JPH04276849A - Device provided with code security function - Google Patents

Abstract

PURPOSE:To obtain a device having a master ID code and a code security function that cannot be easily released even if the master ID code is clarified. CONSTITUTION:In a device having a code security function equipped with a user ID code storage means 1 for storing a user ID code, a user ID code input means 2 for inputting a user ID code from the user, and a coincidence discriminating means 3 for deciding whether or not an input ID code coincides with a user ID code and outputs a security release signal if they coincide with each other, a master ID code memory means 4 is provided, wherein no user ID code cannot be input from the device including the user ID code input means 2, and the coincidence discriminating means 3 decides the coincidence between the master ID code input from a master ID code input means 5 and the stored master ID code, and outputs a security release signal only when they coincide with each other.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a device having a code security function, which has an anti-theft function by being operable only when a regular ID code is input, and particularly relates to a device having a code security function, which has an anti-theft function by being operable only when a regular ID code is input. The present invention relates to a device in which a common master ID code exists for devices provided so that code security can be canceled if a user forgets a different user ID code.

0002

[Prior Art] In AV equipment installed in automobiles, AV
Theft occurs when devices are removed from a vehicle and stolen. Therefore, if the battery is once removed from the car and then connected to the battery again, the specified I.
The device is not ready for operation unless the D code is entered. By displaying this information on the device or widely informing the public through advertisements, etc., the device is excluded from being subject to theft.

[0003] In order to realize such an anti-theft function, a microcomputer is provided in a device such as an AV device, and when the microcomputer is connected to a power source and a power-on reset is performed, an ID code is required to be input. However, the device is controlled so that it does not perform its original function until after the proper ID code is input. An example of the configuration of a device having a code security function using such a microcomputer is shown in FIG.

In FIG. 5, 7c is a microcomputer that controls the main body 8c. When this device is connected to the battery 9c, the microcomputer 7c performs an initial setting operation, and then the control panel 2c
The display section of the screen flashes to request input of the ID code. Then, the regular ID code stored in the ID code storage section 1c is compared with the input ID code, and if they match, the device can perform its original operation.

[0005] A different ID code is determined at the factory for each device, and the code is sometimes notified to the user, but when shipped, it is set to a default value of all zeros, so that the user can A format that can be set arbitrarily is widely used. In either case, the user must remember the ID code of the device. However, the ID code needs to be entered only when the device is removed from the vehicle and reinstalled, and this is not done frequently, so the user may forget the ID code and be unable to reactivate it even though he or she is an authorized user.

[0006] Therefore, in addition to the above-mentioned user ID code input by the user, a special ID code called a master ID code is prepared, and when this master ID code is input, all The code security of the device can be canceled. This master ID
Since the code is common to all devices, it is strictly managed and is used only when a user requests security release, after confirming that the user is an authorized user. Additionally, measures are being taken to increase the number of digits compared to the user ID code to make it more difficult to decipher. Master ID
The code is entered using the same input means used to enter the user ID code.

[0007]

[Problem to be solved by the invention] As mentioned above, the master I
D-codes are strictly controlled and various measures are taken to make them difficult to decipher. However, if this master ID code is known to a third party, all the devices can be easily unlocked, causing a big problem. In particular, the master ID code is just a code, and even if it is stolen, it is difficult to discover that it has been stolen, and there is also the problem that effective countermeasures cannot be taken.

The present invention has been made in view of the above-mentioned problems, and it is more difficult to decipher the code security function having the master ID code, and even if the master ID code is stolen, the security cannot be easily deactivated. It is an object of the present invention to realize a device having a code security function that makes it easy to discover that an ID code has been stolen.

[0009]

[Means for Solving the Problems] In order to solve the above-mentioned problems, the device having the code security function of the present invention uses an input means different from the input means for inputting the user ID code to input the master ID code. Moreover, this master ID code input means is not attached to the device used by the user. FIG. 1 is a diagram showing the basic configuration of a device having a code security function according to the present invention. In each figure, parts having the same functions are designated by the same numbers, and each figure except FIG. 1 is represented by a lowercase alphabetic letter.

[0010] That is, the device having the code security function of the present invention has a user ID code that stores a user ID code.
D-code storage means 1, user ID code input means 2 through which the user inputs the user ID code, and whether the user ID code input by the user and the user ID code stored in the user ID code storage means 1 match. In a device having a code security function, which includes a code security function that includes a match determination means 3 that outputs a security release signal that makes the device operable only when there is a match, the user ID code input means 2 is commonly used in the device. The device is equipped with a master ID code storage means 4 for storing a master ID code that cannot be input from a device that can be used by a person, and the match determination means 3 is inputted via a master ID code input means 5 that can be used only by an administrator of the master ID code. The code security system is characterized in that it is determined whether or not the master ID code inputted by the master ID code matches the master ID code stored in the master ID code storage means 4, and if they match, a security release signal is output. It is a device with functions.

[0011]

[Operation] The master ID code can only be input from the master ID code input means 5, and this master ID code input means 5 is strictly managed so that it is used only by the administrator of the master ID code. Therefore, even if the master ID
Even if the code is known, the security cannot be canceled unless this master ID code input means is obtained.

[0012] In this way, not only the master ID code but also
The master ID code input means 5 is also managed and kept confidential, resulting in a double security function. Moreover, the master ID code input means 5 is in the form of a device,
It is easier to manage than a master ID code in code format, and even if it is stolen, it can be discovered immediately and countermeasures can be taken easily.

Furthermore, without the master ID code input means 5, the master ID code itself cannot be input, and therefore the master ID code cannot be easily decoded.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a device having a code security function according to the present invention is implemented using a microcomputer in the same manner as the device shown in FIG. In FIG. 5, a control panel 2c of this device is connected to the main body portion via a cable or a connector, and a microcomputer 7c reads input from the control panel 2c. In the first embodiment, the control panel 2c
is changed depending on the state in which the user uses it and the state in which the master ID code is input. An example of this is shown in FIG.

FIG. 2A shows a control panel when a user uses this device, which is an audio device in this case. The user uses this control panel 2a
In addition to normal operations such as selecting an audio signal source by operating the button, an ID code is input when the audio device is installed in a car and connected to a battery. As shown in FIG. 2(a), numbers from 0 to 9 can be input from this control panel 2a.

Next, the administrator of the master ID code
When inputting the D code, a master ID code input panel 5a as shown in FIG. 2(b) is used by connecting it to the connector after removing the user control panel 2a. As shown in FIG. 2, the number input keys on the user control panel 2a are from 0 to 9, but the only number that can be input on the master code input panel 5a is hexadecimal 0.
to F. Originally, microcomputers were compatible with hexadecimal numbers, and in order to support decimal numbers suitable for human use, a user control panel 2a as shown in Figure 2(a) is used. The number of signal lines remains the same in the master ID input panel 5a. Therefore, all you have to do is change the panel to which it is connected.

From the user control panel 2a,
Since hexadecimal numbers A to F cannot be input, if these are included in the master ID code, the user will not be able to input the master ID code. FIG. 3 shows an example of the operation for identifying the ID code of a microcomputer in a device having such a master ID code and a user ID code. When this device is connected to a battery, the microcomputer starts operating and performs a predetermined initial operation in step 101. Next, in step 102, a request is made to input an ID code, such as by flashing the display. step
In step 103, it is determined whether an ID code has been input. ID
If no code is input, step 102 is repeated. If an ID code is input, it is read in step 104. Next, in step 105, the master ID code is read, and in step 106, it is determined whether the input code and this master ID code match. If they match, you are the administrator of the master ID code, so you can display the user ID code in response to the administrator's request, etc.
Enter the master operation, which is only allowed to the code administrator.

If the input code and master ID code do not match, the user ID code is read in step 107, and the input code and the user ID code are read in step 108.
Determine whether the D codes match. If they do not match, it means that the owner is not an authorized owner, and the process returns to step 102 to request input of an authorized ID code. If they match, the owner is the authorized owner, so security is canceled in step 109 to enable normal operation.

As described above, in the first embodiment, by simply changing the control panel for user and master ID input, numbers in the same format are input from the same connector, and only the range of numbers that can be input is changed. . However, we also arbitrarily changed the number correspondence between the user and master ID code inputs, so that 3 for the user corresponds to 7 for the master ID code input, 4 corresponds to 1, and so on. It is also possible to use a master ID code input panel with different correspondence relationships. In this case, the master ID code input panel functions as a kind of decryptor.

Next, a second embodiment is shown in FIG. 4, which uses a device for inputting a master ID code that is completely different from the input means for inputting a user ID code. This is a device 6b having a code security function provided with a window 13b that allows only a specific wavelength to pass through, and an optical signal corresponding to a master ID code inputted through the window is decoded and determined. In the figure, 5b is a device for inputting a master ID code, and the code manually input to this master ID code input device is converted from parallel to serial and output as a serial optical signal from the LED 12b. The window 13b is a bandpass filter that allows only the wavelength of the LED 12b to pass through, and the passed optical signal is received by the phototransistor 14b and converted into an electrical signal. This electrical signal is digitized by a comparator 15b, and converted into a code corresponding to the master ID code by a serial-parallel converter 16b. The rest is the same as the first embodiment.

In the second embodiment, it is necessary to newly provide a part as shown in FIG. 4, but it is difficult to create such a master ID code input device, and even if the master ID code is known, it is difficult to input it. I can't. Furthermore, in consideration of the possibility that this master ID code input device may be stolen, the master ID code is managed separately and is input to this master ID code input device.

[0022]

According to the present invention, in a device having a code security function in which a master ID code exists, it is possible to realize a device in which the security cannot be easily released even if the master ID code is known.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the basic configuration of a device having a code security function according to the present invention.

FIG. 2 is a diagram of a user control panel and a master ID code input panel in an embodiment in which the number of inputs that can be entered on the master ID code input panel is expanded from 10 to 16 types.

FIG. 3 is a flowchart showing an example of the operation of a microcomputer when it has a master ID code and a user ID code.

FIG. 4 is a diagram showing an embodiment in which optical means are specially provided for inputting a master ID code.

FIG. 5 is a diagram showing a configuration example of a device that implements a code security function using a microcomputer.

[Explanation of symbols]

1...User ID code storage means 2...User ID code input means 3... Matching determination means 4...Master ID code storage means 5...Master ID code input means

Claims (1)

[Claims] [Claim 1] User I storing a user ID code
D code storage means (1), user ID code input means (2) for the user to input a user ID code, and user ID code input by the user and the user stored in the user ID code storage means (1). In a device having a code security function, which includes a match determination means (3) that determines whether the ID code matches the ID code and outputs a security release signal that enables the device to operate only when the code matches, , the user ID code input means (
2), the matching determining means (3) includes a master ID code storage means (4) for storing a master ID code that cannot be input from a device that is ready for use by a user, and the matching determining means (3) includes:
Master I that can only be used by the administrator of the master ID code
Master ID input via D code input means (5)
Determining whether the code matches the master ID code stored in the master ID code storage means (4);
A device having a code security function, which outputs a security release signal when the code matches.