JPH05173892A - File loading system - Google Patents

Abstract

PURPOSE:To obtain a file loading system where the alternation of the load module file of an execution type and the illegal operation of a computer are prevented. CONSTITUTION:A first logical operation processing is executed in a file 20 which is obtained by ciphering the load module file 10 so as to generate a check digit, the check digit is added to a ciphering file 20 so as to form a ciphering file 30 with the check digit and it is inputted to the computer. The computer executes the second operation processing by the same rule as the first logical operation to the inputted file 30, compares the operation result with the check digit, refuses a loading when both does not coincide and decodes a ciphering file part so as to execute the loading when they coincide.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for loading an executable program storage file into an information processing device such as a computer (hereinafter referred to as a computer).

[0002]

2. Description of the Related Art Conventionally, when a program is loaded into a computer, a program developer creates an executable program load module file and loads the file as it is into the computer.

[0003]

However, in such a loading method, it is possible for a person other than the program developer to easily tamper with the program and load the tampered program to operate the computer illegally. There was a problem.

Further, there is a problem that the contents of the program are known to a third party by disassembling from the load module of the program.

An object of the present invention is to solve such a problem.

[0006]

In order to achieve the above object, the present invention provides a file loading method for loading a load module file of an executable format into an information processing device,
A first logical operation process is performed on the encrypted file of the load module file to generate a check digit, and this check digit is added to the encrypted file to form an encrypted file with a check digit. The encrypted file portion of the encrypted file with check digit is subjected to the second arithmetic processing according to the same rule as the first logical operation, and the arithmetic result is compared with the check digit. It refuses to load to the device, and when they match, the encrypted file part is decrypted and loaded to the information processing device.

[0007]

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

First, the procedure for forming the encrypted load module file will be described with reference to the flowchart of FIG.

The load module file 10 for which program debugging has been completed is encrypted together with the second keyword data KW2 (step 100) to create an encrypted load module file 20. Various encryption schemes have been devised, but this embodiment does not matter.

The encrypted load module file 20 performs a first logical operation process according to a certain rule by the first keyword data KW1 to generate a check digit (step 101), and encrypts this check digit. It is added to the module file 20 to form an encrypted load module file with check digit 30. As for the method of generating the check digit, the modulus 10,
Various methods such as the modulus 11 have been devised, but the present embodiment does not matter.

Next, the procedure for loading the encrypted load module file with check digit 30 thus formed into a computer (not shown) will be described with reference to the flowchart of FIG.

First, the first keyword data KW1 and the encrypted load module file with check digit 30 are subjected to the second logical operation processing according to the same rule as the logical operation processing (step 101) of FIG. 1 (step 102), The calculation result is compared with the check digit added to the encrypted load module file with check digit 30 (step 103).

As a result, if they do not match, an alarm is displayed and the process is terminated (step 106). If they match, the second keyword data KW2 and the encrypted load module file with check digit 30 are displayed in FIG. Decryption is performed according to the same rule as the encryption process (step 104), and the decrypted load module file is expanded in the memory of the computer (step 105).

The first keyword data shown in FIG.
KW1 and the first keyword data KW1 shown in FIG. 2 are exactly the same, and the second keyword data shown in FIG.
KW2 and the second keyword data KW2 shown in FIG. 2 are completely the same.

[0015]

As described above, according to the present invention, the load module file of the execution format is encrypted, and
The first logical operation process is performed on the encrypted load module file to generate the check digit, and this check digit is added to the encrypted file, so that the program contents cannot be decrypted by a third party. Become.

In the computer, the identity of the file contents is judged by the second logical operation processing of the input file, the encrypted file is decrypted only when the identity is confirmed, and the contents are expanded in the memory. Since this is done, there is an effect that it is possible to prevent the program contents from being falsified and the program from being illegally operated.

Further, the same keyword is set for each of the encryption and decryption, and the first logical operation process and the second logical operation process, and the encrypted file is decrypted only when these keywords match. Therefore, the above effect becomes more remarkable.

[Brief description of drawings]

FIG. 1 is a flowchart showing a procedure for forming an encrypted load module file for executing a file loading method according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a procedure for loading an encrypted load module file with check digit formed in this embodiment into a computer.

[Explanation of symbols]

10 Load module file 20 Encryption load module file 30 Encryption load module file with check digit KW1 1st keyword KW2 2nd keyword

Claims (2)

[Claims] 1. A file load method for loading an executable load module file into an information processing device, wherein a first logical operation process is applied to a file obtained by encrypting the load module file to generate a check digit, and this check digit is checked. A digit is added to the encrypted file to form an encrypted file with a check digit, and then a second arithmetic process according to the same rule as the first logical operation is performed on the encrypted file portion of the encrypted file with a check digit. The check result is compared with the check result, and if the two do not match, the loading to the information processing device is rejected.If they match, the encrypted file part is decrypted and the loading to the information processing device is performed. File loading method characterized by carrying out. 2. The same keyword is used for encryption of the load module file and decryption of the encrypted file portion, and for the first logical operation process and the second logical operation process, respectively. 2. The file loading method according to claim 1, wherein the file loading method is set so that the keyword can be loaded into the information processing apparatus only when the keywords match each other.