JP4703812B2 - Digital content authentication method and digital content authentication system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a digital content authentication method and a digital content authentication system realized by using the Internet, for example.
[0002]
[Prior art]
In recent years, open networks represented by the Internet have become widespread worldwide. In this kind of network, access to various products and services is open, and many new business opportunities are created. In such Internet business, network security is indispensable, and as one of them, identity verification and content verification called authentication are performed.
[0003]
Conventionally, passwords are used for authentication for identity verification, and encryption techniques are applied for authentication for content verification.
[0004]
[Problems to be solved by the invention]
However, since such a conventional authentication system on the Internet uses passwords and encryption technology, it is difficult to use for inexperienced users and is inconvenient.
[0005]
An object of the present invention is to solve the disadvantages of the above-mentioned conventional ones, and even for users who are not familiar with passwords and encryption technology, digital content that can realize authentication including identity verification and content verification is simple and easy to use And an authentication system for digital contents.
[0006]
[Means for Solving the Problems]
The present invention is a digital content authentication method in which a sender-side device and a receiver-side device are connected via a communication network to mutually send and receive digital content data and authenticate each other.
The sender side device is:
Computer
Control data for displaying an input screen for inputting a handwritten signature and a seal and digital content data are stored as first data, while the digital content data is stored between the sender side device and the receiver side device. Storing transmission / reception control data for performing transmission / reception in the first storage means;
Displaying a first input screen based on the control data, and storing the handwritten signature data and stamp data on the sender side input on the screen in the first storage means;
Transmitting the first data and the transmission / reception control data to the receiver device as transmission data of a first sender;
Receiving transmission data on the first receiver side from the receiver side device and storing it in the first storage means;
Displaying digital content data of transmission data on the first receiver side of the first storage means and seal data on the receiver side on a screen;
When a confirmation operation is input to the digital content data of the transmission data on the first receiver side displayed on the screen, the handwritten signature data on the receiver side included in the transmission data on the first receiver side Step for displaying on the screen;
After displaying the handwritten signature data on the receiver side, the received transmission data on the first receiver side is displayed.
Transmitting to the receiver side device as transmission data on the second sender side;
And
The receiver side device is:
Computer
Receiving the first sender-side transmission data from the sender-side device and storing it in the second storage means as first receiver-side received data;
Displaying digital content data and seal data on the sender side included in the received data on the first receiver side of the second storage means on the screen;
After displaying the digital content data included in the received data on the first receiver side, a screen based on the control data for displaying the input screen included in the received data on the first receiver side is displayed. Displaying as an input screen of 2;
When the seal data on the receiver side and the signature data on the receiver side are input to the second input screen, the sign data on the sender side included in the received data on the first receiver side is displayed on the screen. Steps,
After displaying the sender-side signature data on the screen, the receiver-side seal data, the receiver-side signature data, and the digital content data included in the first receiver-side received data are used as the first receiver. Sending to the sender device as side transmission data;
The second sender side transmission data is received from the sender side device and stored in the second storage means, and the digital content contained in the second sender side transmission data is sent. A step of displaying hand-side seal data, sender-side signature data, receiver-side seal data, and receiver-side signature data;
The gist is to do.
[0007]
The sender side device is:
Erasing the first data and the transmission / reception control data in the first storage means after transmitting the transmission data on the second sender side; and
The gist is to do.
[0008]
The receiver side device is:
After displaying the digital content, the sender-side seal data, the sender-side signature data, the receiver-side seal data, and the receiver-side signature data included in the second sender-side transmission data, Erasing received data on the receiver side of 1 and
The gist is to do.
[0009]
The sender side device is:
Counting the number of transmissions of transmission data on the first sender side and transmitting until the count value reaches a preset count value;
The gist is to do .
[0010]
The present invention is a digital content authentication system in which a sender-side device and a receiver-side device are connected to each other via a communication network to mutually send and receive digital content data and authenticate each other.
The sender side device is:
Control data for displaying an input screen for inputting a handwritten signature and a seal and digital content data are stored as first data, while the digital content data is stored between the sender side device and the receiver side device. First storage means for storing transmission / reception control data for performing transmission / reception of
Means for displaying a first input screen based on the control data, and storing handwritten signature data and seal data on the sender side input on the screen in the first storage means;
Means for transmitting the first data and the transmission / reception control data to the receiver apparatus as transmission data of the first sender;
Means for receiving transmission data on the first receiver side from the receiver side device and storing it in the first storage means;
Means for displaying digital content data of transmission data on the first receiver side of the first storage means and seal data on the receiver side on a screen;
When a confirmation operation is input to the digital content data of the transmission data on the first receiver side displayed on the screen, the handwritten signature data on the receiver side included in the transmission data on the first receiver side Means for displaying on the screen;
After displaying the handwritten signature data on the receiver side, the received transmission data on the first receiver side is displayed.
Means for transmitting as transmission data on the second sender side to the receiver side device;
With
The receiver side device is:
Means for receiving transmission data on the first sender side from the sender side device and storing it in second storage means as received data on the first receiver side;
Means for displaying on the screen the digital content data and the seal data on the sender side included in the received data on the first receiver side of the second storage means;
After displaying the digital content data included in the received data on the first receiver side, a screen based on the control data for displaying the input screen included in the received data on the first receiver side is displayed. Means for displaying as two input screens;
When the seal data on the receiver side and the signature data on the receiver side are input to the second input screen, the sign data on the sender side included in the received data on the first receiver side is displayed on the screen. Means,
After displaying the sender-side signature data on the screen, the receiver-side seal data, the receiver-side signature data, and the digital content data included in the first receiver-side received data are used as the first receiver. Means for sending to the sender device as side transmission data;
The second sender side transmission data is received from the sender side device and stored in the second storage means, and the digital content contained in the second sender side transmission data is sent. Means for displaying hand-side seal data, sender-side signature data and receiver-side seal data, receiver-side signature data;
It is summarized as having .
[0011]
The sender side device is:
Means for erasing the first data and the transmission / reception control data in the first storage means after transmitting the transmission data on the second sender side;
It is characterized by having
The receiver side device is:
After displaying the digital content, the sender-side seal data, the sender-side signature data, the receiver-side seal data, and the receiver-side signature data included in the second sender-side transmission data, Means for erasing received data on one receiver side;
It is summarized as having .
[0013]
The sender side device is:
Means for counting the number of transmissions of the transmission data on the first sender side, and transmitting until the count value reaches a preset count value;
It is summarized as having .
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing an embodiment of a digital content authentication system according to the present invention. The digital content authentication system 1 sends a digital content transferred using a network such as the Internet to a sender. This is a system for authenticating by exchanging data and recipients using an electronic mail method.
[0022]
Therefore, this digital content authentication system 1 is provided with a sender-side terminal computer 11A and a sender-side mail server 12A on the sender side across a network 10 such as the Internet, while on the receiver side A terminal computer 11B and a receiver mail server 12B are provided, and a program 20 for transferring digital contents between the sender A and the receiver B is provided.
[0023]
The program (main program) 20 includes a management program 21 and an execution program 22, and the execution program 22 is transferred between the sender A and the receiver B.
[0024]
As shown in FIG. 2, the execution program 22 includes a plurality of mutually identical subprograms 30, 30,. The management program 21 sets the subprograms 30, 30,... In the executable state in order from the execution program 22, and transfers each subprogram 30 three times by an e-mail method. When the n-th subprogram 30 has been transferred three times, the execution of the subprogram 30 is completed and the next n + 1-th subprogram 30 is made executable, and all the subprograms 30, 30,. Is completed, the program 20 is used up.
[0025]
Each of the subprograms 30 includes a receiver address storage unit 31B for storing the mail address MB of the receiver B necessary for transmission from the sender A to the receiver B, and a sender A necessary for replying from the receiver B to the sender A. A sender address storage unit 31A that stores the mail address MA and a digital content storage unit 32 that incorporates the digital content DC in a displayable manner are provided.
[0026]
In addition, each subprogram 30 has the sender A self as an identification mark of the sender A for the receiver B to confirm that the execution program 22 that has arrived at the receiver B has been transferred from the sender A. A stamp input section 33A for receiving an input of the seal SA by displaying a predetermined input screen for inputting the seal SA, a sender seal confirmation section 34A for confirming the end of the input operation, and the confirmed seal SA And a sender seal storage unit 35A.
[0027]
In addition, each subprogram 30 receives a message as a guarantee indicator of the sender A for the sender B to confirm that the sender A guarantees that the contents of the incorporated digital content DC are authentic. A hand sign accepting unit 36A for displaying a predetermined handwriting input screen for hand A to input his / her own signature SgA and accepting handwriting input of sign SgA, and a sender sign confirming unit for confirming the end of handwriting input operation 37A and a sender signature storage unit 38A for storing the confirmed signature SgA.
[0028]
Then, the seal SA of the sender A stored in the sender seal storage unit 35A is displayed on the screen (not shown) simply by looking at the subprogram 30 in which the receiver B is in the execution state of the execution program 22 using the receiver terminal computer 11B. Can be confirmed by the receiver B, whereas the signature SgA of the sender A stored in the sender signature storage unit 38A is displayed only when the receiver B opens (activates) the subprogram 30. The receiver B confirms that the content of the digital content DC incorporated in the subprogram 30 is genuine, and the receiver B inputs his / her signature SgB by handwriting, and confirms the end. It is displayed for the first time.
[0029]
In addition, the sign SgA of the sender A displayed at this time is displayed as it is, so that only the sign SgA is prevented from being duplicated, and an appropriate image that can read the sign SgA is superimposed. It is displayed.
[0030]
On the other hand, each subprogram 30 uses the receiver B as an identification mark of the receiver B for the sender A to confirm that the execution program 22 arriving at the sender A has been transferred from the receiver B. A predetermined input screen for inputting the seal SB is displayed, and a receiver seal receiving unit 33B for receiving the input of the seal SB, a receiver seal checking unit 34B for confirming the end of the input operation, and the confirmed seal SB are stored. And a receiver seal storage unit 35B.
[0031]
Further, each subprogram 30 receives the receiver B as a guarantee indicator of the receiver B for the sender A to confirm that the receiver B guarantees that the contents of the incorporated digital content DC are authentic. Displays a predetermined handwriting input screen for handwriting input of his / her signature SgB and receives a handwriting input of the sign SgB, a receiver sign receiving unit 36B for checking the end of the handwriting input operation, and a confirmation And a receiver signature storage unit 38B for storing the signed signature SgB.
[0032]
The seal SB of the receiver B stored in the receiver seal storage unit 35B is displayed on the screen (not shown) simply by looking at the subprogram 30 in which the sender A is in the execution state of the execution program 22 using the sender terminal computer 11A. Can be confirmed by the sender A, but the sign SgB of the receiver B stored in the receiver signature storage unit 38B is displayed only when the sender A sees and opens (activates) the subprogram 30. Instead, the sender A confirms that the content of the digital content DC incorporated in the subprogram 30 is genuine, and is displayed only after the sender A performs a predetermined confirmation operation. It has become.
[0033]
In addition, the sign SgB of the receiver B displayed at this time is displayed as it is, so that only the sign SgB is prevented from being duplicated, so that an appropriate image capable of reading the sign SgB is displayed in an overlapping manner. It has come to be.
[0034]
Therefore, the contents of the digital content DC incorporated in the execution program 22 transferred from the receiver B to the sender A are incorporated into the execution program 22 first transferred from the sender A to the receiver B. A reply digital content match determination unit 39A that determines whether the contents of the digital content DC match with each other by comparing the data of the two digital content DCs. Whether or not the contents of the digital content DC incorporated in the execution program 22 to be transferred is the same as the contents of the digital content DC incorporated in the execution program 22 transferred from the receiver B to the sender A. Retransmit digital content match determined by comparing content DC data It has a tough 39B.
[0035]
Next, the effect | action of said embodiment is demonstrated using the flowchart shown in FIG. 3, and explanatory drawing shown in FIG.
[0036]
First, on the sender A side, when the sender A installs the program (main program) 20 in the sender terminal computer 11A and starts it, the management program 21 is nth (initially 1) from the execution program 22. ) Subprogram 30 is set in an executable state (step S1).
[0037]
Therefore, the sender A inputs the recipient's mail address MB, the sender's mail address MA, the digital content DC, his / her own seal SA, and his / her signature SgA to the subprogram 30 in an executable state ( Step S2).
[0038]
When this input operation is completed, the execution program 22 is transferred to the receiver B side (step S3).
[0039]
At this time, the execution program 22 transferred from the sender A side to the receiver B side is schematically shown as an execution program 22 (1) A in FIG.
[0040]
On the other hand, when the execution program 22 transferred from the sender A side arrives on the receiver B side, the execution program 22 received using the receiver terminal computer 11B is viewed, and a screen (not shown) of the receiver terminal computer 11B is displayed. Then, the seal SA of the sender A is displayed (step S11). Thereby, the receiver B can confirm that the execution program 22 is transmitted from the sender A.
[0041]
At this time, the execution program 22 that has arrived at the receiver B side is schematically shown as an execution program 22 (1) B in FIG.
[0042]
Therefore, when the receiver B confirms that the contents of the digital content DC incorporated in the execution program 22 are authentic, the receiver B inputs his / her seal SB and his / her signature SgB (step S12).
[0043]
When this input operation is completed, the sign SgA of the sender A that has not been displayed so far is displayed so that an appropriate image can be superimposed and read, so that the receiver B has the contents of the digital content DC. It can be confirmed that the sender A guarantees that it is genuine. Then, the execution program 22 is transferred to the sender A side (step S13).
[0044]
At this time, the execution program 22 transferred from the receiver B side to the sender A side is schematically shown as an execution program 22 (2) B in FIG.
[0045]
On the other hand, when the execution program 22 transferred from the receiver B side arrives on the sender A side, the execution program 22 received using the sender terminal computer 11A is viewed, so that the sender terminal computer 11A is not shown. The seal SB of the recipient B is displayed on the screen (step S4). As a result, the sender A can confirm that the execution program 22 has been returned from the receiver B.
[0046]
At this time, the execution program 22 that has arrived at the sender A side is schematically shown as an execution program 22 (2) A in FIG.
[0047]
Accordingly, the sender A confirms that the content of the digital content DC transferred from the receiver B matches the content of the digital content DC first transferred to the receiver B by the reply digital content matching determination unit 39A. Then, a predetermined confirmation operation is performed (step S5).
[0048]
When this confirmation operation is completed, the sign SgB of the receiver B that has not been displayed so far is displayed so that an appropriate image can be overlaid so that the sender A can read the contents of the digital content DC. It can be confirmed that the recipient B guarantees that it is genuine. Then, the execution program 22 is transferred again to the receiver B side (step S6).
[0049]
At this time, the execution program 22 retransferred from the sender A side to the receiver B side is schematically shown as an execution program 22 (3) A in FIG.
[0050]
Simultaneously with the retransfer to the receiver B side, the sender A side erases the execution program 22 (execution program 22 {circle around (1) A} in FIG. 4) that was first transferred to the receiver B and then saved and confirmed execution. The program 22 (execution program 22 {circle around (3) A} in FIG. 4) is saved, and the execution of the subprogram 30 that has been in the execution state is completed (step S7).
[0051]
On the other hand, when the execution program 22 re-transferred from the sender A side arrives on the receiver B side, the receiver program is displayed on the receiver terminal computer 11B by viewing the execution program 22 received using the receiver terminal computer 11B. Then, the seal SA of the sender A is displayed (step S14). Thereby, the receiver B can confirm that the execution program 22 is retransmitted from the sender A.
[0052]
At this time, the execution program 22 that has arrived at the receiver B side is schematically shown as an execution program 22 (3) B in FIG.
[0053]
Accordingly, the receiver B confirms that the content of the digital content DC retransmitted from the sender A matches the content of the digital content DC transferred to the sender A by the retransmit digital content match determination unit 39B. Then, a predetermined confirmation operation is performed (step S15).
[0054]
When this confirmation operation is completed, the execution program 22 (execution program 22 (2) B in FIG. 4) stored after being transferred to the sender A is deleted, and the confirmed execution program 22 (execution program in FIG. 4) is deleted. 22 (3) B) is saved (step S16).
[0055]
Therefore, an execution program 22 (execution program 22 (3) A in FIG. 4) stored on the sender A side, an execution program 22 (execution program 22 (3) B in FIG. 4) stored on the receiver B side, and Are guaranteed to be identical to each other.
[0056]
In the above-described embodiment, the management program 21 is configured to transfer each subprogram 30 from the execution program 22 three times (that is, one reciprocal half). However, the present invention is not limited to this. For example, it can be configured to transfer twice (that is, one round trip) or can be configured to transfer once. For example, a one-to-one contract can be applied as the digital content when transferred three times (one round trip), and similarly, the digital content when transferred twice (one round trip), In addition, various applications are possible as digital contents in the case of transferring only once.
[0057]
In the above embodiment, the execution program 22 is configured to include a plurality of mutually identical subprograms 30, 30,..., But is not limited to this. It is also possible to configure an execution program 22 that has only the functions of the program 30.
[0058]
In the above embodiment, the program (main program) 20 is composed of the management program 21 and the execution program 22, and the execution program 22 is transferred between the sender A and the receiver B. However, the present invention is not limited to this. For example, the program (main program) 20 itself may be transferred between the sender A and the receiver B.
[0059]
In the above embodiment, the digital content is transferred between the sender A and the receiver B by using the electronic mail method. However, the present invention is not limited to this, and a network is used. As long as the digital content can be transferred between the sender A and the receiver B, an appropriate method can be adopted.
[0060]
In the above embodiment, the sign SgA of the sender A is configured to be displayed only when the receiver B inputs his / her own sign SgB by handwriting and confirms the end thereof, but the present invention is not limited to this. In addition, the receiver B can be configured to display the sign SgA of the sender A by performing a predetermined operation, and the sign SgB of the receiver B can also be displayed. A can be configured to be displayed by performing an appropriate operation determined in advance.
[0061]
In the above embodiment, the seal A of the sender A is used as the identification mark of the sender A, and the seal SB of the receiver B is used as the identification mark of the receiver B. However, the present invention is not limited to this. Rather, it is possible to use appropriate marks or other distinguishable signs.
[0062]
Further, in the above embodiment, the handwritten signature SgA of the sender A is used as the guarantee sign of the sender A, and the handwritten sign SgB of the receiver B is used as the guarantee sign of the receiver B. Without limitation, it is possible to use any appropriate sign that can be guaranteed other than the signature.
[0063]
Furthermore, in the above-described embodiment, when displaying the signature SgA of the sender A, the signature SgA is appropriately displayed to the extent that the signature SgA can be read in order to prevent the signature SgA from being copied by displaying it as it is. In the same manner as this, when displaying the signature SgB of the receiver B, the signature SgB is prevented from being duplicated by displaying it as it is. However, the present invention is not limited to this. For example, when the signs SgA and SgB are difficult to duplicate only, Alternatively, when a sign other than a signature is unlikely to cause any particular trouble even if it is duplicated, it is possible to display without overlapping images.
[0064]
【The invention's effect】
As described above, according to the present invention, the digital content transferred from the sender to the receiver using the network can be displayed with the identification sign for confirming the sender, and transferred with the sender's signature turned down. Because the receiver sign is displayed when the receiver confirms the sender with the identification mark and performs a predetermined operation, even for users who are not familiar with passwords and encryption technology, There is an effect that authentication including confirmation can be realized simply and easily.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an embodiment of a digital content authentication system.
FIG. 2 is a conceptual diagram showing an example of a program used in the authentication system of FIG.
FIG. 3 is a flowchart showing the operation of that of FIG. 1;
FIG. 4 is an explanatory diagram illustrating the operation of FIG. 1;
[Explanation of symbols]
1 Digital Content Authentication System 10 Network 11A Sender-side terminal computer 11B Receiver-side terminal computer 12A Sender-side mail server 12B Receiver-side mail server 20 Program (main program)
21 Management program 22 Execution program 30 Subprogram 31A Sender address storage unit 31B Receiver address storage unit 32 Digital content storage unit 33A Sender seal reception unit 33B Receiver seal reception unit 34A Sender seal confirmation unit 34B Receiver seal confirmation unit 35A Sender Seal storage section 35B Receiver seal storage section 36A Sender signature reception section 36B Receiver signature reception section 37A Sender signature confirmation section 37B Receiver signature confirmation section 38A Sender signature storage section 38B Receiver signature storage section 39A Reply digital content match determination section 39B Transmission digital content match determination unit A Sender B Receiver DC Digital content

Claims (8)

A digital content authentication method in which a sender-side device and a receiver-side device are connected via a communication network to mutually send and receive digital content data and authenticate each other,
The sender side device is:
Computer
Control data for displaying an input screen for inputting a handwritten signature and a seal and digital content data are stored as first data, while the digital content data is stored between the sender side device and the receiver side device. Storing transmission / reception control data for performing transmission / reception in the first storage means;
Displaying a first input screen based on the control data, and storing the handwritten signature data and stamp data on the sender side input on the screen in the first storage means;
Transmitting the first data and the transmission / reception control data to the receiver device as transmission data of a first sender;
Receiving transmission data on the first receiver side from the receiver side device and storing it in the first storage means;
Displaying digital content data of transmission data on the first receiver side of the first storage means and seal data on the receiver side on a screen;
When a confirmation operation is input to the digital content data of the transmission data on the first receiver side displayed on the screen, the handwritten signature data on the receiver side included in the transmission data on the first receiver side Step for displaying on the screen;
After displaying the handwritten signature data on the receiver side, the received transmission data on the first receiver side is displayed.
Transmitting to the receiver side device as transmission data on the second sender side;
And
The receiver side device is:
Computer
Receiving the first sender-side transmission data from the sender-side device and storing it in the second storage means as first receiver-side received data;
Displaying digital content data and seal data on the sender side included in the received data on the first receiver side of the second storage means on the screen;
After displaying the digital content data included in the received data on the first receiver side, a screen based on the control data for displaying the input screen included in the received data on the first receiver side is displayed. Displaying as an input screen of 2;
When the seal data on the receiver side and the signature data on the receiver side are input to the second input screen, the sign data on the sender side included in the received data on the first receiver side is displayed on the screen. Steps,
After displaying the sender-side signature data on the screen, the receiver-side seal data, the receiver-side signature data, and the digital content data included in the first receiver-side received data are used as the first receiver. Sending to the sender device as side transmission data;
The second sender side transmission data is received from the sender side device and stored in the second storage means, and the digital content contained in the second sender side transmission data is sent. A step of displaying hand-side seal data, sender-side signature data, receiver-side seal data, and receiver-side signature data;
Authentication method for a digital content and performing. The sender side device is:
Erasing the first data and the transmission / reception control data in the first storage means after transmitting the transmission data on the second sender side; and
2. The digital content authentication method according to claim 1, wherein: The receiver side device is:
After displaying the digital content, the sender-side seal data, the sender-side signature data, the receiver-side seal data, and the receiver-side signature data included in the second sender-side transmission data, Erasing received data on the receiver side of 1 and
Authentication method for a digital contents according to claim 1 or 2, wherein the performing. The sender side device is:
Counting the number of transmissions of transmission data on the first sender side and transmitting until the count value reaches a preset count value;
4. The digital content authentication method according to claim 1, wherein: A digital content authentication system in which a sender-side device and a receiver-side device are connected via a communication network to mutually send and receive digital content data and authenticate each other,
The sender side device is:
Control data for displaying an input screen for inputting a handwritten signature and a seal and digital content data are stored as first data, while the digital content data is stored between the sender side device and the receiver side device. First storage means for storing transmission / reception control data for performing transmission / reception of
Means for displaying a first input screen based on the control data, and storing handwritten signature data and seal data on the sender side input on the screen in the first storage means;
Means for transmitting the first data and the transmission / reception control data to the receiver apparatus as transmission data of the first sender;
Means for receiving transmission data on the first receiver side from the receiver side device and storing it in the first storage means;
Means for displaying digital content data of transmission data on the first receiver side of the first storage means and seal data on the receiver side on a screen;
When a confirmation operation is input to the digital content data of the transmission data on the first receiver side displayed on the screen, the handwritten signature data on the receiver side included in the transmission data on the first receiver side Means for displaying on the screen;
After displaying the handwritten signature data on the receiver side, the received transmission data on the first receiver side is displayed.
Means for transmitting as transmission data on the second sender side to the receiver side device;
With
The receiver side device is:
Means for receiving transmission data on the first sender side from the sender side device and storing it in second storage means as received data on the first receiver side;
Means for displaying on the screen the digital content data and the seal data on the sender side included in the received data on the first receiver side of the second storage means;
After displaying the digital content data included in the received data on the first receiver side, a screen based on the control data for displaying the input screen included in the received data on the first receiver side is displayed. Means for displaying as two input screens;
When the seal data on the receiver side and the signature data on the receiver side are input to the second input screen, the sign data on the sender side included in the received data on the first receiver side is displayed on the screen. Means,
After displaying the sender-side signature data on the screen, the receiver-side seal data, the receiver-side signature data, and the digital content data included in the first receiver-side received data are used as the first receiver. Means for sending to the sender device as side transmission data;
The second sender side transmission data is received from the sender side device and stored in the second storage means, and the digital content contained in the second sender side transmission data is sent. Means for displaying hand-side seal data, sender-side signature data and receiver-side seal data, receiver-side signature data;
A digital content authentication system comprising: The sender side device is:
  Means for erasing the first data and the transmission / reception control data in the first storage means after transmitting the transmission data on the second sender side;
6. The digital content authentication system according to claim 5, further comprising: The receiver side device is:
After displaying the digital content, the sender-side seal data, the sender-side signature data, the receiver-side seal data, and the receiver-side signature data included in the second sender-side transmission data, Means for erasing received data on one receiver side;
7. The digital content authentication system according to claim 5 or 6, further comprising: The sender side device is:
Means for counting the number of transmissions of the transmission data on the first sender side, and transmitting until the count value reaches a preset count value;
The digital content authentication system according to claim 5, further comprising:

Images