JP2000000369A - Game controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely prevent the alteration of a game program. SOLUTION: A game controller 1 as a device for controlling the operation of a game machine based on game program information Pr is provided with a memory 2 for storing the game program information Pr, a decoding means 3 having a specified decoding key and a decoding algorithm A for decoding information and a switching means 4 for switching write information SP to be sent to the decoding means 3 when the write information SP into the memory 2 is inputted from the outside, the decoding means 3 decodes the write information SP from the switching means 4 to generate decoded write information P, and the decoded write information P is outputted to the memory 2 and written.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a game control device provided in each game machine for controlling the operation of the game machine based on game program information.

[0002]

2. Description of the Related Art In recent years, gaming machines such as pachinko machines have been widely computerized and controlled by computers, and the contents of the games have been diversified by incorporating "big hits". Interest in games is also increasing. The game content is in accordance with a game program stored in a ROM, which is a nonvolatile memory.

By the way, in the computer-controlled gaming machine, the game content can be changed by replacing the ROM and replacing the game program. Therefore, the game program is replaced and falsified so that the game content is advantageous to the player. New cheating has begun. And
Once the game program has been tampered with, the damage to the amusement store, such as the abnormal occurrence of "big hits", is far greater than in the past. In addition, due to such misconduct, the soundness of the game is impaired, and the trust of the player is lost.

Therefore, in order to solve such a problem,
For example, some ROMs are formed integrally with the substrate, making it impossible to replace the ROM itself.
The game program can be tampered with by writing to M, and the tampering of the game program is still occurring.

[0005] In order to prevent such a falsified game program from being written, for example, the following game program verification is performed. That is,
A result obtained by performing a calculation process with a predetermined function on a regular game program is stored in advance in a memory as authentication data, and every time the game machine is started up, a calculation process using the same function is performed on a game program in a ROM, It is determined whether or not the calculation result matches the authentication data stored in advance, and if they do not match, it is determined that the game program has been tampered with and a predetermined fraud handling process is performed.

[0006]

However, in the above-described conventional game program verification method, authentication data having a large data amount irrelevant to the operation of the device is added to the memory, so that the use range of the memory is narrowed. Not only
Since the authentication data itself is meaningless data, it becomes a hindrance to inspections such as debugging and disassembling.

Further, since the tampering of the game program itself is not prevented, the tampered game program is operated until the next verification after the tampering of the game program. This resulted in a great loss.

In addition, since the verification is performed every time the gaming machine is started up, it takes a long time to start up the game machine, and the starting up is complicated.

Further, since the time required for each verification of the game program also increases in proportion to the data length, the device start-up time becomes variable depending on the data length, which hinders control of the entire device.

[0010] The present invention has been proposed in view of the above,
It is an object of the present invention to provide a game control device which does not need to write a large amount of authentication data in a memory, does not perform a game program verification at the time of startup, and can reliably prevent a game program from being tampered with. .

[0011]

According to an aspect of the present invention, there is provided a game control device provided in each game machine for controlling the operation of the game machine based on game program information. A memory for storing the game program information, a decryption means having a predetermined decryption key and a decryption algorithm for decrypting information, and, when write information to the memory is externally input, the write information Switching means for switching to send to the decoding means, wherein the decoding means decodes the write information from the switching means to generate decoded write information,
The decrypted write information is output to a memory and written.

According to a third aspect of the present invention, in addition to the configuration of the first aspect of the present invention, the self-inspection information and the self-inspection reference information stored in advance in a non-rewritable manner. Output the information to the decoding means, receive the decoded self-inspection information decoded by the decoding means, compare the decoded self-inspection information with self-inspection reference information, and determine whether or not both match. Verification means.

According to a fifth aspect of the present invention, in a game control device provided in each game machine for controlling the operation of the game machine based on the game program information, a memory for storing the game program information, Decryption means for decrypting information having a decryption key and a decryption algorithm of
Switching means for switching the write information to be sent to the decryption means when the write information to the memory is externally input, wherein the decryption means converts the input encrypted authentication key to the decryption algorithm. To generate a decryption authentication key, generate a composite decryption key using the decryption authentication key and the predetermined decryption key, and use the decryption algorithm with the composite decryption key obtained in the composite key generation procedure. Thus, the input write information is decoded, and the decoded write information obtained by the decoding is output to a memory and written.

According to a sixth aspect of the present invention, in addition to the configuration of the fifth aspect of the present invention, the encrypted authentication key, the self-inspection information, and the self-inspection reference information stored in a non-rewritable manner in advance. Outputting the encrypted authentication key and the self-inspection information to the decryption means, and using the composite decryption key obtained in the composite key generation procedure on the basis of the encrypted authentication key in the decryption means. Self-verification means for receiving the decrypted self-inspection information from the decoding means, comparing the decrypted self-inspection information with self-inspection reference information, and determining whether or not both coincide with each other. I have.

[0015]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a principle block diagram of a game control device of the present invention. In the figure, a game control device 1 of the present invention is a device provided in each game machine for controlling the operation of the game machine based on the game program information Pr, and a memory 2 for storing the game program information Pr.
A decryption means 3 having a predetermined decryption key K and a decryption algorithm A for decrypting information; and, when write information SP to the memory 2 is inputted from outside, the write information SP is transmitted to the decryption means 3. And switching means 4 for switching to send the data. The decoding means 3 decodes the write information SP from the switching means 4 to generate decoded write information P, and outputs the decoded write information P to the memory 2. It is characterized by writing.

In this case, if the game program information Pr has been written in the memory 2 in advance, the decrypted write information P is overwritten on the game program information Pr. If nothing has been written to the memory 2, the decryption write information P is newly written. Thereafter, the game control device 1 treats the decrypted write information P as game program information, and controls the operation of the gaming machine based on the decrypted write information P.

As described above, in this embodiment, when the write information SP to the memory 2 is externally input,
The write information SP is always sent to the decoding means 3, and the decoded write information P decoded by the decoding means 3 is written to the memory 2.

Here, the write information SP will be described. As described above, obtaining the decrypted write information P by decrypting the write information SP means that the write information SP is obtained by encrypting the decrypted write information P. . Then, as shown in the figure, the write information SP for obtaining the desired decrypted write information P as the game program information is, as shown in FIG. It can be obtained by encrypting at 6.
The encryption in the encryption means 6 must be performed on the original information P using the encryption algorithm A with the encryption key K.

In this case, the encryption key K and the decryption key K
Are the same key K, and differ only in whether they are used for encryption or decryption. Similarly, the encryption algorithm A and the decryption algorithm A are the same algorithm A, and differ only in whether the algorithm is used for encryption or decryption.

In order to encrypt the original information P in the encryption means 6, it is necessary to know the decryption key K of the decryption means 3 and the algorithm A in advance, but the decryption key K is managed as a private key. The third party cannot know the decryption key K as long as it is. Therefore, even if a third party creates write information from the original information P in such a situation and inputs the write information from the outside, the decrypted write information obtained as a result of the decryption processing matches the original information P. Without this, it becomes meaningless information that does not hold as a program. Even if such decryption / writing information is written in the memory 2, the game control device 1 does not function properly, causing the game machine to run out of control, and cannot be used thereafter. That is, illegal rewriting of the game program information can be prevented.

Thus, as long as the decryption key K embedded in the game control device 1 is not disclosed to a third party, even if the third party creates and inputs the write information SP, use of the write information SP is prevented. In addition, tampering of the game program information stored in the memory 2 can be reliably prevented.

Further, even if the illegally encrypted game program information is externally input and rewritten, the game machine does not operate normally and runs away, so that the illegality can be immediately detected and the illegal game program can be detected. Since the game is not established in the program, there is no loss at the game store.

Further, since only the game program information is written in the memory and the information necessary for authentication is not written,
It is possible to make the best use of the memory.

In the above description, the decrypted write information P is written to the memory 2 as it is. However, before the decrypted write information P is written to the memory 2, the decrypted write information P is compared with regular game program information, and only when there is a match. You may write it. In this case, the regular game program information is stored in an external storage device in advance, for example. In this way, by confirming the match before writing to the memory 2, it is possible to reliably prevent unauthorized game program information from being written.

The game control device 1 includes the following self-verifying means 5 and authenticates the decryption key K and the decryption algorithm A stored in the decryption means 3 by itself. That is, the self-verifying means 5 outputs the self-test information SI to the decoding means 3 among the self-test information SI and the self-test reference information I0 stored in advance in a non-rewritable manner.

The self-inspection information SI is information generated by encrypting the self-inspection reference information I0 with the encryption key K using the encryption algorithm A. Accordingly, if the self-test information SI is decrypted using the decryption algorithm A with the decryption key K, the information coincides with the self-test reference information I0.

The self-verifying means 5 receives the decoded self-check information I decoded by the decoding means 3 from the decoding means 3 and converts the decoded self-check information I into the self-check reference information I.
It is compared with 0 to determine whether or not both match. As described above, the decryption self-check information I and the self-check reference information I0 originally match, but if they do not match, the decryption key K or the decryption algorithm A may be tampered with. In such a case, an unauthorized countermeasure process such as stopping the operation of the gaming machine is performed.

Even if a third party falsifies the decryption by the decryption means 3 by falsifying the decryption key K or the decryption algorithm A of the decryption means 3 and rewrites the game program information, in this embodiment, Since self-verification is performed, tampering in the decryption means 3 can be reliably detected.

If the authentication of the decryption key K and the like by this self-verification is performed, rewriting of the game program information in the memory 2 can be completely prevented without fail.
Normally, the security of the game control device 1 can be sufficiently maintained only by performing the self-verification.

In addition, since the self-verification is only performed by decoding the self-inspection information and comparing it, the amount of data to be processed is small, and the self-verification can be completed in a short period of time. The game machine can be smoothly shifted to the normal operation.

FIG. 2 is a block diagram showing the principle of the second embodiment of the present invention. In the figure, a game control device 10 of the present invention is a device provided in each game machine to control the operation of the game machine based on the game program information Pr, and a memory 20 for storing the game program information Pr;
A decryption unit 30 having a predetermined decryption key K2 and a decryption algorithm A for decrypting information, and a configuration in which when the write information SP to the memory 20 is externally input, the write information SP is transmitted to the decryption unit 30. The decryption means 30 decrypts the input encrypted authentication key SK1 in accordance with the decryption algorithm A to generate a decrypted authentication key K1, and then, decrypts the decrypted authentication key K1 A decryption key K3 is generated using the decryption key K2, and the input write information SP is decrypted using the decryption algorithm A using the composite decryption key K3 obtained in the composite key generation procedure. The decrypted write information P is output to the memory 20 and written therein.

In this case, similar to the first embodiment,
If the game program information Pr has been written in the memory 20 in advance, the decrypted write information P is overwritten on the game program information Pr. If nothing has been written in the memory 20, the decryption write information P is newly written. After that, the game control device 10 treats the decoded writing information P as game program information, and controls the operation of the gaming machine based on the decoded writing information P.

Further, as in the case of the first embodiment, in this embodiment, the write information S
When P is input from outside, the write information SP
Is always sent to the decryption means 30, and the decrypted write information P decrypted by the decryption means 30 is written to the memory 20.

Here, the encryption authentication key SK1 and the write information SP will be described. As shown in the figure, the encrypted authentication key SK1
Is encrypted by using the encryption algorithm A, while the write information SP is transmitted from the encryption unit 62 to the composite encryption key K3 using the authentication key K1 and the encryption key K2.
Is generated by encrypting the original information P as the desired decryption write information P using the encryption algorithm A with the synthetic encryption key K3.

In this case, the authentication key K1 and the decryption authentication key K1 are the same key K1, and the only difference is whether the key is used for encryption or decryption. Similarly, the encryption key K2 and the decryption key K2 are the same key K2, and differ only in that they are used for encryption or decryption. Further, as in the case of the first embodiment, the encryption algorithm A and the decryption algorithm A are the same algorithm A, and differ only in whether they are used for encryption or decryption.

As described above, the decryption means 30 in the second embodiment combines the decryption authentication key K1 generated by decrypting the externally encrypted encryption key SK1 with the decryption key K2 possessed in advance. A decryption key K3 is generated, and the decryption of the write information SP is performed using the composite decryption key K3. That is, the encryption processing at the stage of creating the write information SP includes the decryption authentication key K1 and the decryption key K2 in advance.
Therefore, the possibility that a third party can perform the encryption process in advance is further reduced, and the falsification of the game program information stored in the memory 20 is more reliably prevented. Becomes

As in the first embodiment, the game control device 10 includes the following self-verification means 50, and authenticates the decryption key K2 and the decryption algorithm A stored in the decryption means 30. Going on your own. That is, the self-verification unit 50 is configured to use the encrypted authentication key SK1 of the encrypted authentication key SK1, the self-inspection information SI, and the self-inspection reference information I0 stored in advance in a non-rewritable manner.
The self-inspection information SI is output to the decoding means 30, and the decoded self-inspection information I decoded by the decoding means 30 is compared with the self-inspection reference information I0.

The self-inspection information SI is the self-inspection reference information I
0, an encryption algorithm A using a synthetic encryption key K3 generated by synthesizing the authentication key K1 and the encryption key K2.
This is information generated by performing an encryption process using.
Therefore, the self-inspection information SI is inversely converted to the composite decryption key K3.
, The information matches the self-inspection reference information I0.

The decryption means 30 generates a composite decryption key K3 based on the encrypted authentication key SK1 from the self-verification means 50 by the above-described composite key generation procedure, and generates the composite decryption key K3.
Is used to decode the self-inspection information SI and output the decoded self-inspection information SI to the self-verification unit 50. Then, the self-verifying means 50 determines whether or not the transmitted decrypted self-check information I matches the self-check reference information I0 stored in advance. As in the case of the first embodiment, the decryption self-check information I and the self-check reference information I0
, But if they do not match, it is determined that the decryption key K2 or the decryption algorithm A in the decryption means 30 has been tampered with and the subsequent operation of the gaming machine is stopped. And perform an unauthorized response process.

As described above, the self-verification means 50 transmits the encrypted authentication key SK1 in addition to the self-check information SI to the decryption means 30.
The self-verification corresponding to the configuration of the decryption unit 30 that decrypts information using the decryption algorithm A with the combined decryption key K3 can be performed, and tampering in the decryption unit 30 can be reliably detected. can do. Therefore, the security of the decryption means 30 can be reliably ensured, and it is possible to completely prevent an illegal act on the game control device 1.

Next, a specific configuration example in the second embodiment will be described with reference to FIG. In the following description, a gaming machine maker receives a master file from a certification / authorization organization, and stores the master file in a ROM of a game control device.
Will be described.

FIG. 3 is a diagram showing a configuration example of a game control device of the present invention. In the figure, a game control device 100 is configured as a system LSI that controls the operation of a game machine,
CPU 101, R / W (read / write) selection circuit 10
6, a ROM 102, a mask ROM 109, a switching circuit 104, a decoding circuit 103, and a self-verification circuit 105, which are commonly connected to a bus 110 for addresses and data. Further, a ROM writer 107 having a master file 108 is disposed outside the game control device 100.
It is connected to the bus 110 via the / W selection circuit 106.

The master file 108 is a storage medium such as a floppy disk, an IC memory card, or a PROM.
The master file 108 includes the regular game program information P0 authenticated by the certification authority, an authentication key K1 issued to the game machine maker by the certification authority, an encrypted authentication key SK1 obtained by encrypting the authentication key K1, and a game. Control device 1
The write information SP to be written in the ROM 102 is stored in advance.

The game program information P0 includes the game program itself and various data required in connection with the game program. Also, the encryption authentication key SK1 is
The authentication key K1 is encrypted according to an algorithm A of data encryption (decryption) such as DES (data encryption standard). The write information SP is composed of a combined encryption key K3 formed by combining an authentication key K1 corresponding to the key body and an encryption key K2 corresponding to the key groove shape.
Thus, the regular game program information P0 is obtained by encrypting using the algorithm A.

In the decryption circuit 103, the above algorithm A and the encryption key K2 are stored beforehand in a non-rewritable and inaccessible state. In the decryption circuit 103, the authentication key K1 is used as the decryption authentication key K1.
And the encryption key K2 is a decryption key K2 and a synthetic encryption key K3
Is used in other words as the combined decryption key K3, and the algorithm A is used as the decryption algorithm A.

In the self-verification circuit 105, the self-inspection information SI, the encrypted authentication key SK1, and the self-reference information I0 are stored in advance in a non-rewritable manner.

Further, a self-verification program PD is stored in the mask ROM 109 in advance so that it cannot be rewritten.

In the game control device 100 having the above configuration,
Writing of the game program information to the ROM 102 is performed as follows. First, the master file 108 is stored in ROM
The ROM writer 107 is connected to the writer 107 and turns on the ROM mode and the write mode W.
At this time, the ROM 102 enters a writable state based on a signal from the R / W selection circuit 106. The encrypted authentication key SK1 and the write information SP of the master file 108 are sent to the switching circuit 104, and further sent to the decryption circuit 103 by the operation of the switching circuit 104.

The decryption circuit 103 decrypts the input encrypted authentication key SK1 in accordance with the decryption algorithm A to generate a decrypted authentication key K1, and subsequently the decrypted authentication key K1
1 and a decryption key K2 to generate a composite decryption key K3. The composite decryption key K3 is used to decrypt the input write information SP by using the decryption algorithm A. Output to the ROM 102.

At this time, since the ROM 102 is in the writable state as described above, the decrypted write information P is written in the ROM 102.

Write information SP of master file 108
Is an authentication key K1,
It is generated by performing an encryption process using the encryption key K2 and the algorithm A. On the other hand, the decryption write information P
Is decrypted using the authentication key K1, the decryption key K2, and the algorithm A. Since the encryption and decryption are completely associated with each other, the decryption write information P is the regular game program information. It is the same as P0.

The write information SP is, for example, an authentication key K
1. If any one of the encryption key (decryption key) K2 and the algorithm A is created by a third party who does not know in advance, the decryption write information P matches the regular game program information P0. Therefore, as described above, even if the gaming machine is operated, the gaming machine runs out of control.

In this case, the decryption write information P is
Before writing to the OM 102, it may be compared with the regular game program information P0 and written only when they match. In that case, the ROM writer 107
The M mode and the read mode R are turned on. At this time, the decryption write information P and the decryption authentication key K1 generated by the decryption circuit 103 are transmitted to the RO
The information is fed back to the M writer 107, and the ROM writer 107 compares the regular game program information P0 with the authentication key K1 of the master file. Then, only when the decrypted write information P matches the regular game program information P0 and the decryption authentication key K1 matches the authentication key K1 of the master file, the decryption write information P is written to the ROM 102. . In this way, by confirming the match before writing to the ROM 102, it is possible to reliably prevent unauthorized game program information from being written.

Also, the game control device 100 having the above-described configuration
Authentication of the decryption key K2 and the decryption algorithm A stored in the decryption circuit 103 is performed by itself. This self-verification is performed by a cooperative operation of an operation by software performed by the CPU 101 according to the self-verification program PD in the mask ROM 109 and an operation performed by the self-verification circuit 105, and is performed every time the power is turned on.

That is, the self-verification circuit 105 includes a CPU
Based on the command from 101, first, the encryption authentication key SK1
And outputs the self-test information SI to the decoding circuit 103. Next, the decryption circuit 103 generates a composite decryption key K3 by the above-described composite key generation procedure based on the encrypted authentication key SK1, and uses the composite decryption key K3 and the decryption algorithm A to perform self-verification. The self-inspection information SI from the circuit 105 is decoded, and the decoded self-inspection information SI is output to the self-verification circuit 105. In the self-verification circuit 105,
It is determined whether or not the decryption self-check information I matches the self-check reference information I0 stored in advance, and if they do not match, as described above, the decryption key K2 or the decryption algorithm A Is determined to have been tampered with, and unauthorized processing such as stopping the operation of the gaming machine thereafter is performed.

[0056]

Since the present invention has the above-described configuration,
The following effects can be obtained. According to the first aspect of the present invention, the write information is decrypted using the built-in decryption key and the algorithm. Therefore, as long as the decryption key of the decryption means is unknown to a third party, the third information is decrypted. Even if a player creates and inputs write information, the decrypted write information is not correctly decrypted and cannot be legitimate game program information. Therefore, even if the game program information is rewritten from the outside, the gaming machine cannot be operated normally and its use can be prevented, so that the tampering of the game program information stored in the memory can be reliably prevented. it can.

Further, even if an attempt is made to illegally rewrite the game program information from the outside, the game machine does not operate normally and runs out of control, so that the illegality can be immediately detected, and the game using the illegal game program cannot be performed. Since it does not hold,
There is no loss to the game store.

Further, since only the game program information is written in the memory and the information necessary for authentication is not written, the memory can be utilized as effectively as possible.

According to the third aspect of the invention, since the inside of the decryption means is self-verified, even if a third party falsifies the decryption key or decryption algorithm of the decryption means, the decryption by the decryption means is possible. Even if the game program is skillfully managed and the game program information is rewritten, tampering in the decryption means can be reliably detected by self-verification.

If the authentication of the decryption key or the like by the self-verification is performed, the rewriting of the game program information in the memory can be completely prevented without fail. Therefore, the game control is normally performed only by performing the self-verification. The security of the device can be sufficiently maintained.

Moreover, since this self-verification is only performed by decoding the self-check information and comparing it, the amount of data to be processed is small and can be completed in a short time. Even if the self-verification is performed every time the gaming machine is started up, The game machine can be smoothly shifted to the normal operation.

According to the fifth aspect of the present invention, the decoding means comprises:
A decryption authentication key generated by decrypting an externally encrypted authentication key and a decryption key that is owned in advance generate a composite decryption key, and the decryption of the write information is performed using the composite decryption key. However, in the encryption process at the stage of creating the write information, it is necessary to know the decryption authentication key, the decryption key, and the decryption algorithm in advance, so that a third party performs the encryption process in advance. The possibility of performing the game program is further reduced, and the falsification of the game program information stored in the memory can be more reliably prevented.

Further, in the invention according to claim 6, since the self-verifying means outputs the encrypted authentication key to the decoding means in addition to the self-inspection information, the self-verification means decodes the information using the decoding algorithm with the combined decoding key. It is possible to carry out self-verification corresponding to the configuration of the decryption means for performing the decryption, and to reliably detect tampering in the decryption means. Therefore, the security of the decryption means can be reliably ensured, and it is possible to completely prevent an unauthorized act on the game control device.

[Brief description of the drawings]

FIG. 1 is a principle block diagram of a game control device of the present invention.

FIG. 2 is a principle block diagram according to a second embodiment of the present invention.

FIG. 3 is a diagram showing a configuration example of a game control device of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Game control device 2 Memory 3 Decryption means 4 Switching means 5 Self-verification means 6 Encryption means 10 Game control device 20 Memory 30 Decryption means 40 Switching means 50 Self-verification means 61 Encryption means 62 Encryption means 100 Game control device 101 CPU 102 ROM 103 Decryption circuit 104 Switching circuit 105 Self-verification circuit 106 R / W selection circuit 107 ROM writer 108 Master file 109 Mask ROM A Decryption algorithm (encryption algorithm, algorithm) I Decryption self-inspection information I0 Self-inspection reference information K Decryption key (encryption) Key) K1 Decryption authentication key (authentication key) K2 Decryption key (encryption key) K3 Synthetic decryption key (synthetic encryption key) P Decryption write information (original information) Pr Game program information P0 Regular game program information SI Self-check Information SK1 Encryption authentication key SP Write information

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Ken Osawa 2-7-10 Daida, Setagaya-ku, Tokyo (72) Inventor Koji Sasaki 553-1 Shinano-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture (72) Inventor Takeo Moriya 4-2524-5 Wakasa, Tokorozawa-shi, Saitama F-term (reference) 2C088 BC45 DA21 5B017 AA07 BA05 BA07 CA15

Claims (6)

[Claims] 1. A game control device provided in each game machine for controlling the operation of the game machine based on game program information, comprising: a memory for storing the game program information; a predetermined decryption key and a predetermined decryption algorithm. Decoding means for decoding the information, and switching means for switching the write information to be sent to the decoding means when the write information to the memory is externally input, the decoding means comprising: A game control device comprising: decoding write information from a switching means to generate decoded write information; and outputting the decoded write information to a memory for writing. 2. Decoding means for comparing decrypted and written information generated by decoding by the decrypting means with regular game program information and determining whether or not both match each other. The game control device according to claim 1, wherein when the game program information matches, the decrypted write information is written to a memory. 3. The self-inspection information of the self-inspection information and the self-inspection reference information stored in advance in a non-rewritable manner is output to the decoding means, and the self-inspection information decoded by the decoding means is received. 2. The game control device according to claim 1, further comprising: self-verification means for comparing the decrypted self-test information with self-test reference information to determine whether or not the two match. 4. The game control device according to claim 3, wherein the self-verification means stops the operation of the gaming machine when the decrypted self-check information and the self-check reference information do not match. 5. A game control device provided in each game machine for controlling the operation of the game machine based on game program information, comprising: a memory for storing the game program information; a predetermined decryption key and a predetermined decryption algorithm. Decoding means for decoding the information, and switching means for switching the write information to be sent to the decoding means when the write information to the memory is input from outside, the decoding means comprising: The decrypted encryption authentication key is decrypted according to the decryption algorithm to generate a decryption authentication key, and then a decryption key is generated using the decryption authentication key and the predetermined decryption key. The input write information is decrypted using the decryption algorithm by the synthesized decryption key, and the decryption / write obtained by the decryption is performed. Information was written is output to the memory, the game control device, characterized in that. 6. An encrypted authentication key, self-inspection information and self-inspection reference information stored in advance in a non-rewritable manner.
The encrypted authentication key and the self-inspection information are output to the decryption means, and the decryption means decrypts the self-inspection information by using the composite decryption key obtained in the composite key generation procedure based on the encrypted authentication key. Self-verification means for receiving the decrypted self-inspection information from the decoding means, comparing the decrypted self-inspection information with the self-inspection reference information, and judging whether or not both coincide with each other. The game control device according to claim 5.