JPH11312283A - Security device for electrical appliance and detecting device and method for sensing presence of security data storing memory - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure security and also to improve the production efficiency of electrical appliances by inhibiting the operation of the electrical appliance, when a prescribed time is elapses from the time of the electrical state related to the start of the operation of the electrical appliance, when the security data have not been registered yet. SOLUTION: When security data have not been registered yet, the operation of an electrical appliance is stopped, when a prescribed time is elapsed from a changing time of the electric state connected to the start of operation of the electrical appliance. That is, if it is decided in a step S12 that the security data have not been registered yet in a nonvolatile memory used for the security data, a timer is started to count the time which elapsed in a step S13. In a step S14, it is decided whether or not the security data have been registered. If the security data have not been registered, it is decided in a step S15 whether 30 minutes have elapsed, based on the count value of the timer. If 30 minutes have elapsed, the operation of a car audio equipment is made unavailable in a step S16. In this case, the adjustment and an operational test for the car audio equipment are made to be completed in 30 minutes at a factory.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a security device, a security data storage memory presence / absence detection device, and a security method incorporated in an electric product such as a car audio mounted on an automobile.

[0002]

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 same time as purchasing the car audio. To receive a piece of paper. Then, when the car audio is attached to the car, connected to a battery, and power is applied 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.

Further, 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 input of the security code is received again. State, and 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 increased. To be stretched. This prevents the thief from entering the security code by trial and error and accidentally finding the security code. In addition,
If you enter the wrong security code and enter the security code reception end state, if you cut off the battery power supply to the car audio and supply it again, the system will return to the first security code reception state, but disconnect and reconnect. The connection becomes complicated.

[0004]

Conventionally, in a factory for manufacturing electrical products such as car audio, after assembling each electrical product, various adjustments and operation checks are performed, and a serial number is assigned to a product that has passed the inspection. At the same time, the security code was written into the non-volatile memory using an instrument, and then shipped. in this way,
Registration of security data was performed at the last step of the production line. In order to secure various adjustments and operation day recognition, security is not applied unless security data is registered. Therefore, when a user is stolen in the market, by replacing the memory that stores the security data of the Shinagi product with the memory that has the security data erased,
A stolen product was available. As a countermeasure,
If security data was not registered, it would be considered impossible to use it.

However, in this case, it is necessary to register security data before the various adjustment and operation confirmation steps so that various adjustments and operation confirmations can be performed while the apparatus is operating. 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, before starting work, it is necessary for an operator to input a different security code for each car audio one by one, which significantly lowers work efficiency. That is, in each process of the adjustment and operation day recognition, each time the power 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 lowering work efficiency. Will be.

As described above, securing the use of the car audio for the non-registered nonvolatile memory of security data has a problem in security, but the security of the non-volatile memory at the end of security data is not secure. There was a demand that the car audio could be operated temporarily without registering or entering codes.

[0007] The present invention has been made in view of the above-mentioned problems in the prior art. SUMMARY OF THE INVENTION It is an object of the present invention to provide a security device for an electrical product, a security data storage memory presence / absence detection device, and a security method that can improve the efficiency of manufacturing an electrical product while ensuring security.

[0008]

The security device for electric appliances of the present invention is built in the electric appliance, and uses the electric appliance if there is a correspondence between the security data stored in the security code fetched from the outside and the stored security data. Make it possible. When the security data is not registered in the security device, the security device:
It functions so as to prohibit the operation of the electric appliance after a predetermined time has elapsed from a change point of the electric state linked to the start of the operation of the electric appliance (hereinafter referred to as “the electric state change point”).

The "matching relationship" of "if the stored security data has a matching relationship with the security code fetched from the outside" includes not only matching in the same case but also matching. It also includes the relationship associated as a thing. In other words, security data includes not only the security code itself,
Include the encrypted version of the 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 electric 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, about 30 minutes, which is a time required for adjustment after assembly of the electric product, confirmation of operation, etc. in an electric product manufacturing factory. It is. The "function to prohibit the operation of electrical products" refers to forcibly turning off the operation power supply of electrical products, disabling one or more specific operations of electrical products, and controlling the volume of 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" means, for example, each time point such as connection of a backup wire to the electric product, start of power supply to the electric product, turning on of the ignition power supply, or turning on the power switch of the electric product. including. Regarding the connection of backup wires to electrical products,
A typical automotive electrical product is connected to a ground wire, a wire connected to an ignition switch to turn on / off the power supply by turning on / off an ignition switch, and a battery connected to secure backup power. A total of three wires 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 for a predetermined period of time in a state where security data is not registered is ensured, thereby ensuring various adjustments and operation confirmation work in an electric product manufacturing factory. After the shipment of the electrical 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 has been erased, the electrical product remains for a predetermined period of time. Only the use is possible, so that theft value is lost and theft can be prevented.

The registration of security data in the security device for electric appliances is usually performed in the last step of the production line, and the security data selected for each serial number is registered in the security device.
Security devices for electrical products are shipped.

[0013] The electronic device security device of the present invention is incorporated in an electronic product. Then, 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 elapse of a predetermined time (d) When the security data registration detecting means detects that security data has not been registered, the electronic 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 disable

The newly installed non-volatile memory for security data is usually (i) one in which FF (hexadecimal two digits; total 8 bits) is written in all addresses;
i) There are two types: a random number is written in all addresses. Further, when the security data is registered in the newly installed security data nonvolatile memory, the security data and 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 two digits of hexadecimal “AB” and reference data is generated by adding “37” thereto, the reference data becomes “64”. In this case, in the case (i), both the security data and the reference data read out are “FF”.
Therefore, even if these are compared, the predetermined correspondence is not satisfied, and it can be determined that the security data is not registered in the security nonvolatile memory. Further, 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 will not be satisfied, and the security memory
It can be determined that the security data has not been registered.

Thus, 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 the power supply to the electric product. If the adjustment and the operation check before the shipment of the electric product are performed, the trouble of inputting the security code one by one can be omitted. Also,
After shipment, even if the electrical product is stolen and the thief replaces the non-volatile memory for security data with another memory (with no security data registered), the electrical appliance can be operated only for the first predetermined time, but the predetermined time After that,
Since the electrical product becomes inoperable, security of the electrical product can be ensured.

According to the security apparatus for electric appliances of the present invention, the nonvolatile memory also records the reference data as data having a predetermined relationship with the security data, and stores the security data by the security data registration detecting means. The detection of registration or non-registration is performed by checking whether there is a predetermined relationship between the security data recorded in the nonvolatile memory and the reference data.

In the security device for an electric product of the present invention, (e) the security data to be recorded in the non-volatile memory for security data is registered during a period in which the unregistered operation control means enables the operation of the electric product. When the security data registration detecting unit detects that the security data has been registered, the processing unit shifts to the same process as when the security data registration detecting unit detects that the security data has been registered.

The security device for electric appliances of the present invention is built in the electric appliance. Then, the following (a) to
(D). (A) Non-volatile 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 non-volatile memory and the reference data. ,
Judgment means for judging whether security data is unregistered or non-existence of security data non-volatile memory. (C) Measuring means for measuring elapse of the predetermined time from the point of time when the electric state changes. If the judging means judges that the security data has not been registered or the security data non-volatile memory is absent, the electric product can be operated within a predetermined time from the point of time when the electric state changes, and Is an unregistered operation control unit that is disabled

According to this security apparatus for electronic products, the security data recorded in the nonvolatile memory for security and the reference data are compared with each other to determine whether or not security data has been registered. Therefore, the memory for security data is removed. Also, when the security data is not registered, the operation of the electrical product after a predetermined time can be disabled as in the case where the security data is not registered. Therefore, in this security device, security when the security data memory is removed can also be ensured.

As described above, the method of detecting whether the security data nonvolatile memory is removed (= not present) is as follows: (i) the security data matches the reference data with each other and There is, for example, the following (ii) and (iii) besides detecting from whether or not there is a predetermined relationship between them. That is, (ii) the security data non-volatile memory is designed not only for recording security data but also for recording other data, and has a readable / writable address in addition to the security data address. Therefore,
An attempt is made to write data to an address other than the security data address, 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 CPU read port 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 (2 hexadecimal 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 the removal or destruction of the security data nonvolatile memory.

In the security apparatus for electric products of the present invention, (e) when security data is registered during a period in which the unregistered operation control means makes the electric product operable, the judgment means has a nonvolatile memory. And a shift means for shifting to the same processing as when it is determined that the security data has already been registered therein.

At the factory for manufacturing electrical products, after completing the finished product test before shipping the products, the serial number is assigned to the electrical products, and at the same time, the security data is stored in the non-volatile memory for security data by using a predetermined device. Record Therefore, when security data is registered after the test of the electrical product in the manufacturing factory, security is immediately applied, and a security code confirmation test and the like can be performed continuously and efficiently.

A security data storage memory presence / absence detecting device according to the present invention includes: security data for checking a matching relationship with a security code fetched from outside; and reference data as data having a predetermined relationship with the security data. Writing means for writing the security data in the nonvolatile security data storage memory in association with the security data storage memory read out from the security data storage memory, and checking if there is a predetermined relationship, and if there is no predetermined relationship, the security data storage memory is extracted It has a predetermined relation investigation means for judging that it has been performed.

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, so called the security data nonvolatile memory). Usually, since a pull-up resistor exists, even if the security data nonvolatile memory is not mounted, if the address of the security data in the security data nonvolatile memory is read, for example, F
F (2 hexadecimal digits, 8 bits in total) is read. 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 as 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 server. Even if the security data non-volatile memory has not been extracted, if the security data has not been registered in the non-volatile memory, the read data does not have a predetermined relationship. When the same process 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.

According to the security method for electric products of the present invention, if there is a correspondence between the security data stored from the outside and the security code stored therein, the electric products 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 that leads to the start of operation of the electric product.

[0026]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a flowchart of a main part of a car audio security routine. S
In 10, it is determined whether or not DC power from a battery or the like is turned on to the car audio, and if the determination is YES,
Proceeding to S11, if NO, end this routine.
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 previous use of car audio. 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 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. Alternatively, in the security data nonvolatile memory, any data is written 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, Can be determined.
In S12, it is determined whether the security data is registered or unregistered in the security data nonvolatile memory. If the security data is registered, the process proceeds to S17.
Proceed to S13. The newly installed nonvolatile memory for security data usually has (i) FF (16
2 digits in hexadecimal. (Total 8 bits) and (i
i) A random address is written in all addresses. Further, when the security data is registered in the newly installed security data nonvolatile memory, reference data as another data related to the security data is written together with the security data. In the case of (i) and (ii),
Both read security data and reference data,
When these data are compared, if it is determined that there is no predetermined leap engagement, it can be determined that security data has not been registered in the security nonvolatile memory. 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.

In step S13, the timer is started and the elapsed time is measured. In S14, it is determined whether or not security data has been registered.
Proceed to 17; if NO, proceed to S15. In S15, it is determined whether or not 30 minutes have elapsed from the measured value of 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 test at 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. S1
At 6, 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 registering the security code is executed. In the routine when the security code has already been registered, 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.

In this way, in a car audio production factory, adjustment of the car audio and operation confirmation can be performed without the trouble of inputting a different security code for each car audio. In addition, 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. 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 (9)

[Claims] 1. An electronic product security device incorporated in an electronic product, wherein when the stored security data matches a security code fetched from the outside, the electronic product is in a usable state. 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 is linked to the start of operation of the electrical product. An electronic product security device that functions to prohibit operation of the electronic product after a lapse of time. 2. The security device for an electric product according to claim 1, wherein (a) a nonvolatile memory for security data in which security data is recorded, and (b) registered or unregistered security data in the nonvolatile memory for security data. Security data registration detecting means for detecting registration; (c) measuring means for measuring a lapse of the predetermined time from the time of the change of the electrical state; and (d) the security data registration detecting means detects that security data has not been registered. In such a case, an unregistered operation control unit includes an unregistered operation control unit that makes the electric product operable within the predetermined time from the time of the change of the electric state and thereafter makes it inoperable. 3. The security device for an electric product according to claim 2, wherein the nonvolatile memory is also configured to record reference data as data having a predetermined relationship with the security data, and the security data registration detection is performed. The detection of whether security data has been registered or not registered by the means is performed by checking whether or not there is a predetermined relationship between the security data recorded in the nonvolatile memory and the reference data. 4. The electronic device security device according to claim 2, further comprising: (e) recording in said security data nonvolatile memory during a period in which said unregistered operation control means enables said electronic product to operate. When the security data to be registered is registered, the security data registration detecting means shifts to the same processing as when the security data registration detecting means detects that the security data has been registered. 5. The electronic device security device according to claim 1, wherein: (a) a nonvolatile memory for storing security data and reference data as data having a predetermined relationship with the security data; and (b) the nonvolatile memory. If there is no predetermined relationship between the security data to be read and the reference data, a judging means for judging that either the security data is unregistered or the security data nonvolatile memory is absent. ,
(C) measuring means for measuring the lapse of the predetermined time from the point of time of the change of the electrical state; and (d) the judging means judges that the security data has not been registered or the security data nonvolatile memory is not present. In the case of unregistered operation control means to enable the electronic product within a predetermined time from the time of the change of the electrical state, and then to disable the operation,
Security device for electrical products including. 6. The security device for an electric product according to claim 5, further comprising: (e) registration of the security data during a period in which the non-registered operation control means enables the operation of the electric product. In such a case, the electronic device security device includes a shift unit that shifts to the same processing as when the determination unit determines that the nonvolatile memory exists and the security data is already registered therein. 7. The electric appliance security device according to claim 1, wherein the electric state change time includes an electric operation start time of the electric product when power is supplied to the electric product. Product security device. 8. Security data for checking a matching relationship with a security code fetched from outside,
Writing means for associating the security data with reference data as data having a predetermined relationship in a nonvolatile security data storage memory; and writing the security data and reference data read from the security data storage memory into the predetermined format. A security data storage memory presence / absence detection device, comprising: a predetermined relationship examination means for examining the presence / absence of a relationship and determining that the security data storage memory has been removed if the predetermined relationship does not exist. 9. A security method for making an electronic product usable if there is a match between stored security data and a security code fetched from outside, wherein the security data is registered in the security memory. A security method including, if not performed, prohibiting the operation of the electrical product after a predetermined time has elapsed from a time point of a change in an electrical state leading to the start of operation of the electrical product.