JP2009205250A - System, method and program for displaying electronic paper, electronic paper, and cellphone - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent unauthorized browsing by a third party while facilitating disclosure to a specific person. <P>SOLUTION: An electronic paper display system for displaying information including documents and images includes a sender's mobile information device 111 for creating an authentication key, sending the key to electronic paper by close-range communication, and sending it by email; a receiver's mobile information device 112 for sending the authentication key taken out of the mail received from the sender's mobile information device to the electronic paper by close-range communication; a memory 103 for saving the information input to the electronic paper including documents and images; a display unit 104 for displaying the information saved in the memory including documents and images; a close-range communication unit 102 for receiving the authentication key from the sender's mobile device by close-range communication, writing on it, and receiving the authentication key from the receiver's mobile device by close-range communication; and a collation unit 107A for collating the authentication key received by the close range communication unit from the sender's mobile device with the receiver's mobile device, and, if they match, causing the information saved in the memory including documents and images to be displayed. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an electronic paper that displays information such as document contents. In particular, the present invention relates to an electronic paper display system, method, program, electronic paper, and mobile phone using authentication by an IC chip.

Conventionally, when a document to be disclosed only to a specific person is exchanged in a printed form, for example, there is a method of displaying that it is a confidential document. However, as long as the document content is printed, the possibility of a third party browsing without permission, including when the document is lost, cannot be physically excluded.
Further, in addition to the danger that the printed document can be viewed without permission, it is easy to copy and falsify, and it is not suitable as a format for sending and receiving personal information and confidential company information.

In recent years, electronic paper has been widely used in place of printed documents, and information such as document contents is displayed on the electronic paper. There is a problem that it may be viewed without permission by a person.
Furthermore, there is also a problem that when a specific person is disclosed, the specific person can easily browse.

The following patent documents are related to preventing unauthorized viewing of information displayed electronically by a third party.
An object of the present invention is to provide an information storage device that eliminates the inconvenience of an information storage device such as an IC card, enables a user to call data stored in the information storage device anytime and anywhere, and confirm the contents of the data. An IC card that can be connected to a reader / writer by a connector unit and can rewrite personal authentication data and other data stored in the storage unit according to an instruction from the reader / writer. When the personal authentication data is input, the central processing unit queries the personal authentication data stored in the storage unit. If the input personal authentication data is correct, the central processing unit reads the data belonging to the individual's secret from the storage unit and displays it on the display unit. (For example, refer to Patent Document 1).

However, in Patent Document 1, if the input personal authentication data is correct, the data belonging to the individual's secret is read from the storage unit and displayed on the display unit, but the information displayed on the electronic paper is displayed by a third party. It does not prevent unauthorized viewing and does not facilitate disclosure to a specific person.
Conventionally, for the convenience of the user, a passbook using a paper-like electronic display medium that can be displayed in the same manner as a paper-book passbook, and can be rearranged and statistically processed as necessary. Therefore, based on the information data stored in the non-contact / contact IC card LSI, and the non-contact / contact IC card LSI having the authentication means for transmitting / receiving information data to / from the terminal reader / writer The display control LSI that displays information data on the nonvolatile information display unit, the nonvolatile information display unit that maintains the previous display contents until the next rewrite command, and the power supply unit for display driving are flexible. There is also a passbook using a paper-like electronic display medium that is embedded and integrated in a conductive base material and has an input means on the surface of the flexible base material (see, for example, Patent Document 2) .

However, in Patent Document 2, a passbook using a paper-type electronic display medium is provided. However, unauthorized viewing of information displayed on electronic paper by a third party is prevented, and disclosure to a specific person is facilitated. It is not a thing.
Further, in the conventional electronic paper provided with a storage means for storing data and a display means for displaying the data as an image, the data is protected from being acquired by a third party, and the protected data is always required. An object is to provide an electronic paper that can be sent or copied in any case, and an operation means and a display means that are registration means for registering data as secret data, and the secret data is sent from the storage means to the outside. Or a means for registering data as secret data, an operation means and a display means for registering data as secret data, and when secret data is sent from the storage means to the outside by the operation means. There is also a configuration including an authentication unit that requests an operation related to authentication (see, for example, Patent Document 3).

However, in Patent Document 3 described above, data is protected from being acquired by a third party in electronic paper, but the information displayed on the electronic paper is protected from unauthorized viewing by a third party, and at the same time disclosed to a specific person. It doesn't make it easy.
Also, conventionally, in order to obtain an electronic information terminal that can prevent the displayed information from leaking to other than a specific person, the input data is placed on an electronic paper terminal that displays on a liquid crystal display device having a memory property. CPU, SDRAM for storing data, personal authentication means, browsing area detection means, the CPU erases the display of the liquid crystal display device if the personal authentication means that it is not possible to authenticate a user who has usage authority, When the CPU determines that the electronic paper terminal is not allowed to be browsed by the browsing area detection means, the CPU erases the display on the liquid crystal display device (for example, see Patent Document 4).

  However, in the above-mentioned Patent Document 4, it is possible to prevent the displayed information from leaking to other than a specific individual, but it is possible to prevent unauthorized viewing of information displayed on the electronic paper by a third party and at the same time to a specific person. It does not facilitate disclosure.

JP 2002-245422 A JP 2003-248804 A JP 2005-115530 A JP 2006-053688 A

  Accordingly, in view of the above-described problems, the present invention prevents an unauthorized viewing of information displayed on electronic paper by a third party, and at the same time facilitates disclosure to a specific person, a method, a program, and electronic paper And it aims at providing a mobile telephone.

  In order to solve the above problems, the present invention provides an electronic paper display system that displays information including documents and images, generates an authentication key, transmits the generated authentication key to electronic paper by short-range communication, and The sender's portable information device that sends the generated authentication key by e-mail, and the receiver's portable information device that sends the authentication key extracted from the e-mail received from the sender's portable information device to the electronic paper by short-range communication, A memory for storing information including documents and images input to electronic paper, a display unit for displaying information including documents and images stored in the memory, and an authentication key from the sender's portable information device at a short distance Received and written by communication, the near field communication unit receiving the authentication key from the receiver's portable information device by near field communication, and received and written by the near field communication unit An authentication key from a portable information device of a remote operator is collated with the portable information device of the receiver received by the short-range communication unit, and when they match, the information including the document and image stored in the memory is displayed. There is provided an electronic paper display system comprising a collation unit to be displayed on the unit.

Further, the short-range communication of the short-range communication unit, the short-range communication of the portable information device of the sender, and the short-range communication of the portable information device of the receiver are any of IC tag, IC chip, infrared communication, Bluetooth, and wireless LAN. It is one of.
Furthermore, the authentication key generation algorithm is a common key cryptosystem or a public key cryptosystem.
Further, the information including the document and the image is encrypted in advance and stored in the memory, and the information including the document and the image stored when displayed on the display unit is decrypted.

Further, in the memory area, information including documents and images that are restricted from being displayed on the display unit depending on the presence or absence of an authentication key is distinguished and stored. If there is an authentication key, the document and image are stored using the authentication key as a parameter. Save including information.
Further, the memory is a flash memory.
In addition, the collation unit displays a blank sheet state on the display unit when there is a mismatch.
Further, the collation unit deletes information including the document and image displayed on the display unit upon request.
Further, one or both of the near field communication of the sender's portable information device and the near field communication of the receiver's portable information device writes an authentication key to another IC chip, and the near field communication from the other IC chip. The authentication key is transmitted to the part.

  Furthermore, the present invention provides an electronic paper display method for displaying information including a document and an image, a step of storing information including the document and the image input to the electronic paper, and an authentication key is generated by the sender's portable information device And transmitting the generated authentication key to the receiver's portable information device by e-mail and transmitting the generated authentication key to the electronic paper by short-range communication, and the electronic paper authenticating from the sender's portable information device. Receiving the key by short-range communication; transmitting the authentication key extracted from the mail received from the sender's portable information device to the electronic paper by short-range communication; In the paper, an authentication key is received from the receiver's portable information device by short-range communication; in the electronic paper, the authentication received from the sender's portable information device The collated authentication key received from the portable information device receiver, when they match to provide an electronic paper display method characterized by comprising the step of displaying information including documents and images stored with.

  Furthermore, the present invention provides an electronic paper display program for displaying information including documents and images, a procedure for saving information including documents and images input to the electronic paper, and generating an authentication key in the sender's portable information device And sending the generated authentication key to the portable information device of the recipient by e-mail and sending the generated authentication key to the electronic paper by short-range communication, and authenticating from the portable information device of the sender in the electronic paper A procedure for receiving a key by short-range communication; a procedure for transmitting an authentication key extracted from a mail received from the sender's portable information device to the electronic paper by short-range communication; The paper receives the authentication key from the receiver's portable information device by short-range communication, and the electronic paper receives the authentication key from the sender's portable information device. There is provided an electronic paper display program comprising a procedure for collating an authentication key with an authentication key received from the portable information device of the receiver and displaying information including a saved document and image if they match. .

  Furthermore, the present invention provides an electronic paper that displays information including documents and images, a memory that stores information including documents and images input to the electronic paper, and information that includes documents and images stored in the memory. The authentication key is generated by the short-range communication from the sender's portable information device that generates the authentication key, transmits the generated authentication key by e-mail, and transmits the generated authentication key by short-range communication. A short-range communication unit that receives and writes, and receives an authentication key from a receiver's portable information device by short-range communication that transmits the authentication key extracted from the mail received from the sender's portable information device by short-range communication; Check and match the authentication key from the sender's portable information device received and written in the near field communication unit with the authentication key from the receiver's portable information device received in the near field communication unit When that provides an electronic paper, characterized in that it comprises a verification unit for displaying information including documents and images stored in the memory on the display unit.

  Furthermore, the present invention provides an authentication key generating unit for generating an authentication key and transmitting the generated authentication key by e-mail in a mobile phone that restricts display on electronic paper, and the authentication key generating unit generates the authentication key The authentication key generated by the authentication generation unit is transmitted to the electronic paper by short-range communication so that the authentication key extracted and the authentication key extracted from the received mail are collated and displayed on the electronic paper if they match. The mobile phone is provided with an IC chip that transmits and writes the authentication key extracted from the received mail to electronic paper by short-range communication.

As described above, according to the present invention, information including documents and images input to electronic paper is stored, an authentication key is generated by the sender's portable information device, and the generated authentication key is received by the recipient's mobile Send the authentication key to the information device and send the generated authentication key to the electronic paper by near field communication. The electronic paper receives the authentication key from the sender's portable information device by the near field communication and sends it to the receiver's portable information device. The authentication key extracted from the e-mail received from the portable information device of the hand is transmitted to the electronic paper by short-range communication. The electronic key receives the authentication key from the portable information device of the recipient by the short-range communication. Since the authentication key received from the portable information device and the authentication key received from the recipient's portable information device are collated, if they match, the information including the saved document and image is displayed. Only for a specific person, the electronic paper 101 makes it possible to easily disclose information including documents and images, and further, it becomes difficult to copy and falsify information including documents and images. It is expected that user convenience will be improved.
One or both of the short-range communication of the sender's portable information device and the short-range communication of the receiver's portable information device writes the authentication key to the other IC chip and authenticates to the short-range communication unit from the other IC chip. Since the key is transmitted, the cellular phone can be used for other purposes during near field communication.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a conceptual diagram showing a configuration of an electronic paper display system according to the present invention. As shown in the figure, the electronic paper display system is composed of an electronic paper 101 sent from a sender to a receiver, a sender's mobile phone 111 and a receiver's mobile phone 112 via the Internet 113, and the receiver's specific phone system. An operation for displaying information including a document and an image on the electronic paper 101 only for a person is executed by program control.

The sender's mobile phone 111 and the receiver's mobile phone 112 each have an IC chip, and the sender's mobile phone 111 sends an authentication key by e-mail to the receiver's mobile phone 112 via the Internet 113, and the receiver's mobile phone. 112 extracts the authentication key from the received mail and stores it in the IC chip.
The electronic paper 101 mainly includes an IC (integrated circuit) tag 102, a flash memory 103, a display unit 104, and the like.

The IC tag 102 is assumed to be an RFID (Radio Frequency Identification) that performs near field communication. For example, a general IC chip such as Felica can be substituted, and an authentication key from the C chip of the sender's mobile phone 111 is used. The received authentication key is received and written, and the authentication key from the IC chip of the receiver's mobile phone 112 is received.
The flash memory 103 stores information including documents and images input to the electronic paper 101.

The display unit 104 includes an LCD (liquid crystal display unit), and has a function of displaying information including documents and images stored in the flash memory 103. The display unit 104 specifies specific information. Display is restricted for persons other than those who are recipients.
FIG. 2 is a block diagram showing a schematic configuration of the electronic paper 101 and the mobile phones 111 and 112 in FIG. As shown in the figure, more specifically, the electronic paper 101 includes a communication unit 105, an operation unit 106, and a control unit 107 in addition to the IC tag 102, the flash memory 103, and the display unit 104.

The communication unit 105 is, for example, a wireless LAN (local area network), and inputs information including documents and images stored in the flash memory 103 by short-range communication.
The operation unit 106 performs an input operation, a save operation, a display operation, and a display erase operation for information including a document and an image.

The control unit 107 is composed of a CPU (Central Processing Unit), controls the electronic paper 101, and particularly includes a collation unit 107A.
The verification unit 107A receives the authentication key received from the receiver IC chip mobile phone 112 via the IC tag 102 via the near field communication and the sender IC chip mobile phone 111 received from the sender and the IC tag 102. The keys are collated, and display control from the flash memory 103 to the display unit 104 is performed based on the collation result.

Each of the mobile phones 111 and 112 is provided with an authentication key generation unit 120 and an IC chip 130 in addition to the functions of a general mobile phone.
The authentication key generation unit 120 generates an authentication key, and the authentication key generated by the authentication key generation unit 120 is transmitted from the sender's mobile phone 111 to the receiver's mobile phone 112 by mail.
The IC chip 130 transmits an authentication key to the IC tag 102 of the electronic paper 101 by near field communication.

  FIG. 3 is a diagram for explaining a storage method for the flash memory 103 in FIG. As shown in this figure, in the flash memory 103, the storage method of information including a document and an image is distinguished depending on the presence / absence of an authentication key, and display restriction is performed on information including a document and an image with an authentication key. That is, when there is no authentication key, the information A1, A2,... Including the input document and image is stored as usual, and the information A1, A2,. However, if there is an authentication key, information B1, B2,... Including documents and images is stored using the authentication keys X1, X2,... As parameters, and the documents and images are included. For the information B1, B2,.

FIG. 4 is a flowchart illustrating a series of control operation examples of the control unit 109 of the electronic paper 101 in FIG. As shown in this figure, in step S201, when there is an input operation of the operation unit 106, the control unit 107 performs confirmation control of input of information including a document and an image by the communication unit 105. If there is no input of information including a document and an image, the process proceeds to step S205.
In step S <b> 202, when there is input of information including a document and an image, the control unit 107 performs control to check whether the authentication key is written in the IC tag 102.

In step S203, if there is an authentication key written in the control unit 107, the information including the document and the image in which the authentication key is input as a parameter to the display-restricted area of the flash memory 103 by the save operation of the operation unit 106. Control to save.
In step S <b> 204, when there is no writing, the control unit 107 performs control to save information including the document and the image input to the area of the flash memory 103 with no display restriction by the save operation of the operation unit 106.

In step S <b> 205, the control unit 107 performs control to check whether there is a request to display information including a document and an image on the display unit 104 by a display operation of the operation unit 106. If there is no display request, the process returns to step S201 to repeat the above processing.
In step S <b> 206, when there is a display request, the control unit 107 performs control to check whether the authentication key is input to the IC tag 102. If no authentication key is input, the process proceeds to step S213.

If there is an authentication key input in step S207, the collation unit 107A of the control unit 107 has input from the sender's mobile phone 111 and the receiver's mobile phone 112 with the authentication key written in the IC tag 102. Verification is performed based on the authentication key.
If it is determined in step S208 that there is no match, the process proceeds to step S212.
In step S209, if they match as a result of the collation, an authentication key in which information including documents and images stored from the display-restricted area of the flash memory 103 is input is read as a parameter and displayed on the display unit 104. .

In step S <b> 210, the control unit 107 performs confirmation control for whether there is a display erasure request from the operation unit 106.
In step S211, the control unit 107 deletes the information including the document and the image displayed on the display unit 104 when the display is deleted, and ends the process.
In step S212, the control unit 107 displays a blank page state on the display unit 104 and ends the process.

In step S213, the control unit 107 reads information including documents and images stored from the area of the flash memory 103 that is not display-restricted, displays the information on the display unit 104, and ends the process.
FIG. 5 is a flowchart for explaining a series of schematic operations of the sender's mobile phone 111 and the receiver's mobile phone 112. In step S221, in the case of the sender's mobile phone 111, the process proceeds to step S222, and in the case of the receiver's mobile phone 112, the process proceeds to step S225.

In step S222, the authentication key generation unit 120 of the sender's mobile phone 111 generates an authentication key.
In step S223, the sender's mobile phone 111 transmits an authentication key by mail via the Internet 113.
In step S224, the IC chip 130 of the sender's mobile phone 111 transmits an authentication key to the IC tag 102 of the electronic paper 101 by short-range communication, and the process ends.

In step S225, the recipient's mobile phone 112 confirms whether the mail has been received. If not received, the process is terminated.
In step S226, the recipient's mobile phone 112 checks whether the received mail includes an authentication key. If the authentication key is not included, the process ends.
In step S227, when the recipient's mobile phone 112 includes the authentication key in the received mail, the received authentication key is stored in the IC chip 130.

In step S228, the receiver's mobile phone 112 transmits an authentication key from the IC chip 130 to the IC tag 102 of the electronic paper 101 by short-range communication, and the process ends.
Therefore, according to the present invention, it is possible to easily disclose information including a document and an image to only a specific person using the electronic paper 101. Further, a third party of information including a document and an image can be disclosed. Unauthorized browsing, duplication, and alteration are difficult, which is expected to improve user convenience.

  Information including documents and images stored in the flash memory 103 of the electronic paper 101 can be encrypted in advance and decrypted with an authentication key when displayed on the display unit 104.

The key algorithm of the authentication key generated by the authentication key generation unit 120 of the sender's mobile phone 111 can use not only the common key encryption method but also the public key encryption method.
In this case, the authentication key generation unit 120 generates a pair of authentication keys, for example, a public key and a personal key, and one of the authentication keys generated by the authentication key generation unit 120 is the sender's mobile phone 111. The other authentication key generated by the authentication key generation unit 120 is transmitted from the IC chip 130 of the sender's mobile phone 111 to the IC tag 102 of the electronic paper 101 by near field communication. To do. Further, the collating unit 107A confirms that the collation is matched when it is encrypted with one authentication key and decrypted with the other authentication key.

In place of the IC tag 102 of the electronic paper 101, the mobile phone 111 of the sender, and the IC chip 130 of the mobile phone 112 of the receiver in FIG. 1, the authentication key can be transmitted and received using an IC tag, infrared communication, Bluetooth, and wireless LAN. In this case, the authentication key is stored in the memory of the electronic paper 101 and the memory of the recipient's mobile phone.
In the case of a wireless LAN, the electronic paper 101 can receive both information including a document and an image and an authentication key to the flash memory 103 when the communication unit 105 is an unrelated LAN.

  The electronic paper 101 is not limited to the flash memory 103 and can be realized by any nonvolatile semiconductor memory.

  Instead of the receiver's mobile phone 112 and the sender's mobile phone, an IC chip is attached and can be realized with any mobile information device having an Internet connection function, such as a PHS (simple mobile phone) or PDA (mobile information terminal). It is.

  An authentication key is written to an arbitrary IC chip, for example, an IC chip of a credit card from one or both of the IC chip 130 of the receiver's mobile phone 112 and the IC chip 130 of the sender's mobile phone 111, and the IC into which the authentication key is written It is also possible to transmit from the chip to the IC tag 102 of the electronic paper 101 by near field communication. As a result, the mobile phones 111 and 112 can be used for other purposes when transmitted to the IC tag 102.

It is a conceptual diagram which shows the structure of the electronic paper display system which concerns on this invention. It is a block diagram which shows schematic structure of the electronic paper 101 and the mobile telephones 111 and 112 in FIG. It is a figure explaining the preservation | save method with respect to the flash memory 103 in FIG. 3 is a flowchart illustrating a series of control operation examples of a control unit 109 of the electronic paper 101 in FIG. 2. 10 is a flowchart illustrating a series of schematic operations of a sender's mobile phone 111 and a receiver's mobile phone 112.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 ... Electronic paper display system 101 ... Electronic paper 102 ... IC tag 103 ... Flash memory 104 ... Display part 105 ... Communication part 106 ... Operation part 107 ... Control part 107A ... Collation part 111,112 ... Mobile telephone 113 ... Internet 120 ... Authentication Key generation unit 130 ... IC chip

Claims (13)

In an electronic paper display system that displays information including documents and images,
A sender portable information device that generates an authentication key, transmits the generated authentication key to electronic paper by near field communication, and transmits the generated authentication key by e-mail;
The receiver's portable information device that transmits the authentication key extracted from the email received from the sender's portable information device to the electronic paper by short-range communication; and
A memory for storing information including documents and images input to electronic paper;
A display unit for displaying information including documents and images stored in the memory;
A short-range communication unit that receives and writes an authentication key from the sender's portable information device by short-range communication, and receives an authentication key from the receiver's portable information device by short-range communication; and
The authentication key from the sender's portable information device received and written by the short-range communication unit is collated with the portable information device of the receiver received by the short-range communication unit. An electronic paper display system comprising: a collation unit that displays information including a document and an image to be stored on the display unit. The short-range communication of the short-range communication unit, the short-range communication of the portable information device of the sender, and the short-range communication of the portable information device of the receiver are any one of IC tag, IC chip, infrared communication, Bluetooth, and wireless LAN. The electronic paper display system according to claim 1, wherein the electronic paper display system is one. The electronic paper display system according to claim 1, wherein the authentication key generation algorithm is a common key cryptosystem or a public key cryptosystem. The information including the document and the image is encrypted in advance and stored in the memory, and the information including the document and the image stored when the information is displayed on the display unit is decrypted. Character input / function operation device. In the area of the memory, information including documents and images that are restricted from being displayed on the display unit depending on the presence or absence of an authentication key is distinguished and stored. The electronic paper display system according to claim 1, wherein the electronic paper display system is stored. The electronic paper display system according to claim 1, wherein the memory is a flash memory. The electronic paper display system according to claim 1, wherein the collation unit displays a blank state on the display unit in the case of mismatch. The electronic paper display system according to claim 1, wherein the collation unit erases information including a document and an image displayed on the display unit upon request. One or both of the short-range communication of the sender's portable information device and the short-range communication of the receiver's portable information device writes an authentication key to another IC chip and transfers the authentication key from the other IC chip to the short-range communication unit. The electronic paper display system according to claim 1, wherein an authentication key is transmitted to the electronic paper display system. In an electronic paper display method for displaying information including documents and images,
Storing information including documents and images input to electronic paper;
A step of generating an authentication key in the sender's portable information device, sending the generated authentication key to the recipient's portable information device by e-mail, and sending the generated authentication key to electronic paper by short-range communication;
In the electronic paper, receiving an authentication key from the sender's portable information device by short-range communication,
In the receiver's portable information device, transmitting the authentication key taken out from the mail received from the sender's portable information device to the electronic paper by short-range communication;
In the electronic paper, receiving an authentication key from the portable information device of the receiver by short-range communication;
The electronic paper collates the authentication key received from the sender's portable information device with the authentication key received from the receiver's portable information device, and displays the information including the saved document and image if they match. An electronic paper display method comprising: In an electronic paper display program for displaying information including documents and images,
A procedure for storing information including documents and images entered in electronic paper;
A procedure for generating an authentication key in the sender's portable information device, sending the generated authentication key to the recipient's portable information device by e-mail, and sending the generated authentication key to electronic paper by short-range communication;
In the electronic paper, a procedure for receiving an authentication key from the sender's portable information device by short-range communication,
In the receiver's portable information device, a procedure for transmitting the authentication key extracted from the mail received from the sender's portable information device to the electronic paper by short-range communication,
In the electronic paper, a procedure for receiving an authentication key from the portable information device of the receiver by short-range communication,
In the electronic paper, the authentication key received from the sender's portable information device and the authentication key received from the receiver's portable information device are collated, and if they match, a procedure for displaying information including the saved document and image; An electronic paper display program comprising: In electronic paper that displays information including documents and images,
A memory for storing information including documents and images input to electronic paper;
A display unit for displaying information including documents and images stored in the memory;
Generate an authentication key, send the generated authentication key by e-mail, and receive and write the authentication key from the sender's portable information device that transmits the generated authentication key by short-range communication, A short-range communication unit that receives an authentication key from a receiver's portable information device by short-range communication that transmits the authentication key extracted from the email received from the sender's portable information device by short-range communication; and
When the authentication key from the sender's portable information device received and written in the short-range communication unit and the authentication key from the receiver's portable information device received in the short-range communication unit are collated and match An electronic paper comprising: a collation unit that displays information including documents and images stored in the memory on the display unit. In mobile phones that restrict display on electronic paper,
An authentication key generation unit for generating an authentication key and sending the generated authentication key by e-mail;
In order to make the authentication key generated by the authentication key generation unit collate with the authentication key extracted from the received mail, and display the result on the electronic paper if they match, the authentication key generated by the authentication generation unit is A mobile phone comprising: an IC chip that transmits and writes to electronic paper by distance communication, or transmits an authentication key extracted from a received mail to electronic paper by short-range communication.

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