JP4527434B2 - Portable information storage medium and program thereof - Google Patents

Description

  The present invention relates to a portable information storage medium such as an IC card and a program thereof. The portable information storage medium includes an IC card, a SIM (Subscriber Identity Module), a UIM (User Identity Module), an IC tag, and the like, and a communication unit and an interface that mediate communication between the external terminal and the IC. Tamper resistance that requires predetermined processing such as transmission of a command (processing request) by a predetermined external terminal, such as the assumption that the external terminal is authenticated by this IC in order to access internal data It is a portable information processing apparatus with high cost. Tamper resistance is resistance to attacks on internal secret information from the outside, such as tampering with internal secret information, unauthorized changes, leakage to the outside, and the like.

In recent years, in mobile communication terminals such as mobile phones, IC cards for incorporation in devices such as subscriber identification modules such as SIMs and UIMs have begun to spread. For example, when a purchaser intends to purchase a product from a vending machine using a mobile communication terminal, the vending machine reads and recognizes personal attribute information written in an IC card attached to the mobile communication terminal. In addition, there is a method for identifying a user layer by determining whether or not the purchaser is subject to restriction on purchase of goods by comparing with a preset purchaser restriction condition (see, for example, Patent Document 1). .
In addition, an authentication specification “WLAN-SIM V0.1” for securing a security in a wireless LAN by incorporating a UIM in a device such as a PDA is being studied by an industry group WLAN Smart Card Consortium. In the future, not only portable information processing devices such as mobile phones and PDAs but also various control devices connected to information home appliances and networks are likely to adopt such UIMs as security modules.
Software for embedded applications for controlling the microcomputers built into these devices prevents delays in responding to other processes while being involved in one process, and responds within a certain period of time. Because of the necessity that must be met, a dedicated real-time operating system (hereinafter referred to as “OS”) is employed. A real-time OS places importance on executing processing in real time, is an OS that implements a function for that purpose, and has a function for predicting a required processing time and a target time even when multiple processing requests occur simultaneously. A mechanism for completing the process is needed.
When performing authentication or encryption processing using a UIM, an OS of an external terminal such as these devices transmits a command and data to the UIM and waits for a response from the UIM.
JP 2002-109440 A

However, since the response time is not guaranteed, there is a problem that it is difficult to predict the response time of the entire system.
On the other hand, ISO7816 part3 (hereinafter, “partN” is referred to as “−N”) and JIS X6304 define a communication method called “T = 1” (asynchronous half-duplex block communication protocol). When the IC card cannot return a response within a certain time after receiving the command, it is determined that a WTX (waiting time extension) response is always returned to the external terminal. This method is effective for the terminal to detect a state in which the IC card has stopped processing for some reason and has become unresponsive.
However, since the response time limit is determined at the start of communication, there is a problem that the response time limit cannot be changed for each command.
Also, it is a time extension to the end, and there is a possibility that it will be extended for several seconds one after another without a result, and the processing of the external terminal may be awaited.
Furthermore, even if the UIM for control is used in a third-generation mobile phone, it is replaced, so there are multiple types of IC chips that can communicate with external terminals, and the processing speed depends on the type of IC chip. Different cases are also possible. Therefore, in the mechanism of T = 1, there is a problem that the external terminal cannot determine how many seconds it should wait and becomes more difficult to deal with.

  An object of the present invention is to provide a portable information storage medium capable of facilitating, improving efficiency, and speeding up processing, and a program thereof.

The present invention solves the above problems by the following means. In order to facilitate understanding, description will be made with reference numerals corresponding to the embodiments of the present invention, but the present invention is not limited to this. That is, the invention of claim 1 comprises command receiving means (11) for receiving a command from the external terminal (20), and processing means (131) for performing processing in accordance with the command received by the command receiving means. In the portable information storage medium, when the command receiving unit receives a command containing a time limit including the command and processing time limit information, the processing unit performs a process performed according to the command included in the time limit containing command. , Processing time limit determining means (12, 132, 134) for determining whether or not to end within the processing time limit indicated by the processing time limit information , and prediction of time required for processing performed by the processing means in response to the command. A predicted processing time storage unit (14-2) for storing a predicted processing time, and the processing time limit determining unit receives a time limit containing command by the command receiving unit , Based on the predicted processing time stored in the predicted processing time storage means and the processing time limit indicated by the processing time limit information included in the time limit containing instruction, and the processing time limit indicated by the processing time limit information included in the time limit containing command. It is a portable information storage medium (10 −2 ) characterized by performing the determination (S380, S540, S550, S560) .

A second aspect of the present invention, in the portable information storage medium of claim 1, when it is determined that whether by the processing time limit determining means, expired notification means (11 and 131 for notifying the outside terminal A portable information storage medium (10-2).

A third aspect of the present invention, in the portable information storage medium of claim 2, wherein the processing means, when it is determined that whether by the processing time limit determining means, in accordance with the instructions contained in the deadline containing instructions The portable information storage medium ( 10-2) is characterized in that the processing is stopped and the expiration date notifying means notifies the external terminal that the processing is stopped.

According to a fourth aspect of the present invention, in the portable information storage medium according to any one of the first to third aspects, the command receiving means has a format similar to that of other commands, and a data portion thereof. instruction receiving a previous SL-life limit containing instructions stored in a nested condition, the processing time limit determining means, depending on the instructions stored in the data portion of the deadline containing instructions received by said instruction reception means processing performed by the processing means Te is, portable information storage medium to determine whether to terminate before SL-life limit contained in the processing time limit processing time limit information indicating contained in the instruction, characterized by (1 0 -2).

The invention of claim 5 is a command receiving procedure ( S330, S530) for receiving a command from an external terminal, and a processing procedure ( S390, S400, S570, S580) for performing processing according to the command received in the command receiving procedure. ) Is executed in the portable information storage medium ( 10-2), in the instruction reception procedure, when a deadline containing instruction including a command and processing deadline information is received, A process time limit determining procedure ( S380, S420, S540, S540) for determining whether or not the process performed in response to the command included in the time limit containing instruction in the process procedure ends within the process time limit indicated by the process time limit information. S550, S560), and the portable information storage medium has a predicted processing time that is a prediction of a time required for processing performed according to a command in the processing procedure. And a predicted processing time storage means (14-2) for storing, the processing deadline determination procedure is stored by the predicted processing time storage means when a deadline containing command is received in the command receiving procedure. The determination is made based on the predicted processing time required for processing the instruction included in the term-containing instruction and the processing time limit indicated by the processing time limit information included in the term-containing instruction (S380, S540, S550, S560). ) , A portable information storage medium program characterized by

According to a sixth aspect of the present invention, in the portable information storage medium program according to the fifth aspect , when it is determined to be NO in the processing time limit determination procedure, an overdue notification procedure (S440, S610) providing the a program of the portable information storage medium characterized.

According to a seventh aspect of the invention, in the program for the portable information storage medium according to the sixth aspect , when the processing procedure is determined to be NO in the processing deadline determination procedure, the program includes a command included in the deadline containing instruction. In the portable information storage medium program, the process of stopping the expiration date is notified and the external terminal is notified that the process has been stopped.

The invention of claim 8 is the portable information storage medium program according to any one of claims 5 to 7 , wherein the instruction receiving procedure has the same format as other instructions, receiving a previous SL-life limit containing instructions instruct the data unit is stored in a nested condition, the processing time limit determination procedure, the instruction commands stored in the data portion of the deadline containing command received in the receiving procedure the processing process performed in steps, the program of the portable information storage medium to determine whether to terminate before SL-life limit contained in the processing time limit processing time limit information indicating contained in the instruction, and wherein in response to It is.

According to the portable information storage medium and the program thereof according to the present invention, the following effects can be obtained.
(1) By receiving a time limit containing command including processing time limit information and determining whether or not the processing is completed within the processing time limit, an appropriate response time limit according to the processing content of each command is set on the external terminal side It can be set in advance, and the processing is facilitated, efficient and quick. In the future, when the OS installed in the portable information storage medium becomes multitasking, if there is a margin for the processing deadline, it will respond after performing other processing, etc. And speed up. Furthermore, when there is a margin in the processing deadline or when the processing speed is not required, it is possible to determine whether to operate in the low power consumption mode.
(2) By detecting that processing has not ended within the processing time limit and notifying the external terminal to that effect, the external terminal stops processing for the portable information storage medium and performs other processing. The processing speed can be assured, and the processing can be made smoother, more efficient and faster.
(3) Based on the predicted processing time and the processing time limit, it can be predicted whether the processing will be completed before the processing is performed by determining whether the processing is completed within the processing time limit. , To facilitate, improve efficiency and speed of processing.
(4) In addition, when it is predicted that the process will not be completed, the external terminal can notify the external terminal so that the external terminal can stop the process for the portable information storage medium and perform other processes. To ensure smooth, efficient, and quick processing.
(5) When it is determined that the process does not end within the process deadline, the process is stopped, so that another command can be accepted, and the next command of the external terminal can be dealt with. And speed up.
(6) Receives a processing deadline containing instruction having a format similar to that of other instructions such as a conventional command and stored in a data portion in a nested state, and performs processing according to the processing deadline containing instruction As a result, the portable information storage medium can identify the processing deadline-containing command in the same manner as other commands, and improves versatility.

  The present invention provides a portable information storage comprising a command receiving unit that receives a command from an external terminal and a processing unit that performs a process in accordance with the received command, with the aim of facilitating, improving efficiency, and speeding up the processing. In the medium, when a processing deadline containing command including a command and processing deadline information and having the same format as other commands is received, processing performed by the processing unit according to the command included in the processing deadline containing command A deadline detection unit that detects that the processing has not ended within the processing deadline, and a response transmission unit that sends a response to that effect to the external terminal when the deadline detection unit detects that the processing has not ended And the processing unit is implemented by interrupting the processing according to the command when the expiration detection unit detects that the processing has not ended. To.

Hereinafter, the present invention will be described in more detail with reference to the drawings.
FIG. 1 is a block diagram showing the configuration of a portable information storage medium according to the present invention. Note that the portable information storage medium in this embodiment is the IC card 10.
As shown in FIG. 1, the IC card 10 can communicate with an external terminal 20 that is an information processing apparatus including a reader / writer (hereinafter referred to as “R / W”). Is a portable information storage medium that receives a command and performs processing according to the command, and returns a processing result as a response to the external terminal 20. The IC card 10 conforms to ISO7816-4 for convenience of explanation. In addition, which standard is complied with is not limited.
The IC card 10 includes an I / F 11, a timer interrupt unit 12, a CPU 13, a memory 14, and the like, and each unit 11, 12, 14 is connected to the CPU 13.
The I / F 11 includes a contact terminal that comes into contact with the R / W contact terminal when the IC card 10 is inserted into the R / W of the external terminal 20, and realizes contact-type communication between the external terminal 20 and the CPU 13. This is an interface circuit. As long as communication with the external terminal 20 can be realized, the communication method capable of the I / F 11 may be either contact type, non-contact type, or both, and is not limited.

The timer interrupt unit 12 includes a timer and the like. The timer interrupt unit 12 is a circuit that generates an interrupt when a time set by the interrupt processing unit 132 of the CPU 13 has elapsed. The processing of the processing unit 131 is completed within the set time. Detect that you did not. The timer interrupt unit 12 performs hardware interrupt, but may include a timer interrupt unit that performs software interrupt instead of the timer interrupt unit 12. As long as a predetermined process is forcibly performed when the specified time has elapsed, the implementation method is not limited.
The CPU 13 executes a program stored in the memory 14 to realize a processing unit 131, an interrupt processing unit 132, and the like, and performs overall control of the IC card 10.
The processing unit 131 performs processing according to the command received from the external terminal 20, and returns the processing result as a response. In addition, when there is an interruption by the timer interruption unit 12, the processing unit 131 interrupts the process and performs a predetermined process.
The interrupt processing unit 132 performs timer setting such as starting the timer of the timer interrupt unit 12 and adjusting the interrupt time to the response time limit specified by the command. The interrupt processing unit 132 and the timer interrupt unit 12 detect that the processing of the processing unit 131 has not ended within the response time limit.

  The memory 14 includes a RAM that is a volatile memory used as a work area for the CPU 13 to perform processing, a ROM that is a nonvolatile read-only memory for storing basic software such as an OS, a user work area, a program, and the like. A storage device includes a nonvolatile memory that is a rewritable nonvolatile memory such as an EEPROM, a flash memory, and an FRAM used as an area. The memory 14 stores programs such as the OS and applications, data necessary for executing the programs, and the like.

FIG. 2 is a diagram showing a format of a command that can be used in the IC card 10. FIG. 2 (a) shows a command format conforming to ISO 7816-4, and FIG. 2 shows the format of a real-time command implemented in the external terminal 20.
The IC card 10 is compliant with ISO7816-4. As shown in FIG. 2A, in ISO7816-4, a command sent from the external terminal 20 to the IC card 10 includes a header part (header) including CLA, INS, P1, and P2, a data part, and the like. It consists of a main body. CLA is an instruction class and mainly indicates whether or not the command conforms to ISO. INS is an instruction code and indicates the type of command, and CLA and INS constitute command identification information. P1 and P2 are parameters in this command, Lc indicates the length of the data part, the data part is a received byte string, and Le is the maximum expected in the data part of the response to this command. Indicates the number of bytes. ISO 7816-4 employs four types of command formats (C1 to C4) that differ depending on the presence or absence of Lc and the data part and the presence or absence of Le.

For example, the VERIFY command is as follows.
`` 0x00 20 00 01 04 0A 0B 0C 0D ''
The VERIFY command is a command for sending a password or the like from the external terminal 20 and requesting the IC card 10 to collate such as collation with a registered password. Used to determine whether to do. In the above VERYFY command, the collation target is “0A 0B 0C 0D” and is stored in the data portion. Also, CLA and INS are “00 20”, P1 and P2 are “00 01”, and the length of the data part is 4 bytes.

As shown in FIG. 2B, the real-time command stores identification information for identifying the real-time command in the heading part CLA and INS as in the ISO 7816-4 command. Here, as an example, CLA is set to “0xD0” and INS is set to “0x00”, which indicates a real-time command.
The first 4 bytes of the data part of the real-time command are assigned to the response time limit parameter. The unit of the response time limit is, for example, microseconds, and may be the number of clocks, and is not limited. In the real-time command, the conventional command is nested (nested structure) after the fifth byte of the data portion, that is, the command is included and stored as it is.
The response time limit parameter is processing time limit information indicating the time limit of processing, and the response time limit parameter specified here is the time from the start of command reception to the start of response transmission.

Here, the VERIFY command implemented by the OS of the IC card 10 and the VERIFY command corresponding to the real-time command will be specifically described. The VERIFY command here requests fingerprint verification instead of a password. In addition, the processing time varies depending on the contents of the fingerprint data, such as a long processing time. The data length of the fingerprint data is 128 bytes.
A normal VERIFY command is as follows.
“0x00 20 00 01 80 xx xx xx… xx”
“0x80” is hexadecimal notation with a data length of 128 bytes, and “xx xx... Xx” is arbitrary data to be subjected to fingerprint verification of 128 bytes.

On the other hand, the VERIFY command corresponding to the real-time command is as follows.
“D0 00 00 00 89 yy yy yy yy 00 20 00 01 80 xx xx… xx”
“Yy ... yy” is a 4-byte response time limit parameter. The unit of the response time limit is microseconds (one millionth of a second). “0x89” is a hexadecimal notation with a data length of 128 + 4 + 5 = 137 (bytes).
For example, when the time limit is set to 1 second, in hexadecimal notation, 1 second = 1000000 μs = “00 0F 42 40”, so the VERIFY command corresponding to the real-time command is “D0 00 00 00 89 00 0F”. 42 40 00 20 00 01 80 xx xx… xx ”
It becomes.

  The external terminal 20 includes an R / W or the like for realizing communication with the IC card 10, can communicate with the IC card 10 inserted in the R / W, and is an information processing equipped with a real-time OS. Device. The external terminal 20 wants to perform processing by sending a certain command to the IC card 10, but in order to predict the response time, it is assumed that some response is desired within a certain fixed time. The external terminal 20 stores the command (command to be processed) in the data part of the real-time command (from the 5th byte), sets a response time limit parameter, and transmits it to the IC card 10.

FIG. 3 is a flowchart showing the operation of the portable information storage medium and the program of the portable information storage medium according to the present invention. Hereinafter, the processing of the CPU 13 of the IC card 10 will be mainly described.
As shown in FIG. 3, in step 110 (hereinafter, “step” is referred to as “S”), the IC card 10 is inserted into the external terminal 20, receives power supply, receives a reset signal, etc. It starts up, starts processing, and enters a command reception waiting state (S120).
In S <b> 130, the IC card 10 receives a command from the external terminal 20. The interrupt processing unit 132 starts the timer of the timer interrupt unit 12 from the start of reception. The processing unit 131 analyzes the content of the received command and determines whether it is a real-time command based on the CLA and INS. If it is not a real-time command (in the case of a normal command), the processing unit 131 executes processing corresponding to this command (S180). The processing unit 131 sets the processing result in the transmission buffer (S190), transmits the buffer content to the external terminal 20 as a response, and the IC card 10 again enters a command reception waiting state (S120).

  When the real time command is received in S130, the interrupt processing unit 132 sets the interrupt time of the timer interrupt unit 12 in accordance with the response time limit stored in the first 4 bytes of the data part of the real time command (S160). ). The processing unit 131 extracts a command from the data part of the real-time command (S170) and executes this command (S180). If the response time limit elapses during command processing (S160 to S180) (S210), an interrupt is generated by the timer interrupt unit 12, and the processing unit 131 interrupts processing and sets an NG message in the transmission buffer. (S220), the buffer contents are transmitted to the external terminal 20, and the processing is not completed, and notification is given that it has been interrupted (S200). After the notification, the IC card 10 again enters a command waiting state (S120).

The flow of processing after the IC card 10 is inserted into the external terminal 20, power is supplied, and ATR (initial response) from the IC card 10 is returned (after S120) will be specifically described with reference to FIG. .
First, an example in which processing is in time for the response time limit will be described.
The external terminal 20 transmits a VERIFY command corresponding to the following real-time command to the IC card 10. It should be noted that the response time limit is 1 second, and the fingerprint data is correctly verified and is 128 bytes “xx xx... Xx”.
“D0 00 00 00 89 00 0F 42 40 00 20 00 01 80 xx xx… xx”

The IC card 10 receives this real time command, and the interrupt processing unit 132 starts the timer of the timer interrupt unit 12 (from 0) in accordance with the start of reception (S130).
The processing unit 131 checks the CLA and INS of the received command and determines that it is a real-time command because it is “D00” (S140, S150). The interrupt processing unit 132 reads the response time limit (1 second) specified by 4 bytes from the 6th byte from the beginning, and sets the interrupt of the timer interrupt unit 12 so that an interrupt is generated when the time expires (1 second) = 1000000 microseconds = "00 0F 42 40").
The processing unit 131 extracts the original command “0x00 20 00 01...” After the 10th byte from the head from the real-time command, identifies it as a VERIFY command, and executes it (S180). Since the processing unit 131 has successfully verified, the processing result of OK (matching match) is stored in the transmission buffer (S190) and transmitted to the external terminal 20 (S200).

Next, an example in which processing is not in time for the response time limit will be described. Hereinafter, the description will focus on the points different from the above-described example, and overlapping descriptions will be omitted as appropriate.
The external terminal 20 transmits a VERIFY command corresponding to the real time command to the IC card 10. Note that the response time limit is 1 second, and fingerprint data is correctly verified. The fingerprint data is 128 bytes of “xx xx... Xx”, and it takes 1.5 seconds for the verification process in the IC card 10.
Since 1 second has elapsed during the verification process by the processing unit 131 (S180), an interrupt is generated by the timer interrupt unit 12 (S210), and the processing unit 131 interrupts the verification process and indicates that the process is interrupted. Is stored in the transmission buffer (S220) and transmitted to the external terminal 20 (S200).

An example in which a command that is not a real-time command, such as an ISO 7816-4 command, is received from the external terminal 20 will be described.
The external terminal 20 transmits a normal VERIFY command shown below to the IC card 10. It is assumed that the fingerprint data is correctly collated, the fingerprint data is 128 bytes of “xx xx... Xx”, and the collation processing in the IC card 10 takes 1.5 seconds.
“00 20 00 01 80 xx xx… xx”
The IC card 10 receives this real time command, and the interrupt processing unit 132 starts the timer of the timer interrupt unit 12 (from 0) in accordance with the start of reception (S130).
The processing unit 131 checks the CLA and INS of the received command and determines that it is not a real-time command but a normal VERIFY command because it is “00 20” (S140, S150). The processing unit 131 executes the VERIFY command (S180), and since the collation has been correctly performed, the processing result of OK (collation match) is stored in the transmission buffer (S190) and transmitted to the external terminal 20 (S200).

As described above, according to the present embodiment, the IC card 10 receives the real-time command including the response time limit parameter and can respond within the response time limit, that is, whether or not the process ends within the processing time limit. Therefore, an appropriate response time limit according to the processing content of each command can be set in advance on the external terminal 20 side, and it has become possible to achieve smooth, efficient, and quick processing. .
In addition, since the IC card 10 notifies the external terminal 20 that the processing has been interrupted, the external terminal 20 can stop processing on the IC card 10 and perform other processing, thereby guaranteeing the processing speed. It has become possible to achieve smooth, efficient and quick processing.
In particular, the IC card 10 suspends processing when it cannot respond within the response time limit, and therefore is ready to accept other commands, and can deal with the next command of the external terminal 20, facilitating processing, It became possible to improve efficiency and speed.
Further, since the real-time command has the same format as other commands such as a command conforming to ISO7816-4, the IC card 10 can easily identify the real-time command like other commands, and can be used for versatility. It became possible to improve.

FIG. 4 is a block diagram showing the configuration of the portable information storage medium according to the present invention. In addition, the part which fulfill | performs the function similar to the Example mentioned above attaches | subjects the same code | symbol or the code | symbol unified at the end, and abbreviate | omits duplication description and drawing suitably.
As shown in FIG. 4, the IC card 10-2 has substantially the same configuration as the IC card 10 of the first embodiment, and includes a CPU 13-2, a memory 14-2, and the like.
The memory 14-2 stores a processing time table and the like in addition to the information stored in the memory 14 of the first embodiment.

FIG. 5 is a diagram showing a processing time table stored in the memory 14-2.
As shown in FIG. 5, the processing time table associates the identification information (CLA, INS) with the predicted processing time, which is the prediction of the time required for processing performed in response to this command, for each command such as VERYFY. I remember. As shown in FIG. 5, the processing time table stores a predicted time as the longest limit of processing time as the predicted processing time. The prediction processing time includes a prediction processing time in the normal mode and a prediction processing time in the low power consumption mode, and the low power consumption mode is an operation mode in which processing is performed while suppressing power for processing.
In this embodiment, for example, when a VERYFY command is received, the processing time of 0.5 seconds at the longest in the normal mode and the processing time of 1.5 seconds at the maximum in the low power consumption mode are required. It is predicted. This prediction processing time is set based on a prior test or the like.
The CPU 13-2 implements a mode switching unit 133, a processing time determination unit 134, and the like by executing a program stored in the memory 14-2. The mode switching unit 133 switches the operation mode, and the processing time determination unit 134 indicates whether or not the processing according to the command from the processing unit 131 is completed within a predetermined time. (See FIG. 6 described later).

FIG. 6 is a flowchart showing the operation of the portable information storage medium and the program of the portable information storage medium according to the present invention. Hereinafter, the processing of the CPU 13-2 of the IC card 10-2 will be mainly described.
From S300 to S370, the IC card 10-2 performs the same processing as S100 to S170 of the IC card 10 in the first embodiment.
In S380, the processing time determination unit 134 of the IC card 10-2 refers to the processing time table of the storage unit 14-2, and reads the predicted processing time in the low power consumption mode of the command extracted from the data part of the real-time command. Based on the predicted processing time, it is determined whether or not it is possible to respond within the response time limit in the low power consumption mode.

Specifically, a VERIFY command corresponding to the real-time command is received in S330, and the response time limit ([yy yy yy yy], see FIG. 2) of the data portion of the real-time command is 2 seconds (“00 1E 84 80 )), The processing time determination unit 134 reads the predicted processing time of the low power consumption mode of the VERIFY command from the processing time table and determines that the result is positive (since 1.5 seconds <2 seconds), that is, Judge that it will be in time even in the power saving mode.
If it is determined as positive in S380, the mode switching unit 133 switches the operation mode to the low power consumption mode, and the processing unit 131 executes the command (S400). If it is determined NO in S380, the processing unit 131 executes the command in the normal operation mode (S390). Hereinafter, the IC card 10-2 performs the same processing as the IC card 10 of the first embodiment (S410 to S440).
When the command received from the external terminal 20 is not a real time command, the IC card 10-2 executes the command in the low power consumption mode (S350, S400), but may execute the command in the normal mode. .

As described above, according to the present embodiment, in addition to the same effects as those of the first embodiment, the IC card 10-2 is low in power consumption when it is predicted that it can respond within the response time limit specified by the external terminal 20. Since the command is executed in the power mode, it is possible to facilitate the processing, increase the efficiency and speed, and reduce the power required for the processing of the IC card 10-2.
Also, in the future, when the OS mounted on the IC card 10-2 becomes multitasking, the IC card 10-2 responds after performing other processing if there is a margin for the response time limit [example] ; For example, in the case of a language that requires other processing such as memory organization (garbage collection) in parallel with the original command processing such as Java (registered trademark)] Therefore, it is possible to increase the efficiency and speed of processing.

(Modification)
The present invention is not limited to the embodiments described above, and various modifications and changes are possible, and these are also within the equivalent scope of the present invention. For example, in each embodiment, the IC cards 10 and 10-2 are exemplified as the portable information storage medium. However, the portable information storage medium is not limited to this, and other portable types such as UIM, SIM, and IC tag. It may be an information storage medium.

  In each embodiment, the real-time command includes response time limit data and limits the time until the response, but instead may include a processing time limit that limits the processing time, and indicates the processing deadline. If so, there is no limitation on how to specify the deadline with the real-time command.

  In the second embodiment, the IC card 10-2 may store a processing time table in which the predicted processing time is set in detail by the memory 14-2. For example, a prediction processing time may be set according to the amount of data stored in the data part of the VERIFY command. The accuracy of the determination of whether or not the response within the response time limit is possible in the low power consumption mode (S380), the finer response time limit can be set on the external terminal 20 side, etc. It is possible to speed up.

  In the second embodiment, when the processing time determination unit 134 of the IC card 10-2 receives the real-time command, the processing time determination unit 134 within the response time limit based on the predicted processing time in the normal mode of the command extracted from the data unit. You may determine whether you can respond. If it is determined as NO, the process is notified to the external terminal 20 without executing the command, so that the processing can be smoothed, made efficient, and speeded up.

7 and 8 are diagrams for explaining a modification of the second embodiment of the portable information storage medium and the program according to the present invention. FIG. 7 is an explanatory diagram for explaining the processing time table. These are flowcharts showing the operation of the portable information storage medium and the program of the portable information storage medium according to the present invention.
The IC card 10-2 stores a processing time table as shown in FIG. 7 in the memory 14-2. The processing time table stores the command identification information (CLA, INS) and the predicted processing time of the command in association with each other. The predicted processing time in the normal mode is set in the range of the predicted processing time, and the predicted processing time in the low power consumption mode is set as the longest limit of the processing time and the predicted time. In addition, the external terminal 20 transmits a real-time command storing the processing time limit instead of the response time limit to the IC card 10-2.

As shown in FIG. 8, the IC card 10-2 receives the real time command including the processing time limit (S530), and the processing time determination unit 134 determines that the processing time limit is the normal mode of the command extracted from this data part. It is determined whether it is within the range of the prediction processing time at (S540). If it is within the predicted processing time range, the processing unit 131 executes the command in the normal mode (S580). When the processing time limit is shorter than the predicted processing time, the processing unit 131 does not execute the command and notifies the external terminal 20 that the processing is not performed (processing is stopped) (S550, S600, S610). ). If the processing time limit is longer than the predicted processing time, the processing time determination unit 134 determines whether or not the predicted processing time in the low power consumption mode is within the processing time limit (S560). When it is determined that the processing unit 131 is affirmative, the processing unit 131 executes the command in the low power consumption mode (S570). When it is determined that the processing unit 131 determines that it is not, the processing unit 131 executes the command in the normal mode (S580). S590, S610).
When the IC card 10-2 determines that the processing does not end within the processing time limit, the IC card 10-2 notifies the external terminal 20 of the fact without executing the command. Can be achieved.

It is a block diagram which shows the structure of the portable information storage medium by this invention. Example 1 3 is a diagram illustrating a format of a command that can be used in the IC card 10. FIG. Example 1 It is a flowchart which shows the operation | movement of the portable information storage medium by this invention, and the program of a portable information storage medium. Example 1 It is a block diagram which shows the structure of the portable information storage medium by this invention. (Example 2) It is a figure which shows the processing time table which the memory 14-2 has memorize | stored. (Example 2) It is a flowchart which shows the operation | movement of the portable information storage medium by this invention, and the program of a portable information storage medium. (Example 2) It is a figure which shows the processing time table which the memory 14-2 has memorize | stored. (Modification) It is a flowchart which shows the operation | movement of the portable information storage medium by this invention, and the program of a portable information storage medium. (Modification)

Explanation of symbols

10 IC card 11 I / F
12 Timer interrupt part 13 CPU
14 Memory 20 External terminal 131 Processing unit 132 Interrupt processing unit

Claims (8)

In a portable information storage medium comprising command receiving means for receiving a command from an external terminal, and processing means for performing processing according to the command received by the command receiving means,
The processing time limit information indicates a process performed by the processing means in response to a command included in the time limit containing instruction when the command receiving means receives a time limit containing command including a command and processing time limit information. A processing time limit determining means for determining whether to end within the processing time limit ;
A prediction processing time storage unit that stores a prediction processing time that is a prediction of a time required for processing performed by the processing unit in response to an instruction;
The processing time limit judging means, when receiving a time limit containing command by the command receiving means, stored in the predicted processing time storage means, predicted processing time for processing of the instruction included in the time limit containing instruction, Making the determination based on the processing deadline indicated by the processing deadline information included in the deadline containing instruction ,
A portable information storage medium characterized by the above. The portable information storage medium according to claim 1 ,
When it is determined as NO by the processing time limit determining means, it is provided with an expiration date notifying means for notifying the external terminal to that effect,
A portable information storage medium characterized by the above. The portable information storage medium according to claim 2 ,
When the processing means determines NO by the processing time limit determination means, the processing means stops processing according to the command included in the time limit content instruction,
The expiration notification means notifies the external terminal that the processing has been stopped;
A portable information storage medium characterized by the above. The portable information storage medium according to any one of claims 1 to 3 ,
It said command receiving section has the same format as other instructions, receiving a previous SL-life limit containing instructions which instructions are stored in a nested condition the data unit,
The processing time limit determination means, the processing process performed by said processing means in response to instructions stored in the data portion of the deadline containing instructions received by said instruction receiving means, included in the prior SL-life limit containing instructions Determining whether to end within the processing time limit indicated by the time limit information;
A portable information storage medium characterized by the above. In a program for a portable information storage medium that causes a portable information storage medium to execute a command reception procedure for receiving a command from an external terminal and a processing procedure for performing processing according to the command received in the command reception procedure.
In the command receiving procedure, when a deadline containing command including a command and processing deadline information is received, the processing performed according to the command included in the deadline containing command in the processing procedure is indicated by the processing deadline information A processing deadline determination procedure for determining whether to end within the processing deadline ;
The portable information storage medium includes a predicted processing time storage unit that stores a predicted processing time that is a prediction of a time required for processing performed according to a command in the processing procedure,
The processing deadline determination procedure, when a deadline containing instruction is received in the instruction receiving procedure, is stored by the predicted processing time storage means, predicted processing time for processing of the instruction included in the deadline containing instruction, Making the determination based on the processing deadline indicated by the processing deadline information included in the deadline containing instruction ,
A portable information storage medium program characterized by the above. In the portable information storage medium program according to claim 5 ,
When it is determined to be no in the processing time limit determination procedure, it includes a time limit notification procedure for notifying the external terminal to that effect,
A portable information storage medium program characterized by the above. In the portable information storage medium program according to claim 6 ,
When the processing procedure determines NO in the processing deadline determination procedure, the processing procedure stops processing according to the command included in the deadline containing command,
The overdue notification procedure is to notify the external terminal that processing has been stopped,
A portable information storage medium program characterized by the above. In the program of the portable information storage medium according to any one of claims 5 to 7 ,
It said instruction receiving procedure has the same format as other instructions, receiving a previous SL-life limit containing instructions which instructions are stored in a nested condition the data unit,
The processing time limit determination procedure, the processing time limit process carried out in the procedure in accordance with the instructions stored in the data portion of the deadline containing command received in the command receive procedure is included prior SL-life limit containing instructions Determining whether to end within the processing deadline indicated by the information;
A portable information storage medium program characterized by the above.

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