JP3048550B2 - IC chip for IC card - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of exchanging data with a card reader / writer (external device) by half-duplex transmission, for example. It is activated by a control signal from the card reader / writer, and after activation, outputs initial response data indicating the start of activation to the card reader / writer, and then receives the instruction data from the card reader / writer to decode the instruction data In addition, the present invention relates to an IC card IC chip incorporated in an IC card that outputs a processing result as response data to a card reader / writer after executing processing for this. 2. Description of the Related Art Data is exchanged with a card reader / writer by half-duplex transmission, and a control program is started by a reset signal from the card reader / writer.
In addition, there is an IC card which receives and decodes instruction data from a card reader / writer, performs processing on the instruction data, and then outputs the processing result as response data to the card reader / writer. Such an IC card operates normally when the card reader / writer has a known transmission protocol. [0003] In general, the transmission protocol of an IC card differs depending on the model. For this reason, the IC card notifies the card reader / writer, which is an external device, of the transmission protocol and the like.
Outputs initial response data called Reset to the card reader / writer. Thereafter, the IC card enters a command data waiting state. In this case, the initial response data is composed of IC card transmission protocol specification information and information unique to the IC card, and is previously registered as a fixed parameter in a mask ROM or the like at the time of manufacturing the IC card IC chip. I have. However, in the conventional IC chip for an IC card, the initial response data is registered in a mask ROM or the like at the time of manufacture, so that the initial response data cannot be rewritten after the registration. For this reason, when the contents of the initial response data are updated or added after manufacturing, there is a problem that the IC chip for the IC card must be manufactured again. [0006] As described above, since the initial response data output after startup is fixedly registered in advance as fixed parameters, the content of the initial response data can be updated or added. There is a problem that can not be. Therefore, the present invention solves the above problems, and can arbitrarily register initial response data.
Accordingly, it is an object of the present invention to provide an IC card IC chip that can arbitrarily update or add the content of initial response data. According to the present invention, in order to solve the above-mentioned problems, the present invention is activated by a reset signal from an external device, and thereafter, receives an instruction from the external device. After receiving the data, it decodes the instruction data, executes the corresponding processing, and then outputs the processing result as response data to the external device.
Oite the IC chip card, a reset signal by the started when the IC card specific initial response data to inform the protocol to the external apparatus, and program in advance fixedly that are registered rewritable mask ROM
And a rewritable nonvolatile memory in which additional initial response data is registered, and a control element. The control element operates based on a program stored in the non-rewritable mask ROM. A registration function for registering initial response data in the rewritable nonvolatile memory based on a registration command and initial response data of initial response data transmitted from the external device, and a registration function activated by a reset signal from the external device. A determination function of determining whether or not the initial response data is registered in the rewritable nonvolatile memory; and determining that the initial response data is registered in the rewritable nonvolatile memory by the determination function. The first output function for outputting the initial response data registered in the rewritable nonvolatile memory; If it is determined by the function that the initial response data is not registered in the rewritable nonvolatile memory, a second output function of outputting the initial response data registered in the non-rewritable mask ROM is performed. The ROM, the non-volatile memory, and the control element are configured by one IC chip. In the present invention, the initial response data can be arbitrarily registered in the rewritable nonvolatile memory by an external application using the registration means. Therefore, even after manufacturing the IC card IC chip, the content of the initial response data can be arbitrarily updated or added. Embodiments of the present invention will be described below with reference to the drawings. FIG. 10 shows a configuration example of a card handling device to which the IC card according to the present invention is applied, for example, used as a terminal device in a home banking system or a shopping system. That is, this device allows the IC card 1 to be connected to a control unit 3 composed of a CPU or the like via a card reader / writer (external device) 2, and the control unit 3 has a keyboard 4 and a CRT display device 5. , A printer 6 and a floppy disk device 7 are connected. The IC card 1 is held by the user, and refers to a personal identification number known only to the user, for example, when purchasing a product, and stores necessary data. As shown, the read / write unit 11,
It comprises a part for executing basic functions such as a password setting / password collating unit 12, an encryption and decryption unit 13, and a supervisor 14 for managing these basic functions. The read / write unit 11 has a function of reading, writing, or erasing data with the card read / writer 2. The password setting / password collation unit 12 has a function of performing storage and reading prohibition processing of the password set by the user, collating the password after setting the password, and giving permission for the subsequent processing. The encryption / decryption unit 13 performs encryption or encryption for preventing communication data leakage and forgery when data is transmitted from the control unit 3 to another terminal device via a communication line, for example. This function performs data decryption, and performs data processing according to an encryption algorithm having a sufficient encryption strength, such as DES (Data Encryption Standard). The supervisor 14 is a function for decoding the function code input from the card reader / writer 2 or the function code to which data is added, and selecting and executing a necessary function among the basic functions. In order to exhibit these various functions, an IC
As shown in FIG. 8, for example, the card 1 has a control element (eg, CPU) 15, a non-volatile data memory (non-volatile memory) 16 whose storage contents are erasable (rewritable), and a non-erasable (non-rewritable) storage contents. And a contact portion 18 for obtaining electrical contact with the card reader / writer 2. Of these, a portion within a broken line, that is, a control element 15,
The data memory 16 and the program memory 17 are composed of one IC chip. The program memory 17 includes, for example, a mask R
A program area 171 for storing a control program of the control element 15 comprising a subroutine for realizing each of the basic functions as shown in FIG. 5, and initial response data indicating the start of activation of the IC card 1 as shown in FIG. And a parameter area 172 for storing The initial response data in the parameter area 172 is stored (registered) at the time of manufacturing the IC card 1, and includes, for example, transmission protocol specification information of the IC card 1, information unique to the IC card 1, and the like. The data memory 16 is composed of, for example, an EEPROM. As shown in FIG. 6, a plurality of data areas 161 used for storing various data and a parameter area 162 for storing (registering) initial response data are provided. It is composed of FIG. 7 shows a parameter area of the data memory 16.
162 data strings are shown. Here, a specific point
It is composed of data size, n-byte data and BCC code from AAAA. In this embodiment, the number of data that can be registered in the parameter area 162 is initial response data of a maximum of 32 bytes. Next, the operation in such a configuration will be described. First, the registration processing of the initial response data by the application will be described with reference to the flowchart shown in FIG. When receiving the initial response data registration command data from the card reader / writer 2, the control element 15 checks the size of the input data (initial response data) added to the received command data, thereby checking the input. It is determined whether the data (initial response data) can be stored in the parameter area 162 of the data memory 16. As a result of this determination, if the data can be stored, the control element
15 is a data memory for the above input data (initial response data)
The data is stored in the 16 parameter areas 162, a BBC is added for data assurance, and response data indicating completion of registration is output to the card reader / writer 2. If the data cannot be stored as a result of the above determination, the control element 15 outputs response data indicating that the data size is over to the card reader / writer 2. Next, the overall processing operation will be described with reference to the flowchart shown in FIG. When a reset signal, which is a start-up control signal from the card reader / writer 2, is set to the reset release state,
The control element 15 performs initialization, and then determines whether or not the initial response data is registered in the parameter area 162 of the data memory 16. As a result of this determination, if the initial response data is registered, the control element 15 checks the validity of the initial response data in the parameter area 162 of the data memory 16,
If normal, the initial response data in the parameter area 162 of the data memory 16 is output to the card reader / writer 2. If the result of the determination is that the initial response data has not been registered, or that the registered initial response data is abnormal, the control element 15 determines that the initial response data is in the parameter area 172 of the program memory 17. After outputting the initial response data, the control element 15 sets the card reader / writer 2
Waits for the instruction data from. At this time, when command data is input from the card reader / writer 2, the control element 15 executes a basic function according to the command data, and outputs response data indicating the processing result to the card reader / writer 2. Then, the process returns to the instruction data waiting state in the steady state. The instruction data output from the card reader / writer 2 to the IC card 1 has a format as shown in FIG. 3, for example, as shown in FIG. There is a form in which data is added to a function code as shown in FIG. FIG. 4 shows reading and writing of the initial response data of the program memory 17 and the initial response data of the data memory 16. FIG. 4A shows the present embodiment, in which the initial response data in the parameter area 162 of the data memory 16 is normal if the initial response data in the parameter area 162 of the data memory 16 is normal. Data is output as "read 2". If the registration by the application has not been completed or the registration has been completed, the initial response data in the parameter area 16 of the data memory 16 is output as "read 1". As described above, the initial response data output after the reset is released is selectively switched. FIGS. 4B and 4C show an application example of the present invention. However, it is considered that the transmission protocol specification information for notifying the card reader / writer 2 of the transmission protocol is unchanged, and the transmission protocol specification information in the parameter area 172 of the program memory 17 is used. First, FIG. 4B shows that the initial response data (not including the ancestral protocol specification information) by the application is registered in the data memory 162, and the output after reset release is checked by checking the registration state. If so, the transmission protocol specification information in the parameter area 172 of the program memory 17 and the initial response data in the parameter area 162 of the data memory 16 (not including the transmission protocol specification information)
And output as "readout 2". If not registered, the initial response data in the parameter area 172 of the program memory 17 is output as "read 1". Next, FIG. 4C shows the case where the application registers the initial response data (not including the transmission protocol specification information) when the application registers the initial response data and the program memory.
The transmission protocol specification information in the 17 parameter area 172 is combined and registered in the parameter area 162 of the data memory 16. Depending on the registration state, the output after reset release is output as "read 2" if registered, and is output as "read 1" if not registered. As described above, the area in which the initial response data can be registered is provided in the data memory, and the initial response data can be registered in this area by an external application. The initial response data to be output can be arbitrarily registered. Therefore, the content of the initial response data can be arbitrarily updated or added even after the IC card is manufactured. In the above-described embodiment, a case has been described where an area in which initial response data can be registered is provided in the data memory and the initial response data is registered in this area. A non-volatile memory for registration may be provided, and the initial response data may be registered in the non-volatile memory. As described above in detail, according to the present invention, the initial response data can be arbitrarily registered, so that the content of the initial response data can be arbitrarily updated or added. An IC chip can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a flowchart illustrating registration processing of initial response data by an application. FIG. 2 is a flowchart illustrating overall processing operation. FIG. 3 is instruction data output from a card reader / writer. FIG. 4 is a diagram for explaining reading and writing of initial response data of a program memory and initial response data of a data memory. FIG. 5 is a configuration diagram of a program memory. FIG. 6 is a configuration diagram of a data memory. 7 is a diagram showing the data structure of the parameter area of the data memory. FIG. 8 is a block diagram showing the structure of an IC chip incorporated in the IC card. FIG. 9 is a diagram showing functional blocks of the IC card. FIG. 3 is a block diagram illustrating a configuration. [Description of Signs] 1 IC card 2 Card reader / writer (external device) 15 Control element (CPU) 16 Data memory (non-volatile memory) 17 Program memory (mask ROM)

Claims (1)

(57) [Claims] It is activated by a reset signal from the external device, and thereafter, receives the instruction data from the external device, decodes the instruction data, executes a process corresponding thereto, and uses the processing result as response data as the response data. IC for IC card incorporated in IC card to output to
Oite the chip, a mask ROM initial response data, and a program for notifying the IC card specific protocol to the external device is not possible rewriting is previously fixedly registered when activated by the reset signal, additional early It consists of a rewritable non-volatile memory in which response data is registered, and a control element.
By operating based on the program stored in the mask ROM, the initial response data is stored in the rewritable nonvolatile memory based on the registration command and the initial response data of the initial response data transmitted from the external device. A registration function to register, and when activated by a reset signal from the external device,
A determination function for determining whether or not the initial response data is registered in the rewritable nonvolatile memory; and a case where the determination function determines that the initial response data is registered in the rewritable nonvolatile memory. A first output function for outputting the initial response data registered in the rewritable nonvolatile memory; and the determination function determines that the initial response data is not registered in the rewritable nonvolatile memory. In this case, a second output function of outputting the initial response data registered in the non-rewritable mask ROM is executed, and the ROM, the nonvolatile memory, and the control element are implemented by one IC chip. An IC chip for an IC card, comprising: