JPS63292288A - Integrated circuit card - Google Patents

Abstract

PURPOSE:To keep the security of a job where data is read out with direct access given to a memory of an integrated circuit IC card, by enciphering the data on the memory. CONSTITUTION:An interface part 1 is provided to control the input/output of data between a host terminal equipment and an IC card together with a microprocessor 2, an enciphering part 3, and a data memory 4. The microprocessor 2 uses a memory area for secret data in the memory 4 to confirm the identity and carries out the reading/writing actions of data. In this case, the data is enciphered via the part 3 and written in the memory 4. When the data is read out, the enciphered data of the memory 4 is changed into the normal sentences through the part 3. These normal sentences are sent to the microprocessor 2. Thus the part 3 is used for reading writing of data to the memory 4. As a result, the security of data is ensured despite illegal access given directly to the memory 4.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an integrated circuit card (hereinafter referred to as an IC card).
regarding security measures.

〔overview〕

The present invention is a means for maintaining the confidentiality of information stored in an IC card, and by encrypting data on the memory, it is possible to maintain security against data reading performed by directly accessing the memory of the IC card. It has been made possible.

[Conventional technology]

In conventional IC cards, data is directly read and written to the memory after a security check such as identity verification is performed using a storage area for secret data on the memory.

[Problem that the invention seeks to solve]

In such conventional IC cards, security such as a password is taken into consideration when starting to use the card, but security is not taken into consideration when it comes to data.

Therefore, there is a drawback that if the memory area is read in an unauthorized manner, data may be misappropriated or stolen.

The present invention aims to eliminate these drawbacks and aims to provide an integrated circuit card in which the memory cannot be accessed directly and the data read cannot be used.

[Means for solving problems]

The present invention provides an integrated circuit card including a memory for storing data and a processor having means for writing and reading data to and from the memory, which is inserted into a path between the processor and the memory, and which is inserted into a path between the processor and the memory. The present invention is characterized in that it is equipped with an encryption means that encrypts data written to the memory and decrypts the data without reading it from the memory.

[Effect]

Encrypted data is stored in the memory.

When this data is read after going through a security check to confirm the identity of the person, the encrypted data can be used as plain text, but it is difficult to use encrypted data that has been directly read from memory without going through this procedure. It is. This makes it impossible to steal data by optically or electrically copying it as a complete pattern.

[Example] Hereinafter, an example of the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of this embodiment. FIG. 2 is a flow chart showing the operation of this embodiment.

This embodiment includes an interface section 1 for controlling the human output of data from a host terminal device and an IC cart, a microprocessor 2, an encryption section 3, and a data memory 4.

As shown in FIG. 2, the microprocessor 2 uses the storage area of the secret data in the data memory 4 to verify the identity of the person, and continues to read and write data. At this time, the data is encrypted using the encryption unit 3 and then written into the data memory 4. When reading data, the encrypting section 3 decrypts the encrypted data on the data memory 4 and passes it to the microprocessor 2.

〔Effect of the invention〕

As explained above, the present invention uses an encryption unit for reading and writing data to and from the data memory, so that data security can be maintained even if the memory is directly accessed by unauthorized persons.

[Brief explanation of drawings]

FIG. 1 is a block configuration diagram showing the configuration of an embodiment of the present invention. FIG. 2 is a flowchart showing the operation of the embodiment of the present invention. DESCRIPTION OF SYMBOLS 1...Interface part, 2...Microprocessor, 3...Encryption part, 4...Data memory.

Claims (1)

[Claims] (1) In an integrated circuit card comprising a memory for storing data and a processor having means for writing and reading data to and from the memory, the card is inserted into a path between the processor and the memory,
An integrated circuit card characterized by comprising an encryption means for encrypting data written in the memory and decrypting data read from the memory.