JP4812989B2 - Display device and program - Google Patents

Display device and program Download PDF

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Publication number
JP4812989B2
JP4812989B2 JP2001280889A JP2001280889A JP4812989B2 JP 4812989 B2 JP4812989 B2 JP 4812989B2 JP 2001280889 A JP2001280889 A JP 2001280889A JP 2001280889 A JP2001280889 A JP 2001280889A JP 4812989 B2 JP4812989 B2 JP 4812989B2
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Japan
Prior art keywords
display
data
displayed
mode
authentic
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Expired - Fee Related
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JP2001280889A
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Japanese (ja)
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JP2003091612A (en
Inventor
洋一 金井
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株式会社リコー
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Description

[0001]
BACKGROUND OF THE INVENTION
  The present inventionDisplay device and programAbout.
[0002]
[Prior art]
Until now, only paper documents have been treated as official originals in Japanese and other countries. However, in the promotion of an advanced information and communications society, the development of laws to enable electronic documents to be handled as originals (electronic signature law), system revisions and deregulations have been promoted. Technologies for utilizing and saving are also being realized. With such a social background, it is expected that electronic documents will be the originals in the future, and those printed on paper will be treated as simple copies. In other words, it is predicted that “electronic is the main and paper is the subordinate”. When it becomes such a society, new problems that did not exist before will arise. The problem lies in the fact that a special display system is not required if the paper is the original, but some display system (computer) is required to refer to the contents of the electronic original.
[0003]
If an electronic original received from another person is protected by electronic signature technology or the like, it can be confirmed whether the electronic original is correct. However, there is no guarantee that the confirmed electronic original is correctly displayed on the display. Furthermore, there is a suspicion that a fake electronic document that is completely different from the electronic original whose digital signature has been confirmed may be displayed, and the document displayed on the display is unreliable.
[0004]
Conventionally, a technique for ensuring the authenticity of an electronic document by applying a technique such as an electronic signature is disclosed in, for example, Japanese Patent Application Laid-Open No. 2000-285024 “Originality Assured Electronic Storage Method and a program for causing a computer to execute the method” A computer-readable recording medium and a file system and program recording medium disclosed in Japanese Patent Laid-Open No. 10-283262 are known. If an original storage system described in these documents is used, an electronic document can be stored as an original in a state that is extremely difficult to tamper with. However, even if the electronic original is read from the original storage system and displayed on the display with display application software to refer to the contents of the electronic original stored safely, it is actually displayed on the screen. There is no way to confirm that the document is indeed the electronic original itself read from the original storage system. The display application software may display another document as if the electronic original is being read from the original storage system. For example, even if the display application software is reliable, the computer displaying the document may be infected with a virus such as a "Trojan horse". The more problems you have, the more difficult you can trust what is displayed on the display.
[0005]
As another conventional technique, there is Japanese Patent No. 3121738 “Method for Protecting Electronically Published Documents”. This technology distributes document data for electronic publication by encrypting it in such a way that it can only be decrypted by a specific display device or display so that the electronically published document is not illegally copied and distributed. . The purpose of this technology is to ensure the confidentiality of electronic documents and to prevent copying, and the authenticity of data cannot be confirmed.
[0006]
There are many other techniques for devising the display to ensure confidentiality. For example, the technique disclosed in Japanese Patent Laid-Open No. 2000-181970 “Data Display Device and Storage Medium” relates to the display of data with security applied. It is a technique that can display the information in a non-disclosure state, and is a technique that solves the problem related to the confidentiality of data, and cannot authenticate the authenticity of the data in the first place.
[0007]
As described above, various technologies for solving the need to maintain confidentiality have been proposed in the past. However, it is possible to solve the need to guarantee that the displayed electronic data is genuine. There was nothing.
[0008]
[Problems to be solved by the invention]
The present invention has been made in view of the actual situation as described above, and it is possible to ensure that the electronic data displayed on the display (display device) is genuine in order to ensure the authenticity of the electronic document. In other words, an originality assurance display system, an original data creation system for display, an originality assurance system composed of these systems, which can guarantee that the original electronic document is correctly displayed, or these systems It is an object of the present invention to provide a program for causing a computer to function as each unit of the system, and a computer-readable recording medium on which the program is recorded.
[0009]
[Means for Solving the Problems]
  The invention of claim 1A display device for displaying electronic data on a screen, wherein the electronic data to be displayed on the screen is switched to a mode for displaying as an authentic document or a mode for displaying as an ordinary document, and the authenticity is displayed by the display switching unit. When the display mode is switched to the document display mode, the electronic data displayed on the screen includes display data that can be interpreted and displayed by the display, identification information that identifies the display data, display data, and identification information. Display data with a signature including an electronic signature assigned to the display, and the hash value obtained from the display data and identification information included in the display data with signature matches the hash value obtained from the electronic signature In some cases, the electronic data is authentic Authenticity verification means for determining, when the display data is determined to be authentic by the authenticity verification means, the display data is displayed on the screen, and when it is determined that the display data is not authentic Is a display device that is not displayed on the screen.
[0010]
  The invention according to claim 2 is the claim of claim1DescribedIn the display device, an authentic mode for displaying the electronic data as an authentic document, and a normal mode for displaying the electronic data as a general document;It further comprises means for displaying discrimination information so that the user can discriminate which of the electronic data is being displayed..
[0011]
  The invention described in claim 3 is described in claim 1.Display deviceAnd further comprising a warning display means for indicating that the verification by the authenticity verification means has failed, wherein the warning display means displays electronic data that has not been confirmed to be authentic by the authenticity verification means. And
[0012]
  The invention according to claim 4 is the invention according to claim 1.Display deviceInIn the authentic modeIsNormal modeIn this display, information indicating whether or not the display content is authentic is displayed in a region or part not used.
[0013]
  The invention according to claim 5The display device according to claim 4.InIn the authentic mode, the identification information of the electronic data is displayed.It is characterized by that.
[0014]
  The invention described in claim 6The display device according to claim 2.InThe display switching means has a switch for switching between the authentic mode and the normal mode.It is characterized by that.
[0015]
  The invention described in claim 7The display device according to claim 2.InThe display switching means includes a light emitting diode element that displays that the mode has been switched to the authentic mode.It is characterized by that.
[0016]
  The invention described in claim 8A display switching step for switching to a mode for displaying electronic data displayed on the screen as a genuine document or a mode for displaying as a general document, which is a program executed by a computer provided in a display device that displays electronic data on a screen. And the electronic data displayed on the screen identifies display data that can be interpreted and displayed by the display and the display data when the display switching step is switched to the mode for displaying as the authentic document. Display data with a signature including identification information, the display data, and an electronic signature attached to the identification information, the hash value obtained from the display data and the identification information included in the display data with signature, and the electronic Seeking from signature An authenticity verification step for determining that the electronic data is authentic when the hash value matches, and if the display data is determined to be authentic by the authenticity verification step, The program executed by the computer is characterized in that the display data is displayed on the screen and is not displayed on the screen when it is determined not to be authentic.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
(Electronic original creation process)
FIG. 1 is a diagram for explaining a configuration example of a display original data creation system according to an embodiment of the present invention. In the figure, reference numeral 10 denotes a display original data creation system.
The display original data creation system according to the present invention is capable of detecting display data conversion means 11 for converting the original electronic document 1 into display data 2 and tampering of the display data 2 to display the original electronic document 1. It is assumed that display data protection means 12 is provided for performing protection related to the above. Here, it is assumed that the display data protection unit 12 creates original data for display from an electronic document that is an original. In the following description, a person who creates an electronic original is referred to as an “original creator”, and a person who receives and refers to the electronic original is referred to as an “original reference person”.
[0022]
In the display original data creation system in this embodiment, the display data protection means 12 creates an original display data (signed display data) 3 by giving an electronic signature to the display data 2 and relates to the display data 2. The electronic document 1 is protected. The display original data creation system according to the present invention may adopt other forms as long as the system includes the above-described means 11 and 12.
[0023]
In the present embodiment, an original creator first creates an electronic document (data file) 1 that is an electronic original. Of course, a data file created by another person may be regarded as an electronic original by the original creator. The original creator passes this data file 1 to the original reader so that the original reader can use it. In order to enable the original reader to display the data file 1 on the display as if it is not a genuine original, first, On the creator side, the display data conversion means 11 converts the data file 1 as an electronic original into display data 2 that can be displayed and interpreted by the display. Specifically, the display data 2 is a widely used bitmap image, Adobe's PDF (Portable Document Format), Postscript, or ISO / IEC 10180 SPDL (Standard Page Description Language) which is an international standard for page description language. This is considered to be most efficient for realizing the system according to the present invention. However, since the display data 2 here of course is the requirement that the display can be interpreted, in advance if any Knowing what is displayed on the display, to may be a specific display data to the display, the display data May actually be the previous data file itself.
[0024]
Considering the future, it is unlikely that a specific application software data format will be used when creating an electronic original that often requires long-term readability. Therefore, it is predicted that a combination of XML (eXtensible Markup Language) and a style sheet will be adopted as the data file of the electronic original. If the combination of XML and style sheets is used, it is very easy for the display to interpret, so it is natural that the display interprets the data file itself.
[0025]
If the created display data 2 is transferred to the original reference person together with the data file 1, the original reference person can display the electronic original on the display using the display data. I can't verify if the data is authentic.
[0026]
FIG. 2 is a diagram for explaining the processing contents of the display data protection means in the display original data creation system of FIG.
In order to confirm whether the display data 2 is genuine, the original creator side attaches an electronic signature 7 as the original creator to the display data 2 by the display data protection means 12 and displays the signed display data 3 Create At this time, since the created signed display data 3 may be replaced with other signed display data, when the electronic signature 7 is given to the display data 2, not only the display data 2 but also the electronic signature object, Information for identifying the corresponding data file (identification information 4) is included. In practice, the hash value 5 of the data in which the identification information 4 is added to the display data 2 is calculated, encrypted with the signature key 6, and the electronic signature 7 is created by attaching the public key certificate 8.
[0027]
The “information for identifying the data file” may be selected appropriately depending on the contents of the data file to be displayed. Typical examples of the identification information 4 are the file name of the data file 1, the title of the document described in the data file 1, and the document number assigned to the data file 1. Will do. In the case of a data file whose contents are updated over time, the identification information 4 will include not only the title but also date and time information, and if the creator's name is important, the creator's name is also identified. Will be included as part of information 4. The identification of the data file 1 is appropriately selected according to the type of the data file.
Therefore, the display data 3 with a signature has a configuration of display data 2 + identification information 4 + electronic signature 7.
[0028]
Through the processing as described above, the signed display data 3 is associated with the corresponding data file 1 by the identification information 4, and the electronic signature 7 assigned is confirmed for the validity of the public key certificate 8 or the public key certificate 8. By verifying with decryption using the public key attached to, whether the display data has been tampered with, and who has guaranteed that the display data is correct (in this example, the signer Will be confirmed later.
The original creator gives not only the data file but also the display data with the signature created as described above to the original reference person.
[0029]
Up to this point, it has been described as if the original creator and the original referrer were assumed to be different people, but this is only expressed logically, in fact the original creation It is also possible that the person who refers to the original document is the same person. For example, consider a situation where the original created by the original creator two years ago is suddenly needed for some reason and must be displayed on the display. In order to ensure that the original document created two years ago is not different from the original document, the original document creator must be in the position of the original document reference.
[0030]
Further, although the original creator is described as being a person, it may actually be a system rather than a person. For example, if there is a system that issues a certificate, a form in which an electronic signature is given by a signature key of the certificate issuing system itself is also conceivable.
Hereinafter, a process in which an original referring person refers to a data file and a signed display data delivered from the original creator will be described.
[0031]
(Electronic original display processing)
FIG. 3 is a diagram for explaining a configuration example of an originality assurance display system according to an embodiment of the present invention, in which 20 indicates an originality assurance display system.
The originality assurance display system 20 according to the present invention is a display system that guarantees that an original electronic document is correctly displayed, and means for verifying the authenticity of electronic data to be displayed (authentication verification means) ) 22 and special display means (authentic document display means) 23 for displaying the electronic data as an authentic document, and only the electronic data whose authenticity is verified and confirmed by the authenticity verification means 22 is displayed in the authentic document. It is characterized by displaying by means 23. The originality assurance display system 20 according to the present invention executes electronic original display processing, and a typical configuration shown in FIG. 3 will be described as an embodiment thereof.
[0032]
The originality assurance display system 20 according to the present embodiment includes a display unit (general document display unit) 25 for displaying a general document, a genuine mode (“TRUSTED” mode), and a normal mode (“NORMAL” mode). It is assumed that a means (display switching means) 21 for switching between them is provided. Here, the authentic mode is a mode for transmitting data to be displayed to the authenticity verification means 22 in order to verify authenticity, and the normal mode is for displaying a general document that does not need to verify authenticity. In this mode, data to be displayed on the general document display means 25 is transmitted. The display switching means 21 can be switched between the “TRUSTED” mode and the “NORMAL” mode. In the “NORMAL” mode, the display 30 displays the normal display 28. In the “TRUSTED” mode, the authenticity verification means 22 confirms the authenticity of the display data 3 ′ with the signature, and the display data (authentic document screen 26) is displayed by the authentic document display means 23 only when it is confirmed. If it cannot be confirmed, a warning screen 27 is displayed by the warning display means 24. The warning display means 24 may be any means that indicates that the verification by the authenticity verification means 22 has failed, but it is preferable to display electronic data that has not been confirmed as authentic by the authenticity verification means 22. . The display switching means 21, the warning display means 24, and the general document display means 25 are not essential means, but are preferably provided basically for convenience.
[0033]
FIG. 4 is a diagram for explaining the processing contents of the authenticity verification means in the originality assurance display system of FIG.
The authenticity verification means 22 extracts the display data 2 'and the identification information 4' from the signed display data 3 'including the display data 2', the identification information 4 ', and the electronic signature 7', and extracts the hash value 5 '. On the other hand, the electronic signature 7 'is taken out and the electronic signature 7' is decrypted with the public key 9 of the electronic signature 7 'to obtain the hash value 5 ". Here, the hash value 5' and the hash value 5" are obtained. If they match, it is confirmed that the display data 3 'is authentic, and if they do not match, it cannot be confirmed that they are authentic. Note that the fact that the signed display data 3 ′ is confirmed to be authentic is that it is the signed display data 3 created by the display original data creation system, that is, the original is displayed on the display 30. Is proved.
[0034]
In order for the principle of the display system 20 shown in FIG. 3 to be established, it must be ensured that only what is confirmed to be authentic by the authenticity verification means 22 is displayed on the authentic document display means 23. Therefore, it does not make sense to send the display data directly to the authentic document display means 23 by bypassing the authenticity verification means 22. The originality assurance display system 20 is specifically described assuming a display. If all of these means are included in the device itself as a display as expected, the originality assurance display system 20 is configured so that there is no bypass route. The display must be designed. Whether it is necessary to make the display physically tamper-resistant so that it is not truly bypassed is determined by the security level of the place where the display is installed (installed in a room where anyone can enter, or a legitimate user) Depending on whether it is installed in a room that only can enter. In a typical office, you may not have to worry about crafting the interior of the display, and if you are worried, it may be reasonable to lock the room door when no one is in the room.
[0035]
However, if the authenticity verification means 22 is mounted outside the display device, for example, if the authenticity verification means 22 is included in the display driver, the authenticity verification means 22 and the authentic document display means are included. A trusted-channel must be established during 23. For example, when the authenticity verification means 22 and the authentic document display means 23 in the display driver are connected by a network, SSL (Secure Sockets Layer: http: // www. Netscape.com/eng/ssl3/draft302.txt) can be used to establish a trust channel by communicating using the mutual authentication mode (mutual authentication mode), and bypass access to the authentic document display means 22 is possible. It is necessary to exclude sex.
[0036]
Instead of establishing a trust channel, display data may be passed to the authentic document display means 23 together with evidence (certification data) that the authenticity verification means 22 has confirmed the authenticity.
[0037]
Next, a display example on each of the display means 23, 24, and 25 will be described using a display which is a typical form of the originality assurance display system 20.
FIG. 5 is a diagram showing an example of displaying the signer name and identification information on the display of FIG. 3 when authenticity is confirmed, and FIG. 6 is an error notification on the display of FIG. 3 when authenticity cannot be confirmed. It is a figure which shows an example.
When the original referring person has to display the contents of the data file on the screen, the signed display data transferred together with the data file is transferred to the display system (display 30). The display 30 first verifies whether or not the electronic signature attached to the display data with the signed signature is correct.
[0038]
If the validity of the electronic signature can be confirmed, the display 30 extracts the name of the signer from the electronic signature, and also extracts the identification information delivered together with the display data. The display 30 displays the display data in a special mode as shown in the genuine document screen 26, and displays the signer's name and identification information together as shown by reference numeral 26a in FIG. At this time, if it is simply displayed on the display, unauthorized application software may imitate the display. Therefore, as described later, it is necessary for the original reader to be able to determine whether or not the mode is a special mode.
[0039]
When it is not possible to confirm whether the electronic signature is incorrect or correct, it is notified that an error has occurred as indicated by reference numeral 27a in FIG. If the content cannot be displayed simply by notifying the error, the user may be wondering why the error has occurred. Therefore, the error may be notified after displaying the content of the display data as usual.
[0040]
The simplest example of allowing the original reader to determine that it is being displayed in that particular mode is to simply provide a separate display that only displays display data that has been verified for authenticity. However, in this case, since a plurality of displays are required and space is taken, convenience is impaired.
[0041]
As another simple example, as shown in FIGS. 5 and 6, there is a method of displaying information indicating that the authenticity is confirmed in a part different from the area where the display data is displayed. However, in this method, as shown in FIG. 5 and FIG. 6, the special area must be normally not used for display, and a useless area must be provided on the display (unnecessary. Will increase the display).
[0042]
FIGS. 7A and 7B are diagrams showing examples of “TRUSTED” mode discrimination display. FIG. 7A shows an example in which a switch for switching between normal mode and authentic mode is provided, and FIG. 7B shows the authentic mode to the user. An example in which an indicator is provided will be shown.
As another simple example, a display 30 'is provided with a change-over switch, and the switch can be switched to switch between a special mode and a normal mode. As shown in FIG. 7A, the changeover switch 32a may be provided on the operation panel 31 on the outer frame of the display 30 ′. When the switch 32a of the display is switched to the “TRUSTED” mode, only display data whose authenticity has been confirmed is displayed. By doing so, the original reader will switch the switch to the TRUSTED mode as needed. When the switch is set to “NORMAL” mode, a normal screen is displayed. When the TRUSTED mode is set, if the signer's name and identification information are displayed at the bottom of the screen as shown in FIGS. 5 and 6, there is no mistake in another document. Since the mode can be discriminated by the switch, the lower area may be used in the NORMAL mode.
[0043]
In order to guarantee that only display data whose authenticity has been confirmed is displayed when the TRUSTED mode is selected, the security of the display is evaluated by a third party based on, for example, the ISO / IEC 15408 security evaluation standard. Use a display that has been certified.
[0044]
As shown in FIG. 7B, even if the switch is not switched, the switching itself is performed by the system itself that displays the genuine display data, and the mode switching is indicated by the display of the LED 32b provided on the display. There is also a method. Even if you try to display something special on the screen so that you can distinguish it, there is a possibility that it will be imitated as if it is displayed in a special mode, so it is different from the screen like this Reliability can be enhanced by providing a mode discrimination display.
[0045]
In any case, the display is characterized by confirming that the display data is authentic and enabling the original reader to determine that the confirmed data is displayed.
[0046]
In addition, when the check button on the display is pressed, whether or not the TRUSTED mode is displayed on the screen, or when the TRUSTED mode is entered, a voice is used to indicate the special display method and its determination method. However, the basic point is to display in a state that can be distinguished from normal display. In other words, it is sufficient that the system has a means for displaying discrimination information so that the user can discriminate whether the electronic data is displayed by the genuine document display means or the general document display means. It is not specified that this method must be used. A special display method and discrimination method itself are not invented here.
[0047]
As another embodiment of the present invention, a system combining the display original data creation system and the originality assurance display system in each of the above-described embodiments can be realized. In this system (referred to as the originality assurance system), the relationship between the electronic original data that is the original data for display created by the display original data creation system and the contents displayed on the display by the originality assurance display system Is guaranteed.
[0048]
As described above, each embodiment has been described focusing on the originality assurance display system, the original data creation system for display, and the originality assurance system constituted by these systems. However, the present invention is executed in each system. The present invention can also be realized as an originality assurance display method, a display original data creation method, and an originality assurance method, each of which includes each processing procedure. The present invention also provides an originality assurance display system, a display original data creation system, and an originality assurance system, or a program (software) for causing a computer to function as each means constituting the system, and the program It is also possible to adopt a form as a computer-readable recording medium on which is recorded.
[0049]
An embodiment of a recording medium storing a program and data for realizing each process of originality assurance display, display original data creation, and originality assurance according to the present invention will be described. As the recording medium, specifically, a CD-ROM, a magneto-optical disk, a DVD-ROM, an FD, a flash memory, and various other ROMs and RAMs can be assumed. By making a computer execute each process related to the above, and recording and distributing a program for realizing any of the functions of originality assurance display, display original data creation, and originality assurance, the functions can be easily realized. To. Then, the recording medium as described above is mounted on an information processing apparatus such as a computer and the program is read by the information processing apparatus, or the program is stored in a storage medium provided in the information processing apparatus. By reading, it is possible to execute any of the functions of originality assurance display, display original data creation, and originality assurance according to the present invention.
[0050]
【The invention's effect】
According to the present invention, it is possible to ensure that the electronic original is correctly displayed on the display device, and it is possible to ensure the authenticity of the electronic document.
[Brief description of the drawings]
FIG. 1 is a diagram for explaining a configuration example of a display original data creation system according to an embodiment of the present invention;
2 is a diagram for explaining processing contents of display data protection means in the display original data creation system of FIG. 1; FIG.
FIG. 3 is a diagram for explaining a configuration example of an originality assurance display system according to an embodiment of the present invention.
4 is a diagram for explaining the processing content of authenticity verification means in the originality assurance display system of FIG. 3; FIG.
FIG. 5 is a diagram showing an example in which a signer name and identification information when authenticity is confirmed are displayed on the display of FIG. 3;
6 is a diagram showing an error notification example on the display of FIG. 3 when authenticity cannot be confirmed.
FIG. 7 is a diagram illustrating an example of a discrimination display in “TRUSTED” mode.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Electronic document 2, 2 '... Display data 3, 3' ... Display data with a signature, 4, 4 '... Identification information, 5, 5', 5 "... Hash value, 6 ... Signature key, 7, 7 '... Digital signature, 8 ... Public key certificate, 9 ... Public key, 10 ... Original data creation system for display, 11 ... Display data conversion means, 12 ... Display data protection means, 20 ... Originality guarantee display system, 21 ... Display switching means, 22 ... Authenticity verification means, 23 ... Authentic document display means, 24 ... Warning display means, 25 ... General document display means, 26 ... Authentic document screen, 27 ... Warning screen, 28 ... General document screen, 30, 30 '... display.

Claims (8)

  1. A display device for displaying electronic data on a screen,
    Display switching means for switching to a mode for displaying electronic data to be displayed on the screen as a genuine document or a mode for displaying as a general document;
    When the display switching means switches to the mode for displaying as the authentic document, the electronic data displayed on the screen is the display data that can be interpreted and displayed by the display, and the identification information that identifies the display data And the display data with signature including the display data and the electronic signature attached to the identification information, the hash value obtained from the display data and the identification information included in the display data with signature and the electronic signature Authenticity verification means for determining that the electronic data is authentic when the obtained hash value matches, and
    When the display data is determined to be authentic by the authenticity verification means, the display data is displayed on the screen, and when it is determined not to be authentic, it is not displayed on the screen. Display device.
  2. Display discrimination information so that the user can discriminate whether the electronic data is displayed in a genuine mode in which the electronic data is displayed as a genuine document or a normal mode in which the electronic data is displayed as a general document. display apparatus according to claim 1, further comprising a means.
  3. The apparatus further comprises warning display means for indicating that the verification by the authenticity verification means has failed, and the warning display means displays electronic data that has not been confirmed to be authentic by the authenticity verification means. The display device according to claim 1 .
  4. 2. The display device according to claim 1, wherein in the authentic mode, information indicating whether or not the display content is authentic is displayed in a region or part that is not used in the display in the normal mode .
  5. The display apparatus according to claim 4, wherein identification information of the electronic data is displayed in the authentic mode.
  6. The display device according to claim 2, wherein the display switching unit includes a switch for switching between a genuine mode and a normal mode.
  7. The display device according to claim 2, wherein the display switching unit includes a light emitting diode element that displays that the mode is switched to the authentic mode.
  8. A program executed by a computer provided in a display device that displays electronic data on a screen,
    A display switching step of switching to a mode for displaying electronic data to be displayed on the screen as a genuine document or a mode for displaying as a general document;
    When the display switching step is switched to the mode for displaying as the authentic document, the electronic data displayed on the screen is the display data that can be interpreted and displayed by the display, and the identification information that identifies the display data And the display data with signature including the display data and the electronic signature attached to the identification information, the hash value obtained from the display data and the identification information included in the display data with signature and the electronic signature An authenticity verification step for determining that the electronic data is authentic when the obtained hash value matches,
    When the display data is determined to be authentic by the authenticity verification step, the display data is displayed on the screen, and when it is determined not to be authentic, it is not displayed on the screen. A program executed by the computer.
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