JPS61241889A - Portable medium - Google Patents

Abstract

PURPOSE:To avoid a case where the structure of an inside memory area is recognized easily from the outside and to improve the security, by giving access to apparently a single area from the outside in case an access is given to a single area within a data memory or giving accesses to plural areas. CONSTITUTION:A CPU 3 reads an area main number #01 corresponding to a code aA of the input data out of a specific area 4a as the input data and decides an access area as a data memory area 4b to confirm just a single area to receive an access for the input data. It is recognized as if the input data given access apparently to a single area when the data is supplied to the CPU 3 within an IC card 1. Thus the input data can be easily processed when an aces is given to a single area and also when the access is given to plural areas. Furthermore, it is not required to consider the structure of a data memory within the IC card at the side of an external device when access is given to the area. Thus it is impossible to recognize easily the structure of the inside memory area from the outside. This improves the security.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention is applicable to ICs such as CPUs and data memories.
The present invention relates to portable media such as IC cards with built-in chips.

[Technical background of the invention] Recently, IC cards have been developed and put into practical use as memory cards for writing data. This IC card includes a central processing unit (CPU), a master memory that stores control programs, a disk ROM, and a PROM.
Or data memory such as EEPROM.
It has a built-in C chip. The CPLJ is connected to a terminal on the surface of the card, and data is input and output from the outside through this terminal, and data is written to and read from the data memory under the control of the CPU.

[Problems with Background Art] However, in the above-mentioned IC card, information indicating a memory area to be accessed by input data is included in control information in the input data. Therefore, when a plurality of memory areas are to be accessed, data must be input to each area from outside the card while taking all of the memory areas into consideration. Such an access method is not only inefficient, but also allows the structure of the internal memory area to be recognized from outside the card, resulting in a lack of security for the IC card.

[Objective of the Invention 1 This invention was made in view of the above-mentioned circumstances, and its purpose is to improve the security of a mobile phone in which the structure of the internal memory area cannot be easily recognized from the outside. The goal is to provide a possible medium.

[Summary of the Invention] In order to achieve the above object, the present invention provides a device having a data memory and a control element, which is applicable to accessing a single area in the data memory or accessing multiple areas. However, from the outside it looks like 1
This makes it seem like one area is being accessed.

[Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

In FIG. 2, 1 is an IC card as a portable medium. A connecting portion 2 is provided on the surface of this IC card 1, and is composed of, for example, a plurality of terminals 2a, . . . , 2h. Terminal 2a is for operating power supply voltage (+5V), terminal 2b is for grounding, terminal 2C is for clock signal, terminal 2d is for reset signal, terminals 2e to 2g
is for data input/output, and terminal 2h is the power supply voltage for writing (+2
1■).

Also, inside the IC card 1, as shown in FIG.
unit) 3, control program, password (e.g. 4
digits), data, etc. are recorded therein, and are constituted by a data memory 4 constituted by EEPROM or FROM, an interface circuit 5, and a mask ROM 6 in which various control programs are recorded. Each of the above parts is composed of an IC chip and is provided on one substrate. Further, the interface circuit 5 and the connection section 2 are wired.

As shown in FIG. 3, the data memory 4 is composed of a specific area 4a, a data storage area 4b, and a sub-number storage area 4C.

The specific area 4a is an area access control information area in which a unique code (command) of input data and an area main number for selecting the storage areas 4b and 4C are stored in correspondence. For example, area main number "#O1J" is stored for command A, area main number @r#oOJ is stored for command B, and area main number r#oOJ is stored for command C.

Here, the area main number r#oOJ indicates the storage area 4C, and the area main number r#01J indicates the storage area 4b. The data storage area 4b is an area where data is stored, and for example, data is stored in each of the 208 areas with sub numbers [#30 to #FFJ]. Further, the sub number storage area 4G is an area where accessible sub numbers in the area 4b are stored, and for example, at least one sub number (area access control information) is stored.

Further, when command B and sub number r#02J are supplied as control information, the CPU 3 reads out the area main number r#oOJ from the specific area 4a of the data memory 4, and performs the processing corresponding to this area main number r#oOJ. The sub numbers [#30, #31J are read from the sub number r#02J area of the sub number storage area 4C, and the sub numbers "#30, #31J" in the read data storage area 4b are read.
”. moreover,
When the CPU 3 is supplied with the command A and the sub number r#2FJ as control information, the CPU 3 reads out the area main number r#01J from the specific area 4a of the data memory 4,
The sub number r#2FJ of the data storage area 4b corresponding to this area main number r#01J is accessed. Additionally, the CPU 3 reads out the area main number r#0oJ or r#oOJ to check whether the area to be accessed is single or multiple. In other words, if the area main number is r#oOJ, multiple areas are accessed. If the area main number is "#0σ", a single area becomes the target of access.

4 and 5 show the configuration of an IC card handling machine 10 as a terminal according to the present invention. That is, 11 is a CPU (central processing unit) that controls the whole, 12 is a keyboard for inputting data, 13 is a CRT display device, and 14 is a ROM (read only memory) in which control programs are stored. , 15 is a RAM (random) in which data is stored.
16 is a dot printer for outputting various print data; 17 is a floppy disk device for storing and reproducing data on a floppy disk 19 inserted from a floppy disk insertion slot 18; 20
There is an IC card reading predicate that reads data in the memory of the IC card 1 inserted from the card insertion slot 21 or writes data into the memory.

The IC card reading and sending section 20 is connected to the main body of the card handling machine 10 by a cable 22. That is, as shown in FIG. 6, a transport bus 31 for transporting the IC card 1 inserted through the card insertion slot 21 is provided. The transport bus 31 is equipped with a plurality of rotatable transport rollers 32, which are arranged in pairs to sandwich the IC card 1 from above and below when transporting it.

The pair of conveying rollers 32 are arranged at equal intervals along the conveying path 31.

The distance from the center of each of these transport rollers 32 to the center of the adjacent transport roller 32 has the width dimension in the card transport direction. Therefore, the transport path 31 of the IC card 1 is defined by the transport guide 33.

Further, the CP in the IC card 1 is placed on the transport guide 33.
A reader/writer 34 is arranged to exchange data with U3. This reading/jigging device 34 is electrically connected to the connecting portion 2 .

In addition, the CPIJ in the IC card 1 from the above CPIJ11
The input data supplied to No. 3 has a format as shown in FIG. That is, it is composed of a data-specific code (command code) a, an area sub number b1 to be accessed, and a data string C to be accessed. Control information is formed by the code a and the area sub number.

Next, in such a configuration, handling of an IC card will be explained with reference to flowchart 1 shown in FIG. For example, right now, the operator (handler) sets the IC card handling mode using the keyboard 12 of the C card handling 1110, and inserts the IC card into the card insertion slot 21.
Insert. Then, the IC card 1 is electrically connected to the reading station 34 by the connecting section 2.

Thereby, the CPU 11 supplies input data (command data) as shown in FIG. 6 and a signal indicating the handling machine to the CPU 3 via the reader/writer 34, the connector 2, and the interface circuit 5.

Then, the CPU 3 assigns the area main number (r#oOJ) corresponding to the code a(B) of the input data to the specific area 4.
5T1) and determines that the access area is the sub number storage area 4C (Sr1). Based on this determination, the CPU 3 confirms that there are multiple areas to be accessed by the input data. Next, the CPU 3 searches for a sub number in the sub number storage area 4C that matches the area sub number b (#02) of the input data 5T3).
If there is a matching sub number, read out the multiple sub numbers "#30, #31" stored in that area, and read out the sub numbers "#30, #31" in the data storage area 4b.
An access is made to (Sr1.5). At this time, if the corresponding sub number is not found (Sr1), C
PtJ3 outputs an area number mismatch signal to the CPU 11 (ST6).

Further, as input data, the CPU 3 reads the area main number r#01J corresponding to the code a (A) of the input data from the specific area 4a (ST1), and determines that the access area is the data storage area 4b (ST2).

Based on this determination, CPtJ3 determines that the input data has only one area to be accessed. Next, CPLJ3 is the area sub number b (#2
A sub number of the data storage area 4b matching F) is searched (5T7), and if a matching sub number is found, access is made to that area (ST8.9). At this time, if the corresponding sub number is not found (ST8)
, CPtJ3 outputs an area number mismatch signal to CPtJll (ST6).

When the CPU 11 is supplied with the area number mismatch signal, the CPU 11 displays this fact on the CRT display section 13 to notify the operator.

As mentioned above, whether you are accessing a single area or multiple areas, the IC
When data is input to the CPLJ 3 in the card 1, the data is recognized as if one area is being accessed.

Therefore, 51! of input data! Not only is this easier, but the security of the IC card is improved because the external device does not have to consider the structure of the data memory in the IC card when accessing it.

In addition, by changing or adding recognition information for area access, it is possible to easily handle any combination of areas required by the input data as the target of access, and maintain the security described above. .

[Effects of the Invention] As described in detail above, according to the present invention, it is possible to provide a portable medium in which the structure of the internal memory area cannot be easily recognized from the outside and the safety can be improved.

[Brief explanation of the drawing]

The drawings are for explaining one embodiment of the present invention, and FIG. 1 is a block diagram schematically showing the configuration of an electric circuit of an IC card, FIG. 2 is an external perspective view of the IC card, and FIG. FIG. 4 is an external perspective view of the card handling machine, and FIG. 5 is a schematic block diagram of the card handling machine. DESCRIPTION OF SYMBOLS 1... IC card (portable medium), 2... Connecting part, 28-2h... Terminal, 3... CPU (control element), 4... Data memory, 4a... Specific area , 4b...Data storage area, 4c...Sub number storage area, 5...Interface circuit, 6...
Mask ROM, 1' O-I C cart handling 111.1
l-CPU, 13... CRT display device, 2o
... r c card reading/writing section, 34...reading demand station. Applicant Agent Patent Attorney Takehiko Suzue No. 1 Figure 2 Figure 3 Figure 5 Figure 6 Figure 3 M Figure 7 Figure 8

Claims (2)

[Claims] (1) In a portable medium having a data memory and a control element, area designation data indicating whether input data supplied from the outside is access to a single area or multiple areas and address data in each area are provided. If the above area specification data indicates access to a single area, the area corresponding to the address data is accessed, and if the above area specification data indicates access to multiple areas, the address data is 1. A portable medium comprising means for accessing a plurality of areas stored in corresponding areas. (2) The portable medium according to claim 1, wherein the control element is a CPU.