JPH0793194A - Data update method and IC card - Google Patents

Abstract

(57) [Summary] [Object] To provide a data updating method for protecting update data such as advance payment data or billing data by alternately using the first storage area and the second storage area. [Structure] Input / output means 11, arithmetic means 13 for outputting one data from two data, two storage areas 15 and 16 for storing data, and one of these two storage areas are shown. Flag area 14 for storing the index
And a data management means 1 for controlling data by this index
2 and the data in the storage area indicated by the index stored in the flag area 14 and the data obtained from the input / output means 11 are sent to the arithmetic means 13, and the data is stored opposite to the storage area indicated by the index. The index is recorded in the flag area 14 only when it is recorded in the area and normally.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data update system and an IC card for protecting data that is constantly updated (hereinafter referred to as update data) such as advance payment data or billing data.

[0002]

2. Description of the Related Art When billing data is recorded on a recording medium such as a magnetic card, a plurality of storage areas are provided if the storage capacity is large and all update history is recorded. Update the billing data. Here, a data update method in the latter case where the storage capacity is limited will be described.

FIG. 4 is a block diagram of a conventional data updating method. Reference numeral 60 is an information storage medium such as a magnetic card, 51 is an input / output unit, 52 is a reading unit, 53 is a writing unit, 5
Reference numeral 4 is a calculation means, and 55 is one storage area in the recording medium 60. Reference numeral 50 is an information processing terminal configured to include at least 51 to 54 and capable of receiving the recording medium 60.

When the information processing terminal 50 reads the data in the storage area 55, the reading means 52 reads the data from the storage area 55 and delivers it to the input / output means 51.

When the information processing terminal 50 writes data in the storage area 55, the writing means 53 delivers the data obtained from the input / output means 51 and the data in the storage area 55 to the arithmetic means 54, and the result obtained from the arithmetic means 54 is obtained. Overwrite the storage area 55. When the data processed here is billing data, the calculation means 54 adds the data obtained from the input / output means 51 and the data in the storage area 55, and outputs the result.
Further, the calculation means 54 of a general prepaid system (hereinafter referred to as a prepaid system) subtracts the data obtained from the input / output means 51 from the data in the storage area 55 and outputs the result.

When all the above-mentioned update histories are recorded, a search process for the last updated data is necessary when reading and writing the data, but this data update method has a single storage area, so the search process is performed. Of course, it is simple in a storage medium having a limited storage capacity.

Further, recently, even if data is stored in a plurality of storage areas at the same time and a write error occurs in one of the storage areas, the data is still present in the other storage areas, and therefore the subsequent processing is performed. Are being considered for portable electronic devices.

[0008]

In the conventional data update method of recording update data in one storage area of a storage medium having a limited storage capacity, the storage medium is transferred from the information processing terminal while the data is being recorded. If the data is forcibly pulled out, the data recorded in the storage area is likely to be abnormal data. Further, even in the method of simultaneously storing data in a plurality of storage areas, there is a problem that extra processing time increases.

SUMMARY OF THE INVENTION In view of the above points, an object of the present invention is to provide a data updating system which can easily destroy data stored in a storage medium.

[0010]

In order to achieve the above object, the present invention provides an input / output means for inputting / outputting data, an arithmetic means for outputting one data from two data, and a data storing means. A first storage area and a second storage area;
The data management means comprises a flag area for storing an index indicating any one of the first storage area and the second storage area, and a data management means for controlling data according to the index of the flag area. Sends the data of the first storage area or the second storage area indicated by the index of the flag area and the data obtained from the input / output means to the arithmetic means, and the data obtained from the arithmetic means Only when the data is recorded in the first storage area or the second storage area opposite to the storage area indicated by the index of the flag area and normally recorded, The indicated index is recorded in the flag area. Further, the data management means is characterized in that the data of the first storage area or the second storage area indicated by the index of the flag area is taken out and sent to the input / output means.

[0011]

By alternately using the first storage area and the second storage area in this way, it is possible to protect update data such as advance payment data or billing data.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of the data updating method of the present invention. Reference numeral 11 is an input / output unit, 12 is a data management unit, 13 is a calculation unit, which is a component of an information processing terminal or the like (not shown). Further, 14 is a flag area, and 15
Storage areas A and 16 are recording areas B, which are secured in a rewritable nonvolatile memory of an IC card or a recording medium such as on a magnetic stripe of a magnetic card. Figure 2
FIG. 3 is a configuration diagram of a recording medium in an embodiment of the present invention.
Reference numeral 17 denotes a recording medium having a flag area 14, a storage area A15 and a recording area B16. In the present embodiment, the data stored in the storage area A15 is X, the data stored in the storage area B16 is Y, It is assumed that A is recorded as an index indicating the storage area A15 or B is recorded as an index indicating the storage area B16 in the flag area 14, and the index A is recorded first.

The input / output means 11 can send the input data to the data management means 12 and can output the data obtained from the data management means 12. When the system incorporating the data updating method of the present invention is a billing system, the computing means 13 adds the data obtained from the input / output means 11 and the data stored in the storage medium 17, and outputs the result. Also, in the case of prepaid system,
Input / output unit 1 based on the data stored in the storage medium 17
The data obtained from 1 is subtracted, and the result is output.

FIG. 3 is a flow chart of the processing of the data management means in one embodiment of the present invention, and the data updating method will be described with reference to FIG.

When the data management means 12 determines that the data is read from the storage medium 17 (step 31), the index stored in the flag area 14 of the storage medium 17 is read out and either the storage area A15 or the storage area B16 is read. It is determined whether to read from (step 33). When the index read here is A, the data is read from the storage area A15 and sent to the input / output unit 11 (step 36). When the index read here is B, the data is read from the storage area B16 and sent to the input / output means 11 (step 3).
7).

The data management means 12 uses the data (indicated here by the symbol Z) obtained from the input / output means 11 as the storage medium 1.
When it is determined that the data of 7 is updated and written (step 31), the index stored in the flag area 14 of the storage medium 17 is read and it is determined which data of the storage area A15 or the storage area B16 is updated. (Step 32). When the index read out here is A, the data X stored in the storage area A15 and the data Z obtained from the input / output means 11 are sent to the arithmetic means 13, and the arithmetic result of the arithmetic means 13 is set to Y, and the storage area B16. (Step 34). When the writing and updating are completed normally, the index B indicating the storage area B16 is recorded in the flag area 14 (step 38). Even if an error occurs during the writing and the data in the storage area B16 is destroyed, the data in the storage area A15, that is, the data before the update is not destroyed, so that the update processing or the read processing of the data can be continuously performed. . When the index read in step 32 is B, the data Y stored in the storage area B16
And the data Z obtained from the input / output unit 11 are sent to the calculation unit 13, and the calculation result of the calculation unit 13 is set as X, and the storage area A15
(Step 35). When the writing and the updating are completed normally, the index A indicating the storage area A15 is recorded in the flag area 14 (step 39). Even if an error occurs during the writing and the data in the storage area A15 is destroyed, the data in the storage area B16, that is, the data before the update is not destroyed, so that the update processing or the read processing of the data can be continuously performed. .

The recording medium 17 in this embodiment corresponds to the recording area 55 described in the prior art and includes a flag area and a recording area 2.
Although one storage area is required, the storage capacity is not limited as compared with the case where the data update history is stored. Further, according to the data updating method of the present invention, it becomes possible to protect the latest updated data even if an abnormality occurs while recording data in the storage area of the storage medium having a limited storage capacity.

[0018]

As described above, according to the present invention, by using the IC card having the data updating system of the present invention and the information processing terminal capable of accepting the IC card, the security is high, that is, the IC card. It is possible to easily construct a billing system or a prepaid system capable of protecting data even if the IC card is forcibly pulled out from the information processing terminal while data is being recorded in the storage area.

A billing system or a prepaid system constructed by using an IC card or a magnetic card having only the flag area 14, the storage area A15 and the storage area B16 and an information processing terminal capable of accepting these cards can be easily considered. To be

[Brief description of drawings]

FIG. 1 is a block diagram of a data updating method of the present invention.

FIG. 2 is a configuration diagram of a recording medium according to an embodiment of the present invention.

FIG. 3 is a flowchart of the processing of the data management means in the embodiment of the present invention.

FIG. 4 is a block diagram of a conventional data update method.

[Explanation of symbols]

 11 Input / Output Means 12 Data Management Means 13 Computing Means 14 Flag Areas 15 Storage Areas A 16 Storage Areas B

Claims (4)

[Claims] 1. An input / output means for inputting / outputting data, an arithmetic means for outputting one data from two data, a first storage area and a second storage area for storing the data,
The data management means comprises a flag area for storing an index indicating one of the first storage area and the second storage area, and a data management means for controlling data according to the index of the flag area. The data in the first storage area or the second storage area indicated by the index of the flag area and the data obtained from the input / output means are sent to the arithmetic means, and the data obtained from the arithmetic means is sent to the flag area. The index indicating the storage area in which the data obtained from the calculating means is recorded is recorded only when the data is recorded in the first or second storage area opposite to the storage area indicated by The data is recorded in a flag area, and the data management means extracts the data in the first or second storage area indicated by the index of the flag area and sends it to the input / output means. Data update method according to claim. 2. An I having the data updating method according to claim 1.
C card. 3. A recording medium having at least a flag area, a first storage area and a second storage area, and at least an input / output means, a computing means and a data management means capable of receiving the recording medium. A data update method composed of an information processing terminal included therein. 4. A data updating method in which the recording medium according to claim 3 is an IC card.