JPH01270191A - Memory card - Google Patents

Abstract

PURPOSE:To obtain a memory card capable of protecting data by providing an encoding/decoding circuit in the memory card. CONSTITUTION:Between a buffer circuit 2 for temporarily storing the data inputted and outputted between the memory IC 3 and a connector 1, and the memory IC 3, the encoding/decoding circuit 10 is provided to encode or decode the data at the time of reading or writing the data based on the control of a control circuit 4. Accordingly, the data or an address are respectively coded or decoded at the time of passing the encoding/decoding circuit 10. Thereby, the memory card provided with a function for protecting the data can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a memory card, and particularly to a memory card having a read/write protection function using key data.

[Prior Art] FIG. 2 is a block diagram of a conventional memory card, and FIG. 3 is an external view of the memory card shown in FIG. 2. In addition, the third
The sizes and shapes shown in the figures are those of general standards.

In FIG. 2, 1 is a connector provided on the end face of the card, 2 is a buffer circuit, and 3 is a memory IC 14 which is a control circuit.

In the memory card having the above configuration, a data bus signal 5, an address bus signal 6, and a control signal 7 are input and output through the connector l on the end face of the card.

The data bus signal 5 and address bus signal 6 are
The signal is applied to the memory IC 3 through the buffer circuit 2, and a data read or write operation to the memory is performed by the iti' control signal 7 of the control circuit 'tli4.

[Problems that need to be solved] The conventional memory cards mentioned above can be freely written to and written to the memory, so even if it is important or confidential data, it is easy to write or write to the memory. There was a problem with the light being created.

The present invention was made in view of the above-mentioned problems, and an object of the present invention is to provide a memory card having a function of protecting data.

[Means for solving problems] In order to achieve the above object, the memory card of the present invention has the following features:
a sheet-like housing having a connector; a memory IC that stores data that is input and output through the connector; a buffer that temporarily stores data that is input and output between the memory IC and the connector; The configuration includes an encryption/decryption circuit that encrypts and decrypts data input to and output from the memory IC, and a control circuit that controls the encryption/decryption circuit and the memory IC.

In other words, the function to perform data encryption and 1u encryption when reading memory data or loading old data is
ing.

[Example] Hereinafter, the present invention will be explained in detail based on the drawings.

FIG. 1 is a block diagram of a memory card according to an embodiment of the present invention. Note that parts common to or corresponding to those of the conventional example are denoted by the same reference numerals.

In the figure, IO is an encryption/decryption circuit, which is installed between the buffer circuit 2 and the memory IC 3.

In the above configuration, the encryption/decryption circuit IO encrypts or decrypts data when reading or writing data under the control of the control circuit 4.

Therefore, when data or addresses pass through this encryption/decryption circuit IO, they are respectively encrypted or decrypted. Therefore, the data is encrypted to the outside world. Note that this encryption or decryption is performed after the control circuit 40 controls according to the key data.

In this way, this example has a size of 85゜6mm x 54゜0m.
In a memory card that contains a predetermined memory IC and its peripheral circuits in a sheet-like housing of m x 3, 0 m + n, and has a connector for external connection on one end surface, it is used when reading memory data or writing XN. Occasionally encrypts or decrypts manually generated data8
1 ability.

It should be noted that the present invention is not limited to the above embodiments, but includes various modifications within the scope of the gist. For example, in the above-described embodiment, a sheet-like housing having a general standard size is used, but it goes without saying that the size and shape are not limited to this.

[Effects of the Invention] As explained above, the present invention provides a memory in which data is encrypted to the outside by providing an encryption/decryption circuit in the memory card, and the data can be protected from the outside. This has the effect of being able to provide cards.

[Brief explanation of the drawing]

FIG. 1 is a 70-piece diagram of a memory card according to an embodiment of the present invention. FIG. 2 is a block diagram of a conventional memory card, and FIG. 3 is an external view of the memory card shown in FIG. 1: Connector 2: Buffer 7 circuit 3: Memory IC,! l2 control circuit lO: encryption/decryption circuit

Claims (1)

[Claims] a sheet-like housing having a connector; a memory IC that stores data input and output through the connector; a buffer that temporarily stores data that is input and output between the memory IC and the connector; It is characterized by comprising an encryption/decryption circuit that encrypts and decrypts data input/output to the memory IC, and a control circuit that controls the encryption/decryption circuit and the memory IC. Memory card.