JP6675024B1 - Information processing device, program, and method of determining authenticity of device to be determined - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an information processing device capable of easily and highly accurately executing authenticity determination as to whether a device to be judged is a genuine product or a non-genuine product. An authenticity determination unit (50) determines a first actually measured current value measured by a current value measurement circuit (13) in a first period (P12) during which a memory controller (31) operates, and a genuine product or a non-authorized product regarding the first period (P12). A first comparison result with a first reference current value obtained in advance for a genuine product, and a second measured current measured by the current value measurement circuit 13 in the second period P13 in which the memory core 32 operates. The memory device 3 is a genuine product based on the second comparison result of the value and the second reference current value obtained in advance for the genuine product or the non-genuine product in the second period P13. Or non-genuine product. [Selection diagram] FIG.

Description

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

  Japanese Patent Application Laid-Open No. H11-163,087 discloses a memory system including a host device and a memory device connected to the host device, which measures current consumption flowing from the host device to the memory device, and calculates a change per unit time of the current consumption. It is determined whether the memory device is a genuine product by calculating the rate of change and comparing the current consumption change rate pattern created for the memory device with the current consumption change rate pattern for a genuine product. A memory system is disclosed.

Japanese Patent No. 6068878

  As a technique for protecting content data stored in a memory device, modern encryption such as AES or RSA is generally used. However, if confidential information such as a secret key is determined by an analysis of a third party, there is a problem that an unauthorized product in which all functions of the authorized product are completely copied is easily manufactured.

  Patent Document 1 discloses only an aspect in which the host device performs the authenticity determination of the memory device. However, the form of unauthorized use is not limited to the case where a non-genuine memory device is used, and a non-genuine host device is used for the purpose of illegally copying content data stored in the non-genuine memory device. May be used. Therefore, in order to appropriately protect the content data from unauthorized copying or the like, it is necessary to stop the operation of the memory system when the host device is a non-genuine product. For this purpose, the memory device has a function of determining whether or not the host device is a genuine product, and each of the host device and the memory device determines whether or not itself is a genuine product (self-authentication determination). Function is desired.

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

  An information processing apparatus according to a first aspect of the present invention is an information processing apparatus having an authenticity determination function of a device to be determined having a first processing circuit and a second processing circuit having different functions. A power supply unit that supplies power to the processing circuit and the second processing circuit; a current measurement unit that measures a current flowing from the power supply unit to the first processing circuit and the second processing circuit; A determination unit that determines whether the device to be determined is a genuine product or a non-genuine product, wherein the determination unit measures the current measurement unit during a first period in which the first processing circuit operates. A first comparison result between the obtained first actually measured current value and a 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 Operates in the second period during which the current measurement unit operates. Based on a second actually measured current value measured in the second period and a second comparison current value with a second reference current value obtained in advance for a genuine product or a 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.

  According to the information processing apparatus according to the first aspect, the determination unit is configured to determine the first measured current value measured by the current measurement unit during the first period in which the first processing circuit operates, and the first period And a first comparison result with a first reference current value obtained in advance for a genuine product or a non-genuine product, and a second comparison result measured by a current measurement unit in a second period in which the second processing circuit operates. 2 based on the actually measured current value of the second device and a second comparison result of the second reference current value obtained in advance for the genuine product or the non-genuine product for the second period. It is determined whether the product is non-genuine or non-genuine. Therefore, even if a non-genuine product in which all functions of the genuine product are completely copied 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. Because of 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 determining unit. 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 determination unit can perform the authentication determination of the device to be determined with higher accuracy. Becomes

  An information processing apparatus according to a second aspect of the present invention includes a first processing circuit and a second processing circuit having different functions, and a power supply for supplying power to the first processing circuit and the second processing circuit. An information processing device having an authenticity determination function of a device to be determined having a unit, a current measurement unit that measures a current flowing from the power supply unit to the first processing circuit and the second processing circuit, A determination unit for determining whether the device to be determined is a genuine product or a non-genuine product, wherein the determination unit performs a first period in which the first processing circuit operates by the current measurement unit. A first comparison result between the measured first actually measured current value and a first reference current value obtained in advance for a genuine product or a non-genuine product for the first period, and the second processing In the second period in which the circuit operates, the current measuring unit Based on the second measured current value measured in the second period and a second comparison current value obtained in advance for the second period with respect to a genuine product or a non-genuine product using a second reference current value. And determining 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 is configured to determine the first measured current value measured by the current measurement unit during the first period in which the first processing circuit operates, and the first period And a first comparison result with a first reference current value obtained in advance for a genuine product or a non-genuine product, and a second comparison result measured by a current measurement unit in a second period in which the second processing circuit operates. 2 based on the actually measured current value of the second device and a second comparison result of the second reference current value obtained in advance for the genuine product or the non-genuine product for the second period. It is determined whether the product is non-genuine or non-genuine. Therefore, even if a non-genuine product in which all functions of the genuine product are completely copied 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. Because of 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 determining unit. 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 determination unit can perform the authentication determination of the device to be determined with higher accuracy. Becomes

  An information processing device according to a third aspect of the present invention is an information processing device including an authentication determination function using itself as a device to be determined, 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 measurement unit that measures a current flowing from the power supply unit to the first processing circuit and the second processing circuit. And a determining unit for determining whether the device to be determined is a genuine product or a non-genuine product, wherein the determining unit performs the current measurement in a first period in which the first processing circuit operates. A first comparison result between a first actually measured current value measured by the first unit and a first reference current value previously obtained for a genuine product or a non-genuine product for the first period; Measuring the current during a second period in which the processing circuit of FIG. Based on a second measured current value measured by a second comparison current value and a second reference current value obtained in advance for a genuine product or a 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.

  According to the information processing apparatus according to the third aspect, the determination unit is configured to determine the first measured current value measured by the current measurement unit during the first period in which the first processing circuit operates, and the first period And a first comparison result with a first reference current value obtained in advance for a genuine product or a non-genuine product, and a second comparison result measured by a current measurement unit in a second period in which the second processing circuit operates. 2 based on the actually measured current value of the second device and a second comparison result of the second reference current value obtained in advance for the genuine product or the non-genuine product for the second period. It is determined whether the product is non-genuine or non-genuine. Therefore, even if a non-genuine product in which all functions of the genuine product are completely copied 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. Because of 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 determining unit. 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 determination unit can perform the authentication determination of the device to be determined with higher accuracy. Becomes

  An information processing device according to a fourth aspect of the present invention is the information processing device according to any one of the first to third aspects, in which the determination unit is measured by the current measurement unit at a plurality of measurement timings. A plurality of actually measured current values, a current value acquisition unit that acquires from the current measurement unit, and a plurality of actually measured current values that are acquired by the current value acquisition unit are arranged in chronological order to create an actually measured current value pattern. And a pattern comparison unit that compares a measured current value pattern created by the pattern creation unit with a reference current value pattern that is a pattern of a reference current value previously obtained for a 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 a comparison result between the actually 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 the non-genuine product is often larger than that of the genuine product. According to the information processing apparatus of the fourth aspect, the determination unit compares the measured current value pattern with the reference current value pattern instead of the current consumption change rate pattern. Even if the current rate-of-change patterns are close to each other, the authenticity of the device to be determined can be determined with high accuracy.

  An information processing apparatus according to a fifth aspect of the present invention is the information processing apparatus according to the fourth aspect, in which the pattern comparison unit includes a plurality of measured current values forming a measured current value pattern and a reference current value pattern. Respectively, and the determination unit determines whether or not the measured device is a genuine product based on whether or not all measured current values match the corresponding reference current values. It is characterized in that it is determined whether or not it is an irregular product.

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

  An information processing apparatus according to a sixth aspect of the present invention is the information processing apparatus according to the fourth aspect, in which the pattern comparison unit includes a plurality of measured current values forming a measured current value pattern and a reference current value pattern. Respectively, 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 greater than the first threshold value. Whether the device to be determined is a genuine product or a non-genuine product is determined depending on whether or not the device is a genuine product.

  According to the information processing apparatus according to the sixth aspect, the determination unit determines whether the ratio of the measured current value that matches the corresponding reference current value among all the measured current values is equal to or greater than the first threshold value. It is determined whether the device to be determined is a genuine product or a non-genuine product. Therefore, even if the measured current value of the genuine product (or the non-genuine product) instantaneously increases or decreases due to sudden noise or the like, the genuine product (or the non-genuine product) erroneously changes to the non-genuine product ( Or a genuine product).

  An information processing apparatus according to a seventh aspect of the present invention is the information processing apparatus according to any one of the fourth to sixth aspects, in which the determination unit performs a process of creating an actually measured current value pattern by the pattern creation unit. And the comparison process between the measured current value pattern and the reference current value pattern by the pattern comparing unit is performed N times (N is plural), and among the N comparison processes by the pattern comparing unit, the measured current value pattern is Determining whether the device to be determined is a genuine product or a non-genuine product, based on whether or not the ratio determined to match the reference current value pattern is equal to or greater than a second threshold value. It is a feature.

  According to the information processing apparatus according to the seventh aspect, the determination unit performs 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 performs the N comparison processes by the pattern comparison unit. The device to be determined is a genuine product or a non-genuine product depending on whether or not the ratio of the measured current value pattern matching the reference current value pattern is equal to or more than the second threshold value. It is determined whether there is. As described above, a series of processes by the pattern creating unit and the pattern comparing unit are repeatedly performed a plurality of N times, and the authenticity of the device to be determined is determined based on the comparison results of the N times by the pattern comparing unit. It is possible to improve.

  The information processing device according to an eighth aspect of the present invention is the information processing device according to any one of the first to third aspects, in which the determination unit is measured by the current measurement unit at a plurality of measurement timings. A plurality of actually measured current values, a current value acquisition unit that acquires from the current measurement unit, and a representative value calculation that calculates a predetermined actually measured representative value based on the plurality of actually measured current values that are acquired by the current value acquisition unit. And a representative value comparison unit that compares a 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. It is assumed that.

  According to the information processing apparatus according to the eighth aspect, the determination unit is configured to perform the determination based on a comparison result between the measured representative value calculated by the representative value calculation unit and the reference representative value obtained in advance for the genuine product or the non-genuine product. Then, it is determined whether the device to be determined is a genuine product or a non-genuine product. Accordingly, there is no need to create an actually 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 performed.

  In the information processing apparatus according to a ninth aspect of the present invention, in the information processing apparatus according to the eighth aspect, in particular, the representative value calculation unit determines at least one of an average value, a maximum value, and a minimum value as a measured representative value. Is calculated.

  According to the information processing apparatus of the ninth aspect, the representative value calculation unit calculates at least one of the average value, the maximum value, and the minimum value as the measured representative value. 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.

  In the information processing apparatus according to a tenth aspect of the present invention, in the information processing apparatus according to any one of the first to ninth aspects, in particular, the determination unit determines the first period and the second period. It is characterized by further including a period setting unit variably set.

  According to the information processing apparatus of 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 device to be determined is to be authenticated can be statically or dynamically changed by the period setting unit, which makes it more difficult for a third party to analyze the determination algorithm. It is possible to do.

  An information processing apparatus according to an eleventh aspect of the present invention is the information processing apparatus according to any one of the first to tenth aspects, in particular, wherein the determined device includes the first reference current value and the second reference current value. And a storage unit that stores the reference current values of the first and second reference current values. The determination unit reads the first reference current value and the second reference current value from the storage unit.

  According to the information processing apparatus of the eleventh aspect, the first reference current value and the second reference current value are stored in the storage unit of the device to be determined. Since the reference current value of the device to be determined depends on the structure of the device, the manufacturing process, and the like, 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 a different reference current value for each device.

  A program according to a 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 a device to be determined; A computer mounted on an information processing apparatus including a processing circuit and a current measuring unit for measuring a current flowing through the second processing circuit, determining whether the device to be determined is a genuine product or an unauthorized product A program for causing the first processing circuit to operate, wherein the determining unit determines a first measured current value measured by the current measuring unit during a first period in which the first processing circuit operates, and A first comparison result with a first reference current value obtained in advance for a genuine product or a non-genuine product for the first period, and the current measurement unit in a second period in which the second processing circuit operates. By Based on a second measured current value determined and a second comparison result of a second reference current value previously obtained for a genuine product or a 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.

  According to the program of the twelfth aspect, the determination unit is configured to determine that the first measured current value measured by the current measurement unit during the first period in which the first processing circuit operates and the normal value with respect to the first period. A first comparison result with a first reference current value obtained in advance for a non-genuine product or a non-genuine product, and a second comparison result measured by the current measurement unit during a second period in which the second processing circuit operates. Based on the actually measured current value and the second comparison result between the second reference current value obtained in advance for the genuine product and the non-genuine product for the second period, the device to be determined is a genuine product. It is determined whether the product is a non-genuine product. Therefore, even if a non-genuine product in which all functions of the genuine product are completely copied 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. Because of 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 of the device to be determined can be easily determined by the determining means. 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, it is possible to perform the authentication of the device to be determined with higher accuracy by the determining means. Becomes

  A program according to a 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 apparatus having an authenticity determining function of a device to be determined having a current measuring unit that measures a current flowing from the power supply unit to the first processing circuit and the second processing circuit. A program for causing a device to be determined to function as a determination unit for determining whether the device is a genuine product or a non-genuine product, wherein the determination unit includes a first period during which the first processing circuit operates. And a first comparison result of a first actually measured current value measured by the current measurement unit and a first reference current value previously obtained for a genuine product or an irregular product for the first period. , The second A second actually measured current value measured by the current measuring unit in a second period in which the processing circuit operates, and a second reference current previously determined for a genuine or non-genuine product in the second period Determining whether the device to be determined is a genuine product or a non-genuine product based on the second comparison result with the value.

  According to the program of the thirteenth aspect, the determination unit is configured to determine the first measured current value measured by the current measurement unit during the first period in which the first processing circuit operates and the normal value with respect to the first period. A first comparison result with a first reference current value obtained in advance for a non-genuine product or a non-genuine product, and a second comparison result measured by the current measurement unit during a second period in which the second processing circuit operates. Based on the actually measured current value and the second comparison result between the second reference current value obtained in advance for the genuine product and the non-genuine product for the second period, the device to be determined is a genuine product. It is determined whether the product is a non-genuine product. Therefore, even if a non-genuine product in which all functions of the genuine product are completely copied 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. Because of 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 of the device to be determined can be easily determined by the determining means. 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, it is possible to perform the authentication of the device to be determined with higher accuracy by the determining means. Becomes

  A program according to a fourteenth aspect of the present invention includes an authenticity determination function using itself as a device to be determined, and includes a first processing circuit and a second processing circuit having different functions, the first processing circuit and the second processing circuit. A power supply unit for supplying power to the second processing circuit, and a current measurement unit for measuring a current flowing from the power supply unit to the first processing circuit and the second processing circuit. A computer to be operated as a determination unit for determining whether the device to be determined is a genuine product or an unauthorized product, wherein the determination unit operates the first processing circuit. A first measured current value measured by the current measuring unit in a first period and a first reference current value previously determined for a genuine product or a non-genuine product in the first period; The comparison result of 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 current value obtained in advance for the genuine product or the non-genuine product in the second period. And determining whether the device to be determined is a genuine product or a non-genuine product based on a second comparison result with a reference current value of 2.

  According to the program of the fourteenth aspect, the determination unit is configured to determine the first measured current value measured by the current measurement unit during the first period in which the first processing circuit operates, and the normal value with respect to the first period. A first comparison result with a first reference current value obtained in advance for a non-genuine product or a non-genuine product, and a second comparison result measured by the current measurement unit during a second period in which the second processing circuit operates. Based on the actually measured current value and the second comparison result between the second reference current value obtained in advance for the genuine product and the non-genuine product for the second period, the device to be determined is a genuine product. It is determined whether the product is a non-genuine product. Therefore, even if a non-genuine product in which all functions of the genuine product are completely copied 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. Because of 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 of the device to be determined can be easily determined by the determining means. 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, it is possible to perform the authentication of the device to be determined with higher accuracy by the determining means. Becomes

  According to a fifteenth aspect of the present invention, there is provided a method for determining the authenticity of a device to be determined, comprising: a power supply unit for supplying power to a first processing circuit and a second processing circuit having different functions of the device to be determined; And a current measuring unit for measuring a current flowing from the unit to the first processing circuit and the second processing circuit, wherein whether the device to be determined is a genuine product or a non-genuine product A method for determining the authenticity of a device to be determined, wherein a first measured current value measured by the current measuring unit during a first period in which the first processing circuit operates, and A first comparison result with a first reference current value obtained in advance for a genuine product or a non-genuine product, and measured by the current measurement unit in a second period in which the second processing circuit operates. The second measured current value and the The device to be determined is a genuine or non-genuine product based on a second comparison result with a second reference current value obtained in advance for a genuine product or a non-genuine product with respect to the period of 2. A step of determining whether or not there is any data.

  According to the authenticity determination method for the device to be determined according to the fifteenth aspect, the first measured current value measured by the current measurement unit during the first period in which the first processing circuit operates, and the first period And a first comparison result with a first reference current value obtained in advance for a genuine product or a non-genuine product, and a second comparison result measured by a current measurement unit in a second period in which the second processing circuit operates. 2 based on the actually measured current value of the second device and a second comparison result of the second reference current value obtained in advance for the genuine product or the non-genuine product for the second period. It is determined whether the product is a genuine product or a non-genuine product. Therefore, even if a non-genuine product in which all functions of the genuine product are completely copied 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. Because of 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. In addition, 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, it is possible to perform the authentication determination of the device to be determined with higher accuracy.

  The authenticity determination method for a device to be determined according to a sixteenth aspect of the present invention includes a first processing circuit and a second processing circuit having different functions, and a power supply to the first processing circuit and the second processing circuit. An information processing apparatus having an authenticity determination function of a device to be determined having a power supply unit for supplying the current, and a current measurement unit for measuring a current flowing from the power supply unit to the first processing circuit and the second processing circuit A method of determining whether an authenticated device is a genuine product or a non-genuine product, wherein the current measurement is performed during a first period in which the first processing circuit operates. A first comparison result between a first actually measured current value measured by the first unit and a first reference current value previously obtained for a genuine product or a non-genuine product for the first period; During the second period during which the processing circuit operates, A second comparison current value between the second measured current value measured by the current measuring unit and a second reference current value obtained in advance for a genuine or non-genuine product for the second period. , And a step of determining whether the device to be determined is a genuine product or a non-genuine product.

  According to the authenticity determination method for the device to be determined according to the sixteenth aspect, the first measured current value measured by the current measuring unit during the first period in which the first processing circuit operates, and the first period And a first comparison result with a first reference current value obtained in advance for a genuine product or a non-genuine product, and a second comparison result measured by a current measurement unit in a second period in which the second processing circuit operates. 2 based on the actually measured current value of the second device and a second comparison result of the second reference current value obtained in advance for the genuine product or the non-genuine product for the second period. It is determined whether the product is a genuine product or a non-genuine product. Therefore, even if a non-genuine product in which all functions of the genuine product are completely copied 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. Because of 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. In addition, 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, it is possible to perform the authentication determination of the device to be determined with higher accuracy.

  An authenticity determination method for a device to be determined according to a seventeenth aspect of the present invention includes an authenticity determination function using the device itself as a device to be determined, a first processing circuit and a second processing circuit having different functions, and A power supply unit that supplies power to the processing circuit and the second processing circuit, and a current measurement unit that measures a current flowing from the power supply unit to the first processing circuit and the second processing circuit. An information processing apparatus comprising: an authenticity determination method for a device to be determined, which determines whether the device to be determined is a genuine product or a non-genuine product, wherein the first period during which the first processing circuit operates is provided. And a first comparison result of a first actually measured current value measured by the current measurement unit and a first reference current value previously obtained for a genuine product or an irregular product for the first period. , A second operation of the second processing circuit. A second comparison result between the second actually measured current value measured by the current measuring unit during the second period and a second reference current value obtained in advance for the genuine product or the non-genuine product for the second period And a step of determining whether the device to be determined is a genuine product or a non-genuine product based on the above.

  According to the authenticity determination method for the device to be determined according to the seventeenth aspect, the first measured current value measured by the current measurement unit during the first period in which the first processing circuit operates, and the first period And a first comparison result with a first reference current value obtained in advance for a genuine product or a non-genuine product, and a second comparison result measured by a current measurement unit in a second period in which the second processing circuit operates. 2 based on the actually measured current value of the second device and a second comparison result of the second reference current value obtained in advance for the genuine product or the non-genuine product for the second period. It is determined whether the product is a genuine product or a non-genuine product. Therefore, even if a non-genuine product in which all functions of the genuine product are completely copied 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. Because of 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. In addition, 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, it is possible to perform the authentication determination of the device to be determined with higher accuracy.

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

FIG. 1 is a diagram illustrating a configuration of a memory system according to an embodiment of the present invention. FIG. 2 is a diagram illustrating a simplified configuration of a host device. FIG. 3 is a diagram schematically illustrating a configuration of a memory device. FIG. 4 is a diagram showing functions realized by executing a program by a CPU. FIG. 4 is a diagram illustrating an example of current consumption characteristics of a memory device. 4 is a flowchart illustrating a flow of a memory device authenticity determination process performed by the host device. It is a figure showing an example of an actual measurement current value pattern and a reference current value pattern. FIG. 9 is a diagram illustrating another example of the measured current value pattern. FIG. 14 is a diagram illustrating another configuration example of the host device. 4 is a flowchart illustrating a flow of a memory device authenticity determination process performed by the host device. FIG. 4 is a diagram showing functions realized by executing a program by a CPU. FIG. 4 is a diagram illustrating an example of current consumption characteristics of a memory device. 4 is a flowchart illustrating a flow of a memory device authenticity determination process performed by the host device. FIG. 2 is a diagram illustrating a simplified configuration of a host device. FIG. 3 is a diagram schematically illustrating a configuration of a memory device. FIG. 3 is a diagram illustrating a configuration of an authentication control circuit. FIG. 2 is a diagram illustrating a simplified configuration of a host device. FIG. 3 is a diagram schematically illustrating a configuration of a memory device. FIG. 3 is a diagram illustrating a configuration of an authentication control circuit.

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

<First Embodiment>
FIG. 1 is a diagram showing a configuration of a memory system 1 according to the 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, for example, 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 a main body of a printer or a multifunction peripheral, and the second information processing device is a toner cartridge. Alternatively, the first information processing device is a main body of a game machine, and the second information processing device is a memory card storing a game program.

  In the present embodiment, the host device 2 performs 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 device such as the memory device 3 is An aspect in which the device is a device to be determined 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 measurement 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 SoC 11 includes 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, a data A buffer 28 and a storage unit 29 such as a ROM or a RAM are provided. The storage unit 29 stores a program 101. The host device 2 supplies power for operating the memory device 3 connected thereto to the memory device 3 (the memory controller 31 and the memory controller 32) from the power supply VCC1 (power supply unit) via the power supply control unit 12 and the resistance element R. ). 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 the configuration of the memory device 3 in a simplified manner. As shown in FIG. 3, the memory device 3 includes a memory controller 31 and a memory core 32 having different functions. Each of the memory controller 31 and the memory core 32 is a signal processing circuit on the memory device 3 side. The memory controller 31 includes a host interface 41, a decoder 42, and a memory core interface 43. In a specific address area of the memory core 32, expected value data 201 described later is stored.

  FIG. 4 is a diagram showing functions 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 the authenticity judging unit 50 for judging. In other words, the program 101 is a program for causing a computer mounted on the host device 2 as the information processing device to function as the authentication 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. Note that the function of the authenticity determination unit 50 is not limited to being realized by software processing by the CPU 22, but may be realized by hardware processing using a dedicated circuit or the like.

  A genuine memory device 3 (genuine product) and a non-genuine memory device (counterfeit product) have significantly different current consumption characteristics due to different semiconductor device structures and manufacturing processes. The host device 2 according to the present embodiment creates an actually-measured current value pattern by actually measuring the current consumption value (absolute value) of the memory device 3, and obtains the actually-measured current value pattern and a known genuine or non-genuine product. By comparing the reference current value pattern with the reference current value pattern, it is determined whether the memory device 3 connected thereto is genuine or non-genuine. Hereinafter, this will be described in detail with reference to the drawings.

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

  The periods P11 and P15 are standby periods in which the memory device 3 waits for receiving a command from the host device 2. In the periods P11 and P15, neither the memory controller 31 nor the memory core 32 operates.

  The period P12 is a period during which the memory device 3 is receiving the read command transmitted by the host device 2. In the period P12, the memory controller 31 operates and the memory core 32 does not operate.

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

  The period P14 is a period during 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 includes the first actually measured current value pattern measured by the current value measurement circuit 13 during the period P12 in which the memory controller 31 operates alone, and the first measured current value pattern obtained in advance for the period P12. Is compared with the reference current value pattern. In addition, the authenticity determination unit 50 determines the second actually measured current value pattern measured by the current value measurement circuit 13 during the period P13 in which the memory core 32 operates alone, and the second reference current determined in advance for the period P13. Compare with 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 a genuine memory device 3, since the type of the semiconductor device to be mounted and the manufacturing process of each device are strictly controlled, the current consumption characteristics of the memory device 3 in each of the periods P11 to P15 are almost constant. . Therefore, information indicating current consumption characteristics in each of the periods P11 to P15 is created before shipment from the factory, and is stored as encrypted expected value data 201 (see FIG. 3) in a specific address area of the memory core 32. I have. In the example of the present embodiment, each of the period P12 in which the memory controller 31 operates alone and the period P13 in which the memory core 32 operates alone are described.
・ Transition pattern of current consumption value obtained by sampling current consumption value at predetermined sampling frequency (reference current value pattern)
・ Maximum value, minimum value and average value of current consumption value (reference representative value)
Are stored in the memory core 32 as expected value data 201.

  When the non-genuine product to be excluded is already specified, the reference current value pattern and the reference representative value for the non-genuine product are replaced with the memory core 32 in place of the reference current value pattern and the reference representative value for the genuine product. May be stored. 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 an actually measured current value pattern (to be described in detail later) matches the reference current value pattern. Can be determined. When the reference current value pattern relating to the non-genuine product is used, it can be determined whether or not the memory device 3 is a non-genuine product based on whether or not the actually measured current value pattern matches the reference current value pattern. The same applies to the reference representative value. In the present embodiment and each of the following modified examples, an example will be described in which a reference current value pattern and a reference representative value for a genuine product are used.

  FIG. 6 is a flowchart showing a flow of the authenticity determination processing of the memory device 3 by the host device 2. When the memory device 3 is connected to the host device 2, first, in step SP <b> 101, the CPU 22 (period setting unit 51) sets a plurality of determination target periods to be subjected to authentication determination from the periods P <b> 11 to P <b> 15. The period setting unit 51 can statically change the determination target period according to a predetermined rule, or dynamically change the determination target period according to the cumulative number of times of execution of the authenticity determination, the operation status of the memory system 1, and the like. Can be changed to In the example of the present embodiment, the period P12 during which the memory controller 31 operates alone is set as the first determination target period, and the period P13 during which the memory core 32 operates alone is the second determination target period. Is set as

  In addition, the period setting unit 51 sets the content of the authenticity determination process to be performed for each of the first and second determination target periods. 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, when the comparison process between the current value patterns is executed as the default process, this setting may be omitted.

  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 from the memory core interface 43 to the memory core 32, 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 periods P12 and P13”, a reference current value pattern for each period P12 and P13, Data indicating a predetermined allowable error value corresponding to each of them is read from the memory core 32 as desired expected value data 201. As the allowable error value, an optimum value is set in advance within a range of plus or minus several percent to plus or minus ten and several percent according to the distribution of the current value in the reference current value pattern for each of the periods 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 decryptor 23 decrypts the encrypted expected value data 201. The decrypted 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 of the periods P12 and P13 and data indicating a predetermined allowable error value corresponding to each of them 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 VCC1 to the memory controller 31 via the power supply control unit 12 and the resistance element R. When power is supplied from the power supply VCC1 to the memory controller 31, a current flows through the resistance element R. The current value measurement circuit 13 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), A / D converted by the ADC 26, and then sequentially input to the CPU 22 by the current value acquisition unit 52. Instead of the above-described configuration in which the pre-amplifier amplifies the actually measured current value before the A / D conversion by the ADC 26, a configuration in which the actually-measured current value is amplified by the multiplier after the A / D conversion by the ADC 26 may be adopted (hereinafter, referred to) Similar).

  Further, subsequent to the period P12, in a period P13, a read address is input from the memory core interface 43 to the memory core 32, so that a memory access to the memory core 32 is performed. In the period P13, power is supplied from the power supply VCC1 to the memory core 32 via the power supply control unit 12 and the resistance element R. When power is supplied from the power supply VCC1 to the memory core 32, a current flows through the resistance element R. The current value measurement circuit 13 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), A / D 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 creating unit 53) arranges the plurality of measured current values sequentially acquired by the current value acquiring unit 52 in chronological order, thereby obtaining the measured current value pattern of the memory controller 31 for the period P12. And the measured current value pattern of the memory core 32 for the period P13.

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

  Next, in step SP106, the CPU 22 (pattern comparison unit 54) compares 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 illustrating an example of the measured current value pattern and the reference current value pattern with respect to 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 milliseconds to several tens of milliseconds, the actually measured current value pattern and the reference current value pattern are actually 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 respectively constituted by seven measured current values X01 to X07 and the reference current values Y01 to Y07 for simplification of the description. The pattern comparing section 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 smaller than the allowable error value read from the expected value storage memory 24.

  Next, in step SP107, the CPU 22 (authentication determining unit 50) determines whether or not all of 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, if the difference between the actually measured current value X and the reference current value Y is less than or equal to the allowable error value (that is, if they completely match) in both of the periods P12 and P13, the host device 2 Is determined to be a genuine product, and the authenticity determination processing ends. In the example shown in FIG. 7, the measured current value X and the reference current value Y completely match.

  On the other hand, in the case where at least one difference exceeds the allowable error value for each of the periods P12 and P13 (that is, when they do not completely match), the authenticity determination unit 50 determines that the memory device 3 connected to the host device 2 is not connected. It is determined that the memory device 3 is a genuine product, and a process for excluding the memory device 3 that 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 VCC1 to the memory device 3 is stopped.

  FIG. 8 is a diagram illustrating another example of the actually measured current value pattern. The maximum value, the minimum value, and the average value of the seven measured current values forming 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. 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 as to whether or not the difference between the respective current values is equal to or smaller than the allowable error value are executed by software processing of the CPU 22. An example is given. However, in order to avoid an increase in the processing load of the CPU 22 due to the huge number of samplings of the current value measurement circuit 13, these calculations may be executed by hardware processing using a dedicated calculator. .

  FIG. 9 is a diagram illustrating another configuration example of the host device 2. The arithmetic unit 60 is mounted on the SoC 11. The calculation for obtaining the difference between the measured current value X and the reference current value Y and the calculation as to whether or not the difference between the respective current values is equal to or smaller than the allowable error value are executed by the calculator 60. The data 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 controls the current value measurement circuit in the first period P12 during which the memory controller 31 (first processing circuit) operates. 13 (a current measuring unit) and a first comparison of a first reference current value previously obtained for a genuine product or a non-genuine product in the first period P12. The result, the second actually measured current value measured by the current value measurement circuit 13 in the second period P13 in which the memory core 32 (the second processing circuit) operates, and a genuine product or a non-genuine product in 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 a second comparison result with a second reference current value obtained in advance for a genuine product. I do. Therefore, even if a non-genuine product in which all functions of the genuine product are completely copied 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. Because of 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 judgment unit 50 can easily execute the authenticity judgment 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 perform the authentication 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 or non-genuine product based on the comparison result between the actually 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 the non-genuine product is often larger than that of the genuine product. 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 current consumption change rate pattern. Thus, even if the current consumption change rate patterns are similar, the authenticity determination of the memory device 3 can be performed with high accuracy.

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

  Further, according to host device 2 according to the present embodiment, period setting unit 51 variably sets the first and second determination target periods. Therefore, the first and second determination target periods for which the memory device 3 is to be authenticated can be statically or dynamically changed by the period setting unit 51, which makes it more difficult for a third party to analyze the determination algorithm. Can be realized.

  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. The expected value data 201 of the memory device 3 differs for each device because it depends on the structure of the device, the manufacturing process, and the like. 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 that differs for each device.

  Hereinafter, various modifications of the first embodiment will be described. The modifications described below can be applied by arbitrarily combining the modifications, and can be applied by being arbitrarily combined with Embodiments 2 to 4 described later.

<Modification 1>
In the first embodiment, the authenticity determination unit 50 determines that the memory device 3 is genuine if all the measured current values X for each of the periods P12 and P13 completely match the corresponding reference current value Y. It was determined.

  On the other hand, the authenticity determination unit 50 according to the present modification determines that 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. If the ratio is less than the first threshold in at least one of the periods P12 and P13, the memory device 3 is determined to be genuine. 3 is determined to be a non-genuine product. An optimal 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 determines that the ratio of the measured current value X that matches the corresponding reference current value Y among all the measured current values X for each of the periods P12 and P13. Whether the memory device 3 is a genuine product or a non-genuine product is determined based on whether or not the memory device 3 is equal to or more than the threshold value of 1. Therefore, for example, even when the measured current value X of the genuine product instantaneously increases or decreases due to sudden noise or the like, it is possible to avoid a situation where the genuine product is erroneously determined to be a non-genuine product. Becomes

<Modification 2>
In the first embodiment, in each of the periods P12 and P13, the pattern creating unit 53 creates the measured current value pattern only once, and the pattern comparing unit 54 compares the measured current value pattern with the reference current value pattern only once. Then, the authenticity judging section 50 judges the authenticity of the memory device 3 based on the result of the single comparison by the pattern comparing section 54.

  On the other hand, the authenticity determining unit 50 according to the present modification performs the authenticity determination of the memory device 3 based on a plurality of comparison results by the pattern comparing unit 54.

  FIG. 10 is a flowchart illustrating a flow of the authenticity determination processing of the memory device 3 by the host device 2. Subsequent to step SP106, in step SP201, the authenticity determination unit 50 executes the comparison process between the actually measured current value pattern and the reference current value pattern by the pattern comparing unit 54 a predetermined number of N times (where N is a plurality) for each of the periods P12 and P13. It is determined whether or not it has been performed.

  If the comparison process has not been performed N times for each of the periods P12 and P13, the CPU 22 executes the processes of steps SP103 to SP106 again. On the other hand, when the comparison process has been performed N times for each of the periods P12 and P13, the CPU 22 proceeds to the process of step SP107.

  In step SP107, the authenticity determination unit 50 determines, in both of the periods P12 and P13, the percentage of the N times of comparison processing performed by the pattern comparison unit 54 that the measured current value pattern is determined to match the reference current value pattern. When the ratio is equal to or more than the second threshold, the memory device 3 is determined to be a genuine product. On the other hand, when the ratio is less than the second threshold in at least one of the periods P12 and P13, It is determined that the memory device 3 is an unauthorized product. As the value of the predetermined number N, an optimum value is also set in step SP101 according to the required determination accuracy or the like. The second threshold value is also set to an optimum value 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 performs the process of creating the actually measured current value pattern by the pattern creating unit 53, and compares the actually measured current value pattern with the reference current value pattern by the pattern comparing unit 54. The process is executed a plurality of N times for each of the periods P12 and P13. Then, of the N comparison processes performed by the pattern comparison unit 54, the memory determines whether the rate at which the actually measured current value pattern matches the reference current value pattern is equal to or greater than the second threshold value. It is determined whether the device 3 is genuine or non-genuine. In this manner, a series of processes by the pattern creation unit 53 and the pattern comparison unit 54 are repeatedly executed a plurality of N times for each of the periods P12 and P13, and the authenticity of the memory device 3 is determined based on the comparison results of the N times by the pattern comparison unit 54. By performing the determination, the determination accuracy can be improved.

<Modification 3>
In the first embodiment, the authenticity determination unit 50 determines the authenticity of the memory device 3 for each of the periods P12 and P13 based on the comparison result between the actually measured current value pattern and the reference current value pattern.

  On the other hand, the authenticity determination unit 50 according to the present modification uses the comparison result of the measured representative value and the reference representative value instead of the comparison result of the measured current value pattern and the reference current value pattern for each of the periods P12 and P13. , 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. Have been.

  FIG. 11 is a diagram showing functions 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 the present modification includes a first actually measured representative value measured by the current value measurement circuit 13 during a period P12 in which the memory controller 31 operates alone, and a first reference determined in advance for the period P12. Compare with the representative value. In addition, the authenticity judgment unit 50 calculates the second measured representative value measured by the current value measurement circuit 13 during the period P13 in which the memory core 32 operates alone, and the second reference representative value obtained in advance 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 illustrating an example of current consumption characteristics of the memory device 3. As in the first embodiment, in step SP101, the period setting unit 51 sets the periods P12 and P13 as the determination target periods. In step SP101, the period setting unit 51 sets “comparison processing between the maximum value, the minimum value, and the average value” as the content of the authenticity determination process performed in each of the periods P12 and P13.

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

  In step SP301, the representative value calculation unit 55 obtains an actually measured maximum value, an actually measured minimum value, and an actually measured average value for each of the periods P12 and P13 based on the actually measured current value X acquired by the current value acquiring unit 52.

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

  In step SP303, the representative value comparison unit 56 determines whether the difference between the actually measured maximum value and the reference maximum value is equal to or less than an allowable error value for each of the periods P12 and P13, and determines whether the difference between the actually measured minimum value and the reference minimum value is acceptable. It is determined whether or not the difference is equal to or less than the error value, and whether or not the difference between the actually 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 genuine if the difference between the three representative values is equal to or less than the allowable error value for both the periods P12 and P13. On the other hand, if at least one of the periods P12 and P13 has a difference between any of the representative values exceeding the allowable error value, the memory device 3 is determined to be a non-genuine product.

  The calculation for obtaining the measured representative value, the calculation for determining the difference between the measured representative value and the reference representative value, and the calculation for determining whether the difference between the measured representative value and the reference representative value are equal to or smaller than the allowable error value are shown in FIG. 9 may be executed by the arithmetic unit 60 shown in FIG. Instead of using all three measured representative values (the maximum value, the minimum value, and the average value), a part of the 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 determines 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 of the periods P12 and P13. It is determined whether the device 3 is genuine or non-genuine. Thus, by comparing the measured representative value with the reference representative value instead of comparing the measured current value pattern with the reference current value pattern, there is no need to create the measured current value pattern. Since it is not necessary to hold the value pattern, the authenticity of the memory device 3 can be easily determined.

  Further, according to the host device 2 according to the present modification, the representative value calculating unit 55 calculates at least one of the average value, the maximum value, and the minimum value as the measured representative value. 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, an aspect in which the memory device 3 performs 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 device such as the host device 2 is used. An aspect in which the device is a device to be determined 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 includes an SoC 11 and a memory interface 12 having different functions. The SoC 11 is connected to a nonvolatile storage unit 15. The storage unit 15 stores expected value data 202.

  The SoC 11 includes a CPU 22, a command buffer 27, and a data buffer 28, which are mutually connected via a bus 21. The SoC 11 and the memory interface 14 are supplied with drive power from a power supply VCC2 (power supply unit) via a 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 measurement 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 measurement circuit 33 measures the current value of the current flowing from the power supply VCC2 to the SoC 211 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 a configuration of the authentication control circuit 34. 16, the authentication control circuit 34 includes a CPU 72, a decoder 73, an expected value storage memory 74, a GPIO 75, a power supply control unit 76, an ADC 77, and a CPU 72, which are mutually connected via a bus 71. It comprises a storage unit 78 such as a ROM or a RAM. The storage unit 78 stores a program 102.

  By executing the program 102 read from the storage unit 78 by the CPU 72, the CPU 72 functions as an authenticity determination unit 50 that determines 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 a 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 actually measured current value pattern measured by the current value measurement circuit 33 in a first determination target period in which the SoC 11 operates alone; Is compared with a first reference current value pattern obtained in advance. In addition, the authenticity determination unit 50 determines in advance the second actually 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 alone and the second determination target period. The obtained second reference current value pattern is compared 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 the comparison results.

  Referring to FIG. 6, when memory device 3 is connected to host device 2, first, in step SP101, CPU 72 (period setting unit 51) sets a plurality of determination target periods for which authentication is to be performed. In the example of the present embodiment, a period in which the SoC 11 operates alone is set as the first determination target period, and a period in which the memory interface 14 operates alone is set as the second determination target period. . In addition, the period setting unit 51 sets the content of the authenticity determination process to be performed for each of the first and second determination target periods. 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 performed. The reference current value pattern relating to the target period and data indicating a predetermined permissible error value corresponding to each are read from the storage unit 15 as 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 alone in the first determination target period. In the first determination target period, power is supplied from the power supply VCC2 to the SoC 11 via the resistance element R. When power is supplied from the power supply VCC2 to the SoC 11, a current flows through the resistance element R. The current value measurement circuit 33 measures the current value of the current flowing from the power supply VCC2 to the SoC 11 by sampling the voltage across the resistance element R at a predetermined sampling frequency.

  Further, the CPU 72 operates the memory interface 14 alone during the second determination target period. In the second determination target period, power is supplied from the power supply VCC2 to the memory interface 14 via the resistance element R. When power is supplied from the power supply VCC2 to the memory interface 14, a current flows through the resistance element R. The current value measurement circuit 33 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 creating unit 53) arranges the plurality of actually measured current values sequentially acquired by the current value acquiring unit 52 in chronological order, so that the actually measured current value of the SoC 11 for the first determination target period. A pattern and an actually measured current value pattern of the memory interface 14 for 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 allowable error 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 (authentication unit 50) determines whether or not all of the differences between the actually measured current value X and the reference current value Y are equal to or less than the allowable error value for each of the first and second determination target periods. Is determined. Then, the authenticity determination unit 50 determines whether the difference between the actually measured current value X and the reference current value Y is equal to or less than the allowable error value (that is, when they completely match) in both the first and second determination target periods. The host device 2 determines that the device is genuine and ends the authenticity determination process.

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

  As described above, according to the memory device 3 (information processing device) according to the present embodiment, the authenticity determination unit 50 performs the current value measurement circuit 33 in the first determination target period in which the SoC 11 (first processing circuit) operates. (1st comparison of the first measured current value measured by the (current measuring unit) with the first reference current value previously obtained for the genuine product or the non-genuine product in the first determination target period. The result, the second actually measured current value measured by the current value measurement circuit 33 in the second determination target period in which the memory interface 14 (second processing circuit) operates, and a genuine product for the second determination target period Alternatively, based on a second comparison result with a second reference current value obtained in advance for the non-genuine product, whether the host device 2 (determined device) is a genuine product or a non-genuine product Is determined. Therefore, even if a non-genuine product in which all functions of the genuine product are completely copied 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. Because of 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 perform the authenticity determination of the host device 2. Moreover, since the authenticity judgment is performed based on the current consumption characteristics of both the SoC 11 and the memory interface 14 having different functions, the authenticity judgment unit 50 can execute the authenticity judgment of the host device 2 with higher accuracy.

<Embodiment 3>
In the present embodiment, a mode in which the host device 2 itself performs 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 the determination device and the device to be determined 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 an SoC 11, a power supply control unit 12, a current value measurement circuit 16, a memory interface 14, and a nonvolatile storage unit 15. The storage unit 15 stores expected value data 203.

  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 a RAM, which are interconnected via a bus 21. It is configured. The storage unit 29 stores a program 103. Driving power is supplied to the SoC 11 and the memory interface 14 from the power supply VCC3 (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 VCC3 to the SoC 211 and the memory interface 14 by measuring the voltage across the resistance element R.

  By executing the program 103 read from the storage unit 29 by the CPU 22, the CPU 22 functions as an authenticity determination unit 50 that determines whether the host device 2 is a genuine product or an unauthorized product, as shown in FIG. . In other words, the program 103 is a program for causing a computer mounted on the host device 2 as the first information processing device to function as the authentication unit 50.

  The authenticity determination unit 50 according to the present embodiment includes: a first actually measured current value pattern measured by the current value measurement circuit 16 in a first determination target period in which the SoC 11 operates alone; Is compared with a first reference current value pattern obtained in advance. In addition, the authenticity determination unit 50 determines in advance the second actually 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 alone, and the second determination target period. The obtained second reference current value pattern is compared 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 the comparison results.

  Referring to FIG. 6, when memory device 3 is connected to host device 2, first, in step SP101, CPU 22 (period setting unit 51) sets a plurality of determination target periods in which authentication is to be performed. In the example of the present embodiment, a period in which the SoC 11 operates alone is set as the first determination target period, and a period in which the memory interface 14 operates alone is set as the second determination target period. . In addition, the period setting unit 51 sets the content of the authenticity determination process to be performed for each of the first and second determination target periods. 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 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 performed. The reference current value pattern for the target period and data indicating a predetermined allowable error value corresponding to each are read from the storage unit 15 as 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 SoC 11 alone in the first determination target period. In the first determination target period, power is supplied from the power supply VCC3 to the SoC 11 via the resistance element R. When power is supplied from the power supply VCC3 to the SoC 11, a current flows through the resistance element R. The current value measurement circuit 16 actually measures the current value of the current flowing from the power supply VCC3 to the SoC 11 by sampling the voltage across the resistance element R at a predetermined sampling frequency.

  Further, the CPU 22 operates the memory interface 14 alone in the second determination target period. In the second determination target period, power is supplied from the power supply VCC3 to the memory interface 14 via the resistance element R. When power is supplied from the power supply VCC3 to the memory interface 14, a current flows through the resistance element R. The current value measurement 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 between both ends of the resistance element R at a predetermined sampling frequency.

  Next, in step SP104, the CPU 22 (pattern creating unit 53) arranges the plurality of actually measured current values sequentially acquired by the current value acquiring unit 52 in chronological order, so that the actually measured current value of the SoC 11 for the first determination target period. A pattern and an actually measured current value pattern of the memory interface 14 for 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 allowable error 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) compares the actually measured current value pattern created by the pattern creation unit 53 with the reference value 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 (authentication 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 smaller than the allowable error value for each of the first and second determination target periods. Is determined. Then, the authenticity determination unit 50 determines whether the difference between the actually measured current value X and the reference current value Y is equal to or less than the allowable error value (that is, when they completely match) in both the first and second determination target periods. The host device 2 determines that the device is genuine and ends the authenticity determination process.

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

  As described above, according to the host device 2 (information processing device) according to the present embodiment, the authenticity determination unit 50 controls the current value measurement circuit 16 in the first determination target period in which the SoC 11 (first processing circuit) operates. (1st comparison of the first measured current value measured by the (current measuring unit) with the first reference current value previously obtained for the genuine product or the non-genuine product in the first determination target period. The result, the second actually measured current value measured by the current value measurement circuit 16 in the second determination target period in which the memory interface 14 (the second processing circuit) operates, and the genuine product for the second determination target period Alternatively, based on a second comparison result with a second reference current value obtained in advance for a non-genuine product, whether the host device 2 (determined device) is a genuine product or a non-genuine product Is determined. Therefore, even if a non-genuine product in which all functions of the genuine product are completely copied 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. Because of 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 perform the authenticity determination of the host device 2. Moreover, since the authenticity judgment is performed based on the current consumption characteristics of both the SoC 11 and the memory interface 14 having different functions, the authenticity judgment unit 50 can execute the authenticity judgment of the host device 2 with higher accuracy.

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

  FIG. 18 is a diagram showing the configuration of the memory device 3 in a simplified manner. As shown in FIG. 18, the memory device 3 includes a memory controller 31, a memory core 32, a current value measurement 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 VCC4 (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. The memory core 32 stores expected value data 204.

  FIG. 19 is a diagram showing a configuration of the authentication control circuit 34. 19, the authentication control circuit 34 includes a CPU 72, a decoder 73, an expected value storage memory 74, a GPIO 75, a power control unit 76, an ADC 77, and a CPU 72, which are mutually connected via a bus 71. It comprises a storage unit 78 such as a ROM or a RAM. The storage unit 78 stores a program 104.

  By executing the program 104 read from the storage unit 78 by the CPU 72, the CPU 72 functions as an authenticity determination unit 50 that determines 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 a 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 the 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 alone, and the first determination A first reference current value pattern obtained in advance for the target period is compared. In addition, the authenticity determination unit 50 determines in advance the second actually 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 alone and the second determination target period. The obtained second reference current value pattern is compared 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.

  Referring to FIG. 6, when memory device 3 is connected to host device 2, first, in step SP101, CPU 72 (period setting unit 51) sets a plurality of determination target periods for which authentication is to be performed. In the example of the present embodiment, a period in which the memory controller 31 operates alone is set as the first determination target period, and a period in which the memory core 32 operates alone is set as the second determination target period. Is done. In addition, the period setting unit 51 sets the content of the authenticity determination process to be performed for each of the first and second determination target periods. 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 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 performed. The reference current value pattern relating to the target period and data indicating a predetermined permissible error value corresponding to each are read out from the memory core 32 as 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 alone during the first determination target period. In the first determination target period, power is supplied from the power supply VCC4 to the memory controller 31 via the resistance element R. When power is supplied from the power supply VCC4 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 VCC4 to the memory controller 31 by sampling the voltage across the resistance element R at a predetermined sampling frequency.

  The CPU 72 operates the memory core 32 alone during the second determination target period. In the second determination target period, power is supplied from the power supply VCC4 to the memory core 32 via the resistance element R. When power is supplied from the power supply VCC4 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 VCC4 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 creating unit 53) arranges the plurality of actually measured current values sequentially acquired by the current value acquiring unit 52 in chronological order, thereby performing the actual measurement of the memory controller 31 for the first determination target period. A current value pattern and an actually measured current value pattern of the memory core 32 for 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 allowable error 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 (authentication unit 50) determines whether or not all of the differences between the actually measured current value X and the reference current value Y are equal to or less than the allowable error value for each of the first and second determination target periods. Is determined. Then, the authenticity determination unit 50 determines whether the difference between the actually measured current value X and the reference current value Y is equal to or less than the allowable error value (that is, when they completely match) in both the first and second determination target periods. Determines that the memory device 3 is genuine, and ends the authenticity determination process.

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

  As described above, according to the memory device 3 (information processing device) according to the present embodiment, the authenticity determination unit 50 performs the current value measurement in the first determination target period in which the memory controller 31 (first processing circuit) operates. The first value of the first actually measured current value measured by the circuit 33 (current measuring unit) and the first reference current value obtained in advance for the genuine product or the non-genuine product in the first determination target period. , The second measured current value measured by the current value measurement circuit 33 in the second determination target period in which the memory core 32 (the second processing circuit) operates, and the second determination target period. Whether the memory device 3 (determined device) is a genuine product or a non-genuine product based on a second comparison result with a second reference current value obtained in advance for a genuine product or a non-genuine product. It is determined whether there is. Therefore, even if a non-genuine product in which all functions of the genuine product are completely copied 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. Because of 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 judgment unit 50 can easily execute the authenticity judgment 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 perform the authentication of the memory device 3 with higher accuracy. .

2 Host device 3 Memory device 11 SoC
12 Power supply control unit 13, 33 Current value measurement circuit 14 Memory interface 22, 72 CPU
Reference Signs List 31 memory controller 32 memory core 34 authentication control circuit 50 authentication 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 to 104 program 201 to 204 expected data

Claims (17)

An information processing apparatus having an authenticity determination function of a device to be determined having a first processing circuit and a second processing circuit having different functions,
A power supply unit for supplying power to the first processing circuit and the second processing circuit;
A current measuring unit that measures a current flowing from the power supply unit to the first processing circuit and the second processing circuit;
A determination unit that determines whether the device to be determined is a genuine product or a non-genuine product,
With
The determination unit includes:
A first actually measured current value measured by the current measuring unit in a first period in which the first processing circuit operates, and a first current value obtained in advance for a genuine or non-genuine product in the first period. A first comparison result with a reference current value of 1;
A second actually measured current value measured by the current measuring unit during a second period in which the second processing circuit operates, and a second measured current value obtained in advance for a genuine or non-genuine product in the second period. A second comparison result with a reference current value of 2;
An information processing apparatus that determines whether the device to be determined is a genuine product or a non-genuine product based on the information. A first processing circuit and a second processing circuit having different functions, and an authenticity determining function of a device to be determined having a power supply unit that supplies power to the first processing circuit and the second processing circuit; An information processing device,
A current measuring unit that measures a current flowing from the power supply unit to the first processing circuit and the second processing circuit;
A determination unit that determines whether the device to be determined is a genuine product or a non-genuine product,
With
The determination unit includes:
A first actually measured current value measured by the current measuring unit in a first period in which the first processing circuit operates, and a first current value obtained in advance for a genuine or non-genuine product in the first period. A first comparison result with a reference current value of 1;
A second actually measured current value measured by the current measuring unit during a second period in which the second processing circuit operates, and a second measured current value obtained in advance for a genuine or non-genuine product in the second period. A second comparison result with a reference current value of 2;
An information processing apparatus that determines whether the device to be determined is a genuine product or a non-genuine product based on the information. An information processing device having an authenticity determination function that uses itself as a device to be determined,
A first processing circuit and a second processing circuit having different functions,
A power supply unit for supplying power to the first processing circuit and the second processing circuit;
A current measuring unit that measures a current flowing from the power supply unit to the first processing circuit and the second processing circuit;
A determination unit that determines whether the device to be determined is a genuine product or a non-genuine product,
With
The determination unit includes:
A first actually measured current value measured by the current measurement unit during a first period in which the first processing circuit operates, and a first current value obtained in advance for a genuine or non-genuine product in the first period. A first comparison result with a reference current value of 1;
A second actually measured current value measured by the current measuring unit during a second period in which the second processing circuit operates, and a second measured current value obtained in advance for the genuine or non-genuine product in the second period. A second comparison result with a reference current value of 2;
An information processing apparatus that determines whether the device to be determined is a genuine product or a non-genuine product based on the information. The determination unit includes:
A plurality of actually measured current values measured by the current measurement unit at a plurality of measurement timings, a current value acquisition unit that acquires from the current measurement unit,
By arranging a plurality of measured current values acquired by the current value acquisition unit in chronological order, a pattern creation unit that creates an actually measured current value pattern,
A measured current value pattern created by the pattern creating unit, and a pattern comparing unit that compares a reference current value pattern that is a pattern of a reference current value obtained in advance for a genuine or non-genuine product,
The information processing apparatus according to claim 1, further comprising: The pattern comparing unit compares a plurality of measured current values forming the measured current value pattern with a plurality of reference current values forming the reference current value pattern,
5. The determination unit according to claim 4, wherein the determination unit determines whether the device to be determined is a genuine product or a non-genuine product by determining whether all measured current values match a corresponding reference current value. An information processing apparatus according to claim 1. The pattern comparing unit compares a plurality of measured current values forming the measured current value pattern with a plurality of reference current values forming the reference current value pattern,
The determination unit determines that the device to be determined is a genuine product based 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 greater than a first threshold value. The information processing device according to claim 4, wherein the information processing device determines whether the product is an unauthorized product. The determination unit includes:
Executing a process of creating an actually measured current value pattern by the pattern creating unit and a process of comparing the actually measured current value pattern with the reference current value pattern by the pattern comparing unit N times (where N is a plurality);
In the N times of comparison processing by the pattern comparing unit, the determination is made based on whether or not the ratio of the measured current value pattern matching the reference current value pattern is equal to or greater than a second threshold value. The information processing apparatus according to claim 4, wherein the information processing apparatus determines whether the apparatus is a genuine product or a non-genuine product. The determination unit includes:
A plurality of actually measured current values measured by the current measurement unit at a plurality of measurement timings, a current value acquisition unit that acquires from the current measurement unit,
Based on a plurality of measured current values acquired by the current value acquisition unit, a representative value calculation unit that calculates a predetermined measured representative value,
A representative value comparison unit that compares a measured representative value calculated by the representative value calculation unit with a reference representative value that is a representative value obtained in advance for a genuine product or a non-genuine product.
The information processing apparatus according to claim 1, further comprising:   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 the measured representative value.   The information processing apparatus according to claim 1, wherein the determination unit further includes a period setting unit that variably sets the first period and the second period. The device to be determined further includes a storage unit that stores the first reference current value and the second reference current value,
The information processing apparatus according to claim 1, wherein the determination unit reads the first reference current value and the second reference current value from the storage unit. A power supply unit for supplying power to the first processing circuit and the 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 And a current measurement unit for measuring the information processing device, a program for causing a computer mounted on the information processing device to function as a determination unit for determining whether the device to be determined is a genuine product or an unauthorized product. ,
The determining means includes:
A first actually measured current value measured by the current measuring unit in a first period in which the first processing circuit operates, and a first current value obtained in advance for a genuine or non-genuine product in the first period. A first comparison result with a reference current value of 1;
A second actually measured current value measured by the current measuring unit during a second period in which the second processing circuit operates, and a second measured current value obtained in advance for a genuine or non-genuine product in the second period. A second comparison result with a reference current value of 2;
A program that determines whether the device to be determined is a genuine product or a non-genuine product based on the program. A first processing circuit and a second processing circuit having different functions, and an authenticity determining function of a device to be determined including a power supply unit that supplies power to the first processing circuit and the second processing circuit; A computer mounted on an information processing apparatus 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 determined by determining whether the device to be determined is a genuine product. A program for functioning as determination means for determining whether the product is genuine,
The determining means includes:
A first actually measured current value measured by the current measuring unit in a first period in which the first processing circuit operates, and a first current value obtained in advance for a genuine or non-genuine product in the first period. A first comparison result with a reference current value of 1;
A second actually measured current value measured by the current measuring unit during a second period in which the second processing circuit operates, and a second measured current value obtained in advance for the genuine or non-genuine product in the second period. A second comparison result with a reference current value of 2;
A program that determines whether the device to be determined is a genuine product or a non-genuine product based on the program. A first processing circuit and a second processing circuit having different functions, each of which has an authenticity determination function using itself as a device to be determined, and a power supply unit for supplying power to the first processing circuit and the second processing circuit A computer mounted on an information processing apparatus comprising: a current measuring unit configured to measure 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
The determining means includes:
A first actually measured current value measured by the current measuring unit in a first period in which the first processing circuit operates, and a first current value obtained in advance for a genuine or non-genuine product in the first period. A first comparison result with a reference current value of 1;
A second actually measured current value measured by the current measuring unit during a second period in which the second processing circuit operates, and a second measured current value obtained in advance for a genuine or non-genuine product in the second period. A second comparison result with a reference current value of 2;
A program that determines whether the device to be determined is a genuine product or a non-genuine product based on the program. A power supply unit for supplying power to the first processing circuit and the 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 And a current measuring unit for measuring the device, in the information processing device comprising: determining whether the device to be determined is a genuine product or an unauthorized product, a method for determining the authenticity of the device to be determined,
A first actually measured current value measured by the current measuring unit in a first period in which the first processing circuit operates, and a first current value obtained in advance for a genuine or non-genuine product in the first period. A first comparison result with a reference current value of 1;
A second actually measured current value measured by the current measuring unit during a second period in which the second processing circuit operates, and a second measured current value obtained in advance for the genuine or non-genuine product in the second period. A second comparison result with a reference current value of 2;
A method of determining whether the device to be determined is a genuine product or a non-genuine product based on the above. A first processing circuit and a second processing circuit having different functions, and an authenticity determining function of a device to be determined including a power supply unit that supplies power to the first processing circuit and the second processing circuit; In an information processing apparatus 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 device to be determined is a genuine product or a non-genuine product Is a method of determining the authenticity of the device to be determined,
A first actually measured current value measured by the current measuring unit in a first period in which the first processing circuit operates, and a first current value obtained in advance for a genuine or non-genuine product in the first period. A first comparison result with a reference current value of 1;
A second actually measured current value measured by the current measuring unit during a second period in which the second processing circuit operates, and a second measured current value obtained in advance for a genuine or non-genuine product in the second period. A second comparison result with a reference current value of 2;
A method of determining whether the device to be determined is a genuine product or a non-genuine product based on the above. A first processing circuit and a second processing circuit having different functions, each of which has an authenticity determination function using itself as a device to be determined, and a power supply unit for supplying power to the first processing circuit and the second processing circuit And a current measuring unit that measures a current flowing from the power supply unit to the first processing circuit and the second processing circuit, wherein the device to be determined is a genuine product or an unauthorized product. Determining whether the device is an article, an authenticity determination method for the device to be determined,
A first actually measured current value measured by the current measuring unit in a first period in which the first processing circuit operates, and a first current value obtained in advance for a genuine or non-genuine product in the first period. A first comparison result with a reference current value of 1;
A second actually measured current value measured by the current measuring unit during a second period in which the second processing circuit operates, and a second measured current value obtained in advance for a genuine or non-genuine product in the second period. A second comparison result with a reference current value of 2;
A method 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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