocking an in-vehicle device by using the in-vehicle device and a device that is unlikely to be stolen. The present invention also proposes an antitheft method for in-vehicle devices that makes it difficult to decipher the identification information.

[0007]

As described above, since the dedicated remote control device for AV equipment has no utility value when taken out of the office, it is likely to be left in the vehicle. Therefore, the present inventor has considered adding a function of unlocking an in-vehicle device to a device that is useful even if it is taken out of the vehicle and is assumed to be used outside the vehicle if returned.
As a device therefor, the PDA (Pe
Personal digital assistants such as rsonal Digital Assistant) are effective. The portable information terminal is a device that is assumed to be carried by the user at all times, and is less likely to be left in the vehicle when leaving the vehicle, as compared with the conventional remote control device dedicated to in-vehicle devices. Further, in the present invention, when the mobile information terminal unlocks the vehicle-mounted device, that is, when the operation of the vehicle-mounted device is permitted, mutual authentication is performed between the mobile information terminal and the vehicle-mounted device, thereby making it difficult to decrypt the identification information.

The present invention provides a novel antitheft method for in-vehicle equipment by incorporating the above technical elements.
This theft prevention method is specifically embodied as a method for preventing theft of portable information terminals, in-vehicle devices, and in-vehicle devices.
It is also embodied as a program for causing the vehicle-mounted device and the portable information terminal to function the theft prevention method. A portable information terminal of the present invention is a portable information terminal that is configured to be portable by a user, and includes an information transmitting / receiving unit that receives information from an in-vehicle device or transmits information to the in-vehicle device, and an in-vehicle device that receives the information. Based on the information, the mutual authentication unit that performs processing for mutual authentication with the in-vehicle device, and the operation permission that outputs the operation permission information to the in-vehicle device when mutual authentication is approved by the mutual authentication unit And a section.

In the present invention, the portable information terminal is used as a device that permits the operation of the in-vehicle device. Since the portable information terminal is always carried by the user, it is less likely to be left in the vehicle after unlocking (permitting operation) the in-vehicle device, as compared with the remote control device dedicated to the in-vehicle device. Further, since the portable information terminal of the present invention performs mutual authentication with the in-vehicle device, it is extremely unlikely that the identification information set with the in-vehicle device can be decrypted. This mutual authentication means determining whether or not the in-vehicle device is authorized for the mobile information terminal, and conversely, whether or not the in-vehicle device is authorized for the in-vehicle device. For example, if the mobile information terminal is stolen, even if an attempt is made to acquire the identification information from the mobile information terminal, the identification information cannot be acquired unless the other party is an authorized device by mutual authentication. The portable information terminal applied to the present invention may be sold in a state in which a predetermined function is added together with an in-vehicle device, or may be installed in a commercially available portable information terminal with a necessary program. In consideration of the latter mode, the function of performing mutual authentication with the in-vehicle device is important in order to prevent the identification information from being deciphered and stolen.

Further, in addition to the function of unlocking the in-vehicle device, other functions can be added to the portable information terminal. As an example, a so-called keyless entry function can be added. Therefore, the portable information terminal of the present invention can include door lock release signal output means for outputting a door lock release signal for releasing the door lock of the vehicle equipped with the in-vehicle device. Further, it is possible to provide means for outputting a vehicle security mechanism release signal for releasing a vehicle security mechanism such as a vehicle mission lock or steering lock. In this way, the personal digital assistant
It is necessary to carry multiple devices such as a device for unlocking in-vehicle devices and a device for keyless entry as in the past, as it can have not only in-vehicle devices but also functions for vehicle operation control. Disappears.

The present invention also relates to an in-vehicle device used while mounted on a vehicle, comprising an information transmitting / receiving unit for receiving information from the outside or transmitting information to the outside, and an information transmitting / receiving unit for receiving the information from the outside. On the basis of the above, a mutual authentication unit that performs processing for mutual authentication with a device that has transmitted information from the outside, and an operation permission that permits the operation of the in-vehicle device when mutual authentication is accepted by the mutual authentication unit. And a section. Since the in-vehicle device of the present invention performs mutual authentication with an external device, typically a portable information terminal, its operation is not permitted except by an authorized external device. Therefore, the risk of being stolen is greatly reduced. Note that the theft prevention as referred to in the present invention means preventing the theft by notifying the thief in advance that the in-vehicle device cannot operate even if the device is stolen. There is. There are two major patterns for the theft of in-vehicle devices. One is a pattern in which the in-vehicle device is stolen regardless of whether it operates after the theft or another.
The other is a pattern in which only the in-vehicle device that can ensure a predetermined operation after the theft is targeted for the theft. The present invention is effective against the latter theft pattern. Further, in the vehicle-mounted device of the present invention, by using the portable information terminal that the user always carries as the external device, it is possible to reduce the possibility of being left behind in the vehicle and suffering from theft.

The in-vehicle device of the present invention further comprises a connecting means for connecting to the door lock system of the vehicle in which the in-vehicle device is mounted, and operates when the in-vehicle device is connected to the door lock system via this connecting means. The permission unit can permit the unlocking of the door when the mutual authentication is approved by the mutual authentication unit. Further, the in-vehicle device of the present invention further comprises a connecting means for connecting to the vehicle security system of the vehicle in which the in-vehicle device is mounted, and when the in-vehicle device is connected to the vehicle security system via this connecting means, the operation permission is given. When the mutual authentication is approved by the mutual authentication unit, the department can permit the cancellation of the security mechanism. As described above, in addition to having the unlocking function of the in-vehicle device in the mobile information terminal, a function of controlling various operations of the vehicle can be added. As one form thereof, it is for realizing the above-mentioned door lock release function, as well as the mission lock and steering lock release functions.

If an external device, typically a mobile information terminal, is lost or the mobile information terminal fails, a function for permitting the operation of the in-vehicle device should be provided separately. Is desirable. Therefore, it is desirable that the vehicle-mounted device of the present invention be configured so that its operation is permitted even by identification information such as a password. Therefore, the vehicle-mounted device of the present invention includes a storage unit that stores identification information unique to the vehicle-mounted device and an input unit that inputs information for authenticating the identification information, and the operation permission unit receives the identification information. In this case, it is recommended that the configuration permitting the operation of the in-vehicle equipment. Although examples of permitting the operation of the in-vehicle device by inputting the identification information have been seen so far, the present invention is that the input of the identification information is used as a backup function when the external device cannot function. Be different. In other words, as the identification information to be input each time the user mounts the vehicle equipped with the in-vehicle device, the information amount (digit number) of the identification information cannot be increased considering the convenience of the user. On the other hand, if the number of digits is small, it becomes easy to decipher the identification information when stolen. If the number of digits is large, the complexity of input by the user increases. On the other hand, since the identification information of the present invention is intended to function as a backup to the last, even if the number of digits is increased, the user's complexity will not be increased in normal times. Moreover, since it is not used repeatedly during normal times, it is not necessary for the user to memorize the identification information itself during normal times.

The above portable information terminal and vehicle-mounted device realize the following antitheft method. That is, the antitheft method of the present invention is an antitheft method for an in-vehicle device that includes a portable information terminal and an in-vehicle device that can communicate with the portable information terminal. When the authentication step (a) and the mutual authentication between the mobile information terminal and the in-vehicle device are performed in step (a),
And (b) permitting the operation of the vehicle-mounted device. The antitheft method of the present invention is characterized by using a portable information terminal and performing mutual authentication with an in-vehicle device. The user of the in-vehicle device is extremely unlikely to forget to leave the portable information terminal in the vehicle, and thus is unlikely to be the subject of theft. In addition to the function of preventing theft, the portable information terminal can be provided with a function of controlling the operation of the vehicle itself such as unlocking the door and releasing the vehicle security mechanism. It is possible to provide the user with the convenience that the vehicle is ready to run and the operation of the in-vehicle device can be started.

As described above, the portable information terminal of the present invention is
It may be provided in a state where the function is added together with the in-vehicle device, but a form using a commercially available portable information terminal is also possible. In that case, a program for fulfilling a predetermined function is provided, and this program is installed in a commercially available portable information terminal. Therefore, the present invention also provides this program. This program is a program for controlling a portable information terminal as a computer device that permits the operation of in-vehicle equipment, and is a process of receiving information from the in-vehicle equipment or transmitting information to the in-vehicle equipment, and from the received in-vehicle equipment. Based on this information, the mobile information terminal should be made to perform the process of performing mutual authentication with the in-vehicle device and the process of issuing a signal permitting the operation of the in-vehicle device when the mutual authentication is accepted. Characterize.

The on-vehicle device is not limited to the case where the antitheft function by the portable information terminal is provided from the beginning, but the program for performing the process necessary when the antitheft function by the portable information terminal is used is installed. You can also This program is a program for controlling the operation of in-vehicle equipment as a computer device, and a process of receiving information from the outside or transmitting information to the outside,
Based on the received information from the outside, processing for mutual authentication with the device that transmitted information from the outside, and processing to permit the operation of the in-vehicle device when mutual authentication is accepted,
Is executed by an in-vehicle device.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a portable information terminal 1 of the present invention.
0, in-vehicle AV device 20 and in-vehicle AV as in-vehicle device
3 is a block diagram showing a main configuration of a vehicle 40 equipped with the device 20. FIG. The portable information terminal 10, the in-vehicle AV device 20, and the vehicle 40 form a theft prevention system.

The portable information terminal 10 has various functions normally provided as the portable information terminal 10 such as a scheduler and a memo pad, and also has a function of permitting the operation of the in-vehicle AV device 20. The mobile information terminal 10 includes a CPU 11 that executes a predetermined program stored in the ROM 12 or the RAM 13. The ROM 12 stores programs for performing functions such as a scheduler and a memo pad. Further, a function for permitting the operation of the vehicle-mounted AV device 20, specifically, a program for executing communication with the vehicle-mounted AV device 20 and a program for performing mutual authentication with the vehicle-mounted AV device 20 are stored. This also includes a program for generating random numbers used in mutual authentication. Data such as a schedule is stored in the RAM 13. The RAM 13 also temporarily stores the encrypted information received from the in-vehicle AV device 20. This encrypted information will be described later. The ROM 12 may store only the loader, and the battery-backed RAM 13 may store the above-mentioned program.

The mobile information terminal 10 has an operation panel 15 for performing various operations on the mobile information terminal 10. By operating the operation panel 15, the user can perform a desired operation on the mobile information terminal 10. The mobile information terminal 10 includes a display panel 16. The display panel 16 displays a schedule table based on the scheduler and other images. For example, by adopting a touch panel using a liquid crystal display device as the display panel 16, the display panel 16 can be provided with a part or all of the functions of the operation panel 15. The mobile information terminal 10 has a display controller 14 that controls the operation panel 15 and the display panel 16. The display controller 14 detects an operation and an input on the operation panel 15 and transfers the detected information to the CPU 11. Further, the display controller 14 causes the display panel 16 to display a predetermined image based on an instruction from the CPU 11. The portable information terminal 10 is a nonvolatile memory 1 that stores a key (encryption key) for encrypting a random number at the time of mutual authentication between the portable information terminal 10 and the in-vehicle AV device 20.
Have 7. This encryption key is used for the in-vehicle AV device 20.
Shall be valid only between In addition, the mobile information terminal 1
0 transmits information to the in-vehicle AV device 20, or in-vehicle A
Interface 18 for receiving information from V device 20
Is equipped with. As the interface 18, well-known interfaces can be widely applied.

Next, the vehicle-mounted AV device 20 includes a CPU 21 that executes a predetermined program stored in the ROM 22 or the RAM 23. A program for controlling the AV block 30 is stored in the ROM 22. Further, the ROM 22 stores a program for executing communication with the mobile information terminal 10, a program for performing mutual authentication with the mobile information terminal 10 and a program for performing processing after mutual authentication. This also includes a program for generating random numbers used in mutual authentication. The encrypted information received from the mobile information terminal 10 is temporarily stored in the RAM 23.
This encrypted information will be described later. The ROM 22
As described above, it is possible to store only the loader and store the above program in the battery-backed RAM 23.

The vehicle-mounted AV device 20 includes an operation panel 28 for performing various operations on the vehicle-mounted AV device 20. By operating the operation panel 28, the user can cause the vehicle-mounted AV device 20 to perform operations such as playing a song and finding a cue. The vehicle-mounted AV device 20 includes a display panel 29. The display panel 29 is an in-vehicle A
The state of the V device 20, that is, the state that the music is being reproduced or the cueing operation is being performed is displayed. Operation panel 28
As described above, the display panel 29 can be provided with some or all of the above functions. Car AV equipment 20
Has a display controller 27 for controlling the operation panel 28 and the display panel 29. The display controller 27 detects an operation or input on the operation panel 28 and transfers the detected information to the CPU 21. Further, the display controller 27 causes the display panel 29 to display a predetermined image based on an instruction from the CPU 21.
The in-vehicle AV device 20 has a non-volatile memory 25 that stores a key (encryption key) for encrypting a random number at the time of mutual authentication between the mobile information terminal 10 and the in-vehicle AV device 20. This encryption key is valid only with the portable information terminal 10. In addition, the non-volatile memory 25,
A password for permitting the operation of the vehicle-mounted AV device 20 regardless of the portable information terminal 10 is stored.

The on-vehicle AV device 20 has two interfaces 24 and 31. Interface 24
Sends information to the mobile information terminal 10 or receives information from the mobile information terminal 10. The other interface 31 is a security system interface 41 of the vehicle 40.
Also, it is connected to the door lock system interface 43, and sends a signal instructing them to release the security mechanism and release the door lock, as described later. A signal for instructing the release of the security mechanism and the release of the door lock is transferred from the CPU 21 to the interface 31 via the IO port 26.

An AV block 30 is connected to the IO port 26. The AV block 30 is a CD player,
It includes playback devices such as MD players and DVD players. The reproducing apparatus can be operated by performing an operation for reproducing on the operation panel 28 with the disk-shaped storage medium corresponding to the reproducing apparatus mounted.

Next, the vehicle 40 is provided with a security system interface 41 and a door lock system interface 43, and unlocks the security mechanism (not shown) from the interface 31 of the in-vehicle AV device 20. An instruction, an instruction to release the door lock (not shown) is received. An unlocking mechanism 42 for releasing the security mechanism is connected to the security system interface 41. The unlocking mechanism 42
The security mechanism is unlocked based on the security mechanism lock release instruction transmitted via the security interface 41. The security mechanism here includes a mechanism that locks the rotation of the steering wheel or a mission lock mechanism that locks the operation of the shift lever. When the unlocking mechanism 42 receives an instruction to unlock the security mechanism, the unlocking mechanism 42 unlocks the steering lock and the shift lever. Further, the unlocking mechanism 44 releases the door lock based on the door lock release instruction transmitted via the door lock interface 43.

Now, the portable information terminal 1 having the above configuration
0, the operation of the antitheft system including the vehicle-mounted AV device 20 and the vehicle 40 will be described based on the flowcharts shown in FIGS. FIG. 2 is a flowchart showing the basic operation of the anti-theft system. Mobile information terminal 1
By performing a predetermined operation on the operation panel 15 of No. 0, mutual authentication processing is performed between the portable information terminal 10 and the vehicle-mounted AV device 20 (S101 in FIG. 2). The specific content of the mutual authentication process will be described later with reference to FIGS. 3 and 4. When mutual authentication is performed between the mobile information terminal 10 and the in-vehicle AV device 20 by the mutual authentication process (S103 in FIG. 2), the CPU 21 of the in-vehicle AV device 20 operates on the AV block 30 via the IO port 26. By issuing the permission instruction, the operation of the in-vehicle AV device 20 is permitted (S in FIG. 2).
105). When mutual authentication is performed between the portable information terminal 10 and the in-vehicle AV device 20, the CPU 21 also executes the security system interface 41 and the door lock system interface 4 via the IO port 26 and the interface 31.
Send a cancellation instruction to 3. Based on this release instruction, the unlocking mechanism 42 releases the security mechanism, that is, the steering lock and the mission lock (FIG. 2).
S107). In addition, the unlocking mechanism 44 releases the door lock based on the release signal (S109 in FIG. 2).
On the other hand, when mutual authentication is not made between the portable information terminal 10 and the in-vehicle AV device 20 (S103 in FIG. 2),
The operation of the vehicle-mounted AV device 20 is not permitted, and neither the security mechanism nor the door lock is released (S111 in FIG. 2).

Next, the contents of the mutual authentication process will be described with reference to FIGS. 3 and 4. However, this content is merely an example of mutual authentication, and it goes without saying that other mutual authentication methods can be adopted. The mutual authentication process starts with the portable information terminal 10 (PDA in FIGS. 3 and 4).
Generates an arbitrary random number (referred to as random number 1) and encrypts the random number 1 based on the encryption key stored in the nonvolatile memory 17 (S2 in FIG. 3).
01). The random number 1 is stored in the RAM 13. The encrypted random number (encryption information) is the interface 1
The signal is transmitted to the on-vehicle AV device 20 (simply referred to as an AV device in FIGS. 3 and 4) via the S.
3). The vehicle-mounted AV device 20 that has received the encrypted information via the interface 24 once returns to plaintext (this is referred to as plaintext 1). Furthermore, the plaintext 1 is stored in the nonvolatile memory 2
Re-encrypt using the encryption key stored in No. 5 (S205 in FIG. 3). The vehicle-mounted AV device 20 transmits the encrypted information to the portable information terminal 10 (S20 in FIG. 3).
7).

The portable information terminal 10 returns the received encrypted information to plaintext (this is referred to as plaintext 2) (S20 in FIG. 3).
9). Plaintext 2 is stored in the RAM 13. Then, R
The CPU 11 determines whether the random number 1 stored in the AM 13 and the plaintext 2 match (S210 in FIG. 3). Random number 1
If the plaintext 2 and the plaintext 2 match, it means that the mobile information terminal 10 has authenticated the in-vehicle AV device 20 (S211 in FIG. 3). On the other hand, if the random number 1 and the plaintext 2 do not match, the mobile information terminal 1
0 does not authenticate the in-vehicle AV device 20 (S22 in FIG. 3).
7) After all, since the portable information terminal 10 and the in-vehicle AV device 20 are not mutually authenticated, an operation permission instruction is issued to the AV block 30, or the security system interface 4
1 and the door lock system interface 43 are not instructed to release.

When the portable information terminal 10 authenticates the vehicle-mounted AV device 20, the vehicle-mounted AV device 20 next generates an arbitrary random number (this is referred to as the random number 2) and stores the random number 2 in the nonvolatile memory 25. The encryption is performed based on the encryption key being used (S213 in FIG. 4). Note that the random number 1 is R
It is stored in AM23. The encrypted random number (encrypted information) is transferred to the mobile information terminal 1 via the interface 24.
Call to 0 (S215 in FIG. 4). The portable information terminal 1 that receives the encrypted information via the interface 18
0 returns once to plaintext (this is referred to as plaintext 3). Then, the plaintext 3 is encrypted again using the encryption key stored in the non-volatile memory 17 (S217 in FIG. 4).
The mobile information terminal 10 transmits the encrypted information to the in-vehicle AV device 20 (S219 in FIG. 4).

The in-vehicle AV device 20 returns the received encrypted information to plain text (this is referred to as plain text 4) using the encryption key stored in the non-volatile memory 25 (S22 in FIG. 4).
1). The plaintext 4 is stored in the RAM 23. Then, R
The CPU 21 determines whether the random number 2 stored in the AM 23 and the plaintext 4 match (S223 in FIG. 4). Random number 2
And the plaintext 4 match, it means that the in-vehicle AV device 20 has authenticated the portable information terminal 10 (S225 in FIG. 4). That is, since the portable information terminal 10 and the vehicle-mounted AV device 20 have been mutually authenticated, the CPU 21 of the vehicle-mounted AV device 20 issues an operation permission instruction to the AV block 30, and at the same time, the security system interface 41 and the door lock system interface 43. Send a cancellation instruction to. On the other hand, if the random number 2 and the plaintext 4 do not match, the in-vehicle AV device 20 does not authenticate the portable information terminal 10 (S229 in FIG. 4), and eventually, the portable information terminal 10 and the in-vehicle AV device 20 are not mutually authenticated. It does not issue an operation permission instruction to the AV block 30 or issue a release instruction to the security interface 41 and the door lock interface 43.

In the above mutual authentication process, if the in-vehicle AV device 20 is not a genuine product, the plaintext 1 cannot be returned to the appropriate plaintext 1 in S205 of FIG. 3, so that only inappropriate cryptographic information is transmitted to the portable information terminal 10. Can not do it. Random number 1 if this inappropriate cryptographic information is plain-text
Is very unlikely to match. In addition, the mobile information terminal 1
If 0 is not a genuine product, the plaintext 3 cannot be returned to the appropriate plaintext 3 in S217 of FIG. 4, so that only inadequate encrypted information can be transmitted to the vehicle-mounted AV device 20. When this inappropriate cryptographic information is plain-written, it is extremely unlikely that it will match the random number 2.

When the portable information terminal 10 is lost or malfunctions, the operation permission of the in-vehicle AV device 20 can be obtained by inputting the password on the operation panel 28 of the in-vehicle AV device 20. That is, CPU
21 determines whether the input password and the password stored in the non-volatile memory 25 match, and if they match, issues an operation permission instruction to the AV block 30. However, in this situation, it is assumed that the security mechanism and the door lock are unlocked by another means.

According to the present embodiment described above, since the device which permits the operation of the vehicle-mounted AV device 20 is the portable information terminal 10, the possibility that the user will forget to leave the portable information terminal 10 in the vehicle is extremely small. Moreover, since the portable information terminal 10 is used, the security mechanism and the door lock can be released, which is extremely convenient for the user. Further, according to the present embodiment, since the mobile information terminal 10 and the in-vehicle AV device 20 have a system configuration for mutual authentication, the portable information terminal 10 is sold separately from the in-vehicle AV device 20. Even if a commercially available product is used, a sufficient antitheft effect can be exerted.

In the present embodiment, when the portable information terminal 10 is a commercial product, a program for exhibiting the above functions may be installed. As a form of providing this program, a medium for storing the program is attached to the in-vehicle AV device 20 and sold, and
The user who purchased the device 20 can install it on the portable information terminal 10 by a known method. However, the portable information terminal 10 can be sold as an exclusive product of the in-vehicle AV device 20 by being attached to the in-vehicle AV device 20.
In this case, you just need to install the necessary programs from the beginning.

Further, in the present embodiment, the in-vehicle AV device 2
The operation permission of 0 can also be performed by inputting a password. Therefore, even if the portable information terminal 10 is lost or malfunctions, the in-vehicle AV device 20 can enjoy music and the like. The password may be rewritable by the user when the in-vehicle AV device 20 is permitted to operate.

[0035]

As described above, according to the present invention, since the portable information terminal is used, not only the operation permission of the in-vehicle device but also the operation control of the vehicle itself can be performed, which is convenient for the user. It is highly likely. In addition, since the portable information terminal is less likely to be left behind in the vehicle, it is less likely to be stolen. Furthermore, because mutual authentication processing is performed, even when using a commercially available portable information terminal,
Theft can be prevented.

[Brief description of drawings]

FIG. 1 is a block diagram showing a main configuration of an anti-theft system according to the present embodiment.

FIG. 2 is a flowchart showing a basic operation of the anti-theft system according to the present embodiment.

FIG. 3 is a flowchart showing a procedure of mutual authentication processing of the antitheft system according to the present embodiment.

FIG. 4 is a flowchart showing a procedure of mutual authentication processing of the antitheft system according to the present embodiment.

[Explanation of symbols]

10 ... Portable information terminal, 11 ... CPU, 12 ... ROM, 1
3 ... RAM, 14 ... Display controller, 15 ... Operation panel, 16 ... Display panel, 17 ... Non-volatile memory, 18 ...
Interface, 20 ... Car AV equipment, 21 ... CP
U, 22 ... ROM, 23 ... RAM, 24 ... Interface, 25 ... Non-volatile memory, 26 ... IO port, 27
... display controller, 28 ... operation panel, 29 ... display panel, 30 ... AV block, 31 ... interface,
40 ... Vehicle, 41 ... Security system interface, 42 ... Unlocking mechanism, 43 ... Door lock system interface, 44 ...
Unlocking mechanism

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Claims (8)

[Claims] 1. A portable information terminal configured to be portable by a user, the information transmitting / receiving unit receiving information from an in-vehicle device or transmitting information to the in-vehicle device, and the received information from the in-vehicle device. And a mutual authentication unit that performs a process for mutual authentication with the vehicle-mounted device based on the above. 2. An in-vehicle device used while mounted on a vehicle, the information transmitting / receiving unit receiving information from the outside or transmitting information to the outside, and based on the received information from the outside. A mutual authentication unit that performs processing for mutual authentication with a device that has transmitted information from the outside, and an operation permission unit that permits the operation of the in-vehicle device when mutual authentication is accepted by the mutual authentication unit. An in-vehicle device characterized by comprising: 3. The operation permission is provided when the vehicle-mounted device is further connected to a door lock system of a vehicle in which the vehicle-mounted device is mounted, and the vehicle-mounted device is connected to the door lock system via the connection unit. The vehicle-mounted device according to claim 2, wherein the unit permits unlocking of the door lock when the mutual authentication is approved by the mutual authentication unit. 4. The operation permission is provided when the vehicle-mounted device is further connected to a vehicle security system of the vehicle in which the vehicle-mounted device is mounted, and the vehicle-mounted device is connected to the vehicle security system via the connection unit. The vehicle-mounted device according to claim 2, wherein the unit permits the unlocking of the security mechanism when the mutual authentication is approved by the mutual authentication unit. 5. The in-vehicle device includes a storage unit that stores identification information unique to the in-vehicle device, and an input unit that inputs information for authenticating the identification information, and the operation permission unit includes the identification unit. The in-vehicle device according to claim 2, wherein when the information is input, the operation of the in-vehicle device is permitted. 6. A method for preventing the theft of an in-vehicle device, comprising a portable information terminal and an in-vehicle device capable of communicating with the portable information terminal, wherein mutual authentication is performed between the portable information terminal and the in-vehicle device. And a step (b) in which the in-vehicle device receives and permits the operation when the mutual authentication between the portable information terminal and the in-vehicle device is performed in the step (a). A method for preventing the theft of an in-vehicle device, comprising: 7. A program for controlling a portable information terminal as a computer device that permits the operation of an in-vehicle device, the process comprising receiving information from the in-vehicle device, and based on the received information from the in-vehicle device, A program for causing the portable information terminal to execute a process of performing mutual authentication with the in-vehicle device, and a process of permitting the operation of the in-vehicle device when the mutual authentication is accepted. 8. A program for controlling the operation of an in-vehicle device as a computer device, the process comprising receiving information from the outside, and transmitting the information from the outside based on the received information from the outside. A program for causing the in-vehicle device to execute a process for mutual authentication with a device and a process for permitting the operation of the in-vehicle device when the mutual authentication is accepted.