JPH0734214B2 - IC card - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to, for example, a card reader / writer (external device).
Data is exchanged by half-duplex transmission with and is activated by a control signal from the card reader / writer, and after activation, the initial response data indicating activation start is output to the card reader / writer, and then the card reader / writer. The present invention relates to an IC card that receives command data from a writer, decodes the command data, executes a process corresponding to the command data, and outputs the process result as response data to a card reader / writer.

(Prior art) Data is exchanged with a card reader / writer by half-duplex transmission, a control program is activated by a reset signal from the card reader / writer, and then command data from the card reader / writer is transmitted. Receive and decrypt,
An IC that executes the processing corresponding to this and outputs the processing result to the card reader / writer as response data.
I have a card. Such an IC card operates normally when its transmission protocol is known to the card reader / writer.

By the way, generally, the transmission protocol of the IC card differs depending on the model. Therefore, the IC card notifies the card reader / writer, which is an external device, of the transmission protocol and the like. Therefore, after recognizing the reset release by the reset signal, the initial response data called Answer to Reset is sent to the card reader / writer. Output to writer.
After that, the IC card waits for command data. In this case, the initial response data is composed of the transmission protocol specification information of the IC card and the information unique to the IC card, and is registered in advance in the mask ROM or the like as a fixed parameter when the IC card is manufactured.

However, in the conventional IC card, since the initial response data is registered in the mask ROM or the like at the time of manufacturing, it is impossible to rewrite the initial response data after the registration. Therefore, if the contents of the initial response data are updated or added after the manufacturing, there is a problem that the IC card must be manufactured again.

(Problems to be Solved by the Invention) As described above, since the initial response data output after startup is fixedly registered in advance as fixed parameters, the contents of the initial response data cannot be updated or added. There's a problem.

Therefore, the present invention is to solve the above problems, and an object of the present invention is to provide an IC card in which the initial response data can be arbitrarily registered and the contents of the initial response data can be updated or added arbitrarily. To do.

[Structure of the Invention] (Means for Solving Problems) The present invention is activated by a reset signal from an external device, and then receives the instruction data from the external device to decode the instruction data, and In the IC card that outputs the processing result as response data to the external device after executing the process corresponding to, when activated by the reset signal from the external device, informs the external device of the protocol unique to the IC card. Non-rewritable mask ROM in which initial response data is fixedly registered in advance, rewritable non-volatile memory in which additional initial response data is registered, registration command of initial response data from the external device, and Registration means for registering the received initial response data in the rewritable nonvolatile memory when the initial response data is received; When activated by a reset signal from the external device, a determination unit that determines whether or not the initial response data is registered in the rewritable nonvolatile memory, and this determination unit initializes the rewritable nonvolatile memory When it is determined that the response data is registered, the first output means for outputting the initial response data registered in the rewritable nonvolatile memory to the external device, and the rewriting by the determination means. Second output means for outputting the initial response data registered in the non-rewritable mask ROM to the external device when it is determined that the initial response data is not registered in the possible nonvolatile memory. It has and.

(Operation) The initial response data can be arbitrarily registered in the non-volatile memory rewritable by an application from the outside by using the registration means. Therefore, even after the IC card is manufactured, the content of the initial response data can be arbitrarily updated or added.

(Example) Hereinafter, one example of the present invention will be described 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 and which is used as a terminal device such as a home banking system or a shopping system. That is, this device uses the IC card 1 as a CP via the card reader / writer (external device) 2.
It is configured to be connectable to a control unit 3 composed of U and the like, and to which a keyboard 4, a CRT display device 5, a printer 6 and a floppy disk device 7 are connected to the control unit 3.

The IC card 1 is held by the user and refers to a personal identification number known only to the user, for example, when the user purchases a product, and stores necessary data. As shown in FIG. In addition, read / write section 11, password setting
The password collation unit 12 and the encryption / decryption unit 13 perform basic functions, and the supervisor 14 manages these basic functions. Read / write part 11
Reads data from / to the card reader / writer 2,
It is a function of writing or erasing. PIN code setting
The personal identification collation unit 12 has a function of performing storage and reading prohibition processing of the personal identification number set by the user, performing collation of the personal identification number after setting the personal identification number, and permitting subsequent processing. The encryption / decryption unit 13 is, for example, encrypted or encrypted data for preventing leakage or forgery of communication data when the data is transmitted from the control unit 3 to another terminal device via a communication line. To decrypt
For example, it is a function of performing data processing according to an encryption algorithm having sufficient encryption strength such as DES (Data Encryption Standard). The supervisor 14 is a function that decodes the function code or the function code added with data input from the card reader / writer 2, and selects and executes a necessary function from the basic functions.

In order to exert these various functions, the IC card 1 has a control element (for example, CPU) 15, as shown in FIG.
Non-volatile data memory (non-volatile memory) 16 whose stored contents can be erased (rewritable) 16 Program memory (mask ROM) whose stored contents cannot be erased (non-rewritable) 1
7 and a contact portion 18 for obtaining electrical contact with the card reader / writer 2, of which the portion within the broken line (control element 15, data memory 16,
The program memory 17) is composed of one IC chip.

The program memory 17 is composed of, for example, a mask ROM, and as shown in FIG. 5, a program area 171 for storing a control program of the control element 15 having a subroutine for realizing each of the basic functions and an IC card 1 Parameter area that stores the initial response data that means start-up
172 and. The initial response data in the parameter area 172 is stored (registered) when the IC card 1 is manufactured, and is composed of, for example, transmission protocol specification information of the IC card 1 and information unique to the IC card 1.

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 initial response data are stored (registered).
And a parameter area 162 to be displayed. FIG. 7 shows a data string in the parameter area 162 of the data memory 16. Here, it is composed of a data size from the specific point AAAA, n-byte data, and a BCC code. In the present embodiment, the parameter area 16
The maximum number of data that can be registered in 2 is 32 bytes of initial response data.

Next, the operation in such a configuration will be described. First,
Registration processing of initial response data by an 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 It is determined whether the response data) can be stored in the parameter area 162 of the data memory 16. As a result of this judgment, if the data can be stored, the control element 15 inputs the above-mentioned input data (initial response data)
Is stored in the parameter area 162 of the data memory 16, BBC is added for data guarantee, and response data indicating completion of registration is output to the card reader / writer 2. If it is determined that the data cannot be stored as a result of the above determination, the control element 15 outputs response data indicating that the data size has exceeded to the card reader / writer 2.

Next, the overall processing operation will be described with reference to the flowchart shown in FIG. When the reset signal, which is the control signal for activation from the card reader / writer 2, is set to the reset release state, the control element 15 initializes, and then whether the initial response data is registered in the parameter area 162 of the data memory 16 or not. To judge. As a result of this judgment,
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, and if normal, the initial response data in the parameter area 162 of the data memory 16 is checked. Output to the card reader / writer 2. Further, as a result of the above judgment, if the initial response data is not registered, or if it is registered but the initial response data is abnormal, the control element
Reference numeral 15 outputs the initial response data in the parameter area 172 of the program memory 17 to the card reader / writer 2. Now, after outputting the initial response data, the control element 15 is in a state of waiting for command data from the card reader / writer 2. At this time, when the command data is input from the card reader / writer 2, the control element 15 executes the basic function according to the command data, outputs response data indicating the processing result to the card reader / writer 2, and again. Return to the steady state waiting for command data.

The command 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 the function code as shown in b).

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, and when the application is registered and the initial response data in the parameter area 162 of the data memory 16 is normal, the initial response data in the parameter area 162 of the data memory 16 is " It is output as "readout 2". If the application has not registered, or if the registration has been completed but the initial response data in the parameter area 162 of the data memory 16 is abnormal, the parameter area 17 of the program memory 17
The initial response data in 2 is output like "Read 1". As described above, the initial response data output after the reset is released is selectively switched.

4 (b) and (c) are application examples of the present invention. However,
It is considered that the transmission protocol specification information that informs the card reader / writer 2 of the transmission protocol is unchanged,
This is a case where the transmission protocol specification information in the 17 parameter areas 172 is used. First, in FIG. 4B, the initial response data (not including the transmission protocol specification information) by the application is the parameter area 16 of the data memory 16.
The output after reset is checked by checking the registration status, and if registered, the transmission protocol specification information in the parameter area 172 of the program memory 17 and the initial response data (transmission in the parameter area 162 of the data memory 16 (Not including protocol specification information) and output as “readout 2”. If it is not registered, the initial response data in the parameter area 172 of the program memory 17 is output as in "read 1".

Next, FIG. 4 (c) shows that when the initial response data (not including the transmission protocol specification information) is registered by the application, the initial response data and the transmission protocol specification information in the parameter area 172 of the program memory 17 are combined. Then, it is registered in the parameter area 162 of the data memory 16. Depending on the registered state, the output after reset release is output as "read 2" if registered, and as "read 1" if not registered.

In this way, the area where 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 the application from the outside. Response data can be registered arbitrarily. Therefore, even after the IC card is manufactured,
The contents of the initial response data can be updated or added arbitrarily.

In the above embodiments, the case where the area for registering the initial response data is provided in the data memory and the initial response data is registered in this area has been described. However, for example, a nonvolatile memory for initial response data registration is provided separately from the data memory. Memory may be provided and the initial response data may be registered in the nonvolatile memory.

[Effects of the Invention] As described in detail above, according to the present invention, it is possible to provide an IC card in which the initial response data can be arbitrarily registered and the contents of the initial response data can be updated or added arbitrarily.

[Brief description of drawings]

FIG. 1 is a diagram for explaining an embodiment of the present invention. FIG. 1 is a flowchart for explaining initial response data registration processing by an application, FIG. 2 is a flowchart for explaining overall processing operation, and FIG. Is a diagram showing the format of command data output from the card reader / writer,
FIG. 4 is a diagram for explaining initial response data of the program memory and reading and writing of initial response data of the data memory, FIG. 5 is a configuration diagram of the program memory, FIG. 6 is a configuration diagram of the data memory, and FIG. FIG. 8 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 the IC chip incorporated in the IC card, FIG. 9 is a diagram showing the functional blocks of the IC card, and FIG. 10 is a card handling device. 3 is a block diagram showing the configuration of FIG. 1 ... IC card, 2 ... Card reader / writer (external device), 15 ... Control element (CPU), 16 ... Data memory (nonvolatile memory), 161 ... Data area, 162 ... Parameter area, 17: Program memory (mask RO
M), 171 …… Program area, 172 …… Parameter area.

Claims (1)

[Claims] 1. A device is activated by a reset signal from an external device, and thereafter receives command data from the external device to decode the command data, executes a process corresponding to the command data, and then returns the process result. In an IC card that outputs to the external device as data, when activated by a reset signal from the external device,
A non-rewritable mask ROM in which initial response data for informing the external device of the protocol unique to the IC card is fixedly registered in advance, and a rewritable nonvolatile memory in which additional initial response data is registered. When the initial response data registration command and the initial response data are received from the external device, a registration means for registering the received initial response data in the rewritable nonvolatile memory and a reset signal from the external device are activated. When
Judgment means for judging whether or not the initial response data is registered in the rewritable nonvolatile memory, and the case where the judgment means judges that the initial response data is registered in the rewritable nonvolatile memory. , First output means for outputting the initial response data registered in the rewritable nonvolatile memory to the external device, and the determination means for registering the initial response data in the rewritable nonvolatile memory. If it is determined that the IC card does not exist, the IC card is provided with a second output means for outputting the initial response data registered in the non-rewritable mask ROM to the external device. .