JPH05225407A - Data enciphering ic card system - Google Patents

Abstract

PURPOSE:To improve the security of data in an IC card system by providing the enciphering/decoding function of data to protect a content written on an IC card. CONSTITUTION:The storage of the data in the IC card 1 is performed by sending the data from a job computer 5 to an IC card reader/writer 3 when the IC card 1 is inserted to the IC card reader/writer 3, enciphering the data by an enciphering/decoding program 4. sending it to the IC card 1, and storing it in the memory of the IC card 1 by a file control program 2. When the data in the IC card 1 is extracted to the job computer 5, an enciphered data is extracted by the file control program 2, and it is sent from the IC card 1 to the IC card reader/writer 3, and it is decoded by the enciphering/decoding program 4, then, it is sent to and used in the job computer 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an IC card system, and more particularly to a data encryption IC card system having a function of encrypting / decrypting data handled by an IC card.

[0002]

2. Description of the Related Art A conventional IC card system includes an IC card having a relatively small capacity memory and a built-in CPU, a simple file management program installed in the memory (for example, a Zenginkyo IC card standard use), and an IC. It has an IC card reader / writer capable of giving input / output commands to the card.

In the conventional IC card system,
It has no function of encrypting data and decrypting encrypted data.

[0004]

The above-mentioned conventional IC card system has a problem in data security because it does not have the function of encrypting data and decrypting the encrypted data. Further, in order to implement the data encryption function, a relatively large memory needs to be built in in order to mount the encryption program in the memory of the IC card, which increases the manufacturing cost of the IC card. There is a problem that it cannot be inserted in the IC card.

An object of the present invention is to eliminate the above-mentioned drawbacks by incorporating an encryption function into an IC card reader / writer, and to provide an advanced security function at low cost without increasing the memory capacity of the IC card. It is to provide a data encryption IC card system that can be realized.

[0006]

Data encryption I of the present invention
The C card system includes a computer that processes data, an encryption function that encrypts the data processed by the computer and sends the encrypted data, and a decryption function that decrypts the encrypted data encrypted by the encryption function. And an IC card reader / writer having a memory and a function of storing encrypted data sent from the memory and the IC card reader / writer in the memory, taking out the encrypted data stored in the memory, and sending it to the IC card reader / writer. And an IC card having.

[0007]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 shows a data encryption I according to an embodiment of the present invention.
It is a block diagram of a C card system.

In FIG. 1, data encryption I of this embodiment is performed.
The C card system is composed of an IC card 1 having a file management program 2, an IC card reader / writer 3 having an encryption / decryption program 4, and a business computer.

First, when the business data is stored in the IC card 1, when the IC card 1 is inserted into the IC card reader / writer 3, the data processed by the business computer 5 is transferred from the business computer 5 to the IC card. leader/
It is sent to the writer 2 and encrypted by the encryption / analysis program 4. After that, it is sent to the IC card 1 and stored in the memory in the IC card 1 by the file management program 2.

On the contrary, when the data in the IC card 1 is taken out to the business computer 5, the encrypted data is taken out by the file management program 2 and sent from the IC card 1 to the IC card reader / writer 3 to be encrypted. After being decrypted by the encryption / decryption program 4, it is sent to the business computer 5 for use.

Next, the operation of the data encryption IC card system of this embodiment will be described with reference to the drawings.

FIG. 2 is a flow chart of operation processing of the data encryption IC card system of this embodiment, FIG. 2A is a flow chart of encryption of the data encryption IC card system of this embodiment, and FIG. It is a flow chart of the encryption of the data decryption IC card system of the present embodiment.

First, encryption will be described with reference to FIGS. 1 and 2A.

The IC card reader / writer 3 receives data from the business computer 5 (step 11), reads the IC card 1, and reads the group ID registered in advance (step 12). Group ID
Is collated with the list of group IDs registered in the memory of the IC card reader / writer 3 in advance, and if they match (step 13, Yes), the procedure of the next step 14 is performed. 13, N
o), the IC card is ejected (step 16). If they match (step 13, Yes), the data is encrypted using the encryption key registered in advance for each group ID (step 14), and the encrypted data is written to the IC card (step 15). ).

Next, regarding decryption, FIG. 1 and FIG. 2 (b)
Will be explained.

The IC card reader / writer 3 receives a data read request from the business computer 5 (step 2).
1), the IC card 1 is read, and the group ID registered in advance is read (step 22). Group I
D is collated with the list of group IDs registered in advance in the memory of the IC card reader / writer 3, and if they match (step 23, Yes), the next step 24
Procedure, and if they do not match (step 23, N
o), the IC card is ejected (step 27). If they match (Yes in step 23), the encrypted data is read from the IC card (step 2).
4) Decrypt the encrypted data using the encryption key registered in advance for each group ID (step 2
5) The data is transmitted to the business computer 5 (step 26).

[0018]

As described above, the data encryption IC card system of the present invention has a low cost without increasing the memory capacity of the IC card by incorporating the encryption function into the IC card reader / writer. Has the effect of realizing advanced security functions.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a data encryption IC card system according to an embodiment of the present invention.

FIG. 2 is a flowchart of an operation process of the data encryption IC card system of this embodiment. FIG. 2A is a flowchart of encryption of the data encryption IC card system of this embodiment. FIG. 2B is a flow chart of encryption of the data decryption IC card system of this embodiment.

[Explanation of symbols]

 1 IC card 2 File management program 3 IC card reader / writer 4 Encryption / decryption program 5 Business computer

Claims (1)

[Claims] 1. A computer for processing data, an encryption function for encrypting the data processed by the computer and transmitting the encrypted data, and a decryption for the encrypted data encrypted by the encryption function. IC card reader / writer having a decoding function, memory and the IC
An IC card having a function of storing encrypted data sent from a card reader / writer in the memory, taking out the encrypted data stored in the memory, and sending the encrypted data to the IC card reader / writer. Characteristic data encryption IC card system.