JPH064407A - Device and method for storing data - Google Patents

Abstract

(57) [Summary] [Object] To provide a storage device and a storage method by which only a specific user can read out regular data. [Structure] Each divided portion of data is written in a corresponding memory cell in an array order in which a personal identification number input at the time of reading and a random number generated at that time are combined, and the personal identification number input at the time of reading and stored at the time of writing. By using a configuration in which random numbers are combined and read in the order of arrangement, meaningless data will be read when an incorrect PIN is input during reading, and data cannot be read if an incorrect PIN is entered. Compared with the above, since the illegal reading requires a great deal of labor for the decoding work and the reading work, the illegal reading is practically impossible and the confidentiality of the data can be surely maintained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data storage device and a data storage method, and more particularly to a data storage device and a data storage method for preventing unauthorized reading of data.

[0002]

2. Description of the Related Art Conventionally, in a storage device such as a semiconductor memory, a plurality of memory cell sets each including a plurality of memory cells are addressed, and data is assigned to each memory cell set word by word. Writing / reading is performed by allocating each bit of the word to each memory cell according to a certain rule.

[0003]

On the other hand, the data stored in the memory as described above may be read and used illegally. In recent years, it is important to prevent such fraudulent activity and maintain confidentiality. It was a problem. However,
In the conventional memory device, since each bit of the data always corresponds to the memory cell according to a certain rule as described above, for example, the wiring state is visually confirmed to specify the address and read it. Since the data can be easily read out only by performing the processing and the contents thereof can be known, it is difficult to prevent the fraudulent acts.

Therefore, a personal identification number input device and its collation device are provided in the data input / output device, and if the personal identification number input when writing the data and the personal identification number input when reading the data do not match the stored data. It is conceivable to make it unreadable.

However, in the case of a format in which the data cannot be read unless the personal identification numbers do not match, a device for inputting the personal identification number is created by trial and error by an unauthorized reader. By using it, the data can be read out within a certain time. Further, although it may be considered that the personal identification number is remarkably complicated, it is not practical because the user may not remember it.

The present invention has been made in view of the above-mentioned problems of the prior art, and its main purpose is to provide a storage device and a storage method by which only a specific user can read regular data. To provide.

[0007]

According to the present invention, the above object is to provide a data storage device which divides data in a predetermined unit and stores each divided portion in association with each memory cell. Means for generating a random number in response to the input of the personal identification number, a means for storing the generated random number, and a personal identification number input from the input means and a random number generating means for writing the data. Means for selecting a memory cell corresponding to each of the divided portions according to the random number, and at the time of data reading, according to the secret code input from the input means and the random number stored in the random number storage means, A data storage device, comprising means for writing / reading each divided portion to / from each memory cell according to a selection result of the selection means, and A data storage method of dividing a data into a predetermined unit and storing each divided portion in association with each memory cell, wherein a process of inputting a personal identification number when writing data and a random number accompanying the input of the personal identification number. , A step of storing the generated random number, and a memory cell corresponding to each divided portion is selected according to the secret code input from the input means and the random number generated by the random number generation means. Writing data, the process of inputting a personal identification number at the time of data reading, and selecting and reading the memory cell corresponding to each divided portion according to the input personal identification number and the stored random number. The present invention is achieved by providing a data storage method, which comprises:

[0008]

By doing so, meaningless data will be read unless the correct personal identification number is input.
At this time, if the division unit of the data is divided finely so that it cannot be understood at first glance, it is not possible to determine whether the data is correct at the time of reading, and an illegal reader does not make sense Will be replaced. In addition, even if an unauthorized reader uses a device that automatically generates a PIN code randomly and inputs it in order, a huge amount of meaningless data will be read and a device will be prepared to store all of these. There must be.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will now be described in detail with reference to the accompanying drawings. In this embodiment, it is assumed that the word length of the data to be stored is 4 bits.

FIG. 1 is a block diagram schematically showing the configuration of a data storage device to which the present invention is applied. Memory cell set 2 whose address is set in a memory area (not shown)
4 are four memory cells 2 each storing in a bit unit.
1 to 24, 31 to 34, 41 to 44, and these 4
One cell constitutes one word, and the memory cell 21
To 24 compose the i-th word, the memory cells 31 to 34 compose the j-th word, and the memory cells 41 to 44 compose the k-th word. These memory cells 21-24, 31-34, 41-
Selectors 5 to 8 are connected to 44. Data lines 9 to 12 connected to a data input / output device (not shown) are connected to each of the selectors 5 to 8. Further, the control signal input lines 13 to 16 are connected to the selectors 5 to 8 in addition to the data lines 9 to 12.
˜16 are connected to the selector control circuit 17. The selector control circuit 17 and the selectors 5 to 8 provide selection means for selecting in what order each bit of each word is stored in each memory cell 21 to 24, 31 to 34, 41 to 44. I am configuring.

The selector control circuit 17 is connected to a personal identification number input device 18 for inputting, for example, a four-digit personal identification number, and a random number generation circuit 19 for generating pseudo random numbers. A random number storage circuit 20 for storing the generated random numbers is connected to the random number generation circuit 19 and the selector control circuit 17.

When the personal identification number is input from the personal identification number input device 18, a pseudo random number is generated in the random number generation circuit 19, and this random number is stored in the random number storage circuit 20. Then, a data storage order corresponding to the simultaneously inputted personal identification number and the generated random number is generated, and the bit data from the data lines 9 to 12 are stored in the corresponding memory cells, respectively.

Next, the operation procedure of this embodiment will be described with reference to FIG. 2 by taking the writing order of the i-th word as an example.
First, when writing data, a personal identification number (for example, this is referred to as “CTRL”) is input from the personal identification number input device 18 before data is supplied from the data lines 9 to 12. At the same time, a random number (for example, "SE
L ". ) Is generated, stored in the random number storage circuit 20, and transmitted to the selector control circuit 17. Then, in the selector control circuit 17, a command for selecting a data line corresponding to the above-mentioned personal identification number and random number (for example, "SELCTR"
L ". ) Is generated and the selection command “SELCTRL” is transmitted to each of the selectors 5-8.

In FIG. 2, the value x from the data lines 9-12 is shown.
(0), the value x (1), the value x (2), and the value x (3) are input, and the selector 5 causes the data line 10 and the selector 6 causes the data line 1 in response to the data line selection command “SELCTRL”.
1, the selector 7 selects the data line 12, and the selector 8 selects the data line 9. Therefore, the memory cells 21 to 24 of the memory cell set 2 corresponding to the i-th word
Value x (1), value x (2), value x (3), value x (0)
Will be stored in this order.

Next, the reading order of the i-th word will be described with reference to FIGS. First, enter the PIN 18
From the random number storage circuit 20 is input to the selector control circuit 17.
Then, a selection command "SELCTRL '" of the data line corresponding to the personal identification number and the random number is generated, and each selector 5
Communicate this to ~ 8. Then, the selectors 5 to 8 output the data stored in the memory cells 21 to 24 to the corresponding data lines 9 to 12 according to the instruction.

The selector control circuit 17 is provided with a table corresponding to a personal identification number and a random number, and the data itself can be read even if an incorrect personal identification number is input.

Therefore, if the personal identification number input during reading matches the personal identification number input during writing,
Since the data line selection command "SELCTRL '" matches the data line selection command "SELCTRL" at the time of writing, the value x (0), value x (1),
The value x (2) and the value x (3) are output in this order to form correct data.

However, if the security code input at the time of reading is different from the security code input at the time of writing, the data line selection command "SELCTRL '" is different from the data line selection command "SELCTRL" at the time of writing. And, for example, as shown in FIG.
Is the data line 12, the selector 6 is the data line 9, the selector 7
Is the data line 10, and the selector 8 selects the data line 11, so that the data lines 9 to 12 have the value x (3) and the value x.
(0), the value x (1), and the value x (2) are output in this order, forming meaningless erroneous data.

Such an operation is performed for each word, and unless the personal identification numbers match, correct data cannot be obtained in word units. Also, since this read data is decomposed in bit units and combined, it is not possible to immediately judge whether the data is correct at the read point, and an unauthorized reader may Even if it is operated, erroneous data will be read out and its confidentiality will be secured.

The random number generation circuit 19 is adapted to change the random number to be used after data is written / read once, and even if the same secret code is input next time, the memory cells are in the same order. It is supposed to be remembered in. Therefore, a further confidentiality protection effect can be expected as compared with the case where only the ordinary personal identification number is input and the data is stored in the corresponding order.

[0021]

As is apparent from the above description, according to the storage device and the storage method of the present invention, data is stored in an array order in which the personal identification number input at the time of reading and the random number generated at that time are combined. By writing each divided part in the corresponding memory cell and reading it in the arrangement order that combines the secret code input at the time of reading and the random number stored at the time of writing, when an incorrect secret code is input at the time of reading This means that meaningless data will be read out, and if an incorrect PIN is entered, it will require a great deal of effort for the decryption and read-out work for an unauthorized reader, so it is practically impossible. Unauthorized reading becomes impossible,
It becomes possible to securely maintain the confidentiality of data.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a storage device to which the present invention is applied.

FIG. 2 is a block diagram showing an operating procedure of an embodiment according to the present invention.

FIG. 3 is a block diagram similar to FIG. 2, showing an operating procedure of an embodiment according to the present invention.

FIG. 4 is a block diagram similar to FIGS. 1 and 2, showing an operating procedure of an embodiment according to the present invention.

[Explanation of symbols]

 2-4 Memory cell set 5-8 Selector 9-12 Data line 13-16 Control signal input line 17 Selector control circuit 18 PIN code input device 19 Random number generation circuit 20 Random number storage circuit 21-24, 31-34, 41- 44 memory cells

Claims (3)

[Claims] 1. A data storage device for dividing data in a predetermined unit and storing each divided portion in association with each memory cell, wherein a means for inputting a personal identification number and a random number associated with the input of the personal identification number are provided. Means for generating the random number, means for storing the generated random number, in accordance with the secret code input from the input means at the time of data writing and the random number generated by the random number generating means,
And, at the time of reading data, a means for selecting a memory cell corresponding to each divided portion according to a secret code input from the input means and a random number stored in the random number storage means, and a selection result of the selection means. And a means for writing / reading each divided portion to / from each memory cell according to the above. 2. The data storage device according to claim 1, wherein the data is divided in bit units. 3. A data storage method of dividing data in a predetermined unit and storing each divided portion in association with each memory cell, wherein a process of inputting a personal identification number at the time of writing data, and a step of inputting the personal identification number. A step of generating a random number in response to the input, a step of storing the generated random number, and a memory corresponding to each divided portion according to the secret code input from the input means and the random number generated by the random number generating means. A step of selecting a cell and performing writing, and a step of inputting a personal identification number at the time of data reading, and a memory cell corresponding to each divided portion according to the input personal identification number and the stored random number. A data storage method comprising: selecting and reading.