JP5228532B2 - Information display device and program - Google Patents

Description

  The present invention relates to a technique for encrypting document data in an information display device.

  Portable information display devices called electronic paper and electronic books are known. One of the usage scenes of such an information display apparatus is sharing of documents used in a conference. Data exchange when a new document is shared by participants during a conference is performed by a wired connection method such as a USB (Universal Serial Bus) cable, a method using a storage device such as a USB memory or a memory card, a wireless LAN ( There is a method using a network such as Local Area Network.

  Security standards such as WAP (Wireless Application Protocol) are known for networks, particularly wireless LANs (see Non-Patent Document 1, for example).

“What does wireless LAN security standard / function mean?” [Online], ELECOM Co., Ltd., [Search February 7, 2008], Internet <URL: http://www2.elecom.co.jp/network/ wireless-lan / security.html>

In such a standard, the user may need to set an ESS-ID (Extended Service Set Identifier) and an encryption key, which is a burden on the user.
In contrast, the present invention provides a technique for generating an encryption key using document data stored in an apparatus.

In order to solve the above-described problem, the present invention provides a first storage means for storing at least one document data including data of one page or more, and a plurality of parts each specifying a part of information included in a page of document data A second storage unit that stores a template of the document, a first selection unit that selects one page of document data among the document data stored in the first storage unit, and one of the plurality of templates. Second selection means for selecting one template, encryption key generation means for generating an encryption key using information specified by applying the one template to the one page, and using the encryption key, An information display device comprising: encryption means for encrypting document data stored in the first storage means; and output means for outputting the document data encrypted by the encryption means. To provide.
According to this information display device, the document data is encrypted using the encryption key generated using the information specified by applying one template to one page.

In a preferred embodiment, the information display device includes a measuring unit that measures a parameter indicating the surrounding environment, and the second selecting unit selects one template according to the parameter measured by the measuring unit. Also good.
According to this information display device, one template is selected according to a parameter indicating the surrounding environment.

In another preferable aspect, the information display device includes a measurement unit that measures a parameter indicating the surrounding environment, and the first selection unit selects one page according to the parameter measured by the measurement unit. May be.
According to this information display device, one page is selected according to a parameter indicating the surrounding environment.

In still another preferred aspect, the information display device includes a measurement unit that measures a parameter indicating the surrounding environment, and the encryption key generation unit is specified by applying the one template to the one page. The encryption key may be generated using the information and the parameter measured by the measuring unit.
According to this information display device, the encryption key is generated using the parameter indicating the surrounding environment.

In still another preferred embodiment, the information display device includes a reading unit that reads biological information from a user, and the second selection unit selects one template according to the biological information read by the reading unit. May be.
According to this information display device, one template is selected according to the user's biological information.

In still another preferred aspect, the information display device includes reading means for reading biological information from a user, and the first selection means selects one page according to the biological information read by the reading means. May be.
According to this information display device, one page is selected according to the user's biological information.

In still another preferred embodiment, the information display device includes a reading unit that reads biometric information from a user, and the encryption key generation unit includes information specified by applying the one template to the one page, and An encryption key may be generated using biometric information read by the reading means.
According to this information display device, the encryption key is generated using the user's biometric information.

In still another preferred embodiment, the information display device includes: a display unit having a plurality of pixels each for displaying a gradation corresponding to an applied voltage; and document data of a page to be displayed on the display unit. Conversion means for converting into data having a format corresponding to the voltage applied to each of the pixels, and controlling the voltage applied to each of the plurality of pixels based on the data converted by the conversion means, Display means for displaying an image on the display means, and the plurality of templates may designate part of the data converted by the conversion means.
According to this information display device, the encryption key is generated using a part of the data converted by the conversion means.

The present invention also provides a first storage means for storing at least one document data including data of one page or more, and a plurality of templates each specifying a part of information included in a page of document data. A step of selecting one page of document data from among the document data stored in the first storage means, and selecting one template from the plurality of templates. A step of generating an encryption key using information specified by applying the one template to the one page; and document data stored in the first storage means using the encryption key A program for executing the steps of encrypting and outputting the encrypted document data is provided.
According to this program, document data is encrypted using an encryption key generated using information specified by applying one template to one page.

1. Configuration FIG. 1 is a diagram showing a configuration of an information sharing system 1 according to an embodiment of the present invention. The information sharing system 1 includes a plurality (four in this example) of information display devices 10 and a base station 20. Hereinafter, when it is necessary to distinguish each of the plurality of information display devices 10, the information display devices 10-1, 10-2,. The information display device 10 is a device that is operated by different users and displays stored documents. The base station 20 is a device that relays communication between a plurality of information display devices 10 or between the information display devices 10 and an external network (not shown). In this example, the information sharing system 1 is installed in the conference room R.

  FIG. 2 is a diagram illustrating a functional configuration of the information display device 10. The first storage unit 11 stores at least one document data including data of one page or more. Document data refers to data indicating a set of images displayed on the information display device 10. The second storage unit 12 stores a plurality of templates. Each of the plurality of templates designates part of information included in the document data page. The first selection unit 13 selects one page of one document data among the document data stored in the first storage unit 11. The second selection unit 14 selects one template from the plurality of templates. The encryption key generation unit 15 generates an encryption key using information specified by applying one template to one page of a document. The encryption unit 16 encrypts the document data stored in the first storage unit 11 using the generated encryption key. The output unit 17 outputs the document data encrypted by the encryption unit 16.

  The reading unit 18 reads biological information from the user. Here, the encryption key generation unit 15 generates the encryption key using the biological information read by the reading unit 18 in addition to the information specified by applying one template to one page of the document.

  FIG. 3 is a diagram illustrating a hardware configuration of the information display apparatus 10. In this example, the information display device 10 is electronic paper. A CPU (Central Processing Unit) 101 is a control device that controls components of the information display device 10. A ROM (Read Only Memory) 102 is a non-volatile storage device that stores programs and data necessary for starting the information display device 10. A RAM (Random Access Memory) 103 is a storage device that functions as a work area when the CPU 101 executes a program. A video random access memory (VRAM) 104 is a storage device that stores data indicating an image to be displayed on the display body 107 (hereinafter referred to as “main image”). The VRAM 104 has a main image storage area, and the main image is stored in the storage area. An I / O (Input / Output) 105 is an interface for managing input / output of data and signals. A UI (User Interface) button group 106 is a device that outputs a signal according to a user's operation, for example, a button (rewrite button, page feed button, determination button, etc.), keypad, wheel, lever, touch panel, pen. This is an input device including an operator such as a device. The auxiliary storage device 115 is a storage device that stores data that can be displayed on the display unit 107. The UI button group 106 is connected to the I / O 105, and a signal output from the UI button group 106 is input to the CPU 101 via the I / O 105. The timer T is a time measuring device that outputs a signal indicating time.

  The display body 107 is an electrophoretic display (hereinafter referred to as “EPD”) having an electrophoretic display element which is a memory display element. The display control unit 108 is a device that outputs a signal for performing drawing control of the display body 107. Hereinafter, the display body 107 and the display control unit 108 are collectively referred to as “main display” as necessary. The power on / off circuit 111 is a circuit for supplying and stopping power supply to elements such as the display control unit 108 and the CPU 101. Hereinafter, supplying power to a certain component is referred to as “turning on the power”, and stopping supplying power is referred to as “turning off the power”. The power control unit 112 is a device that performs power management of the information display device 10. Specifically, the power control unit 112 controls the power on / off circuit 111 to turn on or off the power of the display control unit 108 and the CPU 101. Further, the power control unit 112 monitors the remaining amount of the battery 113. The battery 113 supplies power to the components of the information display device 10 such as the display control unit 108, the CPU 101, and the RAM 103. The bus 114 is a transmission path used for signal transmission between components.

  The fingerprint sensor 117 is a device that electrostatically reads a user's fingerprint and outputs a signal indicating an image of the read fingerprint. The fingerprint sensor 117 is connected to the I / O 105, and a signal output from the fingerprint sensor 117 is input to the CPU 101 via the I / O 105.

  The ROM 102 stores a control program for performing processing described below. When the CPU 101 executes this control program, the functions shown in FIG. Here, the auxiliary storage device 115 is an example of the first storage unit 11 and the second storage unit 12. The CPU 101 is an example of a first selection unit 13, a second selection unit 14, an encryption key generation unit 15, an encryption unit 16, and an output unit 17. The fingerprint sensor 117 is an example of the reading unit 18.

  FIG. 4 is a diagram illustrating an appearance of the information display device 10. The information display device 10 includes a display surface of the display body 107 and a UI button group 106 on the front surface of the housing.

2. Operation FIG. 5 is a flowchart showing the operation of the information display apparatus 10. The information sharing system 1 generates a common encryption key in the plurality of information display devices 10 according to the flow shown in FIG. 5, and performs encrypted communication using this encryption key. The flow in FIG. 5 is started when, for example, a certain user (hereinafter, this user is referred to as “chairperson”) is instructed to distribute document data to another user (that is, another information display device 10). .

  In step S100, the CPU 101 selects a key page. The “key page” refers to one page of document data among the document data stored in the auxiliary storage device 115, which is used for the encryption key generation process described below. In this example, the CPU 101 selects a key page according to a user instruction. Specifically, the user operates the UI button group 106 and inputs information for specifying the key page to the information display device 10. The CPU 101 specifies one page of document data specified by a signal output from the UI button group 106 as a key page.

  Here, in order to generate a common encryption key in a plurality of information display devices 10, it is necessary to select the same key page in all the information display devices 10 included in the information sharing system 1. For this reason, the chairperson distributes certain document data in advance to users who are participants in the conference. Each user stores the document data in the information display apparatus 10 owned by the user. At the beginning of the meeting, the chairperson verbally conveys information identifying the key page, such as “the XX page of document XX is a key page”. Each user inputs information specifying the key page into his / her information display device 10.

  In step S110, the CPU 101 selects a key template. The “key template” refers to one template among a plurality of templates stored in the auxiliary storage device 115, which is used for the encryption key generation process described below. In this example, the CPU 101 selects a key template in accordance with a user instruction. Specifically, the user operates the UI button group 106 and inputs information for specifying the key template to the information display device 10. The CPU 101 specifies one template specified by a signal output from the UI button group 106 as a key template.

  Here, in order to generate a common encryption key in a plurality of information display devices 10, it is necessary to select the same key template in all the information display devices 10 included in the information sharing system 1. For this reason, the chairman distributes a template group including a plurality of templates in advance to users who will be participants in the conference. Each user stores the template group in the information display apparatus 10 owned by the user. At the beginning of the meeting, the chairman verbally conveys information identifying the key template, such as “XX template is a key template”. Each user inputs information specifying the key template into his / her information display device 10.

  In step S120, the CPU 101 generates an encryption key. Here, the CPU 101 generates an encryption key using information specified by applying the key template to the key page and the user's fingerprint read by the fingerprint sensor 117.

  FIG. 6 is a diagram illustrating a key page and a key template. In this example, the key template TP designates a portion arranged at a specific position in the key page, specifically, a portion corresponding to the window W as information used for generating an encryption key. In the example of FIG. 6, the key page KP includes a character string, and the template TP has three windows W. Therefore, the character string corresponding to the three windows W among the character strings included in the key page KP is designated as information used for generating the encryption key.

  Here, in order to generate a common encryption key in a plurality of information display devices 10, it is necessary to input the same fingerprint in all the information display devices 10 included in the information sharing system 1. For this reason, the chairman reads his / her fingerprint on the information display device 10 of each user. The fingerprint sensor 117 that has read the chairman's fingerprint outputs image data indicating the read fingerprint. The CPU 101 performs processing for extracting information unique to the chairperson's fingerprint, such as processing for extracting feature points from the fingerprint or processing for extracting frequency characteristics by Fourier transform. The CPU 101 generates an encryption key using the information thus extracted from the chairman's fingerprint and the information acquired from the key page and key template.

  A description will be given with reference to FIG. 5 again. In step S130, the CPU 101 encrypts the document data. The document data to be encrypted is the data designated by the user among the document data stored in the auxiliary storage device 115, and is not necessarily the document data used to acquire the information for generating the encryption key. Good. At the time of encryption, the encryption key generated at step S120 is used.

  In step S140, the CPU 101 outputs the encrypted document data. The output data is transmitted to another information display device 10 via the base station 20. The information display device 10 as a transmission destination is designated by the user.

  In a general wireless LAN system, the ESS-ID of a base station is fixed. Therefore, the ESS-ID of the base station 20 is known to a user who has used the conference room R of FIG. 1 before. Even if this user is not a participant in this conference, if the user is malicious, use the ESS-ID of the known base station 20 to eavesdrop on information transmitted / received via the wireless LAN. There is a possibility of trying. At this time, it is not preferable from the viewpoint of security that the participants of the conference share the encryption key via the network or share the information for generating the encryption key via the network. However, according to the present embodiment, as described above, the document data is encrypted based on information (information specifying a key page and a key template) that can be known only by users participating in the conference. It is encrypted using a key. Therefore, even if information transmitted / received via a wireless LAN is eavesdropped by a malicious user, the risk of decoding the information is low. Further, since the information used for generating the encryption key is acquired from the document data by using a template, it can be shared among a plurality of users without making a mistake in inputting complicated information.

3. Other Embodiments The present invention is not limited to the above-described embodiments, and various modifications can be made. Hereinafter, some modifications will be described. In the description of the modification, common reference symbols are used for elements that are common to the embodiment. Two or more of the modifications described below may be used in combination.

3-1. Modification 1
The selection of the key template may be automatically performed based on the surrounding environment of the information display device 10. In this case, the information display apparatus 10 includes a measurement unit that measures a parameter indicating the surrounding environment. The second selection unit 14 selects a key template according to the parameter measured by the measurement unit. Here, the parameters indicating the surrounding environment include the intensity or frequency characteristics of light (conference room R illumination light, light emitted from a specific device), sound (conference room R noise, specific user voice, specific user Loudness or frequency characteristics, temperature, humidity, etc. are used. The information display device 10 includes an optical sensor, a microphone, a thermometer, a hygrometer, and the like as measurement means. The CPU 101 digitizes the parameter measured by the measuring unit. The auxiliary storage device 115 stores a function or table for converting the digitized parameter into information used for selecting a template, and the CPU 101 uses this function or table to make a key based on the digitized parameter. Select a template.

3-2. Modification 2
The selection of the key page may be automatically performed based on the surrounding environment of the information display device 10. In this case, the information display apparatus 10 includes a measurement unit that measures a parameter indicating the surrounding environment. The first selection unit 13 selects a key template according to the parameter measured by the measurement unit. Specific examples of the measuring means and how to use them are the same as those described in the first modification.

3-3. Modification 3
The selection of the key template may be automatically performed based on the user's biological information. In this case, the second selection unit 14 selects one template according to the biological information read by the reading unit 18. In the above-described embodiment, an example in which a fingerprint is used as biometric information has been described. However, biometric information other than a fingerprint, such as a palm vein, a voice print, an iris, a retina, and voice, may be used. A method for selecting a key template from the read biometric information is the same as the method for selecting a key template based on the surrounding environment described in the first modification.

3-4. Modification 4
The selection of the key page may be automatically performed based on the user's biological information. In this case, the first selection unit 13 selects one template according to the biological information read by the reading unit 18. A specific example of the reading unit 18 and a method of using the reading unit 18 are the same as those described in the third modification.

3-5. Modification 5
Information used as seed information for generating an encryption key is not limited to a combination of information specified by applying a key template to a key page and user's biometric information. Any information may be used as seed information for generating an encryption key as long as it includes information specified by applying a key template to a key page. For example, the encryption key may be generated as seed information by combining information specified by applying a key template to a key page and a parameter indicating the surrounding environment of the information display device 10. Alternatively, a combination of information specified by applying a key template to a key page, biometric information of a user, and parameters indicating the surrounding environment may be used as seed information for generating an encryption key. Good.

3-6. Modification 6
A template is not limited to what was demonstrated by the above-mentioned embodiment. Any type of document data may be used as long as it specifies a part of the page of the document data. In the above-described embodiment, the template specifies a part of the data stored in the auxiliary storage device 115, but the template converts the data stored in the auxiliary storage device 115 into display data. It may be applied to things (bitmap data or raster data). The information display device 10 includes display means (display body 107) having a plurality of pixels for displaying gradations corresponding to applied voltages, and document data of a page to be displayed on the display means for each of the plurality of pixels. Conversion means (CPU 101) for converting the data into a format corresponding to the voltage applied to the display, and the display means by controlling the voltage applied to each of the plurality of pixels based on the data converted by the conversion means. Since the display control unit (display control unit 108) for displaying an image is included, the template may specify a part of the data converted by the conversion unit.

3-7. Other Modifications The hardware configuration of the information display apparatus 10 is not limited to that shown in FIG. An apparatus having any hardware configuration may be used as long as the necessary functional configuration can be realized. In the above-described embodiment, an example in which the information display device 10 is electronic paper has been described. However, the information display device 10 may be a device other than electronic paper.

  Further, the correspondence relationship between the functional configuration and the hardware configuration of the information display apparatus 10 is not limited to that described in the embodiment. For example, in the above-described embodiment, the CPU 101 has functions as the first selection unit 13, the second selection unit 14, the encryption key generation unit 15, the encryption unit 16, and the output unit 17. Two or more functions may be realized by a processor other than the CPU 101. In the above-described embodiment, the auxiliary storage device 115 has functions as the first storage unit 11 and the second storage unit 12, but these may be realized by separate storage devices.

  In the above-described embodiment, the program executed by the CPU 101 includes a magnetic recording medium (magnetic tape, magnetic disk (HDD (Hard Disk Drive), FD (Flexible Disk), etc.)), and optical recording medium (optical disk (CD (Compact Disk)). , DVD (Digital Versatile Disk), etc.), magneto-optical recording medium, semiconductor memory (flash ROM, etc.) and the like. The program may be downloaded via a network such as the Internet.

It is a figure showing composition of information sharing system 1 concerning one embodiment. 2 is a diagram illustrating a functional configuration of the information display device 10. FIG. 2 is a diagram illustrating a hardware configuration of an information display device 10. FIG. 1 is an external view of an information display device 10. FIG. 4 is a flowchart showing an operation of the information display device 10. It is a figure which illustrates a key page and a key template.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Information sharing system, 10 ... Information display apparatus, 11 ... 1st memory | storage means, 12 ... 2nd memory | storage means, 13 ... 1st selection means, 14 ... 2nd selection means, 15 ... Encryption key generation means 16 ... Encryption means, 17 ... Output means, 18 ... Reading means, 20 ... Base station, 101 ... CPU, 102 ... ROM, 103 ... RAM, 104 ... VRAM, 105 ... I / O, 106 ... UI button group, DESCRIPTION OF SYMBOLS 107 ... Display body, 108 ... Display control part, 111 ... Power supply ON / OFF circuit, 112 ... Power supply control part, 113 ... Battery, 114 ... Bus, 115 ... Auxiliary storage device, 117 ... Fingerprint sensor

Claims (9)

First storage means for storing at least one document data including one or more pages of data;
Second storage means for storing a plurality of templates each specifying a part of information included in a page of document data;
First selection means for selecting one page of the document data among the document data stored in the first storage means;
Second selection means for selecting one of the plurality of templates;
Encryption key generation means for generating an encryption key using information specified by applying the one template selected by the second selection means to the one page;
Encryption means for encrypting document data stored in the first storage means using the encryption key;
An information display device comprising: output means for outputting the document data encrypted by the encryption means. Having a measuring means for measuring a parameter indicating the surrounding environment,
The information display device according to claim 1, wherein the second selection unit selects one template in accordance with the parameter measured by the measurement unit. Having a measuring means for measuring a parameter indicating the surrounding environment,
The information display device according to claim 1, wherein the first selection unit selects one page according to the parameter measured by the measurement unit. Having a measuring means for measuring a parameter indicating the surrounding environment,
The encryption key generation unit generates the encryption key using information specified by applying the one template to the one page and a parameter measured by the measurement unit. The information display device described. Having reading means for reading biological information from the user,
The information display apparatus according to claim 1, wherein the second selection unit selects one template according to the biological information read by the reading unit. Having reading means for reading biological information from the user,
The information display device according to claim 1, wherein the first selection unit selects one page according to the biological information read by the reading unit. Having reading means for reading biological information from the user,
The encryption key generation unit generates an encryption key using information specified by applying the one template to the one page and biometric information read by the reading unit. The information display device described in 1. Display means having a plurality of pixels each displaying a gradation according to an applied voltage;
Conversion means for converting document data of a page to be displayed on the display means into data having a format corresponding to a voltage applied to each of the plurality of pixels;
Display control means for displaying an image on the display means by controlling a voltage applied to each of the plurality of pixels based on the data converted by the conversion means,
The information display apparatus according to claim 1, wherein the plurality of templates specify a part of the data converted by the conversion unit. First storage means for storing at least one document data including one or more pages of data, and second storage means for storing a plurality of templates each specifying a part of information included in a page of document data A computer device having
Selecting one page of one document data among the document data stored in the first storage means;
Selecting one of the plurality of templates;
Generating an encryption key using information specified by applying the one template to the one page;
Encrypting document data stored in the first storage means using the encryption key;
A program for executing the step of outputting the encrypted document data.

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