JP3585093B2 - Security equipment for in-vehicle electrical products - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a security device incorporated into electrical products of the car audio or the like to be mounted on an automobile.
[0002]
[Prior art]
2. Description of the Related Art In a car audio system mounted in a car in Europe and the United States, a security device is built in to cope with theft. In the security device, a security code or security data as data obtained by encrypting the security code is recorded in a predetermined non-volatile memory, and the user writes a security code (the security code is usually several digits) at the time of purchasing the car audio. You will receive a piece of paper. When the car audio is attached to the car and connected to a battery and power is supplied to the car audio, the car audio enters a state of receiving a security code input from a user, and the security data registered in the nonvolatile memory is received. When the security code corresponding to is input, the car audio can be used. After that, even if the car's engine key is turned off, the car audio is still supplied with power from the car's battery, so unless the battery goes out or the car audio is replaced with another car, security is not changed. Entering the code is avoided.
[0003]
Also, for example, if an incorrect security code is input in the initial security code reception state, then it becomes difficult to input the security code for a predetermined time, and after a predetermined time, the security code input reception state is set again. Therefore, if an incorrect security code is input, the next input reception state is set to be after a predetermined time longer than the previous predetermined time, that is, the interval of the standby predetermined time until the input reception state is gradually extended. Like that. This prevents the thief from entering the security code by trial and error and accidentally finding the security code. Even if an incorrect security code is entered and the security code reception is terminated, the supply of battery power to the car audio is cut off, and when the power is supplied again, the system enters the first security code reception state. Reconnection is complicated.
[0004]
[Problems to be solved by the invention]
Conventionally, in the factory for the manufacture of electrical products such as car audio, after each electrical product is assembled, various adjustments and operation checks are performed, serial numbers are assigned to those that pass the inspection, and non-volatile memory is used using equipment. Wrote the security code in the box, and then shipped it. Thus, the registration of the security data has been performed in the final step of the manufacturing line. In order to ensure various adjustments and operation day recognition, security is not applied unless security data is registered. Therefore, when a user is stolen in the market, the stolen product can be used by replacing the memory storing the security data of the stolen product with the memory in which the security data is erased. As a countermeasure, it was considered that the security data could not be used unless it was registered.
[0005]
However, in this case, it is necessary to register security data in a process before the various adjustments and operation confirmation processes so that various adjustments and operation confirmations can be performed in the operation state of the apparatus. On the other hand, since the security data to be written to the nonvolatile memory must be different for each serial number, if security data is to be written to the nonvolatile memory immediately after assembling the car audio before various adjustments and operation confirmation, In various subsequent adjustments and operation confirmation steps, the worker must input a different security code for each car audio one by one before starting the work, which significantly reduces the work efficiency. That is, in each process of the adjustment and operation day recognition, each time the power supply line is cut off or connected, it becomes necessary for the operator to input a different security code for each device before starting work, thereby reducing work efficiency. Will be.
[0006]
As described above, securing the use of car audio for the non-volatile memory in which security data is not registered has a problem in security, but the security code is not registered in the non-volatile memory at the end of security data. There was a demand that the car audio could be operated temporarily without input or input.
[0007]
The present invention has been made in view of the above problems in the prior art, while ensuring security, and its object is to provide a vehicle-mounted electric product for a security device that can improve the production efficiency of electronic products.
[0008]
[Means for Solving the Problems]
The security device for an electric product of the present invention is incorporated in the electric product, and if the security data stored in the stored security data matches the security code fetched from the outside, the electric device can be used. When the security data is not registered in the security device, the security device determines a predetermined time from a change point in time of the electrical state (hereinafter, referred to as the “change point of the electrical state”) that leads to the start of the operation of the electrical product. After the time elapses, the operation of the electric appliance is prohibited.
[0009]
The "matching relationship" in "If there is a matching relationship between stored security data and a security code imported from the outside" includes not only matching in the same case, but also corresponds to matching It shall also include the attached relationships. That is, the security data includes not only the security code itself, but also the encrypted security code. Therefore, when the encryption of the security code fetched from the outside matches the stored security data, the electronic product is put into a usable state. The electrical product is, for example, a car radio such as a car radio or a CD or tape player which is mounted on a car and receives supply of DC power from a battery of the car. The "predetermined time" of "after a predetermined time has elapsed since the change of the electrical state" is, for example, a time required for adjustment after assembly of the electric product, operation confirmation, etc. in an electric product manufacturing factory, for example, about 30 minutes. It is. The "function to prohibit the operation of electric appliances" refers to the forcible turning off of the operation power of electric appliances, the inability to operate one or more specified electric appliances, and the reduction of volume in car audio, etc. This includes everything that makes practical use difficult, such as fixing to the maximum volume.
[0010]
The “time point of change of the electric state” includes, for example, each time point of connection of a backup wire to the electric product, start of power supply to the electric product, turning on of an ignition power supply, or turning on a power switch of the electric product. Regarding the connection of the backup wire to the electrical product, it is noted that the usual automotive electrical product is connected to the ignition switch to turn on and off the power supply by turning on and off the ignition switch. A total of three wires, the wires and the wires connected to the battery to ensure backup power, are connected. Therefore, when stealing the electric product from the car, it is necessary to remove these three wires at the source of the steal, and to connect the backup product to the electric product at the installation destination. As a backup wire is connected to the electrical product, backup power is supplied to the electrical product.
[0011]
In this way, the use of the electronic device with the built-in security device in the security data unregistered state for a predetermined period of time is ensured, whereby various adjustments and operation confirmation work in the electronic product manufacturing factory are ensured, and After the shipment of the product, even if the electrical product is stolen and the thief replaces the security data holding memory of the electrical product with the memory whose security data is erased, the electrical product can only be used for a predetermined time Therefore, theft value can be lost and theft can be prevented.
[0012]
Note that registration of security data to the security device for electrical products is usually performed in the last step of the manufacturing line, and the security data for the electrical product is registered in the security device while the security data selected for each serial number is registered in the security device. Will be shipped.
[0013]
The security device for electric appliances of the present invention is incorporated in electric appliances. Further, the method further includes the following (a) to (d).
(A) a security data nonvolatile memory in which security data is recorded; (b) security data registration detection means for detecting whether security data has been registered or not registered in the security data nonvolatile memory; Measuring means for measuring the lapse of a predetermined time; (d) when the security data registration detecting means detects that the security data has not been registered, the electric product can be operated only within a predetermined time from the start of power supply to the electric product, and thereafter operated Unregistered operation control means to be disabled
The newly installed nonvolatile memory for security data usually has (i) an FF (two hexadecimal digits, a total of 8 bits) written in all addresses, and (ii) a random numerical value written in all addresses. There are two types. Further, when the security data is registered in the newly installed security data nonvolatile memory, the security data and the reference data as another data related to the security data are respectively stored in predetermined addresses of the security nonvolatile memory. Written. The reference data is data associated with the security data based on a predetermined rule, and indicates a function of the security data or its encryption. For example, the result of adding a predetermined number to the security data or the two's complement of the security data can be selected as the reference data. As an actual example, when security data is given by hexadecimal two-digit "AB" and "37" is added to generate reference data, the reference data becomes "64". In this case, in the case (i), the security data and the reference data to be read out are both “FF”, so that even if they are matched, they do not satisfy the predetermined correspondence, so that the security nonvolatile memory has no security. It can be determined that the data has not been registered. In the case (ii), even if the security data read from the nonvolatile memory and the reference data are matched, the probability that the predetermined correspondence is accidentally satisfied is extremely low. The predetermined relationship is not satisfied, and it can be determined that the security data has not been registered in the security memory.
[0015]
In this way, when the security data is not registered in the security data nonvolatile memory, the electric product is operated for a predetermined time from the time of the change of the electric state, for example, from the start of power supply to the electric product, and within this time, the electric product is operated. If you make adjustments and check the operation before shipping the product, you can save the trouble of entering each security code. Also, even if the electronic product is stolen after shipment and the thief replaces the non-volatile memory for security data with another memory (without security data registration), the electronic product can be operated only for the first predetermined time, After the elapse of the predetermined time, the electrical product becomes inoperable, so that security of the electrical product can be ensured.
[0016]
According to the security device for an electric product of the present invention, the nonvolatile memory also records the reference data as data having a predetermined relationship with the security data, and the security data has been registered or unregistered by the security data registration detecting means. The registration is detected by checking whether there is a predetermined relationship between the security data recorded in the nonvolatile memory and the reference data.
[0017]
The security device for an electric product of the present invention further comprises: (e) when security data to be recorded in the security data nonvolatile memory is registered during a period in which the unregistered operation control means enables the operation of the electric product, A processing shift unit that shifts to the same process as when the security data registration detection unit detects that the security data has been registered is included.
[0018]
The security device for electric appliances of the present invention is incorporated in electric appliances. Further, the method further includes the following (a) to (d).
(A) a non-volatile memory for storing security data and reference data as data having a predetermined relation with the security data; and (b) if there is no predetermined relation between the security data read from the non-volatile memory and the reference data. Determining means for determining whether security data has not been registered or whether the security data nonvolatile memory is absent, and (c) measuring means for measuring the lapse of the predetermined time from the point of time when the electrical state changes. d) If the judging means judges that the security data is either unregistered or non-existent of the security data nonvolatile memory, the electronic product is made operable within a predetermined time from the time of the change of the electric state. Unregistered operation control means to disable operation thereafter
According to this electronic device security device, the security data recorded in the security non-volatile memory and the reference data are compared with each other to determine whether or not the security data is registered. Therefore, even when the security data memory is removed, As in the case where security data is not registered, the operation of the electrical product after a predetermined time can be disabled. Therefore, this security device can also ensure security when the security data memory is removed.
[0020]
As described above, as a method for detecting whether or not the security data nonvolatile memory is removed (= not present), (i) the security data matches the reference data with each other and a predetermined value is set between these data. In addition to the detection based on whether or not there is a relationship, for example, there are the following (ii) and (iii). That is, (ii) the security data nonvolatile memory is not only for recording security data, but also can record other data together, and has a read / write address in addition to the security data address. Therefore, it is tried to write data to an address other than the address of the security data, and if writing is not possible, it is detected that the security data nonvolatile memory has been removed. (Iii) Usually, a pull-up resistor is provided at the read port of the CPU for the security data nonvolatile memory. Therefore, even if the security data nonvolatile memory is not mounted, the address of the security data in the security data nonvolatile memory. Is read, for example, FF (hexadecimal, 2 digits; total 8 bits) is read. Therefore, if the read security data is FF, it is detected that the security data nonvolatile memory has been removed. The detection method of (ii) and (iii) is adopted in place of (i), and it is possible to cope with removal or destruction of the security data nonvolatile memory.
[0021]
(E) When security data is registered during a period in which the unregistered operation control unit enables the electronic product, the determining unit determines whether the nonvolatile memory exists and the non- And means for shifting to the same processing as when it is determined that the security data has already been registered.
[0022]
At an electrical product manufacturing factory, after completing a finished product test before shipping the product, a serial number is assigned to the electrical product, and at the same time, security data is recorded in a nonvolatile memory for security data using a predetermined device. . Therefore, when the security data is registered after the end of the test of the electric product in the production factory, the security is immediately applied, and the security code confirmation test and the like can be continued and efficiently performed.
[0023]
The security data storage memory presence / absence detecting device of the present invention associates security data for checking a matching relationship with a security code fetched from outside with reference data as data having a predetermined relationship with the security data. The writing means for writing to the nonvolatile security data storage memory, and the security data and reference data read from the security data storage memory are checked for a predetermined relationship, and if there is no predetermined relationship, the security data storage memory is removed. There is a predetermined relationship investigating means for judging.
[0024]
As described above, the read port on the CPU side for the nonvolatile security data storage memory (hereinafter referred to as the security data nonvolatile memory in the above description, and henceforth referred to as the security data nonvolatile memory) is normally provided. Since the pull-up resistor exists, even if the security data nonvolatile memory is not mounted, if the security data address in the security data nonvolatile memory is read, for example, FF (2 hexadecimal digits, total 8 bits) is read. It is. Therefore, it is impossible to detect the removal of the security data nonvolatile memory from the inability to read the security data from the security data nonvolatile memory. However, if the security data storage memory is removed, the security data and the reference data read from the security data nonvolatile memory do not have a predetermined relationship. Can be detected when the security data storage memory is removed from the storage device. Even if the security data non-volatile memory has not been extracted, if the security data has not been registered, etc., there is no predetermined relationship between the two read data, but even in such a case, the security data non-volatile memory When the same processing is performed as when the security data storage memory is detected, there is no problem in using the security data storage memory presence / absence detection device.
[0025]
In the security method for an electric product according to the present invention, if the stored security data matches the security code fetched from the outside, the electric product can be used. Then, when the security data is not registered in the security memory, the method includes a step of prohibiting the operation of the electric product after a predetermined time has elapsed from a time point of a change in an electric state leading to the start of operation of the electric product.
[0026]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a flowchart of a main part of a car audio security routine. In S10, it is determined whether or not DC power from a battery or the like has been turned on to the car audio. If the determination is YES, the process proceeds to S11, and if NO, the routine ends. In S11, the presence or absence of a security data nonvolatile memory for recording security data is detected. If there is, the process proceeds to S12, and if not, the process proceeds to S16. The non-volatile memory for recording security data is used not only for security data but also for storing other data, for example, the last broadcast station received during the last use of car audio, and the data can be read and written to multiple addresses. It has become. Regarding the presence or absence of the security nonvolatile memory, for example, the data of the security data address and the reference data address of the memory are read, and these data are compared to determine whether or not these data have a predetermined correspondence with each other. If not, the memory has been removed; that is, it can be determined that it does not exist. Or, in the security data nonvolatile memory, write arbitrary data to a readable / writable address other than the security data address, and if writing is not possible, the security data nonvolatile memory is removed, that is, it is not present. Can be determined. In S12, it is determined whether the security data is already registered or unregistered in the security data nonvolatile memory. If the security data is already registered, the process proceeds to S17, and if not, the process proceeds to S13. The newly installed nonvolatile memory for security data usually has (i) FF (hexadecimal 2 digits; total 8 bits) written in all addresses and (ii) random address written in all addresses. There are two types. Further, when the security data is registered in the newly mounted security data nonvolatile memory, reference data as another data related to the security data is written together with the security data. In the cases (i) and (ii), the security data and the reference data are both read out, and when these data are compared, if it is determined that there is no predetermined corresponding leap engagement, the security nonvolatile memory is stored in the nonvolatile memory for security. Can determine that the security data has not been registered. The data recorded as security data in the non-volatile memory for security data is usually not the security code itself but an encrypted version of the security code, and the thief of the car audio has succeeded in reading this data. However, it cannot be used as a security code input by a user.
[0027]
In S13, the timer is started to operate and the elapsed time is measured. In S14, it is determined whether or not security data has been registered. If the determination is YES, the process proceeds to S17, and if NO, the process proceeds to S15. In S15, it is determined whether 30 minutes have elapsed from the value measured by the timer. If the determination is YES, the process proceeds to S16, and if NO, the process returns to S14. This 30 minutes is defined as the time required for car audio adjustment and operation tests in a car audio production factory. Therefore, in the car audio production factory, the adjustment and the operation test of the car audio are completed within this 30. In S16, the car audio is disabled. Measures to disable the car audio include not only forcibly turning off the car audio, but also disabling certain functions of the car audio, maximizing the volume of the car audio, and adjusting the volume. This includes making it impossible. In S17, the routine at the time of registration of the security code is executed. In the routine at the time of registering the security code, for example, the user is prompted to input a security code, and if an incorrect security code is input once or continuously a plurality of predetermined times, the operation of the car audio is stopped for a predetermined time. Process.
[0028]
In this way, the car audio production factory can adjust the car audio and check the operation without the trouble of inputting a different security code for each car audio. In the case of stolen car audio, if the non-volatile memory in the product is removed or replaced with another memory by the thief, only 30 minutes can be used from the start of turning on the power to the car audio, and the theft value is reduced. Can be almost lost.
[Brief description of the drawings]
FIG. 1 is a flowchart of a main part of a car audio security routine.

Claims (5)

In security devices for in- vehicle electrical products,
(A) a security data nonvolatile memory in which security data is recorded;
(B) security data registration detection means for detecting whether security data has been registered or not registered in the security data nonvolatile memory;
(C) vehicle when changing electrical electrical state leading to start operation of the product (hereinafter, referred to as "electrical state change point".) The predetermined measurement means to measure the time elapsed from,
; (D) if the security data registration detecting means detects the unregistered security data, when unregistered that in the predetermined time from the electrical state change point then operable the vehicle electrical product is inoperable Operation control means, and
(E) when the security data registration detecting means detects that the security data has been registered, an executing means for executing a routine at the time of security code registration,
Security device for in- vehicle electrical products including. In security devices for in- vehicle electrical products,
(A) a nonvolatile memory for storing security data and reference data as data having a predetermined relationship with the security data;
(B) if there is no predetermined relationship between the security data read from the nonvolatile memory and the reference data, one of the security data is unregistered or the security data nonvolatile memory is not present Determination means for determining that
(C) vehicle when changing electrical electrical state leading to start operation of the product (hereinafter, referred to as "electrical state change point".) The predetermined measurement means to measure the time elapsed from,
In (d) If the determination unit determines that it is one of the absence of non-volatile memory for unregistered and security data of the security data, the vehicle electrical product within a predetermined time from the electrical state change time point Unregistered operation control means that is operable and then inoperable, and
(E) when the determining means determines that the non-volatile memory exists and the security data is already registered therein, an executing means for executing a routine at the time of security code registration,
Security device for in- vehicle electrical products including. (F) when the security data is registered during a period in which the unregistered operation control unit enables the in- vehicle electrical product, a shift unit that shifts to a routine when the security code is already registered ;
The security device for an in-vehicle electric product according to claim 1 , comprising: The routine at the time of registration of the security code prompts the input of the security code, and performs a process of stopping the operation of the car audio for a predetermined time if an incorrect security code is input once or continuously a plurality of predetermined times. The security device for an in-vehicle electric product according to any one of claims 1 to 3. Electric and vapor state change time, vehicle electrical products for security device according to any one of claims 1 to 4 including the operation start time of the vehicle electrical products with the power supply to the vehicle electrical products.

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