JP2017076439A - Information processing apparatus, initial response method, and IC card - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an information processing apparatus, an initial response method, and an IC card capable of providing information for guiding voltage that cannot guarantee operation to appropriate voltage even when the voltage has been supplied from an external device such as a reading device.SOLUTION: An information processing device discriminates voltage applied from an external device at timing with which a reset signal is received, returns initial response information that displays a voltage class of operation guarantee voltage when the discriminated voltage is not the operation guarantee voltage, and returns initial response information that does not display the voltage class of the operation guarantee voltage when the discriminated voltage is the operation guarantee voltage.SELECTED DRAWING: Figure 2

Description

  The present invention relates to the technical field of an IC card that can communicate with an external device.

According to the international standard ISO / IEC 7816-3 for IC cards and the like, voltages for driving internationally compatible IC cards are classified into three classes (class A: 5V, class B: 3V, class C: 1. 8V
)are categorized. Of these, the IC card only needs to support at least one voltage class, and may support a plurality of voltage classes. If the voltage applied from the reading device (reader / writer), which is an external device, matches the operation guarantee voltage of the IC card, the process can be executed without malfunction. In addition, a reader compliant with ISO / IEC 7816-3 selects an arbitrary voltage class and activates the IC card. If the initial response information (ATR (Answer To Reset)) is not responded from the IC card, the reading device deactivates the IC card or selects another voltage class and tries to activate again. Good. When the initial response information is responded, the reading device confirms that the voltage class supported by the IC card is displayed in the initial response information. If the voltage class is displayed in the initial response information, the reader selects an appropriate voltage class from the voltage class and reactivates it (if the currently applied voltage class is included, it reads it). May be maintained).

On the other hand, if the voltage class is not displayed in the initial response information, the reading device maintains the currently applied voltage class. In that case, the reader may select another voltage class and activate again if it does not operate during the message exchange performed after confirmation of the initial response information. For example, it is assumed that a PC logon security management system using an IC card operates on Windows XP (registered trademark). This IC card guarantees the operation only when the supplied voltage is 5 V, and the initial response information does not display the voltage class for compatibility with other products. When the reading device applies 5V, the IC card responds with initial response information, and the subsequent message exchange is continued and executed normally, so that the IC card operates stably. However, when the OS is changed to Windows 7 (registered trademark), the reader driver is upgraded, and the reader selects the voltage class in the order of class C (1.8V) → class B (3V) → class A (5V). Then, try to activate. In this case, for example, since no IC card was operated in class C (1.8V), the reader changed the voltage class to class B (3V) and tried to activate again. Responded with initial response information. However, since the voltage class is not displayed in the initial response information and the subsequent message exchange did not stop the operation, the class B (3V) was used. However, when the IC card executes cryptographic computation, there is a possibility that a problem of responding an erroneous computation result may occur because of insufficient supply power. This is because the IC card may operate even if the voltage is not guaranteed to operate, as in the case of general industrial products that are driven by electric power. For example, an operation as expected may be possible, but when processing that uses power extremely, such as cryptographic computation, is executed, there is a possibility of malfunction if the operation guarantee voltage is not met. At that time, if the IC card stops operating, the reader can select another voltage class according to the default operation of ISO 7816-3 and activate it again. However, if a malfunction is detected and an error status is returned, the reader according to ISO7816-3 cannot select an appropriate voltage class. In order to avoid this, the voltage class should be displayed in the initial response information. However, depending on the system requirements, the voltage class may not be displayed in the initial response information to ensure compatibility. Displaying such a voltage class is merely an option. For example, in the case of a closed system in which the operating voltage of the IC card is known, the voltage class may not be displayed in the initial response information. On the other hand, in Patent Document 1, information indicating the range of the power supply voltage is input from the outside, it is determined whether or not the voltage range specified by the information satisfies the operation guarantee voltage, and the operation guarantee voltage is not satisfied A memory card that blocks signal input / output from / to the outside is disclosed. According to this, even if the external power supply is incompatible with the operation guarantee voltage, it is possible to prevent malfunction due to the halfway level of the operation power supply.

JP 2000-250665 A

  As described above, in order for the reading device to select an appropriate voltage class and apply a voltage, the IC card does not respond with initial response information when an inappropriate voltage is applied, or the initial response information is a response. However, the processing must be stopped during the subsequent message exchange, or the voltage class must be displayed in the initial response information to which the IC card responds. However, if the initial response information is not responded, the IC card does not operate in an operating environment with a special reading device that operates only in a single voltage class. Therefore, it takes a lot of labor to identify the cause of the malfunction. become. In addition, if the initial response information is responded but the processing is to be stopped during the subsequent message exchange, the reader must try all three voltage classes as the worst case, and the time until the appropriate class is determined. It takes. Also, from the viewpoint of ensuring compatibility, in an environment where the IC card operates normally, in a system that does not allow the display of the voltage class in the initial response information, even if the voltage class is not guaranteed to operate. If the IC card responds with the initial response information, it will appear as if it is operating normally. Even if the IC card malfunctions due to an inappropriate voltage class, the voltage must be changed. I can't. On the other hand, in Japanese Patent Laid-Open No. 2004-228561, the reader must take a measure of transmitting information indicating the range of the power supply voltage to the IC card, and there are some readers that are difficult to deal with.

  Therefore, the present invention eliminates these situations and provides information for guiding the voltage to an appropriate voltage even when a voltage whose operation cannot be guaranteed is supplied from an external device such as a reader. It is an object to provide an information processing apparatus, an initial response method, and an IC card.

  In order to solve the above-mentioned problem, the invention according to claim 1 is an information processing apparatus capable of communicating with an external device, wherein the receiving unit receives a reset signal from the external device, and the reset signal is A determination unit configured to determine a voltage applied from the external device at a received timing; and a response unit configured to respond to the external device with initial response information with respect to the reset signal. When the determined voltage is not a preset operation guarantee voltage, the initial response information indicating the voltage class of the operation guarantee voltage is returned, and the voltage discriminated by the discrimination means is the operation guarantee voltage. The initial response information that does not display the voltage class of the operation guarantee voltage is returned.

  According to a second aspect of the present invention, in the information processing apparatus according to the first aspect, the response means includes any one of the plurality of operation guarantee voltages that are different from each other in voltage determined by the discrimination means. The initial response information indicating the voltage class of the operation guarantee voltage is returned when the voltage is not a voltage, and the voltage class of the operation guarantee voltage is not displayed when the operation guarantee voltage is any of the operation guarantee voltages. The initial response information is returned.

  The invention according to claim 3 is an initial response method executed by a computer included in an information processing apparatus capable of communicating with an external device, the step of receiving a reset signal from the external device, and the reset A step of determining a voltage applied from the external device at a timing when a signal is received; and initial response information for displaying a voltage class of the operation guaranteed voltage when the determined voltage is not a preset operation guaranteed voltage. Responding to the external device, and responding to the external device initial response information not displaying the voltage class of the guaranteed operation voltage when the determined voltage is the guaranteed operation voltage. And

  The invention according to claim 4 is an IC card that can communicate with an external device, and includes a receiving unit that receives a reset signal from the external device, and a timing at which the reset signal is received from the external device. A discriminating unit that discriminates the applied voltage; and a response unit that responds to the external device with initial response information for the reset signal. The response unit is preset with the voltage discriminated by the discriminating unit. In response to the initial response information for displaying the voltage class of the operation guaranteed voltage when the voltage is not the operation guaranteed voltage, the voltage class of the operation guaranteed voltage is displayed when the voltage determined by the determination unit is the operation guaranteed voltage. The initial response information is not responded.

  According to the present invention, even when a voltage whose operation cannot be guaranteed is supplied from an external device, information for inducing it to an appropriate voltage can be presented.

1 is a diagram illustrating a schematic configuration example of an IC card 1. FIG. (A) is a flowchart which shows an example of the initial response process of CPU11, (B) is a flowchart which shows the application example of the initial response process of CPU11.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The embodiment described below is an embodiment when the present invention is applied to an IC card.

  First, with reference to FIG. 1, the configuration and functions of the IC card according to the present embodiment will be described. FIG. 1 is a diagram illustrating a schematic configuration example of the IC card 1. The IC card 1 can be applied as an IC card mounted on a portable terminal such as a mobile phone or a smart phone, in addition to an IC card used in various fields such as finance, communication, and traffic. The IC card 1 can communicate with the reading device 2 (an example of an external device).

As shown in FIG. 1, an IC chip C (an example of an information processing apparatus of the present invention) mounted on an IC card 1 includes a CPU (Central Processing Unit) 11, a nonvolatile memory 12, a RAM (Random
Access Memory) 13, a voltage detection register 14, a voltage sensor 15, an I / O port 16, and the like. The nonvolatile memory 12 is, for example, a flash memory. The IC chip C may be provided with a ROM (Read Only Memory). Further, the IC chip C includes eight terminals C1 to C8 defined by ISO / IEC7816 or the like. 1, a power supply terminal (VCC) C1 to which a voltage is applied from the reading device 2, a reset terminal (RST) C2 that receives a reset signal from the reading device 2, and a clock signal from the reading device 2 are received. A clock terminal (CLK) C3 to be connected, a ground terminal (GND) C5 to be grounded, and an I / O terminal (I / O) C7 to receive a command from the reading device 2 are shown. In the example of FIG. 1, an example of a contact type IC card is shown. However, by approaching an external device, a non-contact type IC that operates by being supplied with power (voltage applied) in a non-connected state using a magnetic field as energy. It may be a card.

The nonvolatile memory 12 stores an operating system and various application programs. The voltage sensor 15 is mounted on an analog control circuit, detects the voltage applied from the reading device 2 to the power supply terminal (VCC) C1, and determines whether the voltage is class A (5V) or class B (3V). It is a sensor that expresses whether it is class C (1.8V) or other. The voltage sensor 15 sets (holds) a value corresponding to the detected voltage in the voltage detection register 14. For example, “0” for class A (5V), “1” for class B (3V), “2” for class C (1.8V), “3” otherwise. A value is set in the voltage detection register 14.

  The CPU 11 receives the command from the reading device 2 via the I / O terminal (I / O) C7 and the I / O port 16 by executing the operating system and various application programs, and performs processing according to the command. Execute. The CPU 11 functions as a receiving unit, a determining unit, and a responding unit in the present invention. Accordingly, the CPU 11 receives a reset signal from the reading device 2 via the reset terminal (RST) C2, and responds to the reading device 2 with initial response information for the received reset signal. Further, the CPU 11 reads the value from the voltage detection register 14 at the timing when the reset signal is received, and determines the voltage applied from the reading device 2. Then, the CPU 11 responds to the reading device 2 with initial response information indicating the voltage class of the operation guarantee voltage when the determined voltage is not a preset operation guarantee voltage. On the other hand, when the determined voltage is an operation guarantee voltage, the CPU 11 responds with initial response information not displaying the voltage class of the operation guarantee voltage.

  Next, an initial response process of the CPU 11 in the IC card 1 according to the present embodiment will be described with reference to FIG. FIG. 2A is a flowchart illustrating an example of an initial response process of the CPU 11. FIG. 2B is a flowchart illustrating an application example of the initial response process of the CPU 11.

The initial response process shown in FIG. 2A is started when a reset signal is received by the reading device 2, for example. In the example of FIG. 2A, it is assumed that the operation guarantee voltage of the IC card 1 is only class A (5 V). When the initial response process shown in FIG. 2A is started, the CPU 11 reads a value from the voltage detection register 14 (step S1), and determines the voltage applied from the reading device 2. For example, the CPU 11 class A (5V) if the read value is "0", class B (3V) if "1", class C (1.8V) if "2", otherwise It is determined that none of the above applies. Thus, the CPU 11 determines whether or not the value read from the voltage detection register 14 indicates class A (5V) (step S2). When the CPU 11 determines that the value read from the voltage detection register 14 does not indicate class A (5 V) (step S2: NO), that is, when the determined voltage is not the operation guaranteed voltage, the operation guaranteed voltage The initial response information for displaying the voltage class is returned to the reader 2 (step S3). That is, initial response information including class information indicating the voltage class is transmitted to the reading device 2. On the other hand, when the CPU 11 determines that the value read from the voltage detection register 14 indicates class A (5 V) (step S2: YES), that is, when the determined voltage is the operation guarantee voltage, the operation guarantee is performed. Initial response information not displaying the voltage class of the voltage is returned to the reading device 2 (step S4). That is, initial response information (regular initial response information) that does not include class information indicating the voltage class is transmitted to the reading device 2.

  As described above, when the IC card 1 guarantees the operation only in the class A, when the class A is applied, the initial response information not displaying the voltage class is transmitted and the process is continued, and other classes are applied. Then, it is possible to guide to any appropriate voltage class by transmitting the initial response information indicating the voltage class. As a result, the IC card 1 can operate in an appropriate voltage class.

  Next, the initial response process shown in FIG. 2B is started, for example, when a reset signal is received by the reading apparatus 2 as in FIG. 2A. In the example of FIG. 2B, it is assumed that the operation guarantee voltages of the IC card 1 are all of classes A to C. Then, when the initial response process shown in FIG. 2B is started, the CPU 11 reads the value from the voltage detection register 14 (step S11), and determines the voltage applied from the reading device 2. Then, the CPU 11 determines whether or not the value read from the voltage detection register 14 indicates class A (5V) (step S12). When the CPU 11 determines that the value read from the voltage detection register 14 does not indicate class A (5V) (step S12: NO), the value read from the voltage detection register 14 is class B (3V). Is determined (step S13). On the other hand, if the CPU 11 determines that the value read from the voltage detection register 14 indicates class A (5 V) (step S12: YES), the CPU 11 reads initial response information that does not display the voltage class of the guaranteed operation voltage. Response to 2 (step S16).

  If the CPU 11 determines that the value read from the voltage detection register 14 does not indicate class B (3V) (step S13: NO), the value read from the voltage detection register 14 is class C (1.8V). ) Is determined (step S14). On the other hand, if the CPU 11 determines that the value read from the voltage detection register 14 indicates class B (3V) (step S13: YES), the CPU 11 reads initial response information that does not display the voltage class of the guaranteed operation voltage. Response to 2 (step S16).

  If the CPU 11 determines that the value read from the voltage detection register 14 does not indicate class C (1.8 V) (step S14: NO), the CPU 11 reads the initial response information indicating the voltage class of the guaranteed operation voltage. It responds to the apparatus 2 (step S15). On the other hand, when the CPU 11 determines that the value read from the voltage detection register 14 indicates class C (1.8 V) (step S14: YES), the CPU 11 reads initial response information that does not display the voltage class of the guaranteed operation voltage. It responds to the apparatus 2 (step S16).

  As described above, when the IC card 1 guarantees the operation in all of the classes A, B, and C, when any of the voltages of the classes A, B, and C is applied (that is, a plurality of operation guarantee voltages different from each other). When the initial response information not indicating the voltage class is transmitted and a voltage that is not one of the classes A, B, and C is applied (that is, a plurality of operation guarantee voltages different from each other). The initial response information indicating the voltage class can be transmitted and guided to any appropriate class (if it is not any of the guaranteed operating voltages).

  As described above, according to the above embodiment, for example, an IC card used in a system that does not allow display of a voltage class in the initial response information is connected to a different system, and a voltage class that does not guarantee operation is applied. In this case, it is possible to transmit the initial response information indicating the voltage class to the reading device 2, to guide to the appropriate voltage class, and to operate normally. Therefore, even when a voltage whose operation cannot be guaranteed is supplied from the reading device 2, information for guiding it to an appropriate voltage can be presented.

1 IC card 2 reader 11 CPU
12 Nonvolatile memory 13 RAM
14 Voltage detection register 15 Voltage sensor 16 I / O port

Claims (4)

An information processing apparatus capable of communicating with an external device,
Receiving means for receiving a reset signal from the external device;
Determining means for determining a voltage applied from the external device at a timing when the reset signal is received;
Response means for responding to the external device with initial response information for the reset signal;
With
The response means responds with the initial response information indicating the voltage class of the operation guaranteed voltage when the voltage determined by the determination means is not a preset operation guaranteed voltage, and the voltage determined by the determination means An information processing apparatus that responds with the initial response information that does not display a voltage class of the operation guarantee voltage when is an operation guarantee voltage.   The response means displays the initial response information for displaying a voltage class of the operation guarantee voltage when the voltage discriminated by the discrimination means is not any of the operation guarantee voltages among the plurality of operation guarantee voltages different from each other. 2. The information processing according to claim 1, wherein the initial response information that does not display a voltage class of the operation guarantee voltage is returned when the operation guarantee voltage is one of the operation guarantee voltages. apparatus. An initial response method executed by a computer included in an information processing apparatus capable of communicating with an external device,
Receiving a reset signal from the external device;
Determining a voltage applied from the external device at a timing when the reset signal is received;
When the determined voltage is not a preset operation guarantee voltage, the initial response information indicating the voltage class of the operation guarantee voltage is returned to the external device, and the determined voltage is the operation guarantee voltage Responding to the external device with initial response information that does not display the voltage class of the operation-guaranteed voltage,
Including an initial response method. An IC card that can communicate with an external device,
Receiving means for receiving a reset signal from the external device;
Determining means for determining a voltage applied from the external device at a timing when the reset signal is received;
Response means for responding to the external device with initial response information for the reset signal;
With
The response means responds with the initial response information indicating the voltage class of the operation guaranteed voltage when the voltage determined by the determination means is not a preset operation guaranteed voltage, and the voltage determined by the determination means An IC card that responds with the initial response information that does not display the voltage class of the operation guarantee voltage when is the operation guarantee voltage.

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