JP3912514B2 - Communication game system, server and client - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a communication game system for playing a game via communication,Server and clientAbout.
[0002]
[Prior art]
  In a system in which a server and a plurality of clients are connected via the Internet, a technique for playing a game between the server and each client has already been put into practical use.
  In the near future, it is expected that such a system will be used for gambling.
[0003]
[Problems to be solved by the invention]
  However, in such a system for playing a game via the Internet, the player plays the game in a state where they are separated from each other. Therefore, the information transmission time is used in the process of transferring information via the Internet. There is a chance to perform fraud (cheat) by falsifying data.
  Further, when such a game is played, in the configuration in which the information management apparatus and the plurality of information processing apparatuses communicate information via a communication line, information is transmitted between the plurality of information processing apparatuses and the information management apparatus. Therefore, when information processing is performed, it is required to detect the alteration with certainty when the information is altered.
  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a communication game system that can prevent an illegal act of a player who plays a game and is advantageous when the game is played as a gamble.To provide servers and clients.
[0004]
[Means for Solving the Problems]
  In order to achieve the above object, the present invention is a communication game system in which a server and a plurality of clients are connected via a communication line, and information is exchanged between the server and each client. A server communication means for performing communication via the communication line, a game means for executing a game, and a server control means, wherein each of the clients is provided with a display means for displaying information and via the communication line. Client communication means for communicating with each other, random number generation means for generating random numbers, hash data generation means for generating hash data of the random numbers, and game data for generating game data by dividing the random numbers every predetermined number of bits A data generation unit and a client control unit, and execution of the game by the game unit of the server is performed by each client communication unit. The client communication means is configured to transmit the hash data to the server, and the server control means is the server communication means. When all the hash data is received, all the hash data is transmitted to each client communication unit, and each client control unit displays all the hash data received by the client communication unit. The game communication data is transmitted to the server by the client communication means after being displayed by the means.The game executed by the game means of the server is performed by performing an operation using all of the game data transmitted from the transmission means of each client.It is characterized by that.
[0005]
  Further, the present invention is a server connected to a plurality of clients via a communication line, the server including server communication means for performing communication via the communication line, game means for executing a game, and server Control means, and the game means is configured to play a game using game data transmitted from each client to the server communication means, and the server control means is configured such that each client uses a random number. When all of the generated hash data is received by the server communication unit, all the hash data is transmitted to each client, and the server communication unit is configured to transmit all the hash data received by each client. Is displayed, and then the game data generated by dividing the random number every predetermined number of bits is stored in the client. It is configured to receive fromThe execution of the game by the game means is performed by performing an operation using all the game data transmitted from the transmission means of each client.It is characterized by that.
[0006]
  Further, the present invention is a client connected to a server via a communication line, the client including a display means for displaying information, a client communication means for communicating via the communication line, and a random number. A random number generating means for generating, a hash data generating means for generating hash data of the random number, a game data generating means for generating game data by dividing the random number into predetermined bit numbers, and a client control means. The client communication unit is configured to transmit the hash data to the server, and the client control unit receives all the hash data from all clients connected to the server. If all the hash data is transmitted to the client communication means, the class After all of the hash data received by ant communication means is displayed by said display means, it is configured to transmit the game data to the server by the client communication meansThe game data transmitted to the server by the client communication means is a game that is executed by the game means of the server performing an operation using all of the game data.It is characterized by that.
[0007]
  Therefore, after the hash data is displayed by the display means, the game data is transmitted to the server. If there is an illegal act such as tampering with the game data, the relationship between the hash data and the game data becomes inconsistent, and an illegal act can be found.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
  Before describing embodiments of the communication game system, server, and client of the present invention, first to third reference examples will be described.
  In addition, the 1st thru | or 3rd demonstrated belowReference examples and embodimentsThen, the case where a game is performed as gambling will be described.
  FIG. 2 is a configuration diagram showing a schematic configuration of the communication game system.
  The communication game system 100 as an information processing system includes a server device 10 as an information management device, a plurality of client devices 20 (20-1 to 20-m) constituting the information processing device, the server device 10 and each client. An Internet 30 serving as a communication line connecting the apparatus 20 is provided.
  Information is exchanged between the server device 10 and each client device 20 based on a public key encryption method. That is, the server device 10 and each client device 20 constitute a public key infrastructure (PKI).
[0009]
  FIG. 1 is a block diagram showing a schematic configuration of the server device 10 and the client device 20.
  As shown in FIG. 1, the server device 10 is configured by a computer, and includes server communication means 1002, server control means 1004, display means 1006, input means 1008, game means 1010, and the like.
  The server communication unit 1002 is configured to communicate with each client device 20 via the Internet 30.
  The server control unit 1004 manages the control of each unit.
  The display unit 1006 includes a monitor device and the like, and is configured to display an image necessary for playing a game on a screen.
  The input unit 1008 includes a mouse, a keyboard, and the like, and is configured to input operations and information necessary for playing a game.
  The game means 1010 executes a game and is realized by the CPU executing game software.
  Note that the detailed processing contents of the game performed by the game means 1010 are not directly related to the gist of the present invention, so the description thereof will be omitted, and the necessary processing contents will be briefly described in the operation description to be described later.
  In addition, the server device 10 is configured to cause each of the units to function when the CPU executes a server program installed in a hard disk device that is a storage unit provided in the computer.
  The installation of the server program in the server device 10 may be performed by downloading via the Internet, or the server program recorded on a recording medium such as a CD-ROM may be downloaded via the CD-ROM drive device. It may be performed by reading.
  The server program may be preinstalled in the server device 10.
  Needless to say, each of the units constituting the server device 10 may be realized by hardware.
[0010]
  The client device 20 is configured to be connectable to a personal authentication device 22 described later..
  in frontThe client device 20 is configured by a computer and includes client communication means 2002, client control means 2004, display means 2006, and input means 2008.
  The client communication unit 2002 is configured to communicate with the server device 10 via the Internet 30.
  The client control unit 2004 controls the respective units.
  The display means 2006 is composed of a monitor device or the like, and is configured to display an image necessary for playing a game on the screen.
  The input unit 2008 includes a mouse, a keyboard, and the like, and is configured to input operations and information necessary for playing a game.
  The client device 20 is configured to operate when the CPU executes a client program installed in a hard disk device that is storage means provided in the computer.
  The installation of the client program on the client device 20 may be performed by downloading via the Internet, or the client program recorded on a recording medium such as a CD-ROM may be downloaded via the CD-ROM drive device. It may be performed by reading.
  The server program may be preinstalled in the client device 20.
  Of course, each of the means constituting the client device 20 may be realized by hardware.
[0011]
  The client device 20 is provided with a personal authentication device 22 so as to be connectable.
  The personal authentication device 22 authenticates that the player who operates each client device 20 is a person registered in advance. Player personal authentication is necessary to prevent minors from gambling.
  As shown in FIG. 3, the personal authentication device 20 is provided with a fingerprint collation sensor 2202 at a location facing the outside of the casing 2001, and is configured to be able to exchange information with the client device 20 via a cable 2203. Has been. The exchange of information is performed based on the USB standard, for example.
[0012]
  As shown in FIG. 4, in addition to the fingerprint verification sensor 2202, the personal authentication device 22 includes an A / D converter 2204, a fingerprint verification LSI 2206, a PKI engine 2208 (game data generation means), a flash memory 2210, a program ROM and RAM 2212, CPU 2214, USB controller 2216, and the like.
  The fingerprint verification LSI 2206, PKI engine 2208, flash memory 2210, program ROM and RAM 2212, CPU 2214, and USB controller 2216 are commonly connected by a bus.
  The fingerprint collation sensor 2202 reads a fingerprint from a fingertip placed on the fingerprint collation sensor 2202 and outputs fingerprint data (grayscale data).
  The A / D converter 2204 converts the fingerprint data from an analog signal to a digital signal.
  The fingerprint collating LSI 2206 generates template data of a characteristic portion from the digital data and stores it in the flash memory 2210.
  The PKI engine 2208 generates a public key and a secret key necessary for communication based on the public key encryption method, and performs encryption / decryption based on the public key and the secret key. The generation of the public key and secret key will be described later.
  The flash memory 2210 is configured to store the template data and chip data given to the player in exchange for a wager.
  The program ROM and RAM 2212 store a control program for the personal authentication device 20.
  The USB controller 2216 is an interface for transmitting / receiving information to / from the client device 20.
  The CPU 2214 controls the units based on the control program.
[0013]
  Next, the operation of the personal authentication device 22 will be described.
  First, a registration operation for registering a player using the client device 20 will be described.
  The player places a finger on the fingerprint collation sensor 2202 of the personal authentication device 22. As a result, fingerprint data is read by the fingerprint verification LSI 2206 via the A / D converter 2204, and the template data is stored in the flash memory 2210. Thereby, the fingerprint data of the player is registered.
  Next, an authentication operation for authenticating the player will be described.
  The player places a finger on the fingerprint collation sensor 2202 of the personal authentication device 22. As a result, fingerprint data is read by the fingerprint verification LSI 2206 via the A / D converter 2204 and verified with the template data stored in the flash memory 2210. The result is notified to the CPU 2214.
  The CPU 2214 notifies the client device 20 that the authentication has been normally performed if the collation result is acceptable. Thereby, the client device 20 can be used. On the other hand, if the verification result is unsuccessful, the client device 20 is notified that the authentication has not been performed. As a result, the client device 20 cannot be used.
[0014]
  Next, the operation of generating a public key and a secret key based on the RAS scheme by the PKI engine 2208 will be described.
  A command instructing generation of a public key and a secret key is transmitted from the client device 20 to the personal authentication device 22.
  The PKI engine 2208 generates a random number in response to the command. The generation of the random number is repeated until a non-prime number is obtained.
  When a non-prime random number is obtained, the PKI engine 2208 converts this random number into a composite number as shown in Equation (1).n andAnd two primes indicating the composite number n as the productnumber,That is, it is decomposed into a first prime number p and a second prime number q. The composite number n is also called modulus. In other words, the composite number n is irreversibly and uniquely generated based on the first prime number p and the second prime number q.
  n = p · q (1)
  Next, y is obtained based on the equation (2).
  (P-1). (Q-1) + 1 = y (2)
  Next, a public key e and a secret key d, which show y as a product, are obtained based on the equation (3).
  e ・ d = y (3)
  For example, if the composite number n = 33, the formulas (1), (2), and (3) are as follows.
  33 = 3.11 (1)
  (3-1) · (11-1) + 1 = 21 (2)
  3 · 7 = 21 (3)
  That is,
  Number of synthesis n: 33
  Public key e: 3
  Private key d: 7
  It becomes.
[0015]
  Next, the operation at the time of playing the game will be described with reference to the flowchart of FIG. The firstReference exampleNow, a case where the game is craps will be described.
  A player who plays a game includes one parent player who plays a role in controlling the progress of the game, and one or more child players who participate in the game according to the progress of the parent player.
  BookReference exampleIn the following description, it is assumed that the parent player operates the server device 10 via the client device 10 and the child player operates the client device 20.
[0016]
  First, each child player goes to a registration place of a service provider that provides gambling, performs his / her age verification, registers fingerprint data in the personal authentication device 22 and performs personal registration (step S10). Next, each child player pays a wager to have the chip data corresponding to the wager stored in the flash memory 2210 (step S12).
  The chip data is digitally signed by the service provider.
  Thereafter, the personal authentication device 22 is lent to each child player (step S14).
  Each child player connects the lent personal authentication device 22 to the client device 20 and performs a personal authentication operation (step S16). When the personal authentication operation is normally performed, preparation for participating in the game is completed.
[0017]
  When the game participation preparation is completed, as shown in FIG. 6, a menu G1 for selecting a game is displayed on the screen of the display means 2006 of the client device 20 (step S18).
  By selecting craps and pressing an execution key on the keyboard of the input unit 2008 of the client device 20, a screen for performing craps is displayed as shown in FIG. 7 (step S20).
  On the screen, an image G2 of a table for performing craps (detailed screen contents are omitted) is displayed, and the composite number n (from the client devices 20 of all child players participating in the game) n1-nx), the first prime number p (p1-px), and the second prime number q (q1-qx) are displayed.
  Also, a dice button B1 for dicing, an n transmission button B2 for transmitting the composite number n, a p transmission button B3 for transmitting the first prime number p, and a q transmission button for transmitting the second prime number q B4 is also displayed.
  These buttons are set in an inoperable state in the initial state. Each button is displayed in a different color depending on whether or not operation is possible (ready state), for example, green when operation is possible and red when operation is not possible. It is configured to be.
[0018]
  The child player bets chips while watching the image on the table (step S22). That is, by operating the mouse of the input unit 2008, the image chip is dragged and dropped to a desired location on the image table. This image is displayed on the monitor device of each client in real time. The betting of the chip means that betting data corresponding to the betting amount is bitted, that is, presented to the server device 10 by each client device 20.
  Note that an operation such as placing such a chip on the table and a display corresponding to the operation are performed between the server device 10 and each client device 20 under the control of the game unit 1010 and the server control unit 1004 of the server device 10. This is realized by communicating information with each other via the Internet 30.
[0019]
  When all of the child players have bet chips, the parent player performs an operation on the input unit 1008 of the client device 20 of the parent player to make all of the client devices 20 of the child player into the die ready state. This operation information is transmitted to the server device 10 via the Internet 30, and the server control unit 1004 that recognizes the operation information instructs the server communication unit 1002 from the server control unit 1004 to enter the die ready state. The client control unit 1004 of each client device 20 changes the color of the dice button B1 of the display unit 2006 from red indicating inoperability to green indicating possible (step). S24).
  In response to this, when each child player clicks the dice button B1, the client control unit 2004 of each client device 20 instructs the personal authentication device 22 to generate a public key and a secret key (step S26).
  The personal authentication device 22 generates the composite number n, the first prime number p, and the second prime number q in accordance with the above-described operation, and gives them to the client control unit 2004 (step S2).8).
  The client control unit 2004 first makes the n send button B2 operable. For example, the color of this button is changed from red to green (step S30).
  When each child player operates the n transmission button B2, and all the composite numbers n are transmitted to the server device 10, the game means 1010 of the server device 10 sets all the composite numbers n to each client device. 20 to send. As a result, all the composite numbers n are displayed on the display means 2006 of each client device 20 (step S3).2).
  Therefore, each child player can visually recognize his / her composite number n and the composite number n of other child players.
[0020]
  Next, after all the composite numbers n are transmitted to each client device 20, the game means 1010 of the server device 10 can operate buttons for transmitting the first prime number p and the second prime number q. An instruction to do so is transmitted to each client device 20.
Accordingly, the client control unit 2004 puts the p transmission button B3 and the q transmission button B4 into an operable state. For example, the color of these buttons B3 and B4 is changed from red to green (step S34).
  When each child player operates both the p transmission button B3 and the q transmission button B4, the first prime number p and the second prime number q in all the client apparatuses 20 are transmitted to the server apparatus 10 as game data (step). S36).
  Next, the game means 1010 of the server device 10 transmits all the first prime numbers p and second prime numbers q to each client device 20. As a result, all the first prime numbers p and second prime numbers q are displayed on the display means 2006 of each client device 20 (step S3).8).
  Therefore, each child player can visually recognize his / her first prime number p and second prime number q and the first prime number p and second prime number q of other child players.
  In step S38, each client control unit 2004 determines that all the composite numbers n received by the client communication unit 2002 and all the first and second prime numbers p, q received by the client communication unit 2002 are obtained. Are verified, that is, compared to determine whether or not the first and second prime numbers p and q are falsified (step S39). If it is determined that there is no falsification based on the confirmation result, the process proceeds to the next step. If falsification is found, the fact is notified to the server device 10, and the server device 10 instructs each client device 20 to stop the game. (Step S41).
[0021]
  Then, the game means 1010 of the server device 10 determines two dice eyes (any number from 1 to 6) based on the received prime numbers..
  That is, it is assumed that the first prime number p received by the game means 1010 of the server device 10 is p1 to px, and the second prime number is q1 to qx.
  First, a predetermined bit is deleted from the LSB (least significant bit) side of the first and second prime numbers. This is because the prime number is always composed of an odd number.
  Next, an exclusive OR p0 of each first prime number p1 to px (after deletion of a predetermined bit) is calculated as in Expression (4).
  p0 = p1 * p2 * p3 * ...... * px (4)
(In this specification, * indicates an operation symbol of exclusive OR)
  Next, p0 is divided by 6, and the remainder is used as the first die eye (however, the remainder 0 is the die eye 6).
  Then, the game means 1010 of the server device 10 transmits the first dice eye data to each client device 20 to display the first dice eye on the display means 2006 of each client device 20 ( Step S40).
[0022]
  Similarly, an exclusive OR q0 of each second prime number q1 to qx (after deletion of a predetermined bit) is calculated as in Expression (5).
  q0 = q1 * q2 * q3 * ...... * qx (5)
  Next, divide q0 by 6 to make the remainder of the second die eye (however, the remainder of 0 makes the die eye 6).
  Then, the game means 1010 of the server device 10 transmits the second die eye data to each client device 20 to display the second die eye on the display means 2006 of each client device 20 ( Step S42).
[0023]
  When the eyes of the two dice are determined in this manner and the winning / losing of craps is determined (“Y” in step S44), processing such as a payout of a wager is executed (step S46).
  If the winning / losing of craps is not determined ("N" in step S44), the process returns to step S34.
  It is selected whether or not to continue the game (step S48). If the game is to be continued ("Y" in step S48), the process proceeds to step S22, and if not continued ("N" in step S48), the process is terminated. .
[0024]
  As explained above, the firstReference exampleAccording to the above, after the composite number n is displayed by the display means 2006 of each client device 20, both the first and second prime numbers p and q are transmitted to the server device 10 as the game data. . If there is an illegal act such as tampering with the first and second prime numbers p and q, the relationship between the composite number n and the first and second prime numbers p and q is inconsistent, that is, n = p Q becomes unsatisfied, which makes it possible to detect fraud.
[0025]
  In addition, since all of the first prime number p and the second prime number q generated by the personal authentication device 22 of each client device 20 in the process of calculating the dice roll are used, it is fair to each player. Can keep sex.
  Further, by authenticating the player using the personal authentication device 22, it is possible to easily limit the player who performs gambling (age limitation).
[0026]
  In the operations of steps S40 and S42, it is preferable to display an image showing how the dice rolls on the display means 2006 of each client device 20 in order to improve the visual effect.
  The firstReference exampleThen, the first and second prime numbers p and q based on the composite number n are generated by the PKI engine 2208, but this operation may be performed by the CPU 2214 or the client control unit 2004. Absent.
  In the above description, all of the first and second prime numbers p and q are used. However, the dice roll may be determined by 8 bits from these most significant bits. By doing in this way, there exists an advantage which can obtain the eyes of the dice | dies by having rolled the dice several times only by producing | generating the synthetic | combination number n once.
[0027]
  next,Second reference exampleWill be described.
  SecondReference exampleNow, description will be made assuming that the game is roulette.
  SecondReference exampleIs the firstReference exampleThe difference from the above is the contents of the operation for determining the eyes appearing in roulette using the screen displayed on the display means 2006 of each client device 20 and the first and second prime numbers p and q.
  FIG. 8 is an explanatory diagram of a screen displayed on the display unit 2006 of the client device 20 when the roulette is selected.
  As shown in FIG. 8, on the screen of the display means 2006, an image of a table for roulette is displayed, and the composite number n transmitted from the client devices 20 of all the child players participating in the game. (N1 to nx), the first prime number p (p1 to px), and the second prime number q (q1 to qx) are displayed.
  Also, a ready button B11 operated by each child player, an n transmission button B2 for transmitting the composite number n, a p transmission button B3 for transmitting the first prime number p, and a q transmission for transmitting the second prime number q. Button B4 is also displayed.
  These buttons are set in an inoperable state in the initial state. Each button is displayed in a different color depending on whether or not operation is possible (ready state), for example, green when operation is possible and red when operation is not possible. It is configured to be.
[0028]
  FIG. 9 shows the secondReference exampleIt is a flowchart which shows this operation | movement.
  In FIG. 9, steps having the same operations as those in FIG. 5 are denoted by the same step numbers and description thereof is omitted.
  Steps S10 to S18 are the firstReference exampleIt is the same.
  By selecting a roulette in step S20, a roulette screen G3 (detailed screen content is omitted) shown in FIG. 8 is displayed.
  The child player bets chips while watching the image on the table (step S22). That is, by operating the mouse of the input unit 2008, the image chip is dragged and dropped to a desired location on the image table. This image is displayed on the monitor device of each client in real time. BookReference exampleThe betting of the chip means that betting data corresponding to the betting amount is bitted to the server device 10 by each client device 20, that is, presented.
[0029]
  When all of the child players have bet chips, the parent player performs an operation on the input means 1008 of the client device 20 of the parent player to make all the ready buttons B11 of the client device 20 of the child player ready. This operation information is transmitted to the server device 10 via the Internet 30, and the server control unit 1004 that has recognized the operation information instructs the server control unit 1004 to set the ready button B11 in the ready state. The client control means 1004 of each client apparatus 20 changes the color of the ready button B11 of the display means 2006 from red indicating inoperability to green indicating possible (step). S124).
  In response to this, when each child player clicks the ready button B11, the client control means 2004 of each client device 20 instructs the personal authentication device 22 to generate a public key and a secret key (step S126).
  Hereinafter, the operations of generating and displaying the composite number n, the first prime number p, and the second prime number q by the personal authentication device 22 are the same as steps S28 to S41 in FIG.
[0030]
  The calculation for determining the roulette eye is performed in the following procedure.
  That is, it is assumed that the first prime number p received by the game means 1010 of the server device 10 is p1 to px and the second prime number is q1 to qx.
  Next, an exclusive logical sum pq0 of the first prime numbers p1 to px and the second prime numbers q1 to qx is calculated as in Expression (6).
  pq0 = p1 * p2 * p3 * …… * px
          * Q1 * q2 * q3 * …… * qx (6)
  Next, pq0 is divided by 38 and the remainder (1 to 36) is used as roulette eyes (synthesis information generation step). However, the remainder is 0 for the roulette eye and the remainder 37 is the roulette eye for 00..
  Then, the game means 1010 of the server device 10 displays roulette eyes on the display means 2006 of each client device 20 by transmitting roulette data to each client device 20 (step S140).
[0031]
  When the roulette eyes are determined in this way and the roulette wins or loses are determined ("Y" in step S142), processing such as payout of a wager is executed (step S144).
  Next, it is selected whether or not to continue the game (step S146). If the game is to be continued ("Y" in step S46), the process proceeds to step S22, and if not continued ("N" in step S46). finish.
[0032]
  As explained above, the secondReference exampleAccording to the above, after the composite number n is displayed by the display means 2006 of each client device 20, both the first and second prime numbers p and q are transmitted to the server device 10 as the game data. . If there is an illegal act such as tampering with the first and second prime numbers p and q, the relationship between the composite number n and the first and second prime numbers p and q is inconsistent, that is, n = p Q becomes unsatisfied, which makes it possible to detect fraud.
[0033]
  Further, since all of the first prime number p and the second prime number q generated by the personal authentication device 22 of each client device 20 in the process of determining the roulette eye are used, it is fair to each player. Can keep sex.
  In addition, firstly, by performing player authentication using the personal authentication device 22, it is possible to easily limit the player who performs gambling (age limitation).Reference exampleIt is the same.
[0034]
  In the operation of step S140, it is preferable to display an image showing the roulette rotating on the display unit 2006 of each client device 20 in order to improve the visual effect.
  In the above description, all of the first and second prime numbers p and q are used. However, the roulette eye may be determined by 8 bits from these most significant bits. By doing in this way, there exists an advantage which can obtain the roulette eyes for the part which rotated the roulette several times only by producing | generating the synthetic | combination number n once.
[0035]
  next,Third reference exampleWill be described.
  ThirdReference exampleNow, description will be made assuming that the game is blackjack, which is one of card games.
  ThirdReference exampleIs the firstReference exampleThe difference from the above is the calculation content for determining the card number using the screen displayed on the display means 2006 of each client device 20 and the first and second prime numbers p and q.
  FIG. 10 is an explanatory diagram of a screen displayed on the display unit 2006 of the client device 20 when blackjack is selected.
  As shown in FIG. 10, on the screen of the display means 2006, an image of a table for performing blackjack is displayed, and the composite number transmitted from the client devices 20 of all the child players participating in the game. n (n1 to nx), the first prime number p (p1 to px), and the second prime number q (q1 to qx) are displayed.
  Also, a start button B21 operated by each child player, an n transmission button B2 for transmitting the composite number n, a p transmission button B3 for transmitting the first prime number p, and a q transmission for transmitting the second prime number q. Button B4 is also displayed.
  These buttons are set in an inoperable state in the initial state. Each button is displayed in a different color depending on whether or not operation is possible (ready state), for example, green when operation is possible and red when operation is not possible. It is configured to be.
[0036]
  FIG. 11 shows the thirdReference exampleIt is a flowchart which shows this operation | movement.
  In FIG. 11, steps having the same operations as those in FIG. 5 are denoted by the same step numbers and description thereof is omitted.
  Steps S10 to S18 are the firstReference exampleIt is the same.
  By selecting blackjack in step S20, a blackjack screen G4 (detailed screen content is omitted) shown in FIG. 10 is displayed.
  The child player bets chips while watching the image on the table (step S22). That is, by operating the mouse of the input unit 2008, the image chip is dragged and dropped to a desired location on the image table. This image is displayed on the monitor device of each client in real time. The betting of the chip means that betting data corresponding to the betting amount is bitted, that is, presented to the server device 10 by each client device 20.
[0037]
  When all of the child players have bet chips, the parent player performs an operation on the input unit 1008 of the client device 20 of the parent player to make all the start buttons B21 of the client device 20 of the child player ready. . This operation information is transmitted to the server device 10 via the Internet 30, and the server control means 1004 that has recognized the operation information instructs the start button B21 to be ready.ButIt is transmitted from the server control means 1004 to each client device 20 of the child player via the server communication means 1002, and the client control means 1004 of each client device 20 indicates that the color of the start button B21 of the display means 2006 cannot be operated. The color is changed from red to green indicating possible (step S224).
  In response to this, when each child player clicks the ready button B11, the client control unit 2004 of each client device 20 instructs the personal authentication device 22 to generate a public key and a secret key (step S226).
  Hereinafter, the generation of the composite number n, the first prime number p, the second prime number q and the operation of displaying the composite number n by the personal authentication device 22 are the same as steps S28 to S32 in FIG. In this example, the number of digits of the first prime number p and the second prime number q is assumed to be 512 bits.
[0038]
  Next, after all the composite numbers n are transmitted to each client device 20, the game means 1010 of the server device 10 can operate buttons for transmitting the first prime number p and the second prime number q. An instruction to do so is transmitted to each client device 20.
  Accordingly, the client control unit 2004 puts the p transmission button B3 and the q transmission button B4 into an operable state. For example, the color of these buttons B3 and B4 is changed from red to green (step S234).
  When each child player operates both the p transmission button B3 and the q transmission button B4, the first prime number p and the second prime number q in all the client devices 20 are transmitted to the server device 10 (step S236).
  In this example, four sets of cards are used. Therefore, the total number of cards is 52 × 4 = 208, and it is sufficient that the number necessary for identifying the pattern and number of each card is 208 or more. For this reason, the number of bits of the first prime number p and the second prime number q necessary for one play is 8 bits (a number from 0 to 255 in decimal number).
  Accordingly, the first and second prime numbers p and q are transmitted 8 bits from the most significant bit every time one card is determined (for each play).
  The first and second prime numbers p and q need not use the least significant bit (LSB). The reason for this is that the generated 512-bit first and second prime numbers p and q are odd numbers, and the least significant bit (LSB) is always 1. Therefore, if transmission is performed including the least significant bit, it will be described later. This is to avoid the disadvantage that the calculation result for determining the number of cards to be played is determined according to the number of child players.
  The processing method of excluding the predetermined bits from the least significant bit side of the first and second prime numbers p and q is arbitrary. For example, of the 512 bits constituting the first and second prime numbers p and q, the lower bit half is calculated. May be omitted.
[0039]
  Next, the game means 1010 of the server device 10 transmits the first prime number p and the second prime number q for 8 bits to each client device 20. Thereby, all the first prime numbers p and second prime numbers q are displayed on the display means 2006 of each client device 20 (step S238).
  Therefore, each child player can visually recognize his / her first prime number p and second prime number q and the first prime number p and second prime number q of other child players.
  In step S238, each client control unit 2004 determines that all the composite numbers n received by the client communication unit 2002 and all the first and second prime numbers p, q received by the client communication unit 2002 are obtained. Are compared, that is, compared to determine whether the first and second prime numbers p and q have been tampered with (step S239). If it is determined that there is no falsification based on the confirmation result, the process proceeds to the next step. If falsification is found, the fact is notified to the server device 10, and the server device 10 instructs each client device 20 to stop the game. (Step S241).
[0040]
  And the game means 1010 of the said server apparatus 10 determines the number of a card | curd based on these received prime numbers..
  The calculation for determining the card number is performed in the following procedure.
  That is, it is assumed that the first prime number p received by the game means 1010 of the server device 10 is p1 to px and the second prime number is q1 to qx.
  As in Expression (7), the exclusive OR p0 of the first prime numbers p1 to px (after deletion of predetermined bits) is calculated.
  p0 = p1 * p2 * p3 * ...... * px (7)
  Next, p0 is divided by 208, and the number or pattern of cards is specified by the remainder.
  Similarly, an exclusive OR q0 of each second prime number q1 to qx (after deletion of a predetermined bit) is calculated as in Expression (8).
  q0 = q1 * q2 * q3 * ...... * qx (8)
  Next, q0 is divided by 208, and the number or pattern of cards is specified by the remainder.
  Accordingly, the parent player distributes a predetermined number of cards specified by the numbers of the exclusive ORs p0 and q0 to each operator (client device 20) based on the blackjack rule. Since this rule itself is not directly related to the gist of the present invention, description thereof is omitted.
  That is, data corresponding to the card numbers and pictures is transmitted from the game means 1010 of the server device 10 to each client device 20. Based on the data, a card image (including a pattern and a number) distributed to the display unit 2006 of each client device 20 is displayed (step S240).
[0041]
  Thus, by determining the picture and number of the card, if the winning or losing of the blackjack is determined (“Y” in step S242), processing such as payout of a wager is executed (step S244).
  If the winning / losing of the blackjack is not determined (“N” in step S242), the process returns to step S234.
  It is selected whether or not to continue the game (step S246). If the game is to be continued ("Y" in step S246), the process proceeds to step S22, and if not continued ("N" in step S246), the process is terminated. .
[0042]
  As explained above, the thirdReference exampleAccording to the above, after the composite number n is displayed by the display means 2006 of each client device 20, both the first and second prime numbers p and q are transmitted to the server device 10 as the game data. . If there is an illegal act such as tampering with the first and second prime numbers p and q, the relationship between the composite number n and the first and second prime numbers p and q is inconsistent, that is, n = p Q becomes unsatisfied, which makes it possible to detect fraud.
[0043]
  In addition, since all of the first prime number p and the second prime number q generated by the personal authentication device 22 of each client device 20 in the process of calculation for determining the picture and number of the card are used, each child player It is possible to maintain fairness.
  In addition, the authentication of the child player using the personal authentication device 22 makes it possible to easily limit the child player who performs gambling (age restriction).Reference exampleIt is the same.
[0044]
  In the operation of step S240, it is preferable to display an image indicating that the card is shuffled on the display unit 2006 of each client device 20 in order to improve the visual effect.
[0045]
  In addition,First to third reference examplesIs not limited to craps, roulette, or blackjack. For example, it can be applied to poker using a card.
  Also,First to third reference examplesIs not limited to games using dice or cards, but can be applied to any game that can use the first and second prime numbers p and q as game data.
  Further, the longer the bit length of the first and second prime numbers p and q, the more difficult it is to calculate the first and second prime numbers from the composite number n, which is advantageous in preventing fraud. It is. For example, if the bit length is set to 500 bits or more, it can be said that the first and second prime numbers cannot be practically decoded.
  The communication line connecting the server apparatus 10 and the client apparatus 20 is preferable because encrypted communication is ensured by using a VPN (Virtual Private Network). Moreover, it is arbitrary to use a communication line other than the Internet as the communication line.
[0046]
  In addition,First to third reference examplesIn the game described in the above, the parent player is solely responsible for the progress of the game and cannot bet his / her own bet, but the parent player can bet the bet as well as the child player. In a nasty gameSameOf course, it can be applied in the same manner.
[0047]
  Further, when each client device 10 transmits the composite number to the server device 10, if the digital signature with the time stamp of each player is performed on the composite number, the transmission source of the composite number, It becomes possible to specify the transmission date and time.
  In this case, it is possible to prevent denying that the composite number has been transmitted, or to forge the transmission date and time of the transmitted composite number, which is advantageous in suppressing fraud.
  Further, when each client device 10 transmits the bet data to the server device 10, a digital signature of each player is given to the bet data, and the bet data is time-stamped by the server device. If configured, it becomes possible to specify the transmission source and the transmission date and time of the betting data.
  In this case, it is possible to prevent denying the fact that the betting data has been transmitted or to forge the transmission date and time of the transmitted betting data, which is advantageous in suppressing fraud.
[0048]
  next,Of the present inventionEmbodiments will be described.
  BookThe first to third embodimentsReference exampleThis is different from the generation operation of game data.
  First to third reference examplesSimilarly, a command instructing generation of a public key and a secret key is transmitted from the client device 20 to the personal authentication device 22.
  The PKI engine 2208 (game data generating means) generates an n-bit random number in response to the command.MGenerate.BookIn the embodiment, the random number M may be a prime number or a non-prime number.
  M = a₁a₂a₃a₄a₅a₆a₇a₈...... a_n                (9)
  (A₁Thru a_nIndicates each bit)
  When the random number M is obtained, the PKI engine 2208 inputs the random number M into a hash function as shown in the equation (10) to obtain hash data.HAsk.
  H = Hash (M) (10)
  The hash data H cannot be obtained by back-calculating the random number M from the data, and is composed of numbers having a smaller number of bits than the number of bits of the random number M. In other words, the hash data H is irreversibly and uniquely generated based on the random number M.
  A digital signature with a time stamp of each player is made to the hash data H.
[0049]
  Next, a crap game using the game data generation method as described above will be described with reference to the flowchart of FIG. In FIG. 12, the same steps as those in the flowchart of FIG. 5 are denoted by the same step numbers and the description thereof is omitted.
  In addition,BookThe configuration of the communication game system in the embodiment is the firstReference exampleTherefore, the following operation will be described with reference to FIGS.In the present embodiment, the client device 20 and the personal authentication device 22 constitute the client and the information processing device of the present invention.
[0050]
  First, steps S10 to S18 are the same as those in the flowchart of FIG.
  As shown in FIG. 13, in step S20, an image G2 of a table for craps (detailed screen content is omitted) is displayed on the screen, and clients of all child players participating in the game are displayed. The hash data H (H1 to Hx) transmitted from the device 20, game data m1 (m1 (1) to m1 (x)), and game data m2 (m2 (1) to m2 (x)) are displayed. It has become.
  Also displayed are a dice button B1 for shaking dice, an H transmission button B21 for transmitting hash data H, and m1, m2 transmission buttons B31, B41 for transmitting game data m1, m2.
  These buttons are set in an inoperable state in the initial state. Each button is displayed in a different color depending on whether or not operation is possible (ready state), for example, green when operation is possible and red when operation is not possible. It is configured to be.
  Steps S22 and S24 are the first stepsReference exampleIs the same operation.
[0051]
  When the dice button is operated in step S26, the client control means 22 of the client device 20 generates a random number M according to the above-described operation (step S282: seed information generation step), and generates hash data H of the random number M. (Step S284: Authentication information generation step).
  Further, the random number M is divided by a predetermined number of bits (for example, 8 bits) to generate game data m (m1, m2, m3,...) (Step S286)..
  As previously mentioned,
  M = a₁a₂a₃a₄a₅a₆a₇a₈...... a_n            (9)
Then, m1, m2, and m3 are expressed as the following formulas (11), (12), (13),.
  m1 = a₁a₂a₃a₄a₅a₆a₇a₈                (11)
  m2 = a₉a₁₀a₁₁a₁₂a₁₃a₁₄a₁₅            (12)
  m3 = a₁₆a₁₇a₁₈a₁₉a₂₀a₂₁a₂₂a₂₃      (13)
[0052]
  The client control unit 2004 first sets the H transmission button B21 to an operable state. For example, the button color is changed from red to green (step S302).
  When each child player operates the H transmission button B2 to transmit all hash data H to the server device 10, the game means 1010 of the server device 10 sends the hash data H to each client device 20. Send. Thereby, all the hash data H are displayed on the display means 2006 of each client device 20 (step S322: authentication information transmission step, authentication information reception step).
  Therefore, each child player can view his / her own hash data H and the hash data H of other child players.
[0053]
  Next, after all the hash data H is transmitted to each client device 20, the game means 1010 of the server device 10 sets the buttons for transmitting the game data m1 and m2 to an operable state. Is transmitted to each client device 20.
As a result, the client control unit 2004 makes the m1 and m2 transmission buttons B31 and B41 operable. For example, the color of the m1, m2 transmission buttons B31, B41 is changed from red to green (step S342).
  When each child player operates both the m1 transmission button B31 and the m2 transmission button B41, the game data m1 (1) to m1 (x) and m2 (1) to m2 in all the client devices 20 are stored in the server device 10. (X) is transmitted (step S362).
  Next, the game means 1010 of the server device 10 transmits game data m1 (1) to m1 (x) and m2 (1) to m2 (x) in all the client devices 20 to each client device 20. Thereby, the game data in all the client devices 20 is displayed on the display means 2006 of each client device 20 (step S382: seed information transmission step).
  Accordingly, each child player can visually recognize his / her game data m1 and m2 and the game data m1 and m2 of other child players.
  In step S382, each client control unit 2004 verifies all the hash data H received by the client communication unit 2002 and all game data m1 and m2 received by the client communication unit 2002. That is, it is determined whether or not the game data m1 and m2 have been falsified (step S384). If it is determined that there is no falsification based on the confirmation result, the process proceeds to the next step. If falsification is found, the fact is notified to the server device 10, and the server device 10 instructs each client device 20 to stop the game. (Step S386).
[0054]
  Then, the game means 1010 of the server device 10 determines two dice eyes (any number from 1 to 6) based on the received game data..
  YouThat is, it is assumed that the game data m1 received by the game means 1010 of the server device 10 is m1 (1) to m1 (x).
  Next, an exclusive OR m1 (0) of each game data m1 is calculated as in Expression (14).
  m1 (0) = m1 (1) * m1 (2) * m1 (3) * ……
              * M1 (x) (14)
  Next, divide m1 (0) by 6 to make the remainder of the first die (note that the remainder 0 is the die eye 6).
  Then, the game means 1010 of the server device 10 transmits the first dice eye data to each client device 20 to display the first dice eye on the display means 2006 of each client device 20 ( Step S40).
[0055]
  Similarly, an exclusive logical sum m2 (0) of each game data m2 (1) to m2 (x) (after deletion of a predetermined bit) is calculated as in Expression (5).
  m2 (0) = m2 (1) * m2 (2) * m2 (3) * ……
              * M2 (x) (15)
  Next, m2 (0) is divided by 6 to make the remainder of the second die eye (however, the remainder 0 is the die eye 6).
  Then, the game means 1010 of the server device 10 transmits the second die eye data to each client device 20 to display the second die eye on the display means 2006 of each client device 20 ( Step S42).
[0056]
  When the two dice rolls are determined in this manner and the winning / losing of craps is determined (“Y” in step S44), processing such as a payout of bet is executed (step S46).
  If the winning / losing of craps is not determined ("N" in step S44), the process returns to step S342.
  It is selected whether or not to continue the game (step S48). If the game is to be continued ("Y" in step S48), the process proceeds to step S22, and if not continued ("N" in step S48), the process is terminated. .
[0057]
  As explained above,BookAccording to the embodiment, after the hash data H is displayed by the display means 2006 of each client device 20, both the game data m1 and m2 are transmitted to the server device 10 as the game data. . If there is an illegal act such as falsification with respect to the game data m1 and m2, the relationship between the hash data H and the game data m1 and m2 becomes contradictory, and it becomes possible to find an illegal act.
  Also,BookIn the embodiment, the first to thirdReference exampleCompared to the above, since it is not necessary to select a prime number when generating game data from the random number M, the time required for this process can be shortened, which is advantageous in speeding up the process.
  Also,BookAlso in the embodiment, the longer the bit length of the random number M, the more difficult it is to calculate the game data from the hash data or the like. If the bit length is 500 bits or more, the game data is practically reduced. It can be said that it is impossible to calculate.
[0058]
  Further, as described above, a digital signature with a time stamp is made on the hash data H, whereby the transmission source and the transmission date and time of the hash data H can be specified.
  Therefore, it is possible to prevent denying the fact that a certain hash data H has been transmitted or to forge the transmission date and time of the transmitted hash data H, which is advantageous in suppressing fraud.
  Also,BookAlso in the embodiment, when each client device 10 transmits the bet data to the server device 10, each player device performs a digital signature of each player on the bet data, and the server device attaches a time stamp to the bet data. If configured so, it becomes possible to specify the transmission source and the transmission date and time of the betting data.
  In this case, it is possible to prevent denying the fact that the betting data has been transmitted or to forge the transmission date and time of the transmitted betting data, which is advantageous in suppressing fraud.
[0059]
  In addition, since all of the game data m1 and m2 generated by the personal authentication device 22 of each client device 20 is used in the process of calculating the dice roll, fairness is maintained for each player. be able to.
  Further, by authenticating the player using the personal authentication device 22, it is possible to easily limit the player who performs gambling (age limitation).
[0060]
  In the operations of steps S40 and S42, it is preferable to display an image showing how the dice rolls on the display means 2006 of each client device 20 in order to improve the visual effect.
[0061]
  In this example, the first two pieces of data are generated as game data m1 and m2 from the most significant bit of the random number M every predetermined bit, and these are used as data for one game. .
  However, by generating the data m3, m4,... Following the m1, m2 by dividing the most significant bit of the random number M into predetermined bits, the data after the m3 is converted into the second and subsequent games, that is, 2 It may be used as a die roll in the game after the first round.
[0062]
  Also,BookIn the embodiment, the case where the present invention is applied to craps, which is a game with dice eyes 1 to 6, has been described. By changing the range of numerical values necessary for game data, the second and thirdReference exampleAs with, it can be widely applied to roulette, blackjack, and other games.
  That is, if the range of numerical values required for game data is 1 to k, the remainder of dividing the exclusive OR of the game data by k is 0 to (k-1). Therefore, the value of k may be set arbitrarily.
  It is not related to the type of game that a plurality of data obtained by dividing the random number M from the most significant bit of the random number M every predetermined bit can be used for the second and subsequent games. For example, if the game uses cards, the data is used to specify the number and marks of cards in the second and subsequent games. If the game is roulette, the data is used for the second and subsequent roulettes. It can be used to identify the eyes.
[0063]
  In addition,BookIn the embodiment, generation of the hash data H based on the random number M and addition of a digital signature with a time stamp to the hash data H are performed by the PKI engine 2208. These two operations are performed by the CPU 2214 or the client. The control means 2004 may be used.
[0064]
  Also,BookAlso in the embodiment, the firstReference exampleSimilarly, if the species information is falsified, the fraud can be detected. Therefore, each information processing apparatus does not need to send the seed information at the same time, and has an advantage that it can be transmitted to the information management apparatus at different times.
[0065]
  In addition,First to third reference examplesThen, only the client device 20 of each child player generates the first and second prime numbers and the composite number, and transmits the first and second prime numbers and the composite number to the server device 10 to constitute the game data. As explained.
  However, the client device 20 of the parent player also generates first and second prime numbers and composite numbers corresponding to the parent player and transmits them to the server device 10, and the first and second prime numbers and composite corresponding to the parent player. The server device 10 may create game data based on the number and the first and second prime numbers and the composite number transmitted from the client device 20 of each child player to the server device 10.
  In this case, even if all of the child players except the parent player conspire to generate the first, second prime numbers, and composite numbers, the first, second prime numbers, and composite numbers of the parent player constitute game data. Therefore, the game data becomes random regardless of the intention of the conspiring child player, and illegal acts can be prevented.
[0066]
  Also,BookIn the embodiment, it has been described that the random number and the hash data are generated only in each client device 20 and the random number and the hash data are transmitted to the server device 10 to constitute the game data.
  However, the client device 20 of the parent player also generates a random number and hash data corresponding to the parent player and transmits it to the server device 10, and the random number and hash data corresponding to the parent player and the client device 20 of each child player. The server device 10 may create the game data based on the random number and the hash data transmitted from the server device 10 to the server device 10.
  In this case, even if all of the child players conspire to generate random numbers and hash data, the random numbers and hash data of the parent player are used to construct game data. Regardless of the player's intention, it becomes random and can prevent fraud.
[0067]
【The invention's effect】
  As described above, according to the present invention, it is possible to prevent cheating of a player who plays a game, which is advantageous when the game is played as gambling..
[Brief description of the drawings]
[Figure 1]First to third reference examples andOf the present inventionBookIt is a block diagram which shows schematic structure of the server apparatus and client apparatus in embodiment.
[Figure 2]First to third reference examples andThe present inventionThe fruitIt is a block diagram which shows schematic structure of the communication game system in embodiment.
FIG. 3 is an external view of a personal authentication device.
FIG. 4 is a block diagram showing a configuration of a personal authentication device.
FIG. 5 shows the firstReference exampleIt is a flowchart which shows this operation | movement.
FIG. 6 is an explanatory diagram of a menu screen.
FIG. 7 is an explanatory diagram of a screen of display means when craps is selected.
FIG. 8 is an explanatory diagram of a screen of display means when a roulette is selected.
FIG. 9 shows the secondReference exampleIt is a flowchart which shows this operation | movement.
FIG. 10 is an explanatory diagram of a screen of display means when blackjack is selected.
FIG. 11 shows the thirdReference exampleIt is a flowchart which shows this operation | movement.
FIG.BookIt is a flowchart which shows operation | movement of embodiment.
FIG. 13 is an explanatory diagram of a screen of display means when craps is selected.
[Explanation of symbols]
  DESCRIPTION OF SYMBOLS 100 ... Communication game system, 10 ... Server apparatus, 1002 ... Server communication means, 1004 ... Server control means, 1006 ... Display means, 1010 ... Game means, 20 ... Client apparatus, 2002 ... Client communication Means 2004... Client control means 2006... Display means 22.

Claims (17)

A communication game system in which a server and a plurality of clients are connected via a communication line, and exchanges information between the server and each client,
The server includes server communication means for performing communication via the communication line, game means for executing a game, and server control means.
Each of the clients includes display means for displaying information, client communication means for performing communication via the communication line,
Random number generating means for generating random numbers;
Hash data generating means for generating hash data of the random number;
Game data generating means for generating game data by dividing the random number into a predetermined number of bits;
Client control means,
The execution of the game by the game means of the server is performed using the game data transmitted from the client communication means to the server communication means,
Each of the client communication means is configured to transmit the hash data to the server,
The server control means is configured to transmit all the hash data to the respective client communication means when receiving all the hash data by the server communication means,
Each of the client control units is configured to cause the client communication unit to transmit the game data to the server after displaying all the hash data received by the client communication unit by the display unit .
The game executed by the game means of the server is performed by performing an operation using all of the game data transmitted from the transmission means of each client.
A communication game system characterized by the above. A server connected to a plurality of clients via a communication line,
The server includes server communication means for performing communication via the communication line, game means for executing a game, and server control means.
The game means is configured to play a game using game data transmitted from the clients to the server communication means,
The server control unit is configured to transmit all the hash data to each client when the server communication unit receives all of the hash data generated from random numbers by each client.
The server communication means is configured such that after each client displays all the received hash data, game data generated by dividing the random number every predetermined number of bits is received from the client. ,
The execution of the game by the game means is performed by performing an operation using all of the game data transmitted from the transmission means of each client.
A server characterized by that.   Information exchange between the server and a plurality of clients is performed based on a public key encryption method, and the game data generation means of each client generates a public key and a secret key based on the public key encryption method. 3. The method according to claim 2, further comprising key generation means, wherein the random number generation by the game data generation means is performed in the process of generating the public key and the secret key by the key generation means of each client. Server.   The server control means is configured to cause the server communication means to transmit all of the game data received from the client communication means to the clients, and to receive from the server communication means by the display means of each client. 3. The server according to claim 2, wherein all of the game data is displayed.   The game progresses when betting data corresponding to a bet amount is bitted, that is, presented to the server by each client, and the server communication means sends the game data from the client to the server. Each of the clients transmits the betting data to the server prior to receiving the game, and the server is configured to process the betting data based on a result of the game. Item 3. The server according to item 2. The game executed by the game means of the server is a game using dice, and the calculation using all of the game data is performed to determine the number of dice eyes. Item 3. The server according to item 2 . The game executed by the game means of the server is a game using a card, and an operation using all of the game data is performed to determine a picture and a number of the card. Item 3. The server according to item 2 . Game executed by the game device of the server is roulette, the calculation using all the game data according to claim 2, characterized in that it is performed to determine the number determined in the roulette Server.   The server according to claim 2, wherein the communication line includes the Internet.   3. The server according to claim 2, wherein when the hash data is generated by the hash data generation means, a digital signature with a time stamp is made on the hash data. A client connected to a server via a communication line,
The client includes display means for displaying information, client communication means for communicating via the communication line,
Random number generating means for generating random numbers;
Hash data generating means for generating hash data of the random number;
Game data generating means for generating game data by dividing the random number into a predetermined number of bits;
Client control means,
The client communication means is configured to transmit the hash data to the server;
The client control unit receives all the hash data from all the clients connected to the server and transmits all the hash data to the client communication unit. After all the hash data has been displayed by the display means, the client communication means is configured to send the game data to the server ,
The game data transmitted to the server by the client communication means is one in which a game is executed by performing calculation using all of the game data by the game means of the server.
A client characterized by that. Information exchange between the server and a plurality of clients is performed based on a public key encryption method, and the game data generation means of each client generates a public key and a secret key based on the public key encryption method. 12. The system according to claim 11 , further comprising a key generation unit, wherein the random number generation by the game data generation unit is performed in the process of generating the public key and the secret key by the key generation unit of each client. Client. 12. The client according to claim 11 , wherein the server receives all the game data received from the client communication means from the server and displays the data by the display means of each client. Each of the client control means compares all the hash data received by the client communication means with all the game data received by the client communication means to determine whether or not the game data has been tampered with. The client of claim 11 , wherein the client is configured to determine. The game progresses when betting data corresponding to a bet amount is bitted, that is, presented to the server by each client, and the server communication means sends the game data from the client to the server. Each of the clients transmits the betting data to the server prior to receiving the game, and the server is configured to process the betting data based on a result of the game. Item 11. The client according to Item 11 . 12. The client according to claim 11, wherein the communication line includes the Internet. 12. The client according to claim 11 , wherein when the hash data is generated by the hash data generation means, a digital signature with a time stamp is given to the hash data.

Images