JP2001062128A - Verification method of game machine, game machine, and verification device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it hard to forge CPU by analysis of the CPU and a mimicry and to verify the truth/false of a control program by generating a pair of a verification cryptography key and a verification decoding key in a verification device and implementing the readout from ROM through encryption in collation. SOLUTION: In verification of a game machine, at first a pair of a verification cryptography key and a verification decoding key are generated in the verification device 50 and the verification cryptography key is transmitted to the game machine 10. Then, a control program is encoded using the verification cryptography key transmitted from the verification device 50 by a CPU 20 in the game machine 10. Verification cryptography data are transmitted to the verification device 50 and the control program by the verification device 50 is read out using the verification cryptography data. The readout verification cryptography data is decoded using the verification decoding key generated before, the decoding data is collated with collation data, and the truth/false of the control program written in a ROM 30 of the game machine 10 is judged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for verifying that a control program and a CPU are authentic in a gaming machine, particularly a pachinko gaming machine or a slot machine.
And a game machine and a verification device used in the method.

[0002]

2. Description of the Related Art Conventionally, in a gaming machine such as a pachinko gaming machine or a slot machine, by replacing a ROM in which a control program is written, an illegal operation may be performed so that the player has an advantageous condition. is there.
Such fraud often occurs in pachinko machines and slot machines, because the obtained gaming balls or medals can be exchanged for prizes, and in some cases, direct benefits such as being able to exchange the prizes are possible. Because it is big.

Further, such a pachinko game machine or a slot machine may appear on a so-called second-hand market after a predetermined period of use. Such a gaming machine is easily available, and it is easy for a person having programming knowledge to decode the control program from the obtained gaming machine. Therefore, it is also easy for such a person to rewrite the decrypted control program with an unauthorized program, so that such unauthorized access is permitted.

[0004] In order to prevent such misconduct, conventionally,
Various measures were taken. For example, there is a method of sealing a board case with a stamp. In this method, the stamp must be peeled or torn in order to replace the ROM therein. Therefore, an attempt is made to detect an unauthorized ROM by checking the certificate stamp.

There is also a means for reading out a control program from a ROM mounted on a game machine and comparing it with a genuine control program to find an illegality.
Further, when an unauthorized ROM is mounted, a so-called CPU with a security function that stops the operation of the CPU or prevents the CPU from executing the game may be employed in the gaming machine.

[0006]

[0006] Despite the employment of the above-mentioned means, the spread of fraud has not stopped. For example, when sealing the board case with a stamp, the ROM can be freely replaced simply by carefully peeling off the stamp.

[0007] In addition, in the verification of the control program, in addition to the genuine control program, an illicit ROM in which an illegitimate control program is written is replaced with a genuine ROM. This unauthorized ROM is formed so that a genuine control program is output for external reading for collation, but an unauthorized control program is executed during a game. Therefore, there has been a case where an illegal program is actually executed although the verification test is passed.

In addition, a CPU with a security function has been fraudulently replaced not only with the ROM but also with the CPU. On the other hand, the conventional countermeasures against fraud are all assumed to be fraudulent to the ROM except for a physical seal such as a stamp. However, as a fraudulent method, in addition to falsification of a control program written in a ROM which has conventionally been mainstream, remodeling of a CPU can be considered. That is, the control program written in the ROM is left as it is, and for example, when it is determined that the genuine control program is "losing", the CPU determines that this is a "hit" and outputs it. Such fraud cannot be naturally prevented only by countermeasures against ROM.

[0009] Among the above problems, the present invention aims at preventing fraud in collating a control program written in a ROM and collating a CPU. That is, according to the first to third aspects of the present invention, reading from the ROM at the time of collation is always performed through encryption, thereby making it difficult to forge the CPU by analyzing and mimicking the CPU. Another object is to verify the authenticity of the CPU by verifying the authenticity of the control program.

According to the invention described in claims 4 to 6, the encryption key itself for encryption is synthesized with the authenticity control program and encrypted, so that the forgery of the CPU due to the analysis and the imitation of the CPU is further improved. It is another object of the present invention to verify the authenticity of the CPU by verifying the authenticity of the control program. In addition, the inventions according to claims 7 to 9 combine the encryption key itself for encryption with the genuine control program and encrypt it, thereby making it more difficult to analyze the CPU and forge the CPU by mimicry. Along with the CP
The purpose is to directly verify the authenticity of U.

Further, according to the present invention, a random number is generated at the time of encryption, and the generated random number is combined with a genuine control program and encrypted. An object of the present invention is to make forgery of a CPU difficult and verify the authenticity of a CPU by verifying the authenticity of a control program.

[0012]

SUMMARY OF THE INVENTION In view of the above-mentioned problems, a game machine verification method according to a first aspect of the present invention includes a verification encryption key in a verification device. A verification key generation step of generating a pair of a verification decryption key and a verification encryption key, a key transmission step of transmitting the verification encryption key from the verification device 50 to the gaming machine 10, and a CPU 20 in the gaming machine 10, The same gaming machine
A verification encryption step of converting the control program recorded in the ROM 30 of 10 into verification encryption data encrypted by the verification encryption key received from the verification device 50;
The encryption data for verification is transmitted from the gaming machine 10 to the verification device.
A cryptographic transmission step of transmitting to the verification device 50, and the verification encryption data received from the gaming machine 10 in the verification device 50, a verification decryption step of using the verification decryption key as the verification decryption data. And collating the decrypted data for verification with predetermined collation data.

The "gaming machine" refers to a device in which the CPU 20 controls the game in accordance with a control program written in the ROM 30, and specifically refers to a pachinko gaming machine, a slot machine, and the like. The “verification device” is a device for verifying whether one or both of the control program and the CPU 20 are genuine. Specifically, the ROM 30
A device that reads a control program from a device.

The game machine verification method according to the present invention is executed as follows. First, in the verification key generation stage, a pair of a verification encryption key and a verification decryption key is generated in the verification device 50. The “verification encryption key” and “verification decryption key” may be used in either an asymmetric encryption system or a symmetric encryption system, or may be an encryption system combining an asymmetric encryption system and a target encryption system. What is used may be used.

As the asymmetric cryptosystem, RSA cryptosystem,
Various schemes such as an El Gamal scheme and an elliptic curve cryptosystem can be adopted. In any of the methods, plaintext is obtained by encrypting a plaintext by an operation using an encryption key and decrypting the ciphertext by an operation using a decryption key. Here, the difference between the encryption key and the decryption key is the reason why the key is regarded as “asymmetric”. Further, the encryption key is usually made public, but it is usually extremely difficult to obtain a decryption key from the encryption key.

On the other hand, in the target encryption system, the above “verification encryption key” and “verification decryption key” are the same.
Next, in the key transmission stage, the verification encryption key is transmitted to the gaming machine 10. Note that the verification decryption key is stored in the verification device 50 until later decryption. Then, in the verification encryption stage, the control program is encrypted by the CPU 20 in the gaming machine 10 using the verification encryption key transmitted from the verification device 50. Specifically, after the control program is digitized according to a predetermined rule, the same numerical value is calculated using the verification encryption key to obtain verification encryption data.

Next, in the encryption transmission stage, the above-mentioned encryption data for verification is transmitted to the verification device 50. That is, the reading of the control program by the verification device 50 is always performed by the verification encryption data.
Then, in the decryption step for verification, the read encryption data for verification is decrypted using the decryption key for verification generated previously as a pair with the encryption key for verification. In particular,
The verification decryption data is obtained by calculating the verification encryption data using the verification decryption key.

Next, in the collation stage, the decryption data for verification is collated with collation data representing a control program to be verified. Here, the decryption data for verification should match the data for verification only when the control program written in the ROM 30 of the gaming machine 10 is genuine and the CPU 20 is genuine. If the decryption data for verification does not match the data for verification, the control program or the CPU 20 is not authentic.

That is, the reading of the control program is as follows:
It is not performed as it is written in the ROM 30, but is always performed after encryption. If the contents of the verification encryption stage are private, a third party who does not know the contents of the verification encryption stage Is a non-authentic control program and a non-authentic C such that the verification composite data matches the verification data.
This is because it is impossible to create PU20.

It is possible for a person who intends to perform fraud during transmission / reception in the reading process to obtain the verification encryption data and the verification encryption key. Is usually very difficult for asymmetric cryptosystems. Accordingly, since it is virtually impossible to decode them into a control program, it is possible to make it extremely difficult to decode a genuine control program.

Further, since only the control program correctly encrypted in the verification encryption stage is correctly decrypted by the verification device 50, the control program is verified by the verification device 50 to verify the authenticity of the CPU 20. It is also possible to do. (Claim 2) Of the present invention, the invention according to claim 2 is characterized in that a CPU 20 for controlling a game, a ROM 30 in which a game control program is recorded, and a verification transmitted from a verification device 50 described below. A key receiving unit 40 for receiving an encryption key for verification, a verification encryption unit 25 for converting a control program recorded in the ROM 30 into encryption data for verification encrypted by the encryption key for verification, A gaming machine 10 having encryption transmitting means 45 for transmitting encrypted data to a verification device 50 described below, wherein the verification key generation means 60 generates a pair of a verification encryption key and a verification decryption key; Key transmitting means 70 for transmitting the verification encryption key to the key receiving means 40 of the gaming machine 10,
An encryption receiving unit 75 that receives the verification encryption data transmitted from the encryption transmission unit 45, and the verification encryption data,
A verification device 50 comprising: a verification decryption unit 80 that uses the verification decryption key to generate verification decryption data; and a verification unit 90 that verifies the verification decryption data with predetermined verification data.
, The authenticity of the control program recorded in the ROM 30 can be verified.

That is, the gaming machine 10 according to the present invention can be verified by the gaming machine verification method according to the first aspect. The “CPU” controls the gaming machine 10 according to a control program written in the ROM 30 described below. "R
The control program is written in “OM”. This control program may be encrypted in advance by a predetermined method.

The "key receiving means" is generated and transmitted by the verification key generation means 60 of the verification device 50 described later in the key transmission step in the game machine verification method of the first aspect. Associated with the received verification encryption key. Specifically, it refers to input means such as an input port. The “encryption means for verification” means that, in the encryption step for verification in the game machine verification method according to claim 1, the control program which is a plain text is transmitted using the verification encryption key received by the key receiving means 40. Means for making encrypted data for verification. The verification encryption unit 25 may be realized as software executed by the CPU 20, but is more preferably configured as hardware on the CPU 20.

The "encryption transmission means" means an output port or the like for transmitting the verification encryption data to the verification device 50 in the encryption transmission step in the game machine verification method according to the first aspect. Means output means. By the above,
The gaming machine 10 according to the present invention, when reading out the control program, to encrypt and output the control program,
It is extremely difficult for a third party to decipher the control program. In addition, in order to analyze the control program, it is necessary to analyze the verification encryption unit 25.
Without the verification device 50, it is extremely difficult to analyze a control program.

(Claim 3) In the present invention, the invention according to claim 3 further comprises a verification key generating means 60 for generating a pair of a verification encryption key and a verification decryption key; Key transmitting means 70 for transmitting a key to the following gaming machine 10;
An encryption receiving unit 75 that receives the encrypted cryptographic data transmitted from 10; and a decryption unit for verification 80 that converts the encrypted cryptographic data for verification into decryption data for verification using the decryption key for verification.
A verification device 50 having verification means 90 for verifying the decryption data for verification with predetermined verification data, a CPU 20 for controlling a game, a ROM 30 on which a game control program is recorded, Key receiving means 40 for receiving the verification encryption key transmitted from the key transmitting means 70;
A verification encryption unit 25 that converts the control program recorded in the verification program 30 into verification cryptographic data encrypted by the verification cryptographic key, and a cryptography that transmits the verification cryptographic data to the cryptographic reception unit 75. Gaming machine 10 having transmission means 45
Wherein the authenticity of the control program recorded in the ROM 30 can be verified.

That is, the verification device 50 according to the present invention
A verification device 50 used in the game machine verification method according to claim 1 is provided. The "verification key generation means" refers to means for generating a pair of a verification encryption key and a verification decryption key in the verification key generation step in the game machine verification method according to the first aspect.

The verification encryption key and the verification decryption key may be used in either an asymmetric encryption system or a symmetric encryption system.
Further, an encryption system that is used in a combination of an asymmetric encryption system and a target encryption system may be used. Here, when these keys are used in the asymmetric encryption system, they are generated in accordance with the key generation rules in the asymmetric encryption system. This rule depends on which encryption system is used,
In any of the encryption systems, the plaintext encrypted with the encryption key has the characteristic of being restored to the original plaintext after being decrypted with the decryption key. In addition, it is usually very difficult to obtain the other from only one of the encryption key and the decryption key generated in the asymmetric encryption system.

When the symmetric encryption system is adopted, the above-mentioned verification encryption key and verification decryption key are the same. The "key transmitting means" means an output port or the like for transmitting the verification encryption key to the gaming machine 10 in the key transmitting step in the gaming machine verification method according to claim 1. Means.

The "encryption receiving means" is encrypted and transmitted by the verification encrypting means 25 of the gaming machine 10 in the encryption transmitting step in the gaming machine verification method of the first aspect. Input means, such as an input port, for receiving verification encryption data. The "verifying decryption means" means the verification key data generated by the verification key generation means 60 in the verification decryption step of the gaming machine verification method according to claim 1. Means for using decryption keys to generate decryption data for verification.

The "collating means" refers to means for comparing and collating the decrypted verification data with predetermined collation data in the collation step in the gaming machine verification method according to the first aspect. This collation data is data representing a control program that should be originally written in the ROM 30 of the gaming machine 10. By the above, the verification device 50 according to the present claim,
Since the encrypted control program is input when the control program is read, it is extremely difficult for a third party to decrypt the control program. Also,
In order to analyze the control program, verification encryption means
Since it is necessary to analyze 25, the verification device according to the present claim
Without 50, it is extremely difficult to analyze the control program for the gaming machine 10 according to the second aspect.

(Claim 4) In the present invention, the game machine verification method according to the invention described in claim 4 is a verification method for generating a pair of a verification encryption key and a verification decryption key in the verification device 50. Key generating step, a key transmitting step of transmitting the verification encryption key from the verification device 50 to the gaming machine 10, and a CPU 20 in the gaming machine 10.
Thereby, the control program recorded in the ROM 30 of the gaming machine 10 and the verification encryption key are combined to form synthesized data, and the synthesized data is generated by the verification encryption key received from the verification device 50. A verification encrypting step for making encrypted verification encryption data; an encryption transmission step for transmitting the verification encryption data from the gaming machine 10 to the verification device 50; The verification encryption data received from the device 10 is used as the verification decryption data using the verification decryption key, and the verification decryption step of decomposing the verification decryption data into a program part and a key part. A collating step of collating the program portion with predetermined collation data.

The "game machine" refers to a device in which the CPU 20 controls the game in accordance with a control program written in the ROM 30, and specifically refers to a pachinko game machine, a slot machine, and the like. The “verification device” is a device for verifying whether one or both of the control program and the CPU 20 are genuine. Specifically, the ROM 30
A device that reads a control program from a device.

The game machine verification method according to the present invention is executed as follows. First, in the verification key generation stage, a pair of a verification encryption key and a verification decryption key is generated in the verification device 50. The “verification encryption key” and “verification decryption key” may be used in either an asymmetric encryption system or a symmetric encryption system, or may be an encryption system combining an asymmetric encryption system and a target encryption system. What is used may be used.

As the asymmetric cryptosystem, RSA cryptosystem,
Various schemes such as an El Gamal scheme and an elliptic curve cryptosystem can be adopted. In any of the methods, plaintext is obtained by encrypting a plaintext by an operation using an encryption key and decrypting the ciphertext by an operation using a decryption key. Here, the difference between the encryption key and the decryption key is the reason why the key is regarded as “asymmetric”. Further, the encryption key is usually made public, but it is usually extremely difficult to obtain a decryption key from the encryption key.

On the other hand, in the symmetric encryption system, the above “verification encryption key” and “verification decryption key” are the same.
Next, in the key transmission stage, the verification encryption key is transmitted to the gaming machine 10. Note that the verification decryption key is stored in the verification device 50 until later decryption. Then, in the verification encryption stage, the control program is encrypted by the CPU 20 in the gaming machine 10 using the verification encryption key transmitted from the verification device 50. Specifically, after the control program is digitized according to a predetermined rule, the numerical value is converted into synthetic data by a predetermined operation with the verification encryption key.
Next, the composite data is operated using the verification encryption key to obtain the verification encryption data.

Next, in the encryption transmission stage, the above-mentioned encryption data for verification is transmitted to the verification device 50. That is, the reading of the control program by the verification device 50 is always performed by the verification encryption data.
Then, in the decryption step for verification, the read encryption data for verification is decrypted using the decryption key for verification generated previously as a pair with the encryption key for verification. In particular,
The verification decryption data is obtained by calculating the verification encryption data using the verification decryption key. Next, the decryption data for verification is decomposed into a program portion and a key portion by an inverse operation of the operation for obtaining the composite data.

Next, in the collation stage, the program portion is collated with collation data representing a control program to be verified. Here, only when the control program written in the ROM 30 of the gaming machine 10 is genuine and the CPU 20 is genuine, the program portion should match the collation data. That is, the reading of the control program is not performed as it is in the state written in the ROM 30, but is always performed after encryption. If the contents of the encryption step for verification are not disclosed, the encryption step for verification is performed. This is because it is impossible for a third party who does not know the contents of the above to create a non-authentic control program and a non-authentic CPU 20 such that the above program portion matches the collation data.

It is possible for a person who intends to perform fraud during transmission / reception in the reading process to obtain the verification encryption data and the verification encryption key. Is usually very difficult for asymmetric cryptosystems. Accordingly, since it is virtually impossible to decode them into a control program, it is possible to make it extremely difficult to decode a genuine control program.

Further, since only the control program correctly encrypted by the verification encryption stage is correctly decrypted by the verification device 50, the verification program is verified by the verification device 50 to verify the authenticity of the CPU 20. It is also possible to do. (Claim 5) Of the present invention, the invention according to claim 5 is characterized in that a CPU 20 for controlling a game, a ROM 30 in which a game control program is recorded, and a verification transmitted from a verification device 50 described below. Key receiving means 40 for receiving a cryptographic key for use, and synthetic data obtained by synthesizing the control program recorded in the ROM 30 with the cryptographic key for verification, and encrypting the composite data with the cryptographic key for verification. A gaming machine 10 having a verification encryption unit 25 for performing verification cryptographic data, and a cryptographic transmission unit 45 for transmitting the verification cryptographic data to a verification device 50 described below. Verification key generation means 60 for generating a pair with a verification decryption key, key transmission means 70 for transmitting the verification encryption key to the key reception means 40 of the gaming machine 10, and transmission from the encryption transmission means 45. Password for receiving encrypted verification data Signal receiving means 75 and the decryption data for verification 80 for converting the encrypted data for verification into decrypted data for verification using the decryption key for verification, and decomposing the decrypted data for verification into a program portion and a key portion. And a verification device 50 having verification means 90 for verifying the program portion against predetermined verification data.
The authenticity of the control program recorded in the program can be verified.

That is, the gaming machine 10 according to the present invention can be verified by the gaming machine verification method according to the fourth aspect. The “CPU” controls the gaming machine 10 according to a control program written in the ROM 30 described below. "R
The control program is written in “OM”. This control program may be encrypted in advance by a predetermined method.

The "key receiving means" is generated and transmitted by the verification key generation means 60 of the verification device 50 described later in the key transmission step in the game machine verification method according to claim 4. Associated with the received verification encryption key. Specifically, it refers to input means such as an input port. The “encryption means for verification” means that the control program, which is a plaintext, is combined with the encryption key for verification once received by the key receiving means 40 in the encryption step for verification in the game machine verification method according to claim 4. After that, it refers to means for converting the data into verification encryption data using the verification encryption key. This verification encryption means 25
May be realized as software executed by the CPU 20, but is more preferably configured as hardware on the CPU 20.

The "encryption transmission means" means an output port or the like for transmitting the verification encryption data to the verification device 50 in the encryption transmission step in the game machine verification method according to the present invention. Means output means. By the above,
The gaming machine 10 according to the present invention, when reading out the control program, to encrypt and output the control program,
It is extremely difficult for a third party to decipher the control program. In addition, in order to analyze the control program, it is necessary to analyze the verification encryption unit 25.
Without the verification device 50, it is extremely difficult to analyze the control program.

(Claim 6) In the present invention, the invention according to claim 6 further comprises a verification key generating means 60 for generating a pair of a verification encryption key and a verification decryption key; Key transmitting means 70 for transmitting a key to the following gaming machine 10;
The cryptographic receiving means 75 for receiving the cryptographic data for verification transmitted from 10, and the cryptographic data for verification, as the decrypted data for verification using the decryption key for verification, and the decrypted data for verification as a program part. A verification device 50 having a decryption means for verification 80 for decomposing into a key part, and a collation means 90 for collating the program part with predetermined collation data, wherein a CPU 20 for controlling a game; ROM 30 in which a control program is recorded, and key receiving means 40 for receiving the verification encryption key transmitted from the key transmitting means 70,
Verification encryption, in which the control data recorded in the ROM 30 and the verification encryption key are combined to generate composite data, and the composite data is used as the verification encryption data encrypted with the verification encryption key. In the gaming machine 10 having the means 25 and the encryption transmitting means 45 for transmitting the verification encryption data to the encryption receiving means 75, the authenticity of the control program recorded in the ROM 30 can be verified. And

That is, the verification device 50 according to the present invention
A verification device 50 used in the game machine verification method according to claim 4 is provided. The “verification key generation means” refers to means for generating a pair of a verification encryption key and a verification decryption key in the verification key generation step in the game machine verification method according to claim 4.

The verification encryption key and the verification decryption key may be used in either an asymmetric encryption system or a symmetric encryption system.
Further, an encryption system that is used in a combination of an asymmetric encryption system and a target encryption system may be used. Here, when these keys are used in the asymmetric encryption system, they are generated in accordance with the key generation rules in the asymmetric encryption system. This rule depends on which encryption system is used,
In any of the encryption systems, the plaintext encrypted with the encryption key has the characteristic of being restored to the original plaintext after being decrypted with the decryption key. In addition, it is usually very difficult to obtain the other from only one of the encryption key and the decryption key generated in the asymmetric encryption system.

When a symmetric encryption system is adopted, the above-mentioned verification encryption key and verification decryption key are the same. The "key transmitting means" means an output port or the like for transmitting the verification encryption key to the gaming machine 10 in the key transmitting step in the gaming machine verification method according to claim 4. Means.

[0047] The "encryption receiving means" is encrypted and transmitted by the verification encrypting means 25 of the gaming machine 10 in the encryption transmitting step in the gaming machine verification method according to claim 4. Input means, such as an input port, for receiving verification encryption data. The "verifying decryption means" refers to the verification decryption data generated by the verification key generation means 60 in the verification decryption step of the gaming machine verification method according to claim 4. A means for dividing the decryption data for verification into a program portion and a key portion by a predetermined operation after using the decryption key as the decryption data for verification.

The "collating means" refers to means for comparing and collating the program portion with predetermined collation data in the collation stage in the gaming machine verification method according to the fourth aspect. This collation data is data representing a control program that should be originally written in the ROM 30 of the gaming machine 10. By the above, the verification device 50 according to the present claim,
Since the encrypted control program is input when the control program is read, it is extremely difficult for a third party to decrypt the control program. Also,
In order to analyze the control program, verification encryption means
Since it is necessary to analyze 25, the verification device according to the present claim
Without 50, it is extremely difficult to analyze the control program for the gaming machine 10 according to the fifth aspect.

(Claim 7) A game machine verification method according to a seventh aspect of the present invention is a verification method for generating a pair of a verification encryption key and a verification decryption key in a verification device 50. Key generating step, a key transmitting step of transmitting the verification encryption key from the verification device 50 to the gaming machine 10, and a CPU 20 in the gaming machine 10.
Thereby, the control program recorded in the ROM 30 of the gaming machine 10 and the verification encryption key are combined to form synthesized data, and the synthesized data is generated by the verification encryption key received from the verification device 50. A verification encrypting step for making encrypted verification encryption data; an encryption transmission step for transmitting the verification encryption data from the gaming machine 10 to the verification device 50; The verification encryption data received from the device 10 is used as the verification decryption data using the verification decryption key, and the verification decryption step of decomposing the verification decryption data into a program part and a key part. A collating step of collating the key portion with a verification encryption key.

The "gaming machine" refers to a device in which the CPU 20 controls the game in accordance with a control program written in the ROM 30, and specifically refers to a pachinko gaming machine, a slot machine, and the like. The “verification device” is a device for verifying whether or not the CPU 20 is authentic.

The game machine verification method according to the present invention is executed as follows. First, in the verification key generation stage, a pair of a verification encryption key and a verification decryption key is generated in the verification device 50. The “verification encryption key” and “verification decryption key” may be used in either an asymmetric encryption system or a symmetric encryption system, or may be an encryption system combining an asymmetric encryption system and a target encryption system. What is used may be used.

As the asymmetric cryptosystem, RSA cryptosystem,
Various schemes such as an El Gamal scheme and an elliptic curve cryptosystem can be adopted. In any of the methods, plaintext is obtained by encrypting a plaintext by an operation using an encryption key and decrypting the ciphertext by an operation using a decryption key. Here, the difference between the encryption key and the decryption key is the reason why the key is regarded as “asymmetric”. Further, the encryption key is usually made public, but it is usually extremely difficult to obtain a decryption key from the encryption key.

On the other hand, in the symmetric encryption system, the above “verification encryption key” and “verification decryption key” are the same.
Next, in the key transmission stage, the verification encryption key is transmitted to the gaming machine 10. Note that the verification decryption key is stored in the verification device 50 until later decryption. Then, in the verification encryption stage, the control program is encrypted by the CPU 20 in the gaming machine 10 using the verification encryption key transmitted from the verification device 50. Specifically, after the control program is digitized according to a predetermined rule, the numerical value is converted into synthetic data by a predetermined operation with the verification encryption key.
Next, the composite data is operated using the verification encryption key to obtain the verification encryption data.

Next, in the encryption transmission stage, the encryption data for verification is transmitted to the verification device 50. That is, the reading of the control program by the verification device 50 is always performed by the verification encryption data.
Then, in the decryption step for verification, the read encryption data for verification is decrypted using the decryption key for verification generated previously as a pair with the encryption key for verification. In particular,
The verification decryption data is obtained by calculating the verification encryption data using the verification decryption key. Next, the decryption data for verification is decomposed into a program portion and a key portion by an inverse operation of the operation for obtaining the composite data.

Next, in the collation stage, the key portion is:
It is checked against the previously generated verification encryption key. Here, if the CPU 20 of the gaming machine 10 is genuine, the key portion should match the verification encryption key. If the key portion does not match the verification encryption key, the CPU 20
Is not authentic. That is, the reading of the control program is not performed as it is in the state written in the ROM 30, but is always performed after encryption. If the contents of the encryption step for verification are not disclosed, the encryption step for verification is performed. This is because it is impossible for a third party who does not know the contents of the above to create the CPU 20 which is not genuine such that the key portion matches the verification encryption key.

It is possible for a person who intends to cheat during transmission / reception in the reading process to obtain the verification encryption data and the verification encryption key. Is usually very difficult for asymmetric cryptosystems. Accordingly, since it is virtually impossible to decode them into a control program, it is possible to make it extremely difficult to decode a genuine control program.

In addition, the fact that the verification encryption key is correctly decrypted in the verification decryption step means that the verification decryption key has been encrypted through the normal verification encryption step. Therefore, it is possible to know whether or not the CPU 20 is authentic by checking the verification encryption key. (Claim 8) Of the present invention, the invention according to claim 8 is characterized in that a CPU 20 for controlling a game, a ROM 30 in which a game control program is recorded, and a verification transmitted from a verification device 50 described below. Key receiving means 40 for receiving a cryptographic key for use, and synthetic data obtained by synthesizing the control program recorded in the ROM 30 with the cryptographic key for verification, and encrypting the composite data with the cryptographic key for verification. A gaming machine 10 having a verification encryption unit 25 for performing verification cryptographic data, and a cryptographic transmission unit 45 for transmitting the verification cryptographic data to a verification device 50 described below. Verification key generation means 60 for generating a pair with a verification decryption key, key transmission means 70 for transmitting the verification encryption key to the key reception means 40 of the gaming machine 10, and transmission from the encryption transmission means 45. Password for receiving encrypted verification data Signal receiving means 75 and the decryption data for verification 80 for converting the encrypted data for verification into decrypted data for verification using the decryption key for verification, and decomposing the decrypted data for verification into a program portion and a key portion. The authenticity of the CPU 20 can be verified using a verification device 50 having verification means 90 for verifying the key portion with a verification encryption key.

That is, the gaming machine 10 according to the present invention can be verified by the gaming machine verification method according to the seventh aspect. The “CPU” controls the gaming machine 10 according to a control program written in the ROM 30 described below. "R
The control program is written in “OM”. This control program may be encrypted in advance by a predetermined method.

The "key receiving means" is generated and transmitted by the verification key generation means 60 of the verification device 50 described later in the key transmission step in the game machine verification method according to claim 7. Associated with the received verification encryption key. Specifically, it refers to input means such as an input port. The "verifying encryption means" means that the control program, which is a plaintext, is combined with the verification encryption key once received by the key receiving means 40 in the verifying encryption step in the gaming machine verification method according to claim 7. After that, it refers to means for converting the data into verification encryption data using the verification encryption key. This verification encryption means 25
May be realized as software executed by the CPU 20, but is more preferably configured as hardware on the CPU 20.

The "encryption transmitting means" means an output port or the like for transmitting the verification cryptographic data to the verification device 50 in the cryptographic transmission step in the game machine verification method according to the present invention. Means output means. By the above,
The gaming machine 10 according to the present invention, when reading out the control program, to encrypt and output the control program,
It is extremely difficult for a third party to decipher the control program. In addition, in order to analyze the control program, it is necessary to analyze the verification encryption unit 25.
Without the verification device 50, it is extremely difficult to analyze the control program.

(Claim 9) In the present invention, the invention according to claim 9 includes a verification key generating means 60 for generating a pair of a verification encryption key and a verification decryption key; Key transmitting means 70 for transmitting a key to the following gaming machine 10;
The cryptographic receiving means 75 for receiving the cryptographic data for verification transmitted from 10, and the cryptographic data for verification, as the decrypted data for verification using the decryption key for verification, and the decrypted data for verification as a program part. A verification device 50 having a verification decryption unit 80 for decomposing the key portion and a verification unit 90 for verifying the key portion with a verification encryption key, wherein the CPU 20 performs game control, and the game control The ROM 30 in which the program is recorded, the key receiving means 40 for receiving the verification encryption key transmitted from the key transmission means 70, and the control program and the verification encryption key recorded in the ROM 30 are synthesized. In addition to the synthesized data, the synthesized data is
The gaming machine 10 includes: a verification encryption unit 25 that converts the verification encryption data into the verification encryption data encrypted by the verification encryption key; and an encryption transmission unit 45 that transmits the verification encryption data to the encryption reception unit 75. The authenticity of the CPU 20 can be verified.

That is, the verification device 50 according to the present invention
A verification device 50 used in the game machine verification method according to claim 7 is provided. The "verification key generation means" refers to means for generating a pair of a verification encryption key and a verification decryption key in the verification key generation step in the game machine verification method.

The verification encryption key and the verification decryption key may be used in either an asymmetric encryption system or a symmetric encryption system.
Further, an encryption system that is used in a combination of an asymmetric encryption system and a target encryption system may be used. Here, when these keys are used in the asymmetric encryption system, they are generated in accordance with the key generation rules in the asymmetric encryption system. This rule depends on which encryption system is used,
In any of the encryption systems, the plaintext encrypted with the encryption key has the characteristic of being restored to the original plaintext after being decrypted with the decryption key. In addition, it is usually very difficult to obtain the other from only one of the encryption key and the decryption key generated in the asymmetric encryption system.

When a symmetric encryption system is adopted, the above-mentioned verification encryption key and verification decryption key are the same. The "key transmitting means" refers to an output of an output port or the like for transmitting the verification encryption key to the gaming machine 10 in the key transmitting step in the gaming machine verification method according to claim 7. Means.

The "encryption receiving means" is the encryption and transmission step performed by the verification encrypting means 25 of the gaming machine 10 in the encryption transmitting step in the gaming machine verification method according to claim 7. Input means, such as an input port, for receiving verification encryption data. The "verifying decryption means" refers to the verification encryption data generated by the verification key generation means 60 in the verification decryption step of the gaming machine verification method according to claim 7. A means for dividing the decryption data for verification into a program portion and a key portion by a predetermined operation after using the decryption key as the decryption data for verification.

The "verification means" is means for comparing and verifying the key portion obtained by the verification decryption means 80 with the verification encryption key in the verification step of the gaming machine verification method according to claim 7. Say. As described above, when the control program is read, the encrypted control program is input to the verification device 50 according to the present invention, so that it is extremely difficult for a third party to decrypt the control program. It has become. Further, by comparing the verification encryption key with the verification device 50 according to the present invention, the C
It can be verified whether the PU 20 is authentic.

(Claim 10) Of the present invention, claim 10
The verification method of a gaming machine according to the invention described above includes a verification key generation step of generating a pair of a verification encryption key and a verification decryption key in the verification device 50; A key transmission step of transmitting from 50 to the gaming machine 10;
A random number for synthesis is generated by the PU 20 and the RO of the gaming machine 10 is generated.
The control program recorded in M30 and the random number for synthesizing are synthesized to generate synthesized data, and the synthesized data is combined with cryptographic data for verification encrypted by the verification cryptographic key received from the verification device 50. Verification encryption step to perform, the verification encryption data, an encryption transmission step of transmitting from the gaming machine 10 to the verification device 50, in the verification device 50,
The verification encryption data received from the gaming machine 10 is used as the verification decryption data using the verification decryption key, and the verification decryption step of decomposing the verification decryption data into a program part and a random number part. And a collation step of collating the program portion with predetermined collation data.

The "game machine" refers to a device in which the CPU 20 controls the game in accordance with a control program written in the ROM 30, and specifically, a pachinko game machine, a slot machine, and the like. The “verification device” is a device for verifying whether one or both of the control program and the CPU 20 are genuine. Specifically, the ROM 30
A device that reads a control program from a device.

The game machine verification method according to the present invention is executed as follows. First, in the verification key generation stage, a pair of a verification encryption key and a verification decryption key is generated in the verification device 50. The “verification encryption key” and the “verification decryption key” may be used in either an asymmetric encryption system or a symmetric encryption system.

As the asymmetric cryptosystem, RSA cryptosystem,
Various schemes such as an El Gamal scheme and an elliptic curve cryptosystem can be adopted. In any of the methods, plaintext is obtained by encrypting a plaintext by an operation using an encryption key and decrypting the ciphertext by an operation using a decryption key. Here, the difference between the encryption key and the decryption key is the reason why the key is regarded as “asymmetric”. Further, the encryption key is usually made public, but it is usually extremely difficult to obtain a decryption key from the encryption key.

On the other hand, in the symmetric encryption system, the above “verification encryption key” and “verification decryption key” are the same.
Next, in the key transmission stage, the verification encryption key is transmitted to the gaming machine 10. Note that the verification decryption key is stored in the verification device 50 until later decryption. Then, in the verification encryption stage, the control program is encrypted by the CPU 20 in the gaming machine 10 using the verification encryption key transmitted from the verification device 50. More specifically, first, a random number for synthesis is generated, and the control program is digitized according to a predetermined rule. Then, the numerical value is converted into synthesized data by a predetermined operation with the random number for synthesis. Next, the composite data is operated using the verification encryption key to obtain the verification encryption data. Here, since the synthesized data obtained from the same control program is different at each verification by being synthesized with a different random number for synthesis at each verification, the cryptographic data for verification is also different at each verification. . Therefore, the decryption performance of the encryption system is extremely high.

Next, in the encryption transmission step, the verification encryption data is transmitted to the verification device 50. That is, the reading of the control program by the verification device 50 is always performed by the verification encryption data.
Then, in the decryption step for verification, the read encryption data for verification is decrypted using the decryption key for verification generated previously as a pair with the encryption key for verification. In particular,
The verification decryption data is obtained by calculating the verification encryption data using the verification decryption key. Next, the decryption data for verification is decomposed into a program part and a random number part by an inverse operation of the operation for obtaining the composite data.

Next, in the collation stage, the program portion is collated with collation data representing a control program to be verified. Here, only when the control program written in the ROM 30 of the gaming machine 10 is genuine and the CPU 20 is genuine, the program portion should match the collation data. If the program portion does not match the collation data, the control program or CPU 20 is not authentic.

That is, the reading of the control program is as follows:
It is not performed as it is written in the ROM 30, but is always performed after encryption. If the contents of the verification encryption stage are private, a third party who does not know the contents of the verification encryption stage Is a non-authentic control program such that the verification composite data matches the verification data
This is because it is impossible to create PU20.

It is possible for a person who intends to perform fraud during the transmission / reception in the reading process to obtain the verification encryption data and the verification encryption key. Is usually very difficult for asymmetric cryptosystems. Accordingly, since it is virtually impossible to decode them into a control program, it is possible to make it extremely difficult to decode a genuine control program.

Furthermore, since only the control program correctly encrypted by the verification encryption stage 25 is correctly decrypted by the verification device 50, the verification device 50 verifies the control program so that the authenticity of the CPU 20 can be verified. It is also possible to verify. (Claim 11) Of the present invention, the invention according to claim 11 is characterized in that a CPU 20 for controlling a game, a ROM 30 in which a game control program is recorded, and a verification device 50 described below.
Receiving means 40 for receiving the verification encryption key transmitted from
A random number for synthesis is generated and synthesized data is generated by synthesizing the control program recorded in the ROM 30 and the random number for synthesis, and the synthesized data is used for verification for verification encrypted by the encryption key for verification. A gaming machine 10 having a verification encryption unit 25 as encrypted data and an encryption transmission unit 45 for transmitting the verification encryption data to the verification device 50 described below, wherein the verification encryption key and the verification decryption key are provided. And a verification key generating means 60 for generating a pair with the gaming machine 10.
A key transmitting unit 70 for transmitting to the key receiving unit 40, a cryptographic receiving unit 75 for receiving the verification cryptographic data transmitted from the cryptographic transmitting unit 45, and the verification cryptographic data using the verification decryption key. Verification decoding data, the verification decoding data is decomposed into a program part and a random number part, a verification decoding means 80, and the program part is collated with predetermined collation data by a verification means 90. The authenticity of the control program recorded in the ROM 30 can be verified using a verification device 50 having

That is, the gaming machine 10 according to the present invention can be verified by the gaming machine verification method according to the tenth aspect. The “CPU” controls the gaming machine 10 according to a control program written in the ROM 30 described below.
The control program is written in the “ROM”.
This control program may be encrypted in advance by a predetermined method.

The "key receiving means" is generated and transmitted by the verification key generation means 60 of the verification device 50 described later in the key transmission step in the game machine verification method according to claim 10. Associated with the received verification encryption key. Specifically, it refers to input means such as an input port.
The “encryption means for verification” means that the control program, which is a plaintext, is once synthesized with the generated synthesis random number in the verification encryption step in the game machine verification method according to claim 10, This means means for using the verification encryption key received by the key receiving means 40 as encryption data for verification. The verification encryption unit 25 may be realized as software executed by the CPU 20, but is more preferably configured as hardware on the CPU 20.

The "encryption transmission means" means an output port or the like for transmitting the verification encryption data to the verification device 50 in the encryption transmission step in the game machine verification method according to claim 10. Means output means. According to the above, the gaming machine 10 according to the present invention encrypts and outputs the control program when reading the control program, so that it is extremely difficult for a third party to decrypt the control program. I have. Further, in order to analyze the control program, it is necessary to analyze the verification encrypting means 25. Therefore, it is extremely difficult to analyze the control program unless the verification device 50 is used.

(Claim 12) In the present invention, the invention according to claim 12 is a verification key generating means 60 for generating a pair of a verification encryption key and a verification decryption key; Key transmitting means 70 for transmitting a key to the following gaming machine 10; cryptographic receiving means 75 for receiving the verification encrypted data transmitted from the following gaming machine 10; and the verification decryption key And a decryption means for verifying 80 for decomposing the decrypted data for verification into a program part and a random number part, and a collation means for collating the program part with predetermined collation data A verification device 50 having a CPU 90 for controlling a game, a ROM 30 in which a control program for the game is recorded, and a key receiving means for receiving a verification encryption key transmitted from the key transmitting means 70. Generates 40 and a random number for synthesis And a verification program for converting the control program recorded in the ROM 30 and the synthesizing random number into synthesized data, and using the synthesized data as verification encryption data encrypted with the verification encryption key. A gaming machine comprising: means 25; and a cipher transmitting means 45 for transmitting the verification cipher data to the cipher receiving means 75.
10, wherein the authenticity of the control program recorded in the ROM 30 can be verified.

That is, the verification device 50 according to the present invention
A verification device 50 used in the gaming machine verification method according to claim 10.
It has become. Claim 10: "Verification key generation means"
This means means for generating a pair of a verification encryption key and a verification decryption key in the verification key generation step in the above described gaming machine verification method.

The verification encryption key and the verification decryption key may be used in either an asymmetric encryption system or a symmetric encryption system.
Further, an encryption system that is used in a combination of an asymmetric encryption system and a target encryption system may be used. Here, when these keys are used in the asymmetric encryption system, they are generated in accordance with the key generation rules in the asymmetric encryption system. This rule depends on which encryption system is used,
In any of the encryption systems, the plaintext encrypted with the encryption key has the characteristic of being restored to the original plaintext after being decrypted with the decryption key. In addition, it is usually very difficult to obtain the other from only one of the encryption key and the decryption key generated in the asymmetric encryption system.

When a symmetric encryption system is employed, the above-mentioned verification encryption key and verification decryption key are the same. The “key transmitting means” means an output port or the like for transmitting the verification encryption key to the gaming machine 10 in the key transmitting step in the gaming machine verification method according to claim 10. Means.

The "encryption receiving means" is the encryption and transmission step performed by the verification encrypting means 25 of the gaming machine 10 in the encryption transmitting step in the gaming machine verification method according to claim 10. Input means, such as an input port, for receiving verification encryption data. The "verifying decryption means" refers to the verification cryptographic data generated by the verification key generation means 60 in the verification decryption step of the gaming machine verification method according to claim 10. A means for dividing the decryption data for verification into a program portion and a random number portion by a predetermined operation after using the decryption key as the decryption data for verification.

The "collating means" refers to means for comparing and collating the program portion with predetermined collation data in the collation stage in the gaming machine verification method according to claim 10. This collation data is data representing a control program that should be originally written in the ROM 30 of the gaming machine 10. By the above, the verification device 50 according to the present claim,
Since the encrypted control program is input when the control program is read, it is extremely difficult for a third party to decrypt the control program. Also,
In order to analyze the control program, verification encryption means
Since it is necessary to analyze 25, the verification device according to the present claim
Without 50, it is extremely difficult to analyze the control program for a gaming machine according to claim 11.

[0086]

Embodiments of the present invention will be described below with reference to the drawings. Here, FIG. 1 schematically shows a data flow in the gaming machine and the verification device according to the first embodiment of the present invention. FIG. 2 schematically shows a data flow in the gaming machine and the verification device according to the second embodiment of the present invention. FIG. 3 schematically shows a data flow in the gaming machine and the verification device according to the third embodiment of the invention. FIG. 4 schematically shows encryption of program data in each embodiment of the present invention.

(Encryption of Program Data) In each of the following embodiments, the ROM 30 of the gaming machine 10 stores program data that has been encrypted in advance. This encryption is performed in a process as shown in FIG. 4 in each of the following embodiments.

First, an authenticator (t) is generated by an authenticator generation function (T) based on the program data (P). next,
The program data (P) and the authenticator (t) are combined with the authenticator combining function (S
x) to generate intermediate program data (Px). On the other hand, a storage random number (rx) is generated by the storage random number generation function (Rx) based on the gaming machine model number (x). This storage random number generation function generates different storage random numbers for different game machine model numbers, but even if the same game machine model number is given,
Different storage random numbers may be generated.

Based on the storage random number (rx), a storage encryption key (ex) and a storage decryption key (d
x) is generated. The storage encryption key and the storage decryption key are to be generated by an asymmetric encryption system such as an RSA encryption system. Intermediate program data (Px)
Is converted into storage encryption data (Mx) by the storage encryption function (Fx) using the storage encryption key (ex). The storage encryption data (Mx) is recorded in the ROM 30 of the gaming machine 10 together with the storage decryption key (dx). Note that this ROM 30 is
When formed integrally with the CPU 20 that controls the control of 10, it is impossible to replace only the forged ROM. However,
When the control program is encrypted and stored in the ROM 30, the verification is performed via the CPU 20.
Even if U20 and ROM 30 are not integrated, unauthorized tampering cannot be performed.

At the same time, the storage encryption data (Mx) for each gaming machine model number (x) is stored in the database 100 of the data manager.
Stored in In this database 100, the storage encryption data (M1, M
2, ...) are also recorded. (First Embodiment) The decryption and verification of storage encrypted data in the first embodiment will be described below with reference to FIG.

(Decryption of Stored Encryption Data) The storage encryption data (Mx) recorded in the ROM 30 of the gaming machine 10 is stored in the storage decryption function (Fx ') by the storage decryption key (Fx'). It is decoded into intermediate program data (Px) using (dx). The intermediate program data (Px) is decomposed by an authenticator decomposing function (Sx ′), which is an inverse function of the authenticator synthesizing function (Sx), to obtain program data (P) and an authenticator (t). The authenticator (t) obtains an authentication result (b) as compared with the program data (P) by the authenticator verification function (T ′). C
When the authentication result (b) is satisfactory, the PU 20 executes the program data (P).

(Verification of Stored Encryption Data) When predetermined game information (h) is generated by execution of the program data (P), the storage encryption data (Mx) recorded in the ROM 30 is verified. Will be First, in the verification device 50, the verification encryption key (ey) and the verification decryption key (dy) are
Is generated.

That is, the verification random number (ry) is generated by the verification random number generation function (Ry). Based on the verification random number (ry), a verification encryption key (ey) and a verification decryption key (dy) are generated by a verification key generation function (Ky). Even if these verification encryption key (ey) and verification decryption key (dy) are always the same,
It may be updated every time verification is performed, or may be updated every time verification is performed.

Among these, the verification encryption key (ey) is transmitted by the key transmitting means 70 to the key receiving means 40 of the gaming machine 10. The decryption key for verification (dy) is stored in the memory of the verification device 50. Note that the key receiving means 40 and the encryption transmitting means 45 of the gaming machine 10 are actually formed as a single connector having a plurality of connector pins. The key transmitting means 70 and the encryption receiving means 75 in the verification device 50 are also formed as similar connectors, and these connectors are connected by a connector code.

Then, in the gaming machine 10, the storage encryption data (Mx) is encrypted by the verification encryption unit 25 for verification by the verification device 50. This verification encryption means
25 is configured as hardware in the CPU 20. Therefore, as described above, in order to falsify the contents of the game and to correctly verify the game, it is necessary to not only falsify the control program but also analyze the CPU 20.

First, the game information (h) and the encrypted data for storage (M
x) are combined with the game information combining function (Sy) to generate combined data (L1). Next, the received verification encryption key (ey)
, The composite data (L1) is encrypted into the verification encryption data (Ly) by the verification encryption function (Fy). The cryptographic data for verification (Ly) is transmitted by the cryptographic transmitting means 45 to the cryptographic receiving means 75 of the verification device 50.

Then, in the verification device 50 again, the received verification encryption data (L
y) is decrypted into the original encrypted data for storage (Mx). That is, the verification encryption data (Ly) is decrypted by the verification decryption function (Fy ′) using the verification decryption key (dy), and the intermediate verification data (L1) is obtained. This intermediate verification data (L1)
Is a game information decomposing function (Sy '), which is an inverse function of the game information synthesis function (Sy), and the game information (h) and the encryption data for storage (Mx).
And is decomposed into Among them, the game information (h) is transmitted to the hall computer (HC).

The verification device 50 stores in advance the verification data (My) to be compared with the storage encryption data (Mx) in its storage device.
Recorded in 55. The storage encryption data (Mx) obtained by the verification decryption means 80 is collated with the collation data (My) by the collation means 90. If these match, the storage encryption data recorded in the ROM 30 of the gaming machine 10
(Mx) is determined to represent a legitimate gaming program,
It is determined that the game information (h) has been generated based on the genuine control program and the genuine CPU 20.

(Second Embodiment) Decryption of encrypted data and verification thereof in the second embodiment will be described below with reference to FIG. (Decryption of Stored Encryption Data) The storage encryption data (Mx) recorded in the ROM 30 of the gaming machine 10 is stored in the storage decryption function (F
x ′), it is decrypted into intermediate program data (Px) using the storage decryption key (dx) also recorded in the ROM 30. Intermediate program data (Px) is authenticator composition function (Sx)
Decomposed by the authenticator decomposition function (Sx '), which is the inverse function of
The program data (P) and the authenticator (t) are obtained. Authenticator
In (t), an authentication result (b) is obtained by the authenticator verification function (T ′) in comparison with the program data (P). CPU 20
If the authentication result (b) is satisfactory, the program data (P) is executed.

(Verification of Stored Encryption Data) When predetermined game information (h) is generated by execution of the program data (P), the storage encryption data (Mx) recorded in the ROM 30 is verified. Will be First, in the verification device 50, the verification encryption key (ey) and the verification decryption key (dy) are
Is generated.

That is, the verification random number (ry) is generated by the verification random number generation function (Ry). Based on the verification random number (ry), a verification encryption key (ey) and a verification decryption key (dy) are generated by a verification key generation function (Ky). Even if these verification encryption key (ey) and verification decryption key (dy) are always the same,
It may be updated every time verification is performed, or may be updated every time verification is performed.

Of these, the verification encryption key (ey) is transmitted by the key transmitting means 70 to the key receiving means 40 of the gaming machine 10. The verification encryption key (ey) and the verification decryption key (dy) are
It is stored in the memory of the verification device 50. Note that the key receiving means 40 and the encryption transmitting means 45 of the gaming machine 10 are actually formed as a single connector having a plurality of connector pins. The key transmitting means 70 and the encryption receiving means 75 in the verification device 50 are also formed as similar connectors, and these connectors are connected by a connector code.

Then, in the gaming machine 10, the storage encryption data (Mx) is encrypted by the verification encryption unit 25 for verification by the verification device 50. This verification encryption means
25 is configured as hardware in the CPU 20. Therefore, as described above, in order to falsify the contents of the game and to correctly verify the game, it is necessary to not only falsify the control program but also analyze the CPU 20.

First, the game information (h) and the storage encryption data (M
x) and the received verification encryption key (ey) are used as the game information synthesis function (S
y) to generate synthesized data (L1). Using the verification encryption key (ey), the composite data (L1) is encrypted into the verification encryption data (Ly) by the verification encryption function (Fy). The cryptographic data for verification (Ly) is transmitted by the cryptographic transmitting means 45 to the cryptographic receiving means 75 of the verification device 50.

Then, in the verification device 50 again, the received verification encryption data (L
y) is decrypted into the original encrypted data for storage (Mx). That is, the verification encryption data (Ly) is decrypted by the verification decryption function (Fy ′) using the verification decryption key (dy), and the intermediate verification data (L1) is obtained. This intermediate verification data (L1)
Is a game information decomposition function (Sy '), which is the inverse function of the game information synthesis function (Sy), the game information (h), the storage encryption data (Mx)
And a verification encryption key (ey). Among them, the game information (h) is transmitted to the hall computer (HC).

In the verification device 50, the verification data (My) to be compared with the storage encryption data (Mx) is stored in advance in the storage device.
Recorded in 55. The storage encryption data (Mx) obtained by the verification decryption means 80 is collated with the collation data (My) by the collation means 90. If these match, the storage encryption data recorded in the ROM 30 of the gaming machine 10
(Mx) is determined to represent a legitimate gaming program,
It is determined that the game information (h) has been generated based on the genuine control program and the genuine CPU 20.

Furthermore, the verification encryption key (ey) obtained by the verification decryption means 80 and the verification encryption key (ey) stored in the memory of the verification device 50 are verified by the verification means 90. .
If they match, it is determined that the verification encrypting means 25 is legitimate. (Third Embodiment) Decryption of encrypted data and verification thereof in the third embodiment will be described below with reference to FIG.

(Decryption of Stored Encryption Data) The storage encryption data (Mx) recorded in the ROM 30 of the gaming machine 10 is stored in the storage decryption key (Fx ′) by the storage decryption function (Fx ′). It is decoded into intermediate program data (Px) using (dx). The intermediate program data (Px) is decomposed by an authenticator decomposing function (Sx ′), which is an inverse function of the authenticator synthesizing function (Sx), to obtain program data (P) and an authenticator (t). The authenticator (t) obtains an authentication result (b) as compared with the program data (P) by the authenticator verification function (T ′). C
When the authentication result (b) is satisfactory, the PU 20 executes the program data (P).

(Verification of Stored Encryption Data) When predetermined game information (h) is generated by executing the program data (P), the storage encryption data (Mx) recorded in the ROM 30 is verified. Will be First, in the verification device 50, the verification encryption key (ey) and the verification decryption key (dy) are
Is generated.

That is, the verification random number (ry) is generated by the verification random number generation function (Ry). Based on the verification random number (ry), a verification encryption key (ey) and a verification decryption key (dy) are generated by a verification key generation function (Ky). Even if these verification encryption key (ey) and verification decryption key (dy) are always the same,
It may be updated every time verification is performed, or may be updated every time verification is performed.

Among these, the verification encryption key (ey) is transmitted by the key transmitting means 70 to the key receiving means 40 of the gaming machine 10. The decryption key for verification (dy) is stored in the memory of the verification device 50. Note that the key receiving means 40 and the encryption transmitting means 45 of the gaming machine 10 are actually formed as a single connector having a plurality of connector pins. The key transmitting means 70 and the encryption receiving means 75 in the verification device 50 are also formed as similar connectors, and these connectors are connected by a connector code.

Then, in the gaming machine 10, the storage encryption data (Mx) is encrypted by the verification encryption unit 25 for verification by the verification device 50. This verification encryption means
25 is configured as hardware in the CPU 20. Therefore, as described above, in order to falsify the contents of the game and to correctly verify the game, it is necessary to not only falsify the control program but also analyze the CPU 20.

First, a synthesis random number (rz) is generated by the synthesis random number generation function (Rz). Next, game information
(h), the storage encryption data (Mx) and the synthesis random number (rz) are synthesized by the game information synthesis function (Sy), and the synthesis data (L1)
Is generated. Next, using the received encryption key for verification (ey), the composite data (L1) is encrypted into encryption data for verification (Ly) by the encryption function for verification (Fy). This verification encryption data (L
y) is transmitted by the encryption transmitting means 45 to the encryption receiving means 75 of the verification device 50.

Then, in the verification device 50 again, the received decryption data for verification (L
y) is decrypted into the original encrypted data for storage (Mx). That is, the verification encryption data (Ly) is decrypted by the verification decryption function (Fy ′) using the verification decryption key (dy), and the intermediate verification data (L1) is obtained. This intermediate verification data (L1)
Is a game information decomposition function (Sy '), which is the inverse function of the game information synthesis function (Sy), the game information (h), the storage encryption data (Mx)
And a random number for synthesis (rz). Among them, the game information (h) is transmitted to the hall computer (HC).

The verification device 50 stores in advance the verification data (My) to be compared with the storage encryption data (Mx) in the storage device.
Recorded in 55. The storage encryption data (Mx) obtained by the verification decryption means 80 is collated with the collation data (My) by the collation means 90. If these match, the storage encryption data recorded in the ROM 30 of the gaming machine 10
(Mx) is determined to represent a legitimate gaming program,
It is determined that the game information (h) has been generated based on the genuine control program and the genuine CPU 20.

(Others) In each of the above embodiments, the program data (P) is encrypted in advance and recorded in the ROM 30 of the gaming machine 10. However, even if this program data (P) is recorded in the ROM 30 of the gaming machine 10 as unencrypted plaintext,
The above verification can be performed similarly.

Further, in each of the above embodiments, the verification encrypting means 25 is configured as hardware, but may be configured as software or as a combination of hardware and software. May be.

[0118]

The present invention is configured as described above, and has the following effects. That is, according to the description of the invention described in claims 1 to 3, R
Reading from the OM must always be performed via encryption.
It becomes possible to make it difficult to forge the CPU by analyzing and mimicking the CPU. Further, by verifying the authenticity of the control program, it is possible to verify the authenticity of the CPU.

According to the fourth to sixth aspects of the present invention, the encryption key itself for encryption is synthesized with the authenticity control program and encrypted, so that the CPU is analyzed and the CPU is simulated. Forgery can be made more difficult. In addition, the CPU can be verified by verifying the authenticity of the control program. In addition, claims 7 to 9
According to the description of the invention described above, it is possible to make it more difficult to analyze and mimic a CPU by synthesizing the encryption key itself for encryption with a genuine control program and encrypting it. Become. Also, it is possible to directly verify the authenticity of the CPU.

Further, according to the tenth to twelfth aspects of the invention, at the time of encryption, a random number is generated, and the generated random number is encrypted through synthesis with a genuine control program. In addition, forgery of the CPU by mimicry can be made more difficult. In addition, the CPU can be verified by verifying the authenticity of the control program.

[Brief description of the drawings]

FIG. 1 schematically shows a data flow in a gaming machine and a verification device according to a first embodiment of the present invention.

FIG. 2 schematically shows a data flow in a gaming machine and a verification device according to a second embodiment of the present invention.

FIG. 3 schematically shows a data flow in a gaming machine and a verification device according to a third embodiment of the invention.

FIG. 4 schematically illustrates encryption of program data in each embodiment of the present invention.

[Explanation of symbols]

 10 Game machine 20 CPU 25 Verification encryption means 30 ROM 40 Key reception means 45 Encryption transmission means 50 Verification device 55 Storage device 60 Verification key generation means 70 Key transmission means 75 Cryptographic reception means 80 Verification decryption means 90 Verification means 100 Database b Authentication result dx Decryption key for storage dy Decryption key for verification ex Encryption key for storage ey Encryption key for verification Fx Encryption function for storage Fx 'Decryption function for storage Fy Encryption function for verification Fy' Decryption function for verification h Game information HC Hall computer Kx key generation function for storage Ky key generation function for verification L1 synthetic data Ly cryptographic data for verification M1, M2, ..., Mx cryptographic data for storage My verification data P program data Px intermediate program data Rx storage Random number generation function Ry Random number generation function for verification Rz Random number generation function for synthesis rx Random number for storage ry Random number for verification rz Random number for synthesis Sx Authenticator synthesis function Sx 'Authenticator decomposition function Sy Game information synthesis function Sy' Function T authenticator generating function T 'authenticator verification function t authenticator x game machine model number

Claims (12)

[Claims] 1. A verification key generation step of generating a pair of a verification encryption key and a verification decryption key in a verification device, and a key transmission for transmitting the verification encryption key from the verification device to a gaming machine. And a step of verifying the control program recorded in the ROM of the gaming machine by the CPU in the gaming machine into verification encryption data encrypted by the verification encryption key received from the verification device. And a cryptographic transmission step of transmitting the cryptographic data for verification from the gaming machine to the verification device; and transmitting the cryptographic data for verification received from the gaming machine to the verification decryption key in the verification device. A verification method for a gaming machine, comprising: a decryption step for verification to be used as decryption data for verification; and a collation step of collating the decryption data for verification with predetermined collation data. 2. A CPU for controlling a game, a ROM in which a game control program is recorded, key receiving means for receiving a verification encryption key transmitted from a verification device described below, A verification encryption means for converting the control program into a verification encryption data encrypted by the verification encryption key, and a cryptographic transmission means for transmitting the verification encryption data to the following verification device. A verification key generation unit that generates a pair of a verification encryption key and a verification decryption key; a key transmission unit that transmits the verification encryption key to a key reception unit of the gaming machine; An encryption receiving unit that receives the verification encryption data transmitted from the transmission unit; a verification decryption unit that converts the verification encryption data into verification decryption data using the verification decryption key; De A gaming machine characterized in that the authenticity of a control program recorded in the ROM can be verified using a verification device having verification means for verifying data with predetermined verification data. 3. A verification key generation unit for generating a pair of a verification encryption key and a verification decryption key; a key transmission unit for transmitting the verification encryption key to the following gaming machine; An encryption receiving unit that receives the transmitted verification encryption data, a verification decryption unit that uses the verification decryption key to make the verification decryption data, and the verification decryption data, A verification device having verification means for verifying against predetermined verification data, comprising: a CPU for controlling a game; a ROM in which a game control program is recorded; and a verification code transmitted from the key transmission means. Key receiving means for receiving a key; verification encryption means for converting the control program recorded in the ROM into verification encryption data encrypted by the verification encryption key; and Said In a gaming machine having an encryption transmission means for transmitting to an encryption reception means, a verification device capable of verifying the authenticity of a control program recorded in the ROM. 4. A verification key generating step of generating a pair of a verification encryption key and a verification decryption key in the verification device, and a key transmission for transmitting the verification encryption key from the verification device to the gaming machine. And the step, by the CPU in the gaming machine, combining the control program recorded in the ROM of the gaming machine and the encryption key for verification into synthesized data, and receiving the synthesized data from the verification device. A verification encryption step of making the verification encryption data encrypted with the verification encryption key; an encryption transmission step of transmitting the verification encryption data from the gaming machine to the verification device; A verification decryption step of converting the verification encryption data received from the gaming machine into verification decryption data using the verification decryption key, and decomposing the verification decryption data into a program portion and a key portion. When, The serial program part, method of verifying the gaming machine, characterized in that it comprises a verification step of matching the predetermined reference data. 5. A CPU for controlling a game, a ROM in which a game control program is recorded, key receiving means for receiving a verification encryption key transmitted from the following verification device, and a ROM recorded in the ROM. Verifying encryption means for obtaining composite data obtained by synthesizing the control program and the verification encryption key, and converting the composite data to verification encryption data encrypted by the verification encryption key; And a cryptographic transmission means for transmitting cryptographic data for verification to the verification device described below, comprising: a verification key generation means for generating a pair of a verification encryption key and a verification decryption key; A key transmitting unit that transmits a key to a key receiving unit of the gaming machine; an encryption receiving unit that receives encryption data for verification transmitted from the encryption transmitting unit; and a decryption key for verification using the encryption data for verification. Verification decryption means for decomposing the verification decryption data into a program portion and a key portion, and verification means for verifying the program portion against predetermined verification data. A gaming machine characterized in that the authenticity of a control program recorded in the ROM can be verified using a verification device. 6. A verification key generation means for generating a pair of a verification encryption key and a verification decryption key; a key transmission means for transmitting the verification encryption key to the following gaming machine; Cipher receiving means for receiving the transmitted encryption data for verification, and the encryption data for verification, as decryption data for verification using the decryption key for verification, and the decryption data for verification with a program portion and a key portion A verification device having a decryption means for verification for decomposing the program part, and a verification means for verifying the program portion with predetermined verification data, wherein a CPU for controlling a game and a control program for the game are recorded. ROM, key receiving means for receiving the verification encryption key transmitted from the key transmission means, and synthetic data obtained by synthesizing the control program recorded in the ROM with the verification encryption key. In addition, a verification encryption unit that converts the synthesized data into verification encryption data encrypted with the verification encryption key, and an encryption transmission unit that transmits the verification encryption data to the encryption reception unit. A verification device capable of verifying the authenticity of a control program recorded in the ROM in a gaming machine having the same. 7. A verification key generation step of generating a pair of a verification encryption key and a verification decryption key in the verification device, and a key transmission for transmitting the verification encryption key from the verification device to the gaming machine. And the step, by the CPU in the gaming machine, combining the control program recorded in the ROM of the gaming machine and the encryption key for verification into synthesized data, and receiving the synthesized data from the verification device. A verification encryption step of making the verification encryption data encrypted with the verification encryption key; an encryption transmission step of transmitting the verification encryption data from the gaming machine to the verification device; A verification decryption step of converting the verification encryption data received from the gaming machine into verification decryption data using the verification decryption key, and decomposing the verification decryption data into a program portion and a key portion. When, The Kikagi portion, the verification method of a gaming machine which comprises a collating step for collating the verification encryption key. 8. A CPU for controlling a game, a ROM in which a game control program is recorded, key receiving means for receiving a verification encryption key transmitted from a verification device described below, and a ROM recorded in the ROM. Verifying encryption means for obtaining composite data obtained by synthesizing the control program and the verification encryption key, and converting the composite data to verification encryption data encrypted by the verification encryption key; And a cryptographic transmission means for transmitting cryptographic data for verification to the verification device described below, comprising: a verification key generation means for generating a pair of a verification encryption key and a verification decryption key; Key transmission means for transmitting a key to key reception means of the gaming machine; encryption reception means for receiving verification encryption data transmitted from the encryption transmission means; and a verification decryption key for the verification encryption data. A verification decryption means for decomposing the verification decryption data into a program part and a key part, and a verification means for verifying the key part with a verification encryption key. A gaming machine wherein the authenticity of the CPU can be verified using a device. 9. A verification key generation means for generating a pair of a verification encryption key and a verification decryption key; a key transmission means for transmitting the verification encryption key to the following gaming machine; Cipher receiving means for receiving the transmitted encryption data for verification, and the encryption data for verification, as decryption data for verification using the decryption key for verification, and the decryption data for verification with a program portion and a key portion A verification device comprising: a decryption means for verification for decomposing the key part; and a verification means for verifying the key portion with a cryptographic key for verification, wherein a CPU for controlling a game and a control program for the game are recorded. ROM, key receiving means for receiving the verification encryption key transmitted from the key transmission means, and synthetic data obtained by synthesizing the control program recorded in the ROM and the verification encryption key. Data for the verification encryption data encrypted with the same verification encryption key, and encryption transmission means for transmitting the verification encryption data to the encryption receiving means. A verification device capable of verifying the authenticity of the CPU. 10. A verification key generating step of generating a pair of a verification encryption key and a verification decryption key in a verification device, and a key transmission for transmitting the verification encryption key from the verification device to a gaming machine. Steps: The CPU in the gaming machine generates a combining random number, combines the control program recorded in the ROM of the gaming machine with the combining random number to generate combined data, A verification encryption step to be verification encryption data encrypted by the verification encryption key received from the verification apparatus, and an encryption transmission step of transmitting the verification encryption data from the gaming machine to the verification apparatus, In the verification device, the verification encryption data received from the gaming machine is converted into verification decryption data using the verification decryption key, and the verification decryption data is decomposed into a program portion and a random number portion. And testimony for decoding phase, the program portion, the verification method of a game machine which comprises a collating step for collating the predetermined reference data. 11. A CPU for controlling a game, a ROM in which a control program for the game is recorded, key receiving means for receiving a verification encryption key transmitted from the following verification device, and generation of a synthesis random number A verification cipher for converting the control program recorded in the ROM and the synthesizing random number into synthetic data, and using the synthesizing data as verification cryptographic data encrypted with the verification cryptographic key. And a cryptographic transmission means for transmitting the verification encryption data to the verification device described below, wherein the verification key generation means generates a pair of a verification encryption key and a verification decryption key. Key transmission means for transmitting the verification encryption key to key reception means of the gaming machine; encryption reception means for receiving the verification encryption data transmitted from the encryption transmission means; and the verification encryption data Verification decryption means for decomposing the verification decryption data into a program portion and a random number portion while using the verification decryption key as the verification decryption data; and A gaming machine characterized in that the authenticity of a control program recorded in the ROM can be verified using a verification device having a verification means for verifying the control program. 12. A verification key generation means for generating a pair of a verification encryption key and a verification decryption key, key transmission means for transmitting the verification encryption key to the following gaming machine, Cipher receiving means for receiving the transmitted cryptographic data for verification, and using the cryptographic data for verification as decryption data for verification by using the decryption key for verification, A verification device having verification decryption means for decomposing the program into parts, and verification means for verifying the program portion with predetermined verification data, wherein a CPU for controlling a game and a control program for the game are recorded. ROM, key receiving means for receiving the verification encryption key transmitted from the key transmitting means, generating a synthesis random number, and synthesizing the control program and the synthesis random number stored in the ROM. Verification encryption means for converting the synthesized data into verification encryption data encrypted with the verification encryption key, and an encryption for transmitting the verification encryption data to the encryption reception means. A verification device capable of verifying the authenticity of a control program recorded in the ROM in a gaming machine having a transmission unit.