JP2020160801A - Information processor, program, and method for determining authenticity of device to be determined - Google Patents

Abstract

To provide an information processor capable of easily and highly accurately determining the authenticity of a device to be determined as to whether it is a genuine product or a non-genuine product.SOLUTION: An authenticity determination unit 50 determines whether a memory device 3 is a genuine product or a non-genuine product based on a first result of comparison between a first measured current value measured by a current value measuring circuit 13 during a first period P12 in which a memory controller 31 operates and a first reference current value obtained in advance for the genuine or non-genuine product in the first period P12, and also based on a second result of comparison between a second measured current value measured by the current value measuring circuit 13 during a second period P13 in which a memory core 32 operates and a second reference current value obtained in advance for the genuine or non-genuine product in the second period P13.SELECTED DRAWING: Figure 2

Description

The present invention relates to an information processing device, a program, and a method for determining authenticity of a device to be determined.

In Patent Document 1 below, in a memory system including a host device and a memory device connected to the host device, the current consumption flowing from the host device to the memory device is measured, and the amount of change in the current consumption per unit time is calculated as the current consumption. It is calculated as the rate of change, and by comparing the rate of change pattern of the current consumption created for the memory device with the rate of change pattern of the current consumption for the genuine product, it is determined whether or not the memory device is a genuine product. The memory system to be used is disclosed.

Japanese Patent No. 60688878

As a technique for protecting the content data stored in the memory device, modern encryption such as AES or RSA is generally used. However, if confidential information such as a private key is determined by analysis by a third party, there is a problem that a non-genuine product that completely copies all the functions of the genuine product is easily manufactured.

Further, Patent Document 1 discloses only an embodiment in which a host device executes an authenticity determination of a memory device. However, the mode of unauthorized use is not limited to the case where a non-genuine memory device is used, and the non-genuine host device is used for the purpose of illegally copying the content data stored in the genuine memory device. It may also be used. Therefore, in order to properly protect the content data from unauthorized copying and the like, it is necessary to stop the operation of the memory system when the host device is a non-genuine product. For that purpose, the function of determining whether or not the host device is a genuine product in the memory device, and the function of determining whether or not the host device and the memory device are genuine products by themselves (self-authentication judgment). The function to do is desired.

The present invention has been made in view of such circumstances, and is an information processing device capable of easily and highly accurately determining the authenticity of a device to be judged whether it is a genuine product or a non-genuine product. The purpose is to obtain a method for determining the authenticity of a program and a device to be determined.

The information processing device according to the first aspect of the present invention is an information processing device having a function of determining the authenticity of a determined device having a first processing circuit and a second processing circuit having different functions, and is the first. A power supply unit that supplies power to the processing circuit and the second processing circuit, a current measuring unit that measures the current flowing from the power supply unit to the first processing circuit and the second processing circuit, and the above. A determination unit for determining whether the device to be determined is a genuine product or a non-genuine product is provided, and the determination unit is measured by the current measuring unit during the first period in which the first processing circuit operates. The first comparison result between the first measured current value obtained and the first reference current value obtained in advance for a genuine product or a non-genuine product for the first period, and the second processing circuit. The second measured current value measured by the current measuring unit in the second period during which the current is operated, and the second reference current value previously obtained for the genuine or non-genuine product in the second period. It is characterized in that it determines whether the device to be determined is a genuine product or a non-genuine product based on the second comparison result of the above.

According to the information processing apparatus according to the first aspect, the determination unit includes the first measured current value measured by the current measurement unit in the first period in which the first processing circuit operates, and the first period. The first comparison result with the first reference current value obtained in advance for the genuine product or the non-genuine product, and the second measured by the current measuring unit in the second period in which the second processing circuit operates. Based on the second comparison result between the measured current value of 2 and the second reference current value obtained in advance for the genuine product or the non-genuine product for the second period, the device to be determined is normal. Determine whether it is a product or a non-genuine product. Therefore, even if a non-genuine product that completely copies all the functions of the genuine product is manufactured, the power consumption characteristics of the genuine product and the non-genuine product are different due to differences in the device structure and manufacturing process. Due to the difference, the measured current value of the non-genuine product (or genuine product) does not match the reference current value of the genuine product (or non-genuine product). Therefore, the determination unit can easily determine the authenticity of the device to be determined. Moreover, since the authenticity is determined based on the current consumption characteristics of both the first processing circuit and the second processing circuit having different functions, it is possible for the determination unit to execute the authenticity determination of the device to be determined with higher accuracy. It becomes.

The information processing apparatus according to the second aspect of the present invention supplies power to the first processing circuit and the second processing circuit having different functions, and the first processing circuit and the second processing circuit. An information processing device having a unit and an authenticity determination function of the device to be determined, the current measuring unit for measuring the current flowing from the power supply unit to the first processing circuit and the second processing circuit. The determination device includes a determination unit for determining whether the device to be determined is a genuine product or a non-genuine product, and the determination unit is provided by the current measurement unit during a first period in which the first processing circuit operates. The first comparison result between the measured first measured current value and the first reference current value obtained in advance for a genuine product or a non-genuine product for the first period, and the second process. The second measured current value measured by the current measuring unit in the second period during which the circuit operates, and the second reference current value previously obtained for the genuine or non-genuine product in the second period. Based on the second comparison result with and, it is characterized in that it is determined whether the device to be determined is a genuine product or a non-genuine product.

According to the information processing apparatus according to the second aspect, the determination unit includes the first measured current value measured by the current measurement unit in the first period in which the first processing circuit operates, and the first period. The first comparison result with the first reference current value obtained in advance for the genuine product or the non-genuine product, and the second measured by the current measuring unit in the second period in which the second processing circuit operates. Based on the second comparison result between the measured current value of 2 and the second reference current value obtained in advance for the genuine product or the non-genuine product for the second period, the device to be determined is normal. Determine whether it is a product or a non-genuine product. Therefore, even if a non-genuine product that completely copies all the functions of the genuine product is manufactured, the power consumption characteristics of the genuine product and the non-genuine product are different due to differences in the device structure and manufacturing process. Due to the difference, the measured current value of the non-genuine product (or genuine product) does not match the reference current value of the genuine product (or non-genuine product). Therefore, the determination unit can easily determine the authenticity of the device to be determined. Moreover, since the authenticity is determined based on the current consumption characteristics of both the first processing circuit and the second processing circuit having different functions, it is possible for the determination unit to execute the authenticity determination of the device to be determined with higher accuracy. It becomes.

The information processing device according to the third aspect of the present invention is an information processing device having an authenticity determination function that uses itself as a determination device, and has a first processing circuit and a second processing circuit having different functions. A power supply unit that supplies power to the first processing circuit and the second processing circuit, and a current measuring unit that measures the current flowing from the power supply unit to the first processing circuit and the second processing circuit. The determination unit includes a determination unit for determining whether the device to be determined is a genuine product or a non-genuine product, and the determination unit measures the current during the first period in which the first processing circuit operates. The first comparison result between the first measured current value measured by the unit and the first reference current value obtained in advance for a genuine product or a non-genuine product for the first period, and the second The second measured current value measured by the current measuring unit in the second period in which the processing circuit of the above is operated, and the second reference obtained in advance for the genuine or non-genuine product in the second period. It is characterized in that it is determined whether the device to be determined is a genuine product or a non-genuine product based on the second comparison result with the current value.

According to the information processing apparatus according to the third aspect, the determination unit includes the first measured current value measured by the current measurement unit in the first period in which the first processing circuit operates, and the first period. The first comparison result with the first reference current value obtained in advance for the genuine product or the non-genuine product, and the second measured by the current measuring unit in the second period in which the second processing circuit operates. Based on the second comparison result between the measured current value of 2 and the second reference current value obtained in advance for the genuine product or the non-genuine product for the second period, the device to be determined is normal. Determine whether it is a product or a non-genuine product. Therefore, even if a non-genuine product that completely copies all the functions of the genuine product is manufactured, the power consumption characteristics of the genuine product and the non-genuine product are different due to differences in the device structure and manufacturing process. Due to the difference, the measured current value of the non-genuine product (or genuine product) does not match the reference current value of the genuine product (or non-genuine product). Therefore, the determination unit can easily determine the authenticity of the device to be determined. Moreover, since the authenticity is determined based on the current consumption characteristics of both the first processing circuit and the second processing circuit having different functions, it is possible for the determination unit to execute the authenticity determination of the device to be determined with higher accuracy. It becomes.

The information processing device according to the fourth aspect of the present invention is the information processing device according to any one of the first to third aspects, and the determination unit is particularly measured by the current measurement unit at a plurality of measurement timings. A measured current value pattern is created by arranging a plurality of measured current values acquired from the current measuring unit and a plurality of measured current values acquired by the current value acquisition unit in chronological order. A pattern comparison unit that compares the measured current value pattern created by the pattern creation unit with the reference current value pattern that is the reference current value pattern obtained in advance for the genuine or non-genuine product. , Is characterized by having.

According to the information processing device according to the fourth aspect, the determination unit determines whether the device to be determined is a genuine product or a non-genuine product based on the comparison result between the measured current value pattern and the reference current value pattern. judge. Since non-genuine products are often inferior products, the absolute value of the current consumption of non-genuine products is often larger than that of genuine products. According to the information processing apparatus according to the fourth aspect, the determination unit compares the measured current value pattern with the reference current value pattern instead of the rate of change pattern of the current consumption, so that even if the genuine product and the non-genuine product are consumed. Even when the current change rate patterns are similar, it is possible to accurately determine the authenticity of the device to be determined.

The information processing apparatus according to the fifth aspect of the present invention is the information processing apparatus according to the fourth aspect. In particular, the pattern comparison unit includes a plurality of measured current values constituting the actually measured current value pattern and a reference current value pattern. Each of the plurality of reference current values constituting the above is compared, and the determination unit determines whether the device to be determined is a genuine product depending on whether or not all the measured current values match the corresponding reference current values. It is characterized by determining whether it is a non-genuine product.

According to the information processing device according to the fifth aspect, the determination unit determines whether the device to be determined is a genuine product or a non-genuine product, depending on whether or not all the measured current values match the corresponding reference current values. Is determined. Therefore, even if only a part of the measured current value pattern of the non-genuine product (or non-genuine product) is different from the reference current value pattern of the genuine product (or non-genuine product), the authenticity of the device to be judged can be determined with high accuracy. It becomes possible to execute.

The information processing apparatus according to the sixth aspect of the present invention is the information processing apparatus according to the fourth aspect. In particular, the pattern comparison unit includes a plurality of measured current values constituting the actually measured current value pattern and a reference current value pattern. Each of the plurality of reference current values constituting the above is compared, and the determination unit determines that the ratio of the measured current value that matches the corresponding reference current value among all the measured current values is equal to or higher than the first threshold value. It is characterized in that it determines whether or not the device to be determined is a genuine product or a non-genuine product.

According to the information processing apparatus according to the sixth aspect, the determination unit determines whether or not the ratio of the measured current value that matches the corresponding reference current value among all the measured current values is equal to or higher than the first threshold value. It is determined whether the device to be judged is a genuine product or a non-genuine product. Therefore, even if the measured current value of the genuine product (or non-genuine product) increases or decreases momentarily due to sudden noise or the like, the genuine product (or non-genuine product) is mistakenly replaced with the non-genuine product (or non-genuine product). Or it is possible to avoid the situation where it is determined to be a genuine product).

The information processing device according to the seventh aspect of the present invention is the information processing device according to any one of the fourth to sixth aspects, and in particular, the determination unit is a process of creating an actually measured current value pattern by the pattern creation unit. , And, the comparison process of the measured current value pattern and the reference current value pattern by the pattern comparison unit is executed N times (N is a plurality of times), and among the N times comparison process by the pattern comparison unit, the measured current value pattern is It is determined whether the device to be judged is a genuine product or a non-genuine product depending on whether or not the ratio determined to match the reference current value pattern is equal to or higher than the second threshold value. It is a feature.

According to the information processing apparatus according to the seventh aspect, the determination unit executes the pattern creation process by the pattern creation unit and the pattern comparison process by the pattern comparison unit a plurality of N times, and the pattern comparison unit performs the comparison process N times. Of these, the device to be judged is a genuine product or a non-genuine product, depending on whether or not the ratio of the measured current value pattern determined to match the reference current value pattern is equal to or higher than the second threshold value. Determine if there is. In this way, a series of processes by the pattern creation unit and the pattern comparison unit are repeated N times a plurality of times, and the authenticity of the device to be determined is determined based on the comparison result of N times by the pattern comparison unit to improve the determination accuracy. It becomes possible to improve.

The information processing device according to the eighth aspect of the present invention is the information processing device according to any one of the first to third aspects, and the determination unit is particularly measured by the current measurement unit at a plurality of measurement timings. A representative value calculation that calculates a predetermined measured representative value based on the current value acquisition unit that acquires the plurality of measured current values from the current measuring unit and the plurality of measured current values acquired by the current value acquiring unit. It is characterized by having a unit, a representative value comparison unit that compares an actually measured representative value calculated by the representative value calculation unit with a reference representative value that is a representative value previously obtained for a genuine product or a non-genuine product. Is to be.

According to the information processing apparatus according to the eighth aspect, the determination unit is based on the comparison result between the actually measured representative value calculated by the representative value calculation unit and the reference representative value previously obtained for the genuine product or the non-genuine product. Then, it is determined whether the device to be judged is a genuine product or a non-genuine product. Therefore, it is not necessary to create the measured current value pattern and it is not necessary to hold the reference current value pattern, so that the authenticity determination of the device to be determined can be easily executed.

The information processing apparatus according to the ninth aspect of the present invention is the information processing apparatus according to the eighth aspect. In particular, the representative value calculation unit has at least one of an average value, a maximum value, and a minimum value as actual measurement representative values. It is characterized by calculating one.

According to the information processing apparatus according to the ninth aspect, the representative value calculation unit calculates at least one of an average value, a maximum value, and a minimum value as actual measurement representative values. In this way, by using at least one of the average value, the maximum value, and the minimum value as the measured representative value, the measured representative value can be easily calculated.

The information processing device according to the tenth aspect of the present invention is the information processing device according to any one of the first to ninth aspects, and in particular, the determination unit sets the first period and the second period. It is characterized by further having a period setting unit for setting variably.

According to the information processing apparatus according to the tenth aspect, the period setting unit variably sets the first period and the second period. Therefore, the first period and the second period for which the authenticity judgment of the device to be judged is executed can be statically or dynamically changed by the period setting unit, which makes it more difficult for a third party to analyze the judgment algorithm. It becomes possible to do.

The information processing device according to the eleventh aspect of the present invention is the information processing device according to any one of the first to tenth aspects. In particular, the determined device includes the first reference current value and the second. The determination unit further includes a storage unit for storing the reference current value of the above, and is characterized in that the determination unit reads out the first reference current value and the second reference current value from the storage unit.

According to the information processing apparatus according to the eleventh aspect, the first reference current value and the second reference current value are stored in the storage unit of the determination device. Since the reference current value of the device to be determined depends on the structure of the device, the manufacturing process, etc., it differs for each device. Therefore, by storing the reference current value obtained for a certain device to be determined in the storage unit of the device to be determined, it is possible to easily manage the reference current value different for each device.

The program according to the twelfth aspect of the present invention includes a power supply unit that supplies power to a first processing circuit and a second processing circuit having different functions of the device to be determined, and the first processing unit from the power supply unit. A computer mounted on an information processing device including a processing circuit and a current measuring unit for measuring a current flowing through the second processing circuit determines whether the device to be determined is a genuine product or a non-genuine product. The determination means is a program for functioning as a determination means, wherein the determination means includes a first measured current value measured by the current measuring unit during the first period in which the first processing circuit operates, and the first measured current value. The current measuring unit is in the first comparison result with the first reference current value obtained in advance for the genuine product or the non-genuine product for one period and the second period in which the second processing circuit operates. Based on the result of the second comparison between the second measured current value measured by the above and the second reference current value obtained in advance for the genuine or non-genuine product for the second period. It is characterized in that it determines whether the device to be determined is a genuine product or a non-genuine product.

According to the program according to the twelfth aspect, the determination means is normal with respect to the first measured current value measured by the current measuring unit in the first period in which the first processing circuit operates and the first measured period. The first comparison result with the first reference current value obtained in advance for the product or non-genuine product, and the second measured by the current measuring unit in the second period during which the second processing circuit operates. Based on the second comparison result between the measured current value and the second reference current value obtained in advance for the genuine or non-genuine product for the second period, the device to be judged is the genuine product. Determine if it is a non-genuine product. Therefore, even if a non-genuine product that completely copies all the functions of the genuine product is manufactured, the power consumption characteristics of the genuine product and the non-genuine product are different due to differences in the device structure and manufacturing process. Due to the difference, the measured current value of the non-genuine product (or genuine product) does not match the reference current value of the genuine product (or non-genuine product). Therefore, it is possible to easily perform the authenticity determination of the device to be determined by the determination means. Moreover, since the authenticity is determined based on the current consumption characteristics of both the first processing circuit and the second processing circuit having different functions, it is possible to execute the authenticity determination of the device to be determined with higher accuracy by the determination means. It becomes.

The program according to the thirteenth aspect of the present invention includes a first processing circuit and a second processing circuit having different functions, and a power supply unit that supplies power to the first processing circuit and the second processing circuit. A computer mounted on an information processing device including an authenticity determination function of a device to be determined, and a current measuring unit for measuring a current flowing from the power supply unit to the first processing circuit and the second processing circuit. , A program for functioning as a determination means for determining whether the device to be determined is a genuine product or a non-genuine product, wherein the determination means is a first period during which the first processing circuit operates. The first comparison result between the first measured current value measured by the current measuring unit and the first reference current value previously obtained for a genuine product or a non-genuine product for the first period. , The second measured current value measured by the current measuring unit in the second period during which the second processing circuit operates, and the genuine or non-genuine product obtained in advance for the second period. It is characterized in that it determines whether the device to be determined is a genuine product or a non-genuine product based on the second comparison result with the second reference current value.

According to the program according to the thirteenth aspect, the determination means is normal with respect to the first measured current value measured by the current measuring unit in the first period in which the first processing circuit operates and the first measured period. The first comparison result with the first reference current value obtained in advance for the product or non-genuine product, and the second measured by the current measuring unit in the second period during which the second processing circuit operates. Based on the second comparison result between the measured current value and the second reference current value obtained in advance for the genuine or non-genuine product for the second period, the device to be judged is the genuine product. Determine if it is a non-genuine product. Therefore, even if a non-genuine product that completely copies all the functions of the genuine product is manufactured, the power consumption characteristics of the genuine product and the non-genuine product are different due to differences in the device structure and manufacturing process. Due to the difference, the measured current value of the non-genuine product (or genuine product) does not match the reference current value of the genuine product (or non-genuine product). Therefore, it is possible to easily perform the authenticity determination of the device to be determined by the determination means. Moreover, since the authenticity is determined based on the current consumption characteristics of both the first processing circuit and the second processing circuit having different functions, it is possible to execute the authenticity determination of the device to be determined with higher accuracy by the determination means. It becomes.

The program according to the fourteenth aspect of the present invention includes a first processing circuit and a second processing circuit having different functions, and the first processing circuit and the first processing circuit, which have an authenticity determination function of the device to be determined. Mounted on an information processing device including a power supply unit that supplies power to the processing circuit 2 and a current measuring unit that measures the current flowing from the power supply unit to the first processing circuit and the second processing circuit. This is a program for causing the computer to function as a determination means for determining whether the device to be determined is a genuine product or a non-genuine product, and the determination means operates the first processing circuit. The first of the first measured current value measured by the current measuring unit in the first period and the first reference current value obtained in advance for a genuine product or a non-genuine product in the first period. The comparison result, the second measured current value measured by the current measuring unit in the second period during which the second processing circuit operates, and the genuine or non-genuine product for the second period. It is characterized in that it is determined whether the device to be determined is a genuine product or a non-genuine product based on a second comparison result with a second reference current value obtained in advance. ..

According to the program according to the fourteenth aspect, the determination means is normal with respect to the first measured current value measured by the current measuring unit in the first period in which the first processing circuit operates and the first measured period. The first comparison result with the first reference current value obtained in advance for the product or non-genuine product, and the second measured by the current measuring unit in the second period during which the second processing circuit operates. Based on the second comparison result between the measured current value and the second reference current value obtained in advance for the genuine or non-genuine product for the second period, the device to be judged is the genuine product. Determine if it is a non-genuine product. Therefore, even if a non-genuine product that completely copies all the functions of the genuine product is manufactured, the power consumption characteristics of the genuine product and the non-genuine product are different due to differences in the device structure and manufacturing process. Due to the difference, the measured current value of the non-genuine product (or genuine product) does not match the reference current value of the genuine product (or non-genuine product). Therefore, it is possible to easily perform the authenticity determination of the device to be determined by the determination means. Moreover, since the authenticity is determined based on the current consumption characteristics of both the first processing circuit and the second processing circuit having different functions, it is possible to execute the authenticity determination of the device to be determined with higher accuracy by the determination means. It becomes.

The authenticity determination method of the determination device according to the fifteenth aspect of the present invention includes a power supply unit that supplies power to a first processing circuit and a second processing circuit having different functions of the determination device, and the power supply. In an information processing device including a current measuring unit for measuring a current flowing from a unit to the first processing circuit and the second processing circuit, whether the determined device is a genuine product or a non-genuine product is determined. It is a method of determining the authenticity of the device to be determined, which determines, with respect to the first measured current value measured by the current measuring unit in the first period in which the first processing circuit operates and the first period. The result of the first comparison with the first reference current value obtained in advance for the genuine or non-genuine product and the measurement by the current measuring unit in the second period during which the second processing circuit operates. Based on the second comparison result between the second measured current value and the second reference current value obtained in advance for the genuine or non-genuine product for the second period, the device to be determined. It is characterized by comprising a step of determining whether is a genuine product or a non-genuine product.

According to the authenticity determination method of the device to be determined according to the fifteenth aspect, the first measured current value measured by the current measuring unit in the first period in which the first processing circuit operates and the first period. The first comparison result with the first reference current value obtained in advance for the genuine product or the non-genuine product, and the second measured by the current measuring unit in the second period in which the second processing circuit operates. Based on the second comparison result between the measured current value of 2 and the second reference current value obtained in advance for the genuine product or the non-genuine product for the second period, the device to be determined is normal. Whether it is a product or a non-genuine product is determined. Therefore, even if a non-genuine product that completely copies all the functions of the genuine product is manufactured, the power consumption characteristics of the genuine product and the non-genuine product are different due to differences in the device structure and manufacturing process. Due to the difference, the measured current value of the non-genuine product (or genuine product) does not match the reference current value of the genuine product (or non-genuine product). Therefore, it is possible to easily perform the authenticity determination of the device to be determined. Moreover, since the authenticity determination is performed based on the current consumption characteristics of both the first processing circuit and the second processing circuit having different functions, the authenticity determination of the device to be determined can be executed with higher accuracy.

The authenticity determination method of the device to be determined according to the 16th aspect of the present invention supplies a power source to the first processing circuit and the second processing circuit having different functions, and the first processing circuit and the second processing circuit. An information processing device including an authenticity determination function of a device to be determined having a power supply unit for supplying power, and a current measuring unit for measuring a current flowing from the power supply unit to the first processing circuit and the second processing circuit. In the method for determining the authenticity of the device to be determined, which determines whether the device to be determined is a genuine product or a non-genuine product, the current measurement is performed during the first period in which the first processing circuit operates. The first comparison result between the first measured current value measured by the unit and the first reference current value obtained in advance for a genuine product or a non-genuine product for the first period, and the second The second measured current value measured by the current measuring unit in the second period in which the processing circuit of the above is operated, and the second reference obtained in advance for the genuine or non-genuine product in the second period. It is characterized by comprising a step of determining whether the device to be determined is a genuine product or a non-genuine product based on the second comparison result with the current value.

According to the authenticity determination method of the device to be determined according to the sixteenth aspect, the first measured current value measured by the current measuring unit in the first period in which the first processing circuit operates and the first measured period. The first comparison result with the first reference current value obtained in advance for the genuine product or the non-genuine product, and the second measured by the current measuring unit in the second period in which the second processing circuit operates. Based on the second comparison result between the measured current value of 2 and the second reference current value obtained in advance for the genuine product or the non-genuine product for the second period, the device to be determined is normal. Whether it is a product or a non-genuine product is determined. Therefore, even if a non-genuine product that completely copies all the functions of the genuine product is manufactured, the power consumption characteristics of the genuine product and the non-genuine product are different due to differences in the device structure and manufacturing process. Due to the difference, the measured current value of the non-genuine product (or genuine product) does not match the reference current value of the genuine product (or non-genuine product). Therefore, it is possible to easily perform the authenticity determination of the device to be determined. Moreover, since the authenticity determination is performed based on the current consumption characteristics of both the first processing circuit and the second processing circuit having different functions, the authenticity determination of the device to be determined can be executed with higher accuracy.

The authenticity determination method of the determination device according to the seventeenth aspect of the present invention includes a first processing circuit and a second processing circuit having different functions, the first processing circuit and the second processing circuit having different functions, and the first processing circuit. A power supply unit that supplies power to the processing circuit and the second processing circuit, and a current measuring unit that measures the current flowing from the power supply unit to the first processing circuit and the second processing circuit. A method for determining the authenticity of the device to be determined, which determines whether the device to be determined is a genuine product or a non-genuine product in the information processing device provided, and is a first period in which the first processing circuit operates. The first comparison result between the first measured current value measured by the current measuring unit and the first reference current value obtained in advance for a genuine product or a non-genuine product for the first period. , The second measured current value measured by the current measuring unit in the second period during which the second processing circuit operates, and the genuine or non-genuine product obtained in advance for the second period. It is characterized by comprising a step of determining whether the device to be determined is a genuine product or a non-genuine product based on the second comparison result with the second reference current value.

According to the authenticity determination method of the device to be determined according to the seventeenth aspect, the first measured current value measured by the current measuring unit in the first period in which the first processing circuit operates, and the first period. The first comparison result with the first reference current value obtained in advance for the genuine product or the non-genuine product, and the second measured by the current measuring unit in the second period in which the second processing circuit operates. Based on the second comparison result between the measured current value of 2 and the second reference current value obtained in advance for the genuine product or the non-genuine product for the second period, the device to be determined is normal. Whether it is a product or a non-genuine product is determined. Therefore, even if a non-genuine product that completely copies all the functions of the genuine product is manufactured, the power consumption characteristics of the genuine product and the non-genuine product are different due to differences in the device structure and manufacturing process. Due to the difference, the measured current value of the non-genuine product (or genuine product) does not match the reference current value of the genuine product (or non-genuine product). Therefore, it is possible to easily perform the authenticity determination of the device to be determined. Moreover, since the authenticity determination is performed based on the current consumption characteristics of both the first processing circuit and the second processing circuit having different functions, the authenticity determination of the device to be determined can be executed with higher accuracy.

According to the present invention, it is possible to easily and highly accurately determine whether the device to be determined is a genuine product or a non-genuine product.

It is a figure which shows the structure of the memory system which concerns on embodiment of this invention. It is a figure which shows the structure of the host device simply. It is a figure which shows the structure of the memory apparatus simplified. It is a figure which shows the function which is realized by executing a program by a CPU. It is a figure which shows an example of the current consumption characteristic of a memory apparatus. It is a flowchart which shows the flow of the authenticity determination processing of a memory device by a host device. It is a figure which shows an example of the measured current value pattern and the reference current value pattern. It is a figure which shows another example of the measured current value pattern. It is a figure which shows the other configuration example of a host device. It is a flowchart which shows the flow of the authenticity determination processing of a memory device by a host device. It is a figure which shows the function which is realized by executing a program by a CPU. It is a figure which shows an example of the current consumption characteristic of a memory apparatus. It is a flowchart which shows the flow of the authenticity determination processing of a memory device by a host device. It is a figure which shows the structure of the host device simply. It is a figure which shows the structure of the memory apparatus simplified. It is a figure which shows the structure of an authentication control circuit. It is a figure which shows the structure of the host device simply. It is a figure which shows the structure of the memory apparatus simplified. It is a figure which shows the structure of an authentication control circuit.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, the elements with the same reference numerals in different drawings indicate the same or corresponding elements.

<Embodiment 1>
FIG. 1 is a diagram showing a configuration of a memory system 1 according to a first embodiment of the present invention. As shown in FIG. 1, the memory system 1 includes a host device 2 and a memory device 3 detachably connected to the host device 2. The host device 2 is a first information processing device such as a personal computer, and the memory device 3 is a second information processing device that operates by receiving power supply from the host device 2, for example, a memory card of a flash memory. .. As another example, the first information processing device is the main body of the printer or the multifunction device, and the second information processing device is the toner cartridge. Alternatively, the first information processing device is the main body of the game machine, and the second information processing device is a memory card in which the game program is stored.

In the present embodiment, the mode in which the host device 2 executes the authenticity determination of the memory device 3, that is, the first information processing device such as the host device 2 is the determination device, and the second information processing such as the memory device 3 is performed. A mode in which the device is a determination device will be described.

FIG. 2 is a diagram showing a simplified configuration of the host device 2. As shown in FIG. 2, the host device 2 includes a SoC (System on a Chip) 11, a power supply control unit 12, a current value measuring circuit 13, and a memory interface 14. Each of the SoC 11 and the memory interface 14 is a signal processing circuit on the host device 2 side. The SoC11 has a CPU 22, a decoder 23, an expected value storage memory 24, a GPIO (General Purpose Input / Output) 25, an ADC (Analog to Digital Converter) 26, a command buffer 27, and data connected to each other via a bus 21. It is configured to include a buffer 28 and a storage unit 29 such as a ROM or RAM. The program 101 is stored in the storage unit 29. The host device 2 supplies a power source for operating the memory device 3 connected to itself from the power supply VCS1 (power supply unit) via the power supply control unit 12 and the resistance element R to the memory device 3 (memory controller 31 and memory copy 32). ). The current value measuring circuit 13 measures the current value of the current flowing from the power supply VCC1 to the memory device 3 by measuring the voltage across the resistance element R.

FIG. 3 is a diagram showing a simplified configuration of the memory device 3. As shown in FIG. 3, the memory device 3 is configured to include a memory controller 31 and a memory core 32 having different functions. The memory controller 31 and the memory core 32 are signal processing circuits on the memory device 3 side, respectively. The memory controller 31 includes a host interface 41, a decoder 42, and a memory core interface 43. Expected value data 201, which will be described later, is stored in a specific address area of the memory core 32.

FIG. 4 is a diagram showing a function realized by the CPU 22 executing the program 101 shown in FIG. As shown in FIG. 4, when the CPU 22 executes the program 101 read from the storage unit 29, the CPU 22 determines whether the memory device 3 connected to the host device 2 is a genuine product or a non-genuine product. It functions as a determination authenticity determination unit 50. In other words, the program 101 is a program for causing the computer mounted on the host device 2 as the information processing device to function as the authenticity determination unit 50.

As shown in FIG. 4, the authenticity determination unit 150 functions as a period setting unit 51, a current value acquisition unit 52, a pattern creation unit 53, and a pattern comparison unit 54. The function of the authenticity determination unit 50 is not limited to the case where it is realized by software processing by the CPU 22, and may be realized by hardware processing using a dedicated circuit or the like.

Since the structure and manufacturing process of the semiconductor device are different between the genuine product (genuine product) and the non-genuine product (counterfeit product) of the memory device 3, the current consumption characteristics are significantly different. The host device 2 according to the present embodiment creates a measured current value pattern by actually measuring the current consumption value (absolute value) of the memory device 3, and the measured current value pattern and the known product or non-genuine product are known. By comparing with the reference current value pattern of, it is determined whether the memory device 3 connected to itself is a genuine product or a non-genuine product. Hereinafter, a detailed description will be given with reference to the drawings.

FIG. 5 is a diagram showing an example of the current consumption characteristics of the memory device 3. In FIG. 5, the memory device 3 receives a read command from the host device 2, reads the content data specified by the read command from the memory core 32, and transmits the read content data to the host device 2. It shows the characteristics.

The periods P11 and P15 are standby periods in which the memory device 3 is waiting for command reception from the host device 2. During the periods P11 and P15, neither the memory controller 31 nor the memory core 32 is operating.

The period P12 is a period during which the memory device 3 receives the read command transmitted by the host device 2. During the period P12, the memory controller 31 is operating and the memory core 32 is not operating.

The period P13 is a period during which access to the memory core 32 is being executed in order to read the content data from the memory core 32. During the period P13, the memory controller 31 is not operating and the memory core 32 is operating.

The period P14 is a period in which the content data specified by the read command is read from the memory core 32 and the content data is transmitted to the host device 2. In the period P14, both the memory controller 31 and the memory core 32 are operating.

The authenticity determination unit 50 according to the present embodiment has a first measured current value pattern measured by the current value measuring circuit 13 in the period P12 in which the memory controller 31 operates independently, and a first first measured in advance for the period P12. Compare with the reference current value pattern of. Further, the authenticity determination unit 50 includes a second measured current value pattern measured by the current value measuring circuit 13 during the period P13 in which the memory core 32 operates independently, and a second reference current obtained in advance for the period P13. Compare with the value pattern. Then, the authenticity determination unit 50 determines whether the memory device 3 is a genuine product or a non-genuine product based on these comparison results.

In the case of the genuine memory device 3, the type of semiconductor device to be mounted and the manufacturing process of each device are strictly controlled, so that the current consumption characteristics of the memory device 3 in each period P11 to P15 are substantially constant. .. Therefore, information indicating the current consumption characteristics of P11 to P15 for each period is created before shipment from the factory and stored as encrypted expected value data 201 (see FIG. 3) in a specific address area of the memory core 32. There is. In the example of the present embodiment, each of the period P12 in which the memory controller 31 is operating independently and the period P13 in which the memory core 32 is operating independently is defined.
-Transition pattern of current consumption value obtained by sampling the current consumption value at a predetermined sampling frequency (reference current value pattern)
-Maximum, minimum, and average current consumption values (reference representative values)
Is stored in the memory core 32 as the expected value data 201.

If the non-genuine product to be excluded has already been specified, the memory core 32 uses the reference current value pattern and the reference representative value for the non-genuine product instead of the reference current value pattern and the reference representative value for the genuine product. It may be stored in. For example, when a reference current value pattern for a genuine product is used, whether or not the memory device 3 is a genuine product depends on whether or not the measured current value pattern (details will be described later) and the reference current value pattern match. Can be determined. When a reference current value pattern relating to a non-genuine product is used, it can be determined whether or not the memory device 3 is a non-genuine product depending on whether or not the measured current value pattern and the reference current value pattern match. The same applies to the reference representative value. In this embodiment and each modification described later, an example in which a reference current value pattern and a reference representative value for a genuine product are used will be described.

FIG. 6 is a flowchart showing the flow of the authenticity determination process of the memory device 3 by the host device 2. When the memory device 3 is connected to the host device 2, in step SP101, the CPU 22 (period setting unit 51) first sets a plurality of determination target periods to be executed for the authenticity determination from the periods P11 to P15. The period setting unit 51 can statically change the determination target period according to a predetermined rule, or dynamically changes the determination target period according to the cumulative number of times of authenticity determination, the operating status of the memory system 1, and the like. Can be changed to. In the example of the present embodiment, the period P12 in which the memory controller 31 is operating independently is set as the first determination target period, and the period P13 in which the memory core 32 is operating independently is the second determination target period. Is set as.

Further, the period setting unit 51 sets the processing contents of the authenticity determination to be executed for the first and second determination target periods, respectively. In the example of the present embodiment, "comparison processing between current value patterns" is set as the processing content of the authenticity determination for both the first and second determination target periods. However, this setting may be omitted when the comparison processing between current value patterns is executed as the default processing.

Next, in step SP102, the CPU 22 sets a read command for reading the desired expected value data 201 from the memory device 3 in the command buffer 27. The read command is transmitted from the command buffer 27 to the memory device 3 via the memory interface 14. The host interface 41 inputs the read command received from the host device 2 to the decoder 42. The decoder 42 inputs the read address of the desired expected value data 201 to the memory core interface 43 by decoding the input read command. The read address is input to the memory core 32 from the memory core interface 43, whereby the desired expected value data 201 is read from the memory core 32. In the example of the present embodiment, since the processing content of the authenticity determination is set to "comparison processing between current value patterns for the periods P12 and P13", the reference current value patterns for the periods P12 and P13 and the reference current value patterns for each period P12 and P13 are used. Data indicating a predetermined tolerance value corresponding to each is read from the memory core 32 as desired expected value data 201. The tolerance value is preset to an optimum value within the range of plus or minus several% to plus or minus ten and several percent according to the distribution mode of the current value in the reference current value pattern for each period P12 and P13. The read expected value data 201 is transmitted to the host device 2 via the memory core interface 43 and the host interface 41 in an encrypted state. The memory interface 14 inputs the expected value data 201 received from the memory device 3 to the decoder 23 via the data buffer 28. The decoder 23 decrypts the encrypted expected value data 201. The decoded expected value data 201 is stored in the expected value storage memory 24. In the example of the present embodiment, the reference current value pattern for each period P12 and P13 and the data indicating the predetermined tolerance value corresponding to each are stored in the expected value storage memory 24.

Next, in step SP103, the CPU 22 drives the ADC 26. Further, in the period P12, the CPU 22 sets a read command for reading desired content data from the memory device 3 in the command buffer 27. The read command is transmitted from the command buffer 27 to the memory device 3 via the memory interface 14. The host interface 41 inputs the read command received from the host device 2 to the decoder 42. The decoder 42 inputs the read address of the desired expected value data 201 to the memory core interface 43 by decoding the input read command. In the period P12, power is supplied from the power supply VCS1 to the memory controller 31 via the power supply control unit 12 and the resistance element R. When the power is supplied from the power supply VCS1 to the memory controller 31, a current flows through the resistance element R. The current value measuring circuit 13 actually measures the current value of the current flowing from the power supply VCC1 to the memory controller 31 by sampling the voltage across the resistance element R at a predetermined sampling frequency (for example, 1 MHz to several MHz). The measured current value for the period P12 is amplified by a preamplifier (not shown), AD-converted by the ADC 26, and then sequentially input to the CPU 22 by the current value acquisition unit 52. Instead of the above configuration in which the measured current value is amplified by the preamplifier before the AD conversion by the ADC 26, a configuration in which the measured current value is amplified by the multiplier after the AD conversion by the ADC 26 may be adopted (hereinafter, Similarly).

Further, following the period P12, in the period P13, the memory access to the memory core 32 is executed by inputting the read address from the memory core interface 43 to the memory core 32. In the period P13, power is supplied from the power supply VCS1 to the memory core 32 via the power supply control unit 12 and the resistance element R. When the power is supplied from the power supply VCS1 to the memory core 32, a current flows through the resistance element R. The current value measuring circuit 13 actually measures the current value of the current flowing from the power supply VCC1 to the memory core 32 by sampling the voltage across the resistance element R at a predetermined sampling frequency. The measured current value for the period P13 is amplified by a preamplifier (not shown), AD-converted by the ADC 26, and then sequentially input to the CPU 22 by the current value acquisition unit 52.

Next, in step SP104, the CPU 22 (pattern creation unit 53) arranges a plurality of measured current values sequentially acquired by the current value acquisition unit 52 in chronological order to obtain a measured current value pattern of the memory controller 31 for the period P12. , The measured current value pattern of the memory core 32 for the period P13 is created.

Next, in step SP105, the CPU 22 (pattern comparison unit 54) reads out the reference current value pattern and the data indicating the tolerance value from the expected value storage memory 24 for each of the periods P12 and P13 and acquires them.

Next, in step SP106, the CPU 22 (pattern comparison unit 54) sets the measured current value pattern created by the pattern creation unit 53 and the reference current value pattern read from the expected value storage memory 24 for each of the periods P12 and P13. Compare.

FIG. 7 is a diagram showing an example of the measured current value pattern and the reference current value pattern for the period P12. When the sampling frequency of the current value measuring circuit 13 is 1 MHz to several MHz and the length of the period P12 is several msec to several tens of msec, the actually measured current value pattern and the reference current value pattern are actually respectively. It is composed of hundreds of thousands to millions of measured current values and reference current values. However, FIG. 7 shows an example in which the measured current value pattern IP01 and the reference current value pattern IP02 are composed of seven measured current values X01 to X07 and reference current values Y01 to Y07, respectively, for the sake of simplification of the description. The pattern comparison unit 54 compares whether or not the difference between the corresponding measured current values X01 to X07 and the reference current values Y01 to Y07 is equal to or less than the tolerance value read from the expected value storage memory 24.

Next, in step SP107, the CPU 22 (authenticity determination unit 50) determines whether or not all the differences between the measured current value X and the reference current value Y are equal to or less than the allowable error value for each of the periods P12 and P13. Then, the authenticity determination unit 50 determines that the host device 2 is used when all the differences between the measured current value X and the reference current value Y are equal to or less than the permissible error values (that is, when they are exactly the same) for both the periods P12 and P13. The memory device 3 connected to is determined to be a genuine product, and the authenticity determination process is terminated. In the example shown in FIG. 7, the actually measured current value X and the reference current value Y completely match.

On the other hand, when at least one difference exceeds the tolerance value (that is, does not completely match) for each of the periods P12 and P13, the authenticity determination unit 50 determines that the memory device 3 connected to the host device 2 is not. It is determined that the product is a genuine product, and a process for eliminating the memory device 3 which is a non-genuine product is started. For example, by setting a control command for stopping the power supply to the power control unit 12 in the GPIO 25, the power supply from the power supply VCS1 to the memory device 3 is stopped.

FIG. 8 is a diagram showing another example of the measured current value pattern. The maximum, minimum, and average values of the seven measured current values constituting the measured current value pattern IP01A match those of the reference current value pattern IP02. However, since each measured current value of the measured current value pattern IP01A does not completely match each reference current value of the reference current value pattern IP02, the memory device 3 is determined to be a non-genuine product. Further, the rate of change between the measured current values adjacent to each other in the measured current value pattern IP01B matches those of the reference current value pattern IP02. However, since each measured current value of the measured current value pattern IP01B does not completely match each reference current value of the reference current value pattern IP02, the memory device 3 is determined to be a non-genuine product.

In the above description, the calculation for obtaining the difference between the measured current value X and the reference current value Y and the calculation for whether or not the difference between the current values is equal to or less than the allowable error value are executed by the software processing of the CPU 22. An example of doing so was described. However, in order to avoid an increase in the processing load of the CPU 22 due to the enormous number of samplings of the current value measuring circuit 13, these operations may be executed by hardware processing using a dedicated arithmetic unit. ..

FIG. 9 is a diagram showing another configuration example of the host device 2. The arithmetic unit 60 is mounted on the SoC11. The calculation for finding the difference between the measured current value X and the reference current value Y and the calculation for whether or not the difference between the current values is equal to or less than the tolerance value are executed by the calculator 60, and the result of these calculations is It is input from the arithmetic unit 60 to the CPU 22.

As described above, according to the host device 2 (information processing device) according to the present embodiment, the authenticity determination unit 50 is a current value measuring circuit in the first period P12 in which the memory controller 31 (first processing circuit) operates. First comparison between the first measured current value measured by 13 (current measuring unit) and the first reference current value obtained in advance for a genuine product or a non-genuine product for the first period P12. The result, the second measured current value measured by the current value measuring circuit 13 in the second period P13 in which the memory core 32 (second processing circuit) operates, and the genuine or non-genuine product with respect to the second period P13. It is determined whether the memory device 3 (determined device) is a genuine product or a non-genuine product based on the second comparison result with the second reference current value obtained in advance for the genuine product. To do. Therefore, even if a non-genuine product that completely copies all the functions of the genuine product is manufactured, the power consumption characteristics of the genuine product and the non-genuine product are different due to differences in the device structure and manufacturing process. Due to the difference, the measured current value of the non-genuine product (or genuine product) does not match the reference current value of the genuine product (or non-genuine product). Therefore, the authenticity determination unit 50 can easily execute the authenticity determination of the memory device 3. Moreover, since the authenticity determination is performed based on the current consumption characteristics of both the memory controller 31 and the memory core 32 having different functions, the authenticity determination unit 50 can execute the authenticity determination of the memory device 3 with higher accuracy. ..

Further, according to the host device 2 according to the present embodiment, the authenticity determination unit 50 determines whether the memory device 3 is a genuine product or a non-genuine product based on the comparison result between the measured current value pattern and the reference current value pattern. Is determined. Since non-genuine products are often inferior products, the absolute value of the current consumption of non-genuine products is often larger than that of genuine products. According to the host device 2 according to the present embodiment, the authenticity determination unit 50 compares the measured current value pattern with the reference current value pattern instead of the rate of change pattern of the current consumption, so that even if it is a genuine product and a non-genuine product, Even when the rate of change pattern of the current consumption is similar, it is possible to execute the authenticity determination of the memory device 3 with high accuracy.

Further, according to the host device 2 according to the present embodiment, the authenticity determination unit 50 is a genuine memory device 3 depending on whether or not all the measured current values match the corresponding reference current values. Determine whether it is a non-genuine product. Therefore, even if only a part of the measured current value pattern of the non-genuine product (or non-genuine product) is different from the reference current value pattern of the genuine product (or non-genuine product), the authenticity of the memory device 3 can be determined with high accuracy. It becomes possible to execute.

Further, according to the host device 2 according to the present embodiment, the period setting unit 51 variably sets the first and second determination target periods. Therefore, since the first and second determination target periods for which the authenticity determination of the memory device 3 is executed can be statically or dynamically changed by the period setting unit 51, it is more difficult for a third party to analyze the determination algorithm. It becomes possible to change.

Further, according to the host device 2 according to the present embodiment, the expected value data 201 is stored in the memory core 32 of the memory device 3. Since the expected value data 201 of the memory device 3 depends on the structure of the device, the manufacturing process, and the like, it differs for each device. Therefore, by storing the expected value data 201 obtained for a certain memory device 3 in the memory core 32 of the memory device 3, it is possible to easily manage the expected value data 201 different for each device.

Hereinafter, various modifications to the first embodiment will be described. The modifications described below can be applied in any combination of the modifications, and can also be applied in any combination with the embodiments 2 to 4 described later.

<Modification example 1>
In the first embodiment, the authenticity determination unit 50 determines that the memory device 3 is a genuine product when all the measured current values X for each period P12 and P13 completely match the corresponding reference current values Y. It was judged.

On the other hand, in the authenticity determination unit 50 according to the present modification, the ratio of the measured current value X that matches the corresponding reference current value Y among all the measured current values X is the first in both the periods P12 and P13. When it is equal to or more than the threshold value of, it is determined that the memory device 3 is a genuine product, and on the other hand, when the ratio is less than the first threshold value in at least one of the periods P12 and P13, the memory device It is determined that 3 is a non-genuine product. The optimum value of the first threshold value is also set in step SP101 according to the required determination accuracy and the like, and is set to a value of at least 51% or more.

According to the host device 2 according to the present modification, the authenticity determination unit 50 has a ratio of the measured current value X that matches the corresponding reference current value Y among all the measured current values X for each period P12 and P13. It is determined whether the memory device 3 is a genuine product or a non-genuine product depending on whether or not it is equal to or higher than the threshold value of 1. Therefore, for example, even if the measured current value X of the genuine product momentarily increases or decreases due to sudden noise or the like, it is possible to avoid a situation in which the genuine product is erroneously determined as a non-genuine product. It becomes.

<Modification 2>
In the first embodiment, in each period P12 and P13, the pattern creation unit 53 creates the measured current value pattern only once, and the pattern comparison unit 54 compares the measured current value pattern with the reference current value pattern only once. Then, the authenticity determination unit 50 determines the authenticity of the memory device 3 based on the result of the one-time comparison by the pattern comparison unit 54.

On the other hand, the authenticity determination unit 50 according to the present modification determines the authenticity of the memory device 3 based on the result of a plurality of comparisons by the pattern comparison unit 54.

FIG. 10 is a flowchart showing the flow of the authenticity determination process of the memory device 3 by the host device 2. Following step SP106, in step SP201, the authenticity determination unit 50 executes the comparison process between the measured current value pattern and the reference current value pattern by the pattern comparison unit 54 a predetermined N times (multiple N) for each period P12 and P13. Determine if it has been done.

If the comparison process is not executed N times for P12 and P13 in each period, the CPU 22 re-executes the processes of steps SP103 to SP106. On the other hand, when the comparison process is executed N times for each period P12 and P13, the CPU 22 shifts to the process of step SP107.

In step SP107, the authenticity determination unit 50 determines that the measured current value pattern matches the reference current value pattern among the N times comparison processing by the pattern comparison unit 54 in both the periods P12 and P13. When it is equal to or more than the second threshold value, it is determined that the memory device 3 is a genuine product, and on the other hand, when the ratio is less than the second threshold value in at least one of the periods P12 and P13, It is determined that the memory device 3 is a non-genuine product. As for the value of the predetermined number of times N, the optimum value is also set in step SP101 according to the required determination accuracy and the like. Further, the optimum value of the second threshold value is also set in step SP101 according to the required determination accuracy and the like, and is set to a value of at least 51% or more.

According to the host device 2 according to this modification, the authenticity determination unit 50 creates a measured current value pattern by the pattern creating unit 53, and compares the measured current value pattern with the reference current value pattern by the pattern comparison unit 54. The processing is executed a plurality of N times for each period P12 and P13. Then, the memory is determined by whether or not the ratio of the measured current value pattern determined to match the reference current value pattern is equal to or greater than the second threshold value among the N times comparison processing performed by the pattern comparison unit 54. It is determined whether the device 3 is a genuine product or a non-genuine product. In this way, a series of processes by the pattern creation unit 53 and the pattern comparison unit 54 are repeatedly executed N times for each period P12 and P13, and the authenticity of the memory device 3 is based on the comparison result of N times by the pattern comparison unit 54. By performing the determination, it is possible to improve the determination accuracy.

<Modification example 3>
In the first embodiment, the authenticity determination unit 50 determines the authenticity of the memory device 3 based on the comparison result between the actually measured current value pattern and the reference current value pattern for each of the periods P12 and 13.

On the other hand, the authenticity determination unit 50 according to this modification has a comparison result between the measured representative value and the reference representative value instead of the comparison result between the measured current value pattern and the reference current value pattern for each period P12 and P13. Based on the above, the authenticity of the memory device 3 is determined. As described in the first embodiment, the maximum value, the minimum value, and the average value (reference representative value) of the current consumption values for each of the periods P12 and P13 are stored in the memory core 32 as a part of the expected value data 201. Has been done.

FIG. 11 is a diagram showing a function realized by the CPU 22 executing the program 101 shown in FIG. As shown in FIG. 11, the authenticity determination unit 50 functions as a period setting unit 51, a current value acquisition unit 52, a representative value calculation unit 55, and a representative value comparison unit 56.

The authenticity determination unit 50 according to this modification includes the first measured representative value measured by the current value measuring circuit 13 during the period P12 in which the memory controller 31 operates independently, and the first reference obtained in advance for the period P12. Compare with the representative value. Further, the authenticity determination unit 50 has a second measured representative value measured by the current value measuring circuit 13 during the period P13 in which the memory core 32 operates independently, and a second reference representative value previously obtained for the period P13. Compare with. Then, the authenticity determination unit 50 determines whether the memory device 3 is a genuine product or a non-genuine product based on these comparison results.

FIG. 12 is a diagram showing an example of the current consumption characteristics of the memory device 3. Similar to the first embodiment, in step SP101, the period setting unit 51 sets the periods P12 and P13 as the determination target periods. Further, in step SP101, the period setting unit 51 sets "comparison processing between the maximum value, the minimum value, and the average value" as the processing content of the authenticity determination to be executed in each period P12 and P13.

FIG. 13 is a flowchart showing the flow of the authenticity determination process of the memory device 3 by the host device 2. In step SP102, the reference representative values (reference maximum value, reference minimum value, and reference average value) for each period P12 and P13 and the data indicating the corresponding predetermined tolerance values are the desired expected value data 201. Is read from the memory core 32. These information are transmitted from the memory device 3 to the host device 2, decoded by the decoder 23, and then stored in the expected value storage memory 24.

In step SP301, the representative value calculation unit 55 obtains the actual measurement maximum value, the actual measurement minimum value, and the actual measurement average value based on the actual measurement current value X acquired by the current value acquisition unit 52 for each period P12 and P13.

In step SP302, the representative value comparison unit 56 acquires the reference representative values for each period P12 and P13 from the expected value storage memory 24.

In step SP303, the representative value comparison unit 56 allows whether or not the difference between the measured maximum value and the reference maximum value is less than or equal to the allowable error value for each period P12 and P13, and the difference between the measured minimum value and the reference minimum value is allowed. It is determined whether or not it is equal to or less than the error value, and whether or not the difference between the measured average value and the reference average value is equal to or less than the allowable error value.

The authenticity determination unit 50 determines that the memory device 3 is a genuine product when the difference between the above three representative values is equal to or less than the tolerance value for both the periods P12 and P13. On the other hand, when the difference between the representative values of any of the representative values exceeds the tolerance value for at least one of the periods P12 and P13, it is determined that the memory device 3 is a non-genuine product.

The calculation for finding the measured representative value, the calculation for finding the difference between the measured representative value and the reference representative value, and the calculation for whether or not the difference between the measured representative value and the reference representative value is less than or equal to the tolerance value are shown in the figure. It may be executed by the arithmetic unit 60 shown in 9. Further, instead of using all three measured representative values (maximum value, minimum value, and average value), some measured representative values may be used.

As described above, according to the host device 2 according to the present modification, the authenticity determination unit 50 stores the memory based on the comparison result between the measured representative value and the reference representative value by the representative value comparison unit 56 for each period P12 and P13. It is determined whether the device 3 is a genuine product or a non-genuine product. In this way, instead of comparing the measured current value pattern with the reference current value pattern, by comparing the measured representative value with the reference representative value, it is not necessary to create the measured current value pattern, and the reference current does not need to be created. Since it is not necessary to hold the value pattern, it is possible to easily execute the authenticity determination of the memory device 3.

Further, according to the host device 2 according to the present modification, the representative value calculation unit 55 calculates at least one of an average value, a maximum value, and a minimum value as actual measurement representative values. In this way, by using at least one of the average value, the maximum value, and the minimum value as the measured representative value, the measured representative value can be easily calculated.

<Embodiment 2>
In the present embodiment, the memory device 3 executes the authenticity determination of the host device 2, that is, the second information processing device such as the memory device 3 is the determination device, and the first information processing of the host device 2 or the like. A mode in which the device is a determination device will be described.

FIG. 14 is a diagram showing a simplified configuration of the host device 2. As shown in FIG. 14, the host device 2 is configured to include a SoC 11 and a memory interface 12 having different functions. A non-volatile storage unit 15 is connected to the SoC 11. Expected value data 202 is stored in the storage unit 15.

The SoC 11 includes a CPU 22, a command buffer 27, and a data buffer 28, which are connected to each other via a bus 21. Drive power is supplied to the SoC 11 and the memory interface 14 from the power supply VCS2 (power supply unit) via the resistance element R.

FIG. 15 is a diagram showing a simplified configuration of the memory device 3. As shown in FIG. 15, the memory device 3 includes a memory controller 31, a memory core 32, a current value measuring circuit 33, and an authentication control circuit 34. The memory controller 31 includes a host interface 41, a decoder 42, and a memory core interface 43. The current value measuring circuit 33 measures the current value of the current flowing from the power supply VCS2 to the SoC211 and the memory interface 14 by measuring the voltage across the resistance element R of the host device 2.

FIG. 16 is a diagram showing the configuration of the authentication control circuit 34. As shown in the connection relationship of FIG. 16, the authentication control circuit 34 is connected to each other via the bus 71, the CPU 72, the decoder 73, the expected value storage memory 74, the GPIO75, the power supply control unit 76, the ADC 77, and the like. It is configured to include a storage unit 78 such as a ROM or RAM. The program 102 is stored in the storage unit 78.

When the CPU 72 executes the program 102 read from the storage unit 78, the CPU 72 functions as an authenticity determination unit 50 for determining whether the host device 2 is a genuine product or a non-genuine product, as shown in FIG. .. In other words, the program 102 is a program for causing the computer mounted on the memory device 3 as the second information processing device to function as the authenticity determination unit 50.

The authenticity determination unit 50 according to the present embodiment has the first measured current value pattern measured by the current value measurement circuit 33 in the first determination target period in which the SoC 11 operates independently, and the first determination target period. Is compared with the first reference current value pattern obtained in advance. Further, the authenticity determination unit 50 determines in advance the second measured current value pattern measured by the current value measurement circuit 33 in the second determination target period in which the memory interface 14 operates independently, and the second determination target period. Compare with the obtained second reference current value pattern. Then, the authenticity determination unit 50 determines whether the host device 2 is a genuine product or a non-genuine product based on these comparison results.

With reference to FIG. 6, when the memory device 3 is connected to the host device 2, the CPU 72 (period setting unit 51) first sets a plurality of determination target periods for which the authenticity determination is executed in step SP101. In the example of the present embodiment, the period during which the SoC 11 is operating independently is set as the first determination target period, and the period during which the memory interface 14 is operating independently is set as the second determination target period. .. Further, the period setting unit 51 sets the processing contents of the authenticity determination to be executed for the first and second determination target periods, respectively. In the example of the present embodiment, "comparison processing between current value patterns" is set as the processing content of the authenticity determination for both the first and second determination target periods.

Next, in step SP102, the CPU 72 reads the desired expected value data 202 from the storage unit 15, and stores the expected value data 202 in the expected value storage memory 74. In the example of the present embodiment, since the processing content of the authenticity determination is set to "comparison processing between current value patterns for the first and second determination target periods", the first and second determinations are made. The reference current value pattern for the target period and the data indicating the predetermined tolerance values corresponding to each are read out from the storage unit 15 as the desired expected value data 202 and stored in the expected value storage memory 74.

Next, in step SP103, the CPU 72 drives the ADC 77 and operates the SoC 11 independently in the first determination target period. In the first determination target period, power is supplied from the power supply VCS2 to the SoC11 via the resistance element R. When the power is supplied from the power supply VCS2 to the SoC11, a current flows through the resistance element R. The current value measuring circuit 33 actually measures the current value of the current flowing from the power supply VCS2 to the SoC11 by sampling the voltage across the resistance element R at a predetermined sampling frequency.

Further, the CPU 72 operates the memory interface 14 independently in the second determination target period. In the second determination target period, power is supplied from the power supply VCS2 to the memory interface 14 via the resistance element R. When the power is supplied from the power supply VCS2 to the memory interface 14, a current flows through the resistance element R. The current value measuring circuit 33 actually measures the current value of the current flowing from the power supply VCC2 to the memory interface 14 by sampling the voltage across the resistance element R at a predetermined sampling frequency.

Next, in step SP104, the CPU 72 (pattern creation unit 53) arranges a plurality of measured current values sequentially acquired by the current value acquisition unit 52 in chronological order, thereby arranging the measured current values of the SoC 11 regarding the first determination target period. A pattern and a measured current value pattern of the memory interface 14 regarding the second determination target period are created.

Next, in step SP105, the CPU 72 (pattern comparison unit 54) reads and acquires the reference current value pattern and the data indicating the tolerance value from the expected value storage memory 74 for each of the first and second determination target periods. ..

Next, in step SP106, the CPU 72 (pattern comparison unit 54) determines the measured current value pattern created by the pattern creation unit 53 and the reference read from the expected value storage memory 74 for each of the first and second determination target periods. Compare with the current value pattern.

Next, in step SP107, the CPU 72 (authenticity determination unit 50) determines whether or not all the differences between the measured current value X and the reference current value Y are equal to or less than the tolerance values for each of the first and second determination target periods. Is determined. Then, the authenticity determination unit 50 determines that all the differences between the measured current value X and the reference current value Y are equal to or less than the permissible error values (that is, when they completely match) for both the first and second determination target periods. Determines that the host device 2 is a genuine product, and ends the authenticity determination process.

On the other hand, when at least one difference exceeds the tolerance value (that is, does not completely match) for each of the first and second determination target periods, the authenticity determination unit 50 indicates that the host device 2 is a non-genuine product. It is determined that there is, and the process for stopping the operation of the memory system 1 is started. For example, by setting a control command for stopping the power supply to the power control unit 76 in the GPIO 75, the power supply to the memory controller 31 is stopped.

As described above, according to the memory device 3 (information processing device) according to the present embodiment, the authenticity determination unit 50 is the current value measurement circuit 33 in the first determination target period in which the SoC11 (first processing circuit) operates. The first comparison between the first measured current value measured by (current measuring unit) and the first reference current value previously obtained for a genuine product or a non-genuine product for the first determination target period. The result, the second measured current value measured by the current value measuring circuit 33 in the second determination target period in which the memory interface 14 (second processing circuit) operates, and the genuine product with respect to the second determination target period. Alternatively, whether the host device 2 (determined device) is a genuine product or a non-genuine product based on the second comparison result with the second reference current value obtained in advance for the non-genuine product. To judge. Therefore, even if a non-genuine product that completely copies all the functions of the genuine product is manufactured, the power consumption characteristics of the genuine product and the non-genuine product are different due to differences in the device structure and manufacturing process. Due to the difference, the measured current value of the non-genuine product (or genuine product) does not match the reference current value of the genuine product (or non-genuine product). Therefore, the authenticity determination unit 50 can easily execute the authenticity determination of the host device 2. Moreover, since the authenticity determination is performed based on the current consumption characteristics of both the SoC 11 and the memory interface 14 having different functions, the authenticity determination unit 50 can execute the authenticity determination of the host device 2 with higher accuracy.

<Embodiment 3>
In the present embodiment, a mode in which the host device 2 itself executes the authenticity determination of the host device 2, that is, a mode in which the first information processing device such as the host device 2 is a determination device and a determination device will be described.

FIG. 17 is a diagram showing a simplified configuration of the host device 2. As shown in FIG. 17, the host device 2 includes a SoC 11, a power supply control unit 12, a current value measuring circuit 16, a memory interface 14, and a non-volatile storage unit 15. Expected value data 203 is stored in the storage unit 15.

The SoC 11 includes a CPU 22, a decoder 23, an expected value storage memory 24, a GPIO 25, an ADC 26, a command buffer 27, a data buffer 28, and a storage unit 29 such as a ROM or RAM, which are connected to each other via a bus 21. It is composed of. The program 103 is stored in the storage unit 29. Drive power is supplied to the SoC 11 and the memory interface 14 from the power supply VCS3 (power supply unit) via the resistance element R. The current value measuring circuit 16 measures the current value of the current flowing from the power supply VCS3 to the SoC211 and the memory interface 14 by measuring the voltage across the resistance element R.

When the CPU 22 executes the program 103 read from the storage unit 29, the CPU 22 functions as an authenticity determination unit 50 for determining whether the host device 2 is a genuine product or a non-genuine product, as shown in FIG. .. In other words, the program 103 is a program for causing the computer mounted on the host device 2 as the first information processing device to function as the authenticity determination unit 50.

The authenticity determination unit 50 according to the present embodiment includes a first measured current value pattern measured by the current value measurement circuit 16 in the first determination target period in which the SoC 11 operates independently, and the first determination target period. Is compared with the first reference current value pattern obtained in advance. Further, the authenticity determination unit 50 determines in advance the second measured current value pattern measured by the current value measurement circuit 16 in the second determination target period in which the memory interface 14 operates independently, and the second determination target period. Compare with the obtained second reference current value pattern. Then, the authenticity determination unit 50 determines whether the host device 2 is a genuine product or a non-genuine product based on these comparison results.

When the memory device 3 is connected to the host device 2 with reference to FIG. 6, first, in step SP101, the CPU 22 (period setting unit 51) sets a plurality of determination target periods to be executed for the authenticity determination. In the example of the present embodiment, the period during which the SoC 11 is operating independently is set as the first determination target period, and the period during which the memory interface 14 is operating independently is set as the second determination target period. .. Further, the period setting unit 51 sets the processing contents of the authenticity determination to be executed for the first and second determination target periods, respectively. In the example of the present embodiment, "comparison processing between current value patterns" is set as the processing content of the authenticity determination for both the first and second determination target periods.

Next, in step SP 102, the CPU 22 reads the desired expected value data 203 from the storage unit 15, and stores the expected value data 202 in the expected value storage memory 24. In the example of the present embodiment, since the processing content of the authenticity determination is set to "comparison processing between current value patterns for the first and second determination target periods", the first and second determinations are made. The reference current value pattern for the target period and the data indicating the predetermined tolerance values corresponding to each are read out from the storage unit 15 as the desired expected value data 203 and stored in the expected value storage memory 24.

Next, in step SP103, the CPU 22 drives the ADC 26 and operates the SoC11 independently in the first determination target period. In the first determination target period, power is supplied from the power supply VCS3 to the SoC11 via the resistance element R. When the power is supplied from the power supply VCS3 to the SoC11, a current flows through the resistance element R. The current value measuring circuit 16 actually measures the current value of the current flowing from the power supply VCS3 to the SoC11 by sampling the voltage across the resistance element R at a predetermined sampling frequency.

Further, the CPU 22 operates the memory interface 14 independently in the second determination target period. In the second determination target period, power is supplied from the power supply VCS3 to the memory interface 14 via the resistance element R. When the power is supplied from the power supply VCS3 to the memory interface 14, a current flows through the resistance element R. The current value measuring circuit 16 actually measures the current value of the current flowing from the power supply VCC3 to the memory interface 14 by sampling the voltage across the resistance element R at a predetermined sampling frequency.

Next, in step SP104, the CPU 22 (pattern creation unit 53) arranges a plurality of measured current values sequentially acquired by the current value acquisition unit 52 in chronological order, thereby arranging the measured current values of the SoC 11 regarding the first determination target period. A pattern and a measured current value pattern of the memory interface 14 regarding the second determination target period are created.

Next, in step SP105, the CPU 22 (pattern comparison unit 54) reads and acquires the reference current value pattern and the data indicating the tolerance value from the expected value storage memory 24 for each of the first and second determination target periods. ..

Next, in step SP106, the CPU 22 (pattern comparison unit 54) determines the measured current value pattern created by the pattern creation unit 53 and the reference read from the expected value storage memory 24 for each of the first and second determination target periods. Compare with the current value pattern.

Next, in step SP107, the CPU 22 (authenticity determination unit 50) determines whether or not all the differences between the measured current value X and the reference current value Y are equal to or less than the tolerance values for each of the first and second determination target periods. Is determined. Then, the authenticity determination unit 50 determines that all the differences between the measured current value X and the reference current value Y are equal to or less than the permissible error values (that is, when they completely match) for both the first and second determination target periods. Determines that the host device 2 is a genuine product, and ends the authenticity determination process.

On the other hand, when at least one difference exceeds the tolerance value (that is, does not completely match) for each of the first and second determination target periods, the authenticity determination unit 50 indicates that the host device 2 is a non-genuine product. It is determined that there is, and the process for stopping the operation of the memory system 1 is started. For example, by setting a control command for stopping the power supply to the power control unit 12 in the GPIO 25, the power supply to the memory device 3 is stopped.

As described above, according to the host device 2 (information processing device) according to the present embodiment, the authenticity determination unit 50 is the current value measurement circuit 16 in the first determination target period in which the SoC 11 (first processing circuit) operates. The first comparison between the first measured current value measured by (current measuring unit) and the first reference current value previously obtained for a genuine product or a non-genuine product for the first determination target period. The result, the second measured current value measured by the current value measuring circuit 16 in the second determination target period in which the memory interface 14 (second processing circuit) operates, and the genuine product with respect to the second determination target period. Alternatively, whether the host device 2 (determined device) is a genuine product or a non-genuine product based on the second comparison result with the second reference current value obtained in advance for the non-genuine product. To judge. Therefore, even if a non-genuine product that completely copies all the functions of the genuine product is manufactured, the power consumption characteristics of the genuine product and the non-genuine product are different due to differences in the device structure and manufacturing process. Due to the difference, the measured current value of the non-genuine product (or genuine product) does not match the reference current value of the genuine product (or non-genuine product). Therefore, the authenticity determination unit 50 can easily execute the authenticity determination of the host device 2. Moreover, since the authenticity determination is performed based on the current consumption characteristics of both the SoC 11 and the memory interface 14 having different functions, the authenticity determination unit 50 can execute the authenticity determination of the host device 2 with higher accuracy.

<Embodiment 4>
In the present embodiment, a mode in which the memory device 3 itself executes the authenticity determination of the memory device 3, that is, a mode in which the second information processing device such as the memory device 3 is a determination device and a determination device will be described.

FIG. 18 is a diagram showing a simplified configuration of the memory device 3. As shown in FIG. 18, the memory device 3 includes a memory controller 31, a memory core 32, a current value measuring circuit 33, and an authentication control circuit 34. Drive power is supplied to the memory controller 31 and the memory core 32 from the power supply VCS4 (power supply unit) via the resistance element R. The current value measuring circuit 33 measures the current value of the current flowing from the power supply VCC4 to the memory controller 31 and the memory core 32 by measuring the voltage across the resistance element R. Expected value data 204 is stored in the memory core 32.

FIG. 19 is a diagram showing the configuration of the authentication control circuit 34. As shown in the connection relationship of FIG. 19, the authentication control circuit 34 is connected to each other via the bus 71, the CPU 72, the decoder 73, the expected value storage memory 74, the GPIO75, the power supply control unit 76, the ADC 77, and the like. It is configured to include a storage unit 78 such as a ROM or RAM. The program 104 is stored in the storage unit 78.

When the CPU 72 executes the program 104 read from the storage unit 78, the CPU 72 functions as an authenticity determination unit 50 for determining whether the memory device 3 is a genuine product or a non-genuine product, as shown in FIG. .. In other words, the program 104 is a program for causing the computer mounted on the memory device 3 as the second information processing device to function as the authenticity determination unit 50.

The authenticity determination unit 50 according to the present embodiment includes a first measured current value pattern measured by the current value measurement circuit 33 during the first determination target period in which the memory controller 31 operates independently, and the first determination. Compare with the first reference current value pattern obtained in advance for the target period. Further, the authenticity determination unit 50 determines in advance the second measured current value pattern measured by the current value measurement circuit 33 in the second determination target period in which the memory core 32 operates independently, and the second determination target period. Compare with the obtained second reference current value pattern. Then, the authenticity determination unit 50 determines whether the memory device 3 is a genuine product or a non-genuine product based on these comparison results.

With reference to FIG. 6, when the memory device 3 is connected to the host device 2, the CPU 72 (period setting unit 51) first sets a plurality of determination target periods for which the authenticity determination is executed in step SP101. In the example of the present embodiment, the period in which the memory controller 31 is operating independently is set as the first determination target period, and the period in which the memory core 32 is operating independently is set as the second determination target period. Will be done. Further, the period setting unit 51 sets the processing contents of the authenticity determination to be executed for the first and second determination target periods, respectively. In the example of the present embodiment, "comparison processing between current value patterns" is set as the processing content of the authenticity determination for both the first and second determination target periods.

Next, in step SP 102, the CPU 72 reads the desired expected value data 204 from the memory core 32, and stores the expected value data 204 in the expected value storage memory 74. In the example of the present embodiment, since the processing content of the authenticity determination is set to "comparison processing between current value patterns for the first and second determination target periods", the first and second determinations are made. The reference current value pattern for the target period and the data indicating the predetermined tolerance values corresponding to each are read out from the memory core 32 as the desired expected value data 204 and stored in the expected value storage memory 74.

Next, in step SP103, the CPU 72 drives the ADC 77 and operates the memory controller 31 independently in the first determination target period. In the first determination target period, power is supplied from the power supply VCS4 to the memory controller 31 via the resistance element R. When the power is supplied from the power supply VCS4 to the memory controller 31, a current flows through the resistance element R. The current value measuring circuit 33 actually measures the current value of the current flowing from the power supply VCS 4 to the memory controller 31 by sampling the voltage across the resistance element R at a predetermined sampling frequency.

Further, the CPU 72 operates the memory core 32 independently in the second determination target period. In the second determination target period, power is supplied from the power supply VCS4 to the memory core 32 via the resistance element R. When the power is supplied from the power supply VCS4 to the memory core 32, a current flows through the resistance element R. The current value measuring circuit 33 actually measures the current value of the current flowing from the power supply VCS 4 to the memory core 32 by sampling the voltage across the resistance element R at a predetermined sampling frequency.

Next, in step SP104, the CPU 72 (pattern creation unit 53) arranges a plurality of measured current values sequentially acquired by the current value acquisition unit 52 in chronological order, thereby measuring the actual measurement of the memory controller 31 with respect to the first determination target period. A current value pattern and an actually measured current value pattern of the memory core 32 regarding the second determination target period are created.

Next, in step SP105, the CPU 72 (pattern comparison unit 54) reads and acquires the reference current value pattern and the data indicating the tolerance value from the expected value storage memory 74 for each of the first and second determination target periods. ..

Next, in step SP106, the CPU 72 (pattern comparison unit 54) determines the measured current value pattern created by the pattern creation unit 53 and the reference read from the expected value storage memory 74 for each of the first and second determination target periods. Compare with the current value pattern.

Next, in step SP107, the CPU 72 (authenticity determination unit 50) determines whether or not all the differences between the measured current value X and the reference current value Y are equal to or less than the tolerance values for each of the first and second determination target periods. Is determined. Then, the authenticity determination unit 50 determines that all the differences between the measured current value X and the reference current value Y are equal to or less than the permissible error values (that is, when they are exactly the same) for both the first and second determination target periods. Determines that the memory device 3 is a genuine product, and ends the authenticity determination process.

On the other hand, when at least one difference exceeds the tolerance value (that is, does not completely match) for each of the first and second determination target periods, the authenticity determination unit 50 indicates that the memory device 3 is a non-genuine product. It is determined that there is, and the process for stopping the operation of the memory system 1 is started. For example, by setting a control command for stopping the power supply to the power control unit 76 in the GPIO 75, the power supply to the memory controller 31 is stopped.

As described above, according to the memory device 3 (information processing device) according to the present embodiment, the authenticity determination unit 50 measures the current value in the first determination target period in which the memory controller 31 (first processing circuit) operates. The first of the first measured current value measured by the circuit 33 (current measuring unit) and the first reference current value obtained in advance for a genuine product or a non-genuine product for the first determination target period. With respect to the comparison result of the above, the second measured current value measured by the current value measuring circuit 33 in the second determination target period in which the memory core 32 (second processing circuit) operates, and the second determination target period. Based on the second comparison result with the second reference current value obtained in advance for the genuine product or the non-genuine product, the memory device 3 (determined device) is a genuine product or a non-genuine product. Determine if there is. Therefore, even if a non-genuine product that completely copies all the functions of the genuine product is manufactured, the power consumption characteristics of the genuine product and the non-genuine product are different due to differences in the device structure and manufacturing process. Due to the difference, the measured current value of the non-genuine product (or genuine product) does not match the reference current value of the genuine product (or non-genuine product). Therefore, the authenticity determination unit 50 can easily execute the authenticity determination of the memory device 3. Moreover, since the authenticity determination is performed based on the current consumption characteristics of both the memory controller 31 and the memory core 32 having different functions, the authenticity determination unit 50 can execute the authenticity determination of the memory device 3 with higher accuracy. ..

2 Host device 3 Memory device 11 SoC
12 Power control unit 13, 33 Current value measurement circuit 14 Memory interface 22, 72 CPU
31 Memory controller 32 Memory core 34 Authentication control circuit 50 Authenticity judgment unit 51 Period setting unit 52 Current value acquisition unit 53 Pattern creation unit 54 Pattern comparison unit 55 Representative value calculation unit 56 Representative value comparison unit 101-104 Program 201-204 Expected data

Claims (17)

An information processing device having an authenticity determination function of a determination device having a first processing circuit and a second processing circuit having different functions.
A power supply unit that supplies power to the first processing circuit and the second processing circuit,
A current measuring unit that measures the current flowing from the power supply unit to the first processing circuit and the second processing circuit, and
A determination unit that determines whether the device to be determined is a genuine product or a non-genuine product,
With
The determination unit
The first measured current value measured by the current measuring unit in the first period in which the first processing circuit operates, and the first measured value obtained in advance for a genuine product or a non-genuine product in the first period. The first comparison result with the reference current value of 1 and
The second measured current value measured by the current measuring unit in the second period in which the second processing circuit operates, and the second measured in advance for the genuine or non-genuine product in the second period. The second comparison result with the reference current value of 2 and
An information processing device that determines whether the device to be determined is a genuine product or a non-genuine product based on the above. The device is provided with an authenticity determination function of a device to be determined, which has a first processing circuit and a second processing circuit having different functions, and a power supply unit for supplying power to the first processing circuit and the second processing circuit. It is an information processing device
A current measuring unit that measures the current flowing from the power supply unit to the first processing circuit and the second processing circuit, and
A determination unit that determines whether the device to be determined is a genuine product or a non-genuine product,
With
The determination unit
The first measured current value measured by the current measuring unit in the first period in which the first processing circuit operates, and the first measured value obtained in advance for a genuine product or a non-genuine product in the first period. The first comparison result with the reference current value of 1 and
The second measured current value measured by the current measuring unit in the second period in which the second processing circuit operates, and the second measured in advance for the genuine or non-genuine product in the second period. The second comparison result with the reference current value of 2 and
An information processing device that determines whether the device to be determined is a genuine product or a non-genuine product based on the above. An information processing device that has an authenticity judgment function that uses itself as the judgment device.
A first processing circuit and a second processing circuit having different functions,
A power supply unit that supplies power to the first processing circuit and the second processing circuit,
A current measuring unit that measures the current flowing from the power supply unit to the first processing circuit and the second processing circuit, and
A determination unit that determines whether the device to be determined is a genuine product or a non-genuine product,
With
The determination unit
The first measured current value measured by the current measuring unit in the first period in which the first processing circuit operates, and the first measured value obtained in advance for a genuine product or a non-genuine product in the first period. The first comparison result with the reference current value of 1 and
The second measured current value measured by the current measuring unit in the second period in which the second processing circuit operates, and the second measured in advance for the genuine or non-genuine product in the second period. The second comparison result with the reference current value of 2 and
An information processing device that determines whether the device to be determined is a genuine product or a non-genuine product based on the above. The determination unit
A current value acquisition unit that acquires a plurality of measured current values measured by the current measurement unit at a plurality of measurement timings from the current measurement unit, and a current value acquisition unit.
A pattern creation unit that creates an actual measurement current value pattern by arranging a plurality of actual measurement current values acquired by the current value acquisition unit in chronological order.
A pattern comparison unit that compares the measured current value pattern created by the pattern creation unit with a reference current value pattern that is a reference current value pattern previously obtained for a genuine product or a non-genuine product.
The information processing apparatus according to any one of claims 1 to 3. The pattern comparison unit compares a plurality of measured current values constituting the measured current value pattern with a plurality of reference current values constituting the reference current value pattern, respectively.
According to claim 4, the determination unit determines whether the device to be determined is a genuine product or a non-genuine product depending on whether or not all the measured current values match the corresponding reference current values. The information processing device described. The pattern comparison unit compares a plurality of measured current values constituting the measured current value pattern with a plurality of reference current values constituting the reference current value pattern, respectively.
In the determination unit, the determination device is a genuine product depending on whether or not the ratio of the measured current value that matches the corresponding reference current value among all the measured current values is equal to or higher than the first threshold value. The information processing apparatus according to claim 4, wherein it determines whether the product is a non-genuine product. The determination unit
The pattern creation unit creates the measured current value pattern, and the pattern comparison unit executes the comparison process between the measured current value pattern and the reference current value pattern N times (N is a plurality of times).
Of the N times of comparison processing by the pattern comparison unit, the ratio of the measured current value pattern determined to match the reference current value pattern is equal to or greater than the second threshold value. The information processing device according to any one of claims 4 to 6, which determines whether the device is a genuine product or a non-genuine product. The determination unit
A current value acquisition unit that acquires a plurality of measured current values measured by the current measurement unit at a plurality of measurement timings from the current measurement unit, and a current value acquisition unit.
A representative value calculation unit that calculates a predetermined measured representative value based on a plurality of measured current values acquired by the current value acquisition unit, and a representative value calculation unit.
A representative value comparison unit that compares the actually measured representative value calculated by the representative value calculation unit with the reference representative value, which is a representative value previously obtained for a genuine product or a non-genuine product.
The information processing apparatus according to any one of claims 1 to 3. The information processing apparatus according to claim 8, wherein the representative value calculation unit calculates at least one of an average value, a maximum value, and a minimum value as actual measurement representative values. The information processing device according to any one of claims 1 to 9, wherein the determination unit further includes a period setting unit that variably sets the first period and the second period. The determination device further includes a storage unit that stores the first reference current value and the second reference current value.
The information processing device according to any one of claims 1 to 10, wherein the determination unit reads out the first reference current value and the second reference current value from the storage unit. A power supply unit that supplies power to a first processing circuit and a second processing circuit having different functions of the device to be determined, and a current flowing from the power supply unit to the first processing circuit and the second processing circuit. It is a program for making a computer mounted on an information processing apparatus including a current measuring unit for measuring a device function as a determining means for determining whether the device to be determined is a genuine product or a non-genuine product. ,
The determination means
The first measured current value measured by the current measuring unit in the first period in which the first processing circuit operates, and the first measured value obtained in advance for a genuine product or a non-genuine product in the first period. The first comparison result with the reference current value of 1 and
The second measured current value measured by the current measuring unit in the second period in which the second processing circuit operates, and the second measured in advance for the genuine or non-genuine product in the second period. The second comparison result with the reference current value of 2 and
A program for determining whether the device to be determined is a genuine product or a non-genuine product based on the above. It is provided with an authenticity determination function of a device to be determined, which has a first processing circuit and a second processing circuit having different functions, and a power supply unit for supplying power to the first processing circuit and the second processing circuit. Whether the device to be determined is a genuine product or not is a computer mounted on an information processing device including a current measuring unit that measures a current flowing from the power supply unit to the first processing circuit and the second processing circuit. It is a program to function as a judgment means to judge whether it is a genuine product.
The determination means
The first measured current value measured by the current measuring unit in the first period in which the first processing circuit operates, and the first measured value obtained in advance for a genuine product or a non-genuine product in the first period. The first comparison result with the reference current value of 1 and
The second measured current value measured by the current measuring unit in the second period in which the second processing circuit operates, and the second measured in advance for the genuine or non-genuine product in the second period. The second comparison result with the reference current value of 2 and
A program for determining whether the device to be determined is a genuine product or a non-genuine product based on the above. A power supply unit that has an authenticity determination function that uses itself as a determination device and supplies power to the first processing circuit and the second processing circuit having different functions, and the first processing circuit and the second processing circuit. A computer mounted on an information processing device including a current measuring unit for measuring a current flowing from the power supply unit to the first processing circuit and the second processing circuit is a genuine product. It is a program for functioning as a judgment means for determining whether the product is a non-genuine product or not.
The determination means
The first measured current value measured by the current measuring unit in the first period in which the first processing circuit operates, and the first measured value obtained in advance for a genuine product or a non-genuine product in the first period. The first comparison result with the reference current value of 1 and
The second measured current value measured by the current measuring unit in the second period in which the second processing circuit operates, and the second measured in advance for the genuine or non-genuine product in the second period. The second comparison result with the reference current value of 2 and
A program for determining whether the device to be determined is a genuine product or a non-genuine product based on the above. A power supply unit that supplies power to a first processing circuit and a second processing circuit having different functions of the device to be determined, and a current flowing from the power supply unit to the first processing circuit and the second processing circuit. A method for determining the authenticity of a device to be determined, which determines whether the device to be determined is a genuine product or a non-genuine product in an information processing device including a current measuring unit for measuring.
The first measured current value measured by the current measuring unit in the first period in which the first processing circuit operates, and the first measured value obtained in advance for a genuine product or a non-genuine product in the first period. The first comparison result with the reference current value of 1 and
The second measured current value measured by the current measuring unit in the second period in which the second processing circuit operates, and the second measured in advance for the genuine or non-genuine product in the second period. The second comparison result with the reference current value of 2 and
A method for determining authenticity of a device to be determined, comprising a step of determining whether the device to be determined is a genuine product or a non-genuine product based on the above. It is provided with an authenticity determination function of a device to be determined, which has a first processing circuit and a second processing circuit having different functions, and a power supply unit for supplying power to the first processing circuit and the second processing circuit. In an information processing device including a current measuring unit that measures a current flowing from the power supply unit to the first processing circuit and the second processing circuit, whether the determined device is a genuine product or a non-genuine product. It is a method of determining the authenticity of the device to be determined, which determines
The first measured current value measured by the current measuring unit in the first period in which the first processing circuit operates, and the first measured value obtained in advance for a genuine product or a non-genuine product in the first period. The first comparison result with the reference current value of 1 and
The second measured current value measured by the current measuring unit in the second period in which the second processing circuit operates, and the second measured in advance for the genuine or non-genuine product in the second period. The second comparison result with the reference current value of 2 and
A method for determining authenticity of a device to be determined, comprising a step of determining whether the device to be determined is a genuine product or a non-genuine product based on the above. A power supply unit that has an authenticity determination function that uses itself as a determination device and supplies power to the first processing circuit and the second processing circuit having different functions, and the first processing circuit and the second processing circuit. In an information processing device including a current measuring unit for measuring a current flowing from the power supply unit to the first processing circuit and the second processing circuit, whether the determined device is a genuine product or not. It is a method of determining the authenticity of the device to be determined, which determines whether the product is a product.
The first measured current value measured by the current measuring unit in the first period in which the first processing circuit operates, and the first measured value obtained in advance for a genuine product or a non-genuine product in the first period. The first comparison result with the reference current value of 1 and
The second measured current value measured by the current measuring unit in the second period in which the second processing circuit operates, and the second measured in advance for the genuine or non-genuine product in the second period. The second comparison result with the reference current value of 2 and
A method for determining authenticity of a device to be determined, comprising a step of determining whether the device to be determined is a genuine product or a non-genuine product based on the above.

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