JP2681015B2 - Data security method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data security function.

[0002]

2. Description of the Related Art A conventional technique will be described with reference to the drawings.

5 (a) and 5 (b) are flow charts of a conventional technique.

First, as an encryption process, a record to be encrypted is received in step 500, the record is encrypted by a fixed encryption method in step 510, and the record is encrypted in step 52.
A record is stored with 0.

Next, as a decryption process, the record to be decrypted is received at step 530, and at step 540, the record is decrypted by a fixed decryption method similar to the encryption process.
The record is stored in step 550.

[0006]

In the above-mentioned conventional data security method, the encryption / decryption method used is fixed in each system, so that the data encrypted by a third party can be easily decrypted. However, there is a drawback that the confidentiality of data is low.

[0007]

[Means for Solving the Problems] The first invention is at the time of encryption.
Generates a random number and is prepared in advance according to the random number.
Before deciding one of multiple encryption methods
File name is encrypted by the encryption method.
Stored the file name at the beginning of the file and decided
Encrypt the record received by the above encryption method
Stored in the file, and at the beginning of the file when decoding
Receive the encrypted file name from and prepare in advance
File name encrypted by multiple decrypted methods
And the decoded file name is the actual file name.
Depending on the decryption method when it matches, the encrypted record
Decrypt the code and store the decrypted record in a file
It is characterized by that.

The second aspect of the invention is to use a random number at the time of encryption.
Is generated and a plurality of dark images prepared in advance according to the random number is generated.
Decide the order in the encoding method, and
Therefore, the file name is changed by the selected encryption method.
Encrypt in order, and use the encrypted file name
Stored at the beginning of the record, and when the record is received, the order is determined
One of the plurality of encrypted methods that have been
Therefore, according to the selected encryption method,
Encrypt the code and file the encrypted record
All files from the beginning of the file when decrypted.
Received the encrypted file name and received
All encrypted file names are prepared in advance.
File names that have been decrypted using multiple decryption methods
Depending on whether the actual file name matches
The execution order of the decryption methods is determined, and the encrypted record
When the command is received, the plurality of execution orders are determined.
Select one of the decoding methods according to the execution order
The encrypted version of the encryption method selected.
Decode the code and store the decrypted record in the file
It is characterized by doing.

[0009]

[0010]

[0011]

Next, the present invention will be described with reference to the drawings.

1A and 1B show data confidentiality protection.
3 is a flow chart showing an embodiment of an invention relating to a method .

First, as an encryption process, a record to be encrypted is received in step 100, and one of a plurality of encryption methods registered in a registration device (not shown ... Storage device, memory, etc.) is registered in step 110 in advance. The records are selected in a predetermined order, the record is encrypted according to the selected encryption method, and the encrypted record is stored in the file in step 120. It should be noted that when a plurality of encryption methods are selected to the end, they return to the beginning and cyclically select.

Next, as a decryption process, the record to be decrypted is received in step 130, and in step 140, one of a plurality of decryption processes registered in the registration device is selected in a predetermined order similarly to the encryption process. , Decrypts the record by the selected decryption process, and stores the decrypted record in a file in step 150.

2A and 2B show data confidentiality protection.
6 is a flowchart showing another embodiment of the invention relating to the method .

First, as the encryption process, the data to be encrypted is received in step 200, a random number is generated in step 210, and one of a plurality of encryption methods prepared in advance is determined according to the random number in step 220. The data is encrypted in step 230 by the determined encryption method, and a random number is added to the beginning of the data in step 240 and stored in a file.

Next, as a decryption process, the data to be decrypted is received in step 250, and in step 260, one is selected from a plurality of decryption methods prepared in advance according to the numerical value of the random number added to the beginning of the data, The data is decrypted by the decryption method selected in step 270. After that, only the data decrypted in step 280 is stored in the file.

3 (a) and 3 (b) relate to claim 1.
3 is a flowchart showing an embodiment of the first invention .

First, as an encryption process, a random number is generated in step 300, and the encryption method adopted in this data file is determined in accordance with the random number in step 310. In step 320, the data file name is encrypted by the determined encryption method, and in step 330, the encrypted data file name is stored at the beginning of the file. In step 340, the data is encrypted by the method of encrypting the data file name and stored in the file.

Next, as a decryption process, in order to identify which of a plurality of decryption methods is used for decryption, the encrypted data file name is received from the beginning of the file in step 350 and registered in step 360. Decode the file name using the decoding method in the order given. By repeating this until it matches the actual file name, the decoding method adopted in this data file is determined. Step 37
The data is decrypted by the decryption method determined by 0. Store the decrypted data in a file.

4 (a) and 4 (b) relate to claim 2.
6 is a flowchart showing an embodiment of the second invention .

First, as the encryption processing, the order of the encryption methods is determined according to a random number from the plurality of registered encryption methods in step 400. In step 410, the same data file name is encrypted by the encryption method according to the order, and in step 420, the encrypted data file name is stored from the beginning of the file. Repeat steps 410 and 420 as many times as there are encryption methods. The data is encrypted according to the order of the encryption method determined in step 430.

Next, as a decoding process, in step 440, the encrypted data file name is received from the beginning of the file, and in step 450 the file name is decoded by the registered decoding method. By repeating this until the actual file name is matched, the decoding method of this data is known, and by repeating steps 440 and 450, the order of the decoding method of the data is determined. The data is decoded according to the order of the decoding method determined in step 460.

[0024]

As described above, according to the present invention, it becomes difficult for a third party to decrypt the encrypted data by using a plurality of encryption methods and decryption methods, and the confidentiality of the data is enhanced. There is an effect that can be.

[Brief description of the drawings]

FIG. 1 is a process flow chart showing an embodiment of an invention relating to a data security method , (a) is a flow chart at the time of encryption, and (b) is a flow chart at the time of decryption.

FIG. 2 is a processing flow chart showing another embodiment of the invention relating to the data security method, wherein FIG.
(B) is a flowchart at the time of decoding.

FIG. 3 is a process flow chart showing an embodiment of the first invention , (a) is a flow chart at the time of encryption, and (b) is a flow chart at the time of decryption.

FIG. 4 is a processing flow chart showing an embodiment of the second invention , (a) is a flow chart at the time of encryption, and (b) is a flow chart at the time of decryption.

FIG. 5 is a process flow chart showing an embodiment of a conventional technique, (a) is a flow chart at the time of encryption, and (b) is a flow chart at the time of decryption.

[Explanation of symbols]

Step 100-Step 120 Data security method
Encryption process of invention related to law Step 130 to Step 150 Data security protection method
Decoding process of invention related to law Step 200 to Step 240 Data security method
Encryption process of another invention related to law Step 250 to Step 280 Data security protection method
Decoding process of another invention related to the law Step 300 to Step 340 Encryption process of the first invention Step 350 to Step 370 Decryption process of the first invention Step 400 to Step 430 Encryption process of the second invention Step 440 Step 460 Decryption process of the second invention Step 500 to step 520 Encryption process of prior art Step 530 to step 550 Decryption process of prior art

Claims (2)

(57) [Claims] 1. A random number is generated at the time of encryption, and the random number is generated.
One of the multiple encryption methods prepared in advance according to
And the file name according to the determined encryption method.
Is encrypted and the encrypted file name is
Stored in the head and received by the determined encryption method
When the record is encrypted, it is stored in the file and decrypted.
Is the encrypted file name from the beginning of the file
Received, and use the multiple decryption methods
Decrypt the encrypted file name, and
Depending on the decoding method when the file name matches the actual file name,
Decrypting the encrypted record and decrypting the record
Data security characterized by storing
Protection method. 2. A random number is generated at the time of encryption, and the random number is generated.
Order of multiple encryption methods prepared in advance according to
The selected order according to the determined order
The file name is sequentially encrypted by the encryption method, and
Store the encrypted file name at the beginning of the file and
When receiving the code, the plurality of ciphers whose order has been determined
Select one of the following methods in the order
Encrypt the record according to the encryption method
Store the encrypted record in a file, and at the time of decryption
All encrypted files from the beginning of the file
Received the full name and received all the encrypted files received.
About the file name, you can use multiple prepared decoding methods.
Decrypted and the decrypted file name matches the actual file name
Depending on whether or not to
Upon determining and receiving the encrypted record, the
1 in the plurality of decoding methods whose execution order is determined
One according to the execution order, and the selected decryption
Decrypt the encrypted record by
The data characterized by storing the record in a file
Security method.