JP4795048B2 - Electronic data verification system - Google Patents

Description

  The present invention relates to an electronic data verification system used for verifying the authenticity of electronic data such as an electronic document transmitted and received on a computer network.

  In recent years, with the spread of network technology and the development of related laws, information such as documents that have been exchanged between related parties in the form of a tangible medium in the past, as electronic data, through computer networks such as the Internet, It is transmitted and received between terminals managed by each related party. For example, in the scene of electronic commerce, document information such as an estimate and a contract is transmitted and received, and is treated as “original” of “document” in practice and legally. In order to ensure the trust and legal effect of the parties involved in such handling, it is essential to have a technology that can prove the fact of what electronic document was sent (received).

  Therefore, conventionally, an electronic signature system using an encryption technique such as an RSA private key method has been realized. This is to create an electronic signature by encrypting a hash value extracted from the entire electronic document (and a digital certificate issued by a digital certificate authority) using the private key of the electronic document creator, Attach and send to the other party. The other party decrypts the received electronic signature using the creator's public key to restore the hash value, and separately extracts the hash value from the electronic document and compares the two hash values. Then, when the two hash values match, the other party authenticates the electronic document (that is, the electronic document itself recognized by the creator itself) and has been forged or altered. It can be confirmed that it was not done.

  The same verification technique is used not only for electronic documents but also for verifying the authenticity of all electronic data such as image data of paintings and seals, music data, and the like.

  The conventional verification technique described above can prove the authenticity of the electronic data stored in the work area of the main memory in the computer that creates the electronic signature (see FIG. 9). Strictly speaking, It cannot be guaranteed that the contents displayed on the display of the computer match the contents of the electronic data.

  That is, the electronic data stored in the work area of the main memory is taken into the CPU (Central Processing Unit) by an application for editing or viewing the electronic data, and the image data is obtained by the function of the operating system called by the application. And output to the graphics card. Then, the graphic card engine draws the video memory, converts it to a video signal, transmits it to the display 101, and displays it as a visible image.

  However, if some kind of spyware or virus is lurking in the computer, the spyware or virus causes the CPU to perform an operation that is not based on the application or operating system, and the image that the application passes to the operating system. Since the electronic data on the work area can be arbitrarily modified while the data is latched, or the image data that the application passes to the operating system can be arbitrarily modified, the contents of the electronic data on the work area and the display 101 can be changed. The displayed content may be confused.

  Even in such a case, the creator of the electronic data has no choice but to recognize the contents of the electronic data based on the contents displayed on the display 101. Therefore, the content of the electronic data that the creator has created and recognized as the electronic signature (the content displayed on the display 101), and the electronic signature is actually processed on the work area, and the other party's terminal ( 110), the contents of the electronic data transmitted to 110) are deceived. If such a trap is an electronic document related to a legal act, it will be treated as a matter of legal error (inconsistency between the intentional effect intention and the intention to display), but the reliability of electronic data will be reduced. It is a serious loss.

  As a conventional product, there is a device equipped with a function for creating a digital signature while allowing a private key to be stored in a device (so-called “verification token”) detachable from a USB interface or a memory slot of a computer. . According to such a verification token, it is possible to prevent the secret key from leaking from the terminal 110 to the outside due to a virus or spyware lurking in the terminal 110. However, the verification token is also ineffective against the above-described problem of the content of the electronic data.

  In view of such a conventional problem, the present invention can output the contents of electronic data existing on the work area of a computer as information that can be recognized by a human without using the CPU of the computer. It is an object of the present invention to provide an electronic data verification system that can create electronic data having the contents as recognized by the creator so that the other party can be surely notified.

  The first aspect of the electronic data verification system according to the present invention devised to solve such a problem is that a human recognizes the contents of electronic data existing on the working memory of a computer main body having a removable media interface. An electronic data verification system that outputs as possible information, an interface connectable to the interface of the computer main body, a processor that operates according to a program, a working memory that temporarily stores electronic data processed by the processor, and A token having a data memory for storing a program; an interface to which the interface of the token can be connected; and a conversion mechanism for converting electronic data received through the interface into information that can be recognized by a human and outputting the information externally An output device, and for the token processor, while the token interface is connected to the interface of the computer main body, the program stores electronic data existing on the working memory of the computer main body, Electronic data stored in the token working memory when received via the token interface and stored in the token working memory, and then when the token interface is connected to the output device interface. Is transmitted to the conversion mechanism of the output device via the token interface.

  According to the electronic data verification system according to the present invention configured as described above, while the token interface is connected to the interface of the computer main body, the processor converts the electronic data itself existing in the working memory of the computer main body to the interface. And store it in its own working memory. Thereafter, when the token is detached from the interface of the computer main body and connected to the interface of the output device, the processor transmits the electronic data stored in the working memory to the conversion mechanism of the output device. Then, the conversion mechanism converts the received electronic data into information that can be recognized by a human and outputs the information externally. As a result, the operator can directly recognize the contents of the electronic data existing in the work memory of the computer main body via the token and the output device without going through the CPU of the computer main body or the conversion mechanism. . Therefore, the creator of the electronic data can confirm whether or not the content of the electronic information on the working memory of the computer main body is as perceived by himself / herself. Can confirm the contents of the electronic data intended.

  In the present invention, electronic data represents contents that can be recognized and understood by humans visually or audibly. Therefore, the electronic data may be one that represents contents visually displayed on the display (document data, image data, table data, etc.), or one that represents contents that are output as sound through a speaker (audio data). , Music data, etc.). The conversion mechanism of the output device includes a display and a speaker and a conversion mechanism that converts the electronic data into a signal for driving the display and the speaker according to the type of the electronic data.

  In the present invention, electronic data may be read from a computer main body into a token in an encrypted state. In this case, the token processor stores the electronic data in the working memory in a decrypted state.

  In the present invention, the token processor may perform verification using a conventional electronic signature.

  According to the present invention configured as described above, the contents of electronic data existing in the working memory of the computer main body are converted into information that can be recognized by humans through a token and an output device without using the CPU of the computer main body. Can be output. As a result, electronic data having the contents as recognized by the creator can be created and surely notified to the other party.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<System configuration>
FIG. 1 is an external view of a terminal 1 constituting an electronic data verification system according to an embodiment of the present invention, and FIG. 2 is a block diagram showing an internal circuit configuration thereof. As shown in FIGS. 1 and 2, the terminal 1 is connected to a computer main body 10, a display 20, a video switching device 30, a verification token 40, and a computer main body 10 interposed between the computer main body 10 and the display 20. The keyboard 50 is made up of.

  The computer main body 10 is a computer having a general configuration capable of exchanging data with other terminals through communication via a computer network such as the Internet or offline, and executes data processing as shown in FIG. The CPU 11 is composed of a ROM 12, a RAM 13, a communication card 14, a disk device 15, a graphic card 16, a video interface 17, and a USB interface 18 connected to the CPU 11 through a bus B.

  The disk device 15 includes a hard disk device that stores a program group that is read and executed by the CPU 11 and various data, and a removable disk drive device. The above-described program group includes an operating system for controlling the above-described various hardware and executing communication, and various applications for creating and browsing verification target electronic data. Further, this program group includes a program for executing verification of electronic data (an “external program” described in detail later using the flowcharts of FIGS. 5 and 6).

  The RAM 13 is a main storage device (work memory) in which a work area when the CPU 11 executes various programs is developed. Electronic data created and viewed by an application exists in the work area on the RAM 13.

  The communication card 14 is a communication interface connected to a computer network such as the Internet. The video card 16 draws a screen image in an internal video memory (not shown) under the control of the CPU 11, converts the image into a video signal, and outputs the video signal through the video interface 17.

  The verification token 40 is obtained by adding the function according to the present invention to the above-described existing token (however, as an encryption method, a common key agreed in advance between the parties is used as an encryption key and a signature key. "Common key method" is adopted). Specifically, the verification token 40 includes a CPU 41 that executes data processing, and a ROM 42, a RAM 43, and a USB interface 45 that are interconnected to the CPU 41 through the bus B. The ROM 42 is a rewritable non-volatile memory (data memory) that stores an encryption key and a signature key that have been agreed in advance with the other party as a common key, and is read and executed by the CPU 41 (FIGS. 5 and 5). 6 (token module program), which will be described in detail later using the flowchart of FIG. The RAM 43 is a main storage device (work memory) in which a work area when the CPU 41 executes various programs is developed, and the USB interface 45 is connected to the USB interface 18 of the computer main body 10 to perform verification processing. At this time, verification target electronic data (or an electronic signature) is copied from the RAM 13 of the computer main body 10.

  As shown in the perspective view of FIG. 3, the video switching device (output device) 30 includes a USB interface 31 to which the verification token 40 pulled out from the USB interface 18 of the computer main body 10 is selectively connected, and the computer main body 10. A box-shaped housing in which a video input interface 31 to which an output terminal of a cable connected to the video interface 17 is connected is embedded.

  In the video switching device 30, the video output interface 32 to which the input cable of the display 20 is connected, the graphic card 34 connected to the USB interface 33, and the USB interface 45 of the verification token 40 are connected to the USB interface 33. A token module connection detector 34 for detecting the above and a video switch 36 for switching according to a detection result by the token module connection detector 35 are incorporated.

  The graphic card 34 has the same configuration and function as the one built in the computer main body 10, and draws electronic data received from the verification token 40 as an image of a screen in an internal video memory (not shown). The video signal is converted into a video signal and output from the output terminal (corresponding to a graphic circuit in the conversion mechanism).

  The video switch 36 connects the video input interface 31 to the video output interface 32 when the token module module connection detector 35 detects that the USB interface 45 of the verification token 40 is not connected to the USB interface 33. The video signal generated by the graphic card 16 of the computer main body 10 is output to the display 20. On the other hand, when the token module connection detector 35 detects that the USB interface 45 of the verification token 40 is connected to the USB interface 33, the video switching is performed by connecting the output terminal of the graphic card 34 to the video output interface 32. The video signal generated by the graphic card 34 of the device 30 is output to the display 20.

  The display 20 is a normal analog or digital display (corresponding to a conversion mechanism constituting an output device). Each graphic card 34 outputs a video signal in a format that matches the specifications of the display 20. Therefore, while the verification token 40 is not connected to the USB interface 33 of the video switching device 30, the display 20 is a normal external display that performs screen display using the video signal output from the video interface 17 of the computer body 10. Function.

  The computer main body 10 shown in FIGS. 1 and 2 has a so-called tower-type casing, but may have a notebook-type casing as shown in FIG. In this case, since the computer main body 10 'is provided with a display, the display 12 is not necessarily required when the computer main body 10' executes processing by an application. However, in order to execute the verification process described later, it is necessary to connect the video switching device 30 to the external display video interface 17 of the computer main body 10 ′ via the cable and to connect the display 12.

<Verification process>
Next, the contents of the verification process executed by the CPU 11 of the computer main body 10 that operates according to the above-described external program and the CPU 41 of the verification token 40 that operates according to the above-described token module program will be described with reference to the flowcharts of FIGS. FIG. 5 is a flowchart showing the contents of verification processing at the time of creating an electronic signature for the target electronic data.

  An operator who creates or browses the target electronic data using an application (not shown) connects the token module 40 held by the user to the USB interface 18 of the computer main body 10 and also sends a predetermined command (command for creating an electronic signature). The external program is started by inputting.

  Then, as shown in FIG. 5, the CPU 41 of the verification token 40 activates the token module program by receiving power supply through the USB interface 45, executes a predetermined initialization process in S001, and then executes a computer in S002. It waits for a command to be transmitted from the main body 10. On the other hand, after starting the external program and executing the initialization process in the first S101, the CPU 11 of the computer main body 10 transmits a command (command for creating an electronic signature) to the verification token 40 in S102, and then continues to S103. Then, a copy of the target electronic data existing on the work area of the RAM 13 is transmitted to the verification token 40.

  When the CPU 41 of the verification token 40 receives a command (command for creating an electronic signature) in S002, the CPU 41 of the verification token 40 receives target electronic data transmitted from the computer main body 10 in subsequent S003. In next step S004, the CPU 41 of the verification token 40 creates an electronic signature based on the target electronic data received in step S003. This electronic signature creation is performed according to the existing method described above using the signature key stored in the ROM 42. In the next S005, the CPU 41 of the verification token 40 checks whether or not creation of an electronic signature corresponding to the entire target electronic data has been completed, and if the electronic signature corresponding to the entire target electronic data has not yet been generated. The process returns to S003. On the other hand, if the creation of the electronic signature corresponding to the entire target electronic data has been completed, the CPU 41 of the verification token 40 transmits the completed electronic signature to the computer main body 10 in S006. In step S <b> 104, the CPU 11 of the computer main body 10 temporarily stores the electronic signature received from the verification token 40 on the work area of the RAM 13.

  Next, the CPU 11 of the computer main body 10 transmits the target electronic data existing on the work area of the RAM 13 to the verification token 40.

  The CPU 41 of the verification token 40 receives the target electronic data transmitted from the computer main body 10 in S007. In the next S008, the CPU 41 of the verification token 40 encrypts the target electronic data received in S007 using an encryption key stored in the ROM 42 according to an existing method. In next S009, the CPU 41 of the verification token 40 transmits the ciphertext obtained by the processing in S008 to the computer main body 10. In next S010, the CPU 41 of the verification token 40 checks whether or not the encryption of the entire target electronic data has been completed, and if the encryption of the entire target electronic data has not been completed yet. The process returns to S007. On the other hand, when the encryption of the entire target electronic data has been completed, the CPU 41 of the verification token 40 ends this verification process. When receiving the ciphertext corresponding to the entire target electronic data in S106, the CPU 11 of the computer main body 10 temporarily stores it in the work area.

  The operator who operates the computer main body 10 performs verification check described later on the ciphertext and electronic signature on the work area of the RAM 13 as appropriate, and then sends these ciphertext and electronic signature from the disk device 15. Write to the removable media and hand it over to the other party or send it from the communication card 14 to the other party via the network. The counterpart worker who has received the ciphertext and the electronic signature by any means reads the received ciphertext and the electronic signature onto the work area of the RAM 13 of the computer main body 10 of his / her terminal 1 ′ and performs verification confirmation described later. I do.

  When performing verification confirmation, the operator connects the token module 40 owned by the user to the USB interface 18 of the computer main body 10 and inputs a predetermined command (command for commanding verification verification) to thereby execute an external program. Start up. Then, as shown in FIG. 6, the CPU 11 of the computer main body 10 activates the external program and executes the initialization process in the first S101, and then in S102 sends a command (command for verifying confirmation) to the verification token 40. In step S107, the ciphertext existing on the work area of the RAM 13 is transmitted to the verification token 40, and in step S108, the electronic signature existing on the work area of the RAM 13 is transmitted to the verification token 40.

  When the CPU 41 of the verification token 40 receives the command (command for verifying verification) in S002, it receives the ciphertext transmitted from the computer main body 10 in subsequent S011. In the next S012, the CPU 41 of the verification token 40 executes a decryption process on the ciphertext received in S011. This decryption process is performed according to an existing method using the encryption key stored in the ROM 42, and the decrypted electronic data is written on the work area of the RAM 43. In next S013, the CPU 41 of the verification token 40 checks whether or not the entire target ciphertext has been decrypted. If the entire target ciphertext has not yet been decrypted, the process returns to S011.

  On the other hand, when the entire target ciphertext has been decrypted, the CPU 41 of the verification token 40 reads the electronic data written on the work area of the RAM 43 in S014. In the next S015, the CPU 41 of the verification token 40 creates an electronic signature based on the electronic data read in S014. This electronic signature creation is performed according to the existing method described above using the signature key stored in the ROM 42. In the next S016, the CPU 41 of the verification token 40 checks whether or not the electronic signature corresponding to the entire electronic data has been created, and if the electronic signature corresponding to the entire electronic data has not yet been created. The process returns to S014.

  On the other hand, when the electronic signature corresponding to the entire electronic data has been created, the CPU 41 of the verification token 40 receives the electronic signature transmitted from the computer main body 10.

  In next S018, the CPU 41 of the verification token 40 compares the electronic signature created in S015 with the electronic signature received from the computer main body 10 in S017, and checks whether or not they match. If the two do not match, it is assumed that the encrypted electronic data existing in the work area of the RAM 13 of the computer main body 10 cannot be verified by the electronic signature, and signature mismatch error processing is executed in S019. That is, an error message indicating a mismatch is transmitted to the computer main body 10 and the error message is displayed on the display 12.

  On the other hand, if it is determined in S018 that the two match, the CPU 41 of the verification token 40 determines in S017 that the encrypted electronic data existing in the work area of the RAM 13 of the computer main body 10 is an electronic signature. In step S020, the signature matching process is executed. That is, a message indicating a match is transmitted to the computer main body 10 and the message is displayed on the display 12.

  In any case, the CPU 41 of the verification token 40 executes display processing in the next S021. That is, when the verification token 40 is pulled out from the USB interface 18 of the computer main body 10 and connected to the USB interface 33 of the video switching device 30, the electronic data written on the work area of the RAM 43 in S012 is stored. Then, the data is transmitted to the graphic card 34 of the video switching device 30 through the USB interfaces 45 and 33. Then, as described above, the graphic card 34 converts the received electronic data into a video signal and displays it on the display 20 through the video switch 36 and the video output interface 32. In this case, the message displayed on the display 12 on the computer main body 10 in S019 or S020 may be displayed on the display 12 on the graphic card 34 again.

<Action>
Next, an electronic data verification procedure using the electronic data verification system according to the present embodiment will be described with reference to FIG. For example, when the verification target electronic data is an electronic document, the creator creates an electronic document using an application such as a word processor, a text editor, or spreadsheet software in the computer main body 10 of the terminal 1 managed by the creator. At this time, the creator does not connect the verification token 40 to the video switching device 30. Therefore, since the electronic document created by the application is displayed on the display 20, the worker can proceed with the document creation work while confirming the contents.

  However, when spyware or a virus is lurking in the computer main body 10, as described above, the contents of the electronic document itself existing on the work area of the RAM 13 and the contents displayed on the display 20 are hesitant. There is a possibility.

  Therefore, once the electronic document is completed, the creator connects the self-contained verification token 40 to the USB interface 18 of the computer main body 10 and inputs a command for instructing creation of an electronic signature. Then, by executing the processing shown in FIG. 5, an encrypted electronic document and an electronic signature for the encrypted electronic document are created on the work area based on the electronic document existing on the work area of the RAM 13 of the computer main body 10. (S104, S106).

  Subsequently, the creator inputs a command for instructing verification to the computer main body 10. 6 is executed, the contents of the electronic document encrypted in the encrypted electronic document existing in the work area of the RAM 13 of the computer main body 10 and the contents of the electronic document corresponding to the electronic signature are processed. Are corresponding to each other (S018), and the check result is displayed on the display 12 (S019, S020).

  However, this match / mismatch result does not guarantee that the content of the electronic document displayed on the display 12 by the application matches the content of the encrypted electronic document.

  Therefore, the creator pulls out the verification token 40 from the USB interface 18 of the computer main body 10 and connects it to the USB interface 33 of the video switching device 30. Then, the token module connection detector 35 switches the video switch 36 to the graphic card 34 side, and the CPU 41 of the verification token 40 converts the electronic document (that is, the encrypted electronic document existing in the work area of the RAM 13 of the computer main body 10). The encrypted electronic document itself is input to the graphic card 34. The graphic card 34 draws the content of the input electronic document on an image memory (not shown), converts it into a video signal, and displays it on the display 20 via the video switch 36.

  Thereby, the creator can directly confirm the contents of the electronic document delivered (transmitted) to the other party. At this time, if it is found that the content of the electronic document displayed by the application is inconsistent with the contents, the creator suspects that the computer main body 10 has spyware or a virus, and takes necessary measures to eliminate it. Can do. On the other hand, if the user can be sure that the content of the electronic document displayed by the application matches, the verification token 40 is removed from the USB interface 33 of the video switching device 30 and the content of work performed by the computer main body 10 is displayed on the display 12. Then, a process for transferring (transmitting) the encrypted electronic document and electronic signature existing in the work area of the RAM 13 of the computer main body 10 to the other party is executed.

  On the other hand, the recipient who has received (received) the encrypted electronic document and electronic signature from the creator reads the encrypted electronic document and electronic signature onto the work area of the RAM 13 of the computer main body 10 of his / her terminal 1 ′. Read the contents using browsing software. Then, the self-contained verification token 40 is connected to the USB interface 18 of the computer main body 10 and a command for instructing verification is input. 6 is executed, the encrypted electronic document existing in the work area of the RAM 13 of the computer main body 10 is decrypted, and the contents of the electronic document and the contents of the electronic document corresponding to the electronic signature are obtained. Are corresponding to each other (S018), and the check result is displayed on the display 12 (S019, S020). When a mismatch occurs, there is a possibility that the electronic document encrypted in the encrypted electronic document has been falsified before or after the encryption, or the electronic signature has been falsified. In that case, the recipient may contact the creator separately and request retransmission of the electronic document.

  On the other hand, if the check result indicates a match, the electronic document on the work area of the RAM 43 of the verification token 40 is transferred to the computer main body 10 and developed on the work area of the RAM 13. Later, the contents can be displayed on the display 20 by the browsing program.

  However, when spyware or a virus is lurking in the computer main body 10, as described above, the contents of the electronic document itself existing on the work area of the RAM 13 and the contents displayed on the display 20 are: There is a possibility of hesitation.

  Therefore, the recipient pulls out the verification token 40 from the USB interface 18 of the computer main body 10 and connects it to the USB interface 33 of the video switching device 30. Then, the token module connection detector 35 switches the video switch 36 to the graphic card 34 side, and the CPU 41 of the verification token 40 converts the electronic document (that is, the encrypted electronic document existing in the work area of the RAM 13 of the computer main body 10). The encrypted electronic document itself is input to the graphic card 34. The graphic card 34 draws the content of the input electronic document on an image memory (not shown), converts it into a video signal, and displays it on the display 20 via the video switch 36.

  Thereby, the recipient can directly confirm the contents of the decrypted electronic document. Thereafter, if it is found that the content of the electronic document displayed by the application is inconsistent, the worker may suspect that spyware or a virus is lurking in the computer main body 10 and may take necessary extermination measures. it can. On the other hand, if the user can be confident that the contents of the electronic document displayed by the application match, the user can be confident that the decrypted electronic document is valid and treat it as the original.

  As is clear from the above, in the present invention, it is important to be able to guarantee the originality of the document. Therefore, it is not an essential requirement to encrypt an electronic document. There is no necessity to make it. Also, the electronic signature method is not limited to the above-described one. For example, if only the recipient of the electronic data performs verification and confirmation, an electronic signature of the RSA private key method can be adopted. However, creating an electronic signature is not an essential requirement of the present invention. What is important in the present invention is that the electronic document on the work area of the computer main body 10 is copied onto the RAM 43 of the verification token 40 and directly copied to the display 20 without using the CPU 11 or the graphic card 16 of the computer main body 10. It is to be displayed on the top. Therefore, the content of the electronic document copied in the verification token 40 may be displayed on a display 12 different from the display 12 connected to the computer main body 10. In that case, the video switching device 30 is unnecessary.

  In the present invention, the electronic data to be processed is not limited to an electronic document, and may be music data, for example. This is because the music card according to the electronic data (music data) may not be reproduced due to malfunction of the sound card of the computer main body 10 due to spyware or a virus. In this case, as shown in FIG. 8, a sound card (sound circuit) for converting music data into an analog audio signal is incorporated instead of the graphic card 34, and headphones (speakers) 37 instead of the video output interface 32. Is connected to the headphone jack 32 ′, and an external device 30 ′ having the same configuration as that of the video switching device 30 is used instead of the video switching device 30.

Configuration diagram of terminals constituting a verification system according to an embodiment of the present invention The block diagram which shows the internal circuit of each device which constitutes the terminal Perspective view of video switching device Configuration diagram of a terminal showing an example of changing the computer body to a notebook computer Flowchart showing processing contents by external program and token module program at the time of command input for creating electronic signature Flowchart showing processing contents by external program and token module program at the time of command input for verification confirmation Explanatory diagram showing the operation of the verification system Configuration diagram of device used when target electronic data is music data Explanatory drawing which shows conventional verification processing

Explanation of symbols

1 terminal 10 computer main body 11 CPU
13 RAM
18 USB Interface Card 20 Display 30 Video Switching Device 32 Video Output Interface 33 USB Interface 34 Graphic Card 40 Verification Token 41 CPU
42 ROM
43 RAM
45 USB interface

Claims (4)

An electronic data verification system for outputting the contents of electronic data existing on a working memory of a computer main body having a removable media interface as human-recognizable information,
An interface connectable to the interface of the computer main body, a processor operating according to a program, a working memory for temporarily storing electronic data processed by the processor, and a token having a data memory for storing the program;
An interface to which the interface of the token can be connected, and an output device having a conversion mechanism for converting electronic data received through the interface into information that can be recognized by humans and outputting the information externally,
While the token interface is connected to the computer main body interface, the program transmits electronic data existing in the working memory of the computer main body to the token processor via the token interface. The electronic data stored in the token working memory when the token interface is connected to the output device interface. An electronic data verification system for transmitting to a conversion mechanism of the output device via The electronic data is an electronic document;
2. The electronic data according to claim 1, wherein the conversion mechanism of the output device includes a graphic circuit that converts the electronic document into a video signal, and a display that outputs the video signal converted by the graphic circuit as an image. Verification system. The electronic data is music data;
The conversion mechanism of the output device includes a sound circuit that converts music data into an analog audio signal, and a speaker that outputs the analog audio signal converted by the sound circuit as sound. Electronic data verification system. When the electronic data received from the computer main body is encrypted data, the program causes the token processor to decrypt the original electronic data and store the decrypted electronic data in the token working memory. The electronic data verification system according to claim 1, wherein: