JPH08171621A - Ic card - Google Patents

Abstract

PURPOSE: To provide an IC card with which the supply of power and clocks from information processing terminal equipment can be executed again starting from the same conditions by holding managing information such as the selection information of files in the IC card while keeping the safety of the IC card even when that supply is stopped. CONSTITUTION: This IC card is provided with a saving means 15 to be activated by a backup instruction for copying the information recorded in a RAM 13 into a data saving area 19 of an EEPROM 14 and transmitting data prepared in a random number area 18 as a key to external equipment and a recovering means 16 to be activated only by a resume instruction accompanied with the data transmitted by the saving means 15 as the key for copying the information in the data saving area 19 of the EEPROM 14 copied by the saving means 15 into the RAM 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an IC card that can be attached to and detached from a terminal for communication while holding management information such as file selection information and password comparison results in the IC card.

[0002]

2. Description of the Related Art In an IC card, for example, when information is written in a rewritable nonvolatile memory of the IC card, I
An external device that communicates with the C card (hereinafter referred to as an information processing terminal device) first supplies power and a clock to the IC card in order to perform communication. After that, the file to be written is selected and the information is written. At this time, depending on the file, it is necessary to verify secret information such as a password before writing the information.

FIG. 4 is a diagram showing a structure of a file in the IC card. A process of writing information to a file in the IC card will be described with reference to this figure. 1 is I
C card master file, files 2 and 3 are file 1
The files 4 and 5 under the control of the file 3 are the files under the control of the file 3. Each file includes a directory section in which conditions for reading and writing information are recorded, and a data section in which actual information is recorded. Further, under the control of the file 1, the file 6 (for example, password data) in which the key data that must be collated to access the information of the file 1 is recorded
Exists similarly, file 7 exists in file 3, and file 8 exists in file 5.

Here, in the directory portion of the file 5,
Consider a case where it is necessary to collate the key data of the files 6, 7, and 8 in order to write information in the data section of the file 5.

At this time, the processing is performed for file 1 and file 3.
And the file 5 is selected and the key data of the file 6, the file 7 and the file 8 are collated, and the information can be written into the file 5 only after all the processes are normally completed.

In the conventional IC card, management information such as file selection information and key data collation results is recorded in the volatile memory of the IC card during communication with the information processing terminal device. That is, when the information processing terminal device stops the supply of power and clock to the IC card, the management information described above disappears. This is a necessary function from the viewpoint of security, because when the IC card is handed to a third party, reading and writing to the file cannot be done without selecting a predetermined file and collating the key data. It was

[0007]

SUMMARY OF THE INVENTION Such a conventional IC
In the card, for example, while the information processing terminal device is communicating with the IC card, the power supply and the clock supply to the IC card are temporarily stopped, and another process (for example, communication with the second IC card) is executed. Even when reading / writing the same file of the original IC card again, the information processing terminal device must execute the selection processing of a plurality of files and the collation processing of a plurality of key data again from the beginning on the IC card. However, the deeper the hierarchy of files, or the more key data to be verified, the more time and processing was required before the actual file was accessed.

In view of the above points, the present invention retains the conventional security and retains management information such as file selection information even when power supply and clock supply from the information processing terminal device are temporarily stopped and the same. It is an object to provide an IC card that can be re-executed under the conditions.

[0009]

In order to achieve the above object, the present invention provides a central processing unit, an input / output unit for communicating with an external device, and a non-rewritable first non-volatile memory. An IC card comprising a volatile memory used for operating the central processing unit and a rewritable second non-volatile memory, wherein the information recorded in the volatile memory is stored in the second card. When the data is copied to the non-volatile memory and the evacuation means for transmitting the key data for reading the information to the information processing terminal device and the key data for reading the information transmitted by the evacuation means are queried. Only the second copy made by the evacuation means
And a restoring means for copying the information in the non-volatile memory to the volatile memory.

[0010]

With this configuration, even if the power supply and the clock supply from the information processing terminal device are stopped, the management information such as the file selection information can be retained while maintaining the safety, and the file can be retained when the communication is performed again. It is possible to shorten the access time and the processing.

[0011]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the flow of information in an IC card in this embodiment. In the IC card 9, a central processing unit 10, a non-rewritable non-volatile memory 11 for storing a program describing the actual operation of the IC card 9, and an information processing having physical characteristics shown in the international standard ISO7816. Input / output unit 1 with terminal device
2. The volatile memory 13 used as a work for the central processing unit to operate (described as RAM in the drawing,
It is provided with a rewritable nonvolatile memory 14 (hereinafter referred to as RAM) (which will be referred to as an EEPROM in the drawings and hereinafter referred to as an EEPROM) for recording information. The saving means 15 and the restoring means 16 are a part of the program stored in the non-volatile memory 11. Evacuation flag 1
7, random number area 18 and data save area 19 are EEPROM
This is an area secured within 14, which will be described below together with the operation. Note that the EEPROM 14 has a plurality of other files and also has a readable / writable area.

First, a specific processing flow in the evacuation means 15 will be described with reference to FIG. IC card 9
Receives an instruction to activate the saving means 15 (hereinafter referred to as a backup instruction) from the information processing terminal device (not shown) through the input / output unit 12 (step 20), and the RAM.
The management information of 13 is stored in the data save area 1 of the EEPROM 14.
It is copied (saved) to 9 (step 21). After the copying process ends normally, 1 is set because the management information is saved in the save flag 17 (step 22), and a new random number is generated based on the random number recorded in the random number area 18. The random number area 18 is updated (step 23). Finally, as a response to the backup command, the management information accompanied by the new random number is sent as a response to the information processing terminal device through the input / output unit 12 (step 24).

Next, a specific processing flow in the restoring means 16 will be described with reference to FIG. When the IC card 9 receives an instruction to activate the restoring means 16 (hereinafter referred to as a resume instruction) from the information processing terminal device through the input / output unit 12 (step 25), the random number and the random number area received along with the resume instruction are received. The random number recorded in 18 is compared, and if they match, the process proceeds to the next step. here,
If the received random number and the random number recorded in the random number area 18 do not match, the information indicating that the process cannot be executed is transmitted to the information processing terminal device through the input / output unit 12 as a response to the resume command (step 26). Next, the save flag 17
Is set to 1, and if 1 is not set, information indicating that processing cannot be executed is transmitted as a response to the resume command through the input / output unit 12 (step 27). If the save flag 17 is set to 1, the information in the data save area 19 is copied (restored) to the RAM 13 (step 28). When the management information restoration process ends normally, the save flag 17 is initialized, for example, set to 0 (step 29). Finally, as a response to the resume command, information indicating that the restoration process has been normally completed is sent as a response to the information processing terminal device through the input / output unit 12 (step 30).

As described above, in the IC card of the embodiment of the present invention, the management information on the RAM such as the selection information of the file in the IC card and the collation result of the key data by the backup command is temporarily saved in the EEPROM by the backup command. EEP while ensuring safety with a resume command
The contents saved in the ROM can be restored in the RAM.

[0015]

As described above, according to the present invention, the information in the RAM can be temporarily saved in the EEPROM, which is a non-volatile memory. Since the clock supply can be stopped and the contents saved in the EEPROM can be restored to the RAM while maintaining safety, the information processing terminal device temporarily stops the power supply and the clock supply to the IC card. Then, after executing another process, you can communicate with the IC card again under the same conditions as when you saved
It is no longer necessary to perform processing such as selecting a plurality of files or collating a plurality of key data again. Therefore, it is possible to provide an IC card which has a quick response and is easy to use.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a flow of information in an IC card according to an embodiment of the present invention.

FIG. 2 is a flow chart of processing in the saving means according to the embodiment of the present invention.

FIG. 3 is a flow chart of processing in the returning means according to the embodiment of the present invention.

FIG. 4 is a file structure diagram of a general IC card.

[Explanation of symbols]

 9 IC card 10 Central processing unit 11 Non-volatile memory 12 Input / output unit 13 RAM 14 EEPROM 15 Saving means 16 Restoring means 17 Saving flag 18 Random number area 19 Data saving area

Claims (1)

[Claims] 1. A central processing unit, an input / output unit for communicating with an external device, a non-rewritable first non-volatile memory, and a volatile used for operating the central processing unit. An IC card including a memory and a rewritable second non-volatile memory, for copying the information recorded in the volatile memory to the second non-volatile memory and reading the information. In the second non-volatile memory copied by the evacuation means only when the evacuation means for transmitting the key data to the external device and the key data for reading the information transmitted by the evacuation means are inquired. An IC card, wherein the central processing unit executes restoration means for copying information to the volatile memory.