JP5062021B2 - Data output system, communication terminal, data output method, and program - Google Patents

Description

  The present invention relates to a data output system, a communication terminal, a data output device, a data output method, and a program for outputting electronic data stored in a data server via a communication line.

  When a presentation is performed using electronic data outside the company, generally, a personal computer or a removable medium storing the electronic data is taken out of the company, and the electronic data is output to a display device such as a projector.

Patent Document 1 discloses a system in which presentation data is stored in a mobile terminal, and the data is transmitted to a projector for projection. In this system, control signals such as turning on / off the projector, starting projection, and switching the projection screen can be performed by wirelessly transmitting a control signal from the portable terminal to the projector.
JP 2003-198870 A

  However, with the above-described technology, there is a possibility that electronic data may be leaked when a personal computer, a removable medium, or a portable terminal is lost during movement.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a data output system, a communication terminal, a data output device, a data output method, and a program with a low possibility of leakage of electronic data. There is.

According to the present invention, a data server storing electronic data;
A communication terminal for receiving the electronic data from the data server via a communication line;
A data output device that outputs the electronic data received by the communication terminal to allow the user to recognize the electronic data;
With
The data server is
Data storage means for storing the electronic data;
Transmitting means for transmitting the electronic data to the communication terminal;
Have
The communication terminal is
Receiving means for receiving the electronic data;
Encryption means for generating encrypted data by encrypting the electronic data;
A communication terminal side output means for outputting the encrypted data;
Have
The data output device includes:
Obtaining means for obtaining the encrypted data;
Decryption means for decrypting the encrypted data into the electronic data;
Output device side output means for outputting the decrypted electronic data;
A data output system is provided.

According to the present invention, receiving means for receiving the electronic data from a data server storing electronic data via a communication line;
Encryption means for generating encrypted data by encrypting the electronic data;
Encrypted data output means for outputting the encrypted data to a data output device having decryption means;
A communication terminal is provided.

According to the present invention, encrypted data receiving means for receiving encrypted data generated by the communication terminal encrypting electronic data from the communication terminal;
Decryption means for decrypting the encrypted data into the electronic data;
An output means for outputting the decrypted electronic data to make the user recognize;
A data output device is provided.

  It should be noted that any combination of the above-described constituent elements and a conversion of the expression of the present invention between a method, an apparatus, a system, a recording medium, a computer program, etc. are also effective as an aspect of the present invention.

  According to the present invention, since it is not necessary to carry a personal computer, a removable medium, or a portable terminal that stores electronic data, the possibility of leakage of electronic data is reduced.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In all the drawings, the same reference numerals are given to the same components, and the description will be omitted as appropriate.

  FIG. 1 is a block diagram showing a configuration of a data output system according to the first embodiment. This data output system includes a data server 200, a communication terminal 300, and a data output device 400. The communication terminal 300 and the data output device 400 are connected to each other via, for example, a communication cable (USB cable or the like) 52, but may be connected to each other by wireless communication. The data server 200 is installed in the company, for example, and includes a data storage unit that stores electronic data and a transmission unit that transmits the electronic data to the communication terminal 300. The communication terminal 300 includes a reception unit (acquisition unit) that receives electronic data from the data server 200 via the communication line 50, an encryption unit that generates encrypted data by encrypting the electronic data, and encrypted data. Is output. The communication terminal 300 is a mobile communication terminal, for example, and the communication line 50 includes, for example, an Internet line and a public wireless communication network. The data output device 400 includes a receiving unit that acquires encrypted data, a decrypting unit that decrypts the encrypted data into electronic data, and an output unit that outputs the decrypted electronic data so that the user can recognize the decrypted electronic data. Yes. In the example shown in this figure, the data output device 400 outputs electronic data to the display device 500. The display device 500 performs display based on the input electronic data. The display device 500 is, for example, a projector or a thin display.

  According to this data output system, there is no need to carry a personal computer, a removable medium, or a portable terminal that stores electronic data. For this reason, even if a personal computer, a removable medium, or a portable terminal is lost while moving, electronic data does not leak. Hereinafter, the communication terminal 300 will be described in detail as a mobile communication terminal.

  The data output system shown in FIG. 1 further has an in-house terminal 100. The in-house terminal 100 is used when a user of the data output system edits electronic data and when the user stores electronic data in the data server 200.

  FIG. 2 is a block diagram illustrating an example of a functional configuration of the data server 200. In this example, the data server 200 includes an internal ID receiving unit 202, an internal authentication processing unit 204, a registration processing unit 206, an external ID receiving unit 222, an external authentication processing unit 224, a timed URL generation unit 226, and a transmission unit 228 as functional units. And an authentication data storage unit 240 and an electronic data storage unit 250 as storage units.

  The internal ID receiving unit 202 and the internal authentication processing unit 204 perform authentication processing when the in-house terminal 100 connects to the data server 200. The external ID receiving unit 222 and the external authentication processing unit 224 perform authentication processing when the communication terminal 300 connects to the data server 200. The authentication data storage unit 240 stores information necessary for authentication processing performed by the internal ID reception unit 202, the internal authentication processing unit 204, the external ID reception unit 222, and the external authentication processing unit 224.

  The electronic data storage unit 250 stores electronic data. The registration processing unit 206 stores the electronic data transmitted from the in-house terminal 100 in the electronic data storage unit 250. The timed URL generation unit 226 and the transmission unit 228 perform a series of processes when transmitting the electronic data stored in the electronic data storage unit 250 to the communication terminal 300.

  The details of the operations performed by each functional unit described above will be described later using a flowchart. The data configuration of the data stored in the authentication data storage unit 240 and the electronic data storage unit 250 will be described later using a table.

  FIG. 3 is a diagram illustrating an example of a data configuration of data stored in the authentication data storage unit 240 in a table format. In this example, the authentication data storage unit 240 stores, for each user of the data output system, the user ID, the password set by the user, and the terminal ID of the communication terminal 300 possessed by the user in association with each other. . In the example shown in FIG. 3, the terminal ID is the telephone number of the communication terminal, but may be an individual identification number.

  FIG. 4 is a diagram illustrating an example of a data configuration of data stored in the electronic data storage unit 250 in a table format. In this example, the electronic data storage unit 250 stores electronic data and its title in association with the user ID of the user who registered the electronic data. In the example shown in this figure, the electronic data storage unit 250 stores one electronic data in a plurality of data formats. One of these data formats is a data format for displaying electronic data on the communication terminal 300, and another data format is a data format for displaying electronic data on the display device 500.

  FIG. 5 is a block diagram illustrating an example of a functional configuration of the communication terminal 300. In this example, the communication terminal 300 includes an input unit 302, an ID transmission unit 304, a timed URL reception unit 306, an electronic data reception unit 308, a display unit 310, an encryption unit 312, a writing unit 314, and a removable media holding unit as functional units. 315 and a transmission unit 316, and a terminal ID storage unit 318 as a storage unit.

  The input unit 302 is a part where the user inputs to the communication terminal 300. The display unit 310 has a display panel, and displays information to make the user recognize the information. The terminal ID storage unit 318 stores a terminal ID (for example, a telephone number or an individual identification number) of the communication terminal 300. The removable media holding unit 315 holds a removable medium (for example, a memory card) 50. The removable media holding unit 315 and the removable media 60 are examples of the terminal-side storage unit.

  The ID transmission unit 304, the timed URL reception unit 306, the electronic data reception unit 308, the encryption unit 312, and the writing unit 314 perform a series of processes when the communication terminal 300 receives electronic data from the data server 200. The transmission unit 316 performs processing for outputting the encrypted data from the communication terminal 300 to the data output device 400. Details of operations performed by these functional units will be described later with reference to flowcharts.

  FIG. 6 is a block diagram illustrating an example of a functional configuration of the data output device 400. In this example, the data output device 400 includes a receiving unit 402, a decoding unit 404, a RAM control unit 406, a RAM 407, and an output unit 408. In this example, the data output device 400 has only the RAM 407 as means for storing data. Details of processing performed by the reception unit 402, the decoding unit 404, the RAM control unit 406, and the output unit 408 will be described later with reference to flowcharts.

  In FIGS. 2, 5, and 6, the configuration of portions not related to the essence of the present invention is omitted. For example, in FIG. 5, a wireless communication function unit, a speaker, a microphone, and the like, which are configurations of a general mobile phone terminal, are not illustrated. Each component of each device shown in FIGS. 2, 5, and 6 is not a hardware unit configuration but a functional unit block. Each component of each device is composed mainly of a CPU of a computer, a memory, a program that realizes the components of this figure loaded in the memory, a storage unit such as a hard disk that stores the program, and a network connection interface. It is realized by any combination of software and software. It will be understood by those skilled in the art that there are various modifications to the implementation method and apparatus.

  FIG. 7 is a flowchart showing an example of the operation of the data processing system when the user stores electronic data in the data server 200. First, the user creates electronic data using the in-house terminal 100 (S10). Next, the user inputs the user ID and password to the in-house terminal 100 (S20). The in-house terminal 100 transmits the input user ID and password and the terminal identification data of the in-house terminal 100 to the data server 200 (S30).

  The internal ID receiving unit 202 of the data server 200 receives the user ID and password transmitted from the in-house terminal 100 and the terminal identification data, and outputs them to the internal authentication processing unit 204. The internal authentication processing unit 204 confirms whether or not the combination of the user ID and password received by the internal ID receiving unit 202 is stored in the authentication data storage unit 240. When the combination of the user ID and the password is stored in the authentication data storage unit 240, the in-house terminal 100 is authenticated (S40: Yes), and the terminal identification data is output to the registration processing unit 206. The registration processing unit 206 transmits registration screen data, which is data for displaying a registration screen of electronic data, to the in-house terminal 100 using the input terminal identification data (S50). In addition, when the combination of a user ID and a password is not memorize | stored in the authentication data storage part 240 (S40: No), the data server 200 complete | finishes a process.

  When receiving the registration screen data, the in-house terminal 100 displays a registration screen (S60). The user inputs information necessary for registration of electronic data according to the registration screen. Next, the in-house terminal 100 transmits the input information and electronic data to the data server 200 (S70).

  The registration processing unit 206 of the data server 200 receives the electronic data transmitted by the in-house terminal 100 and converts the data format of the electronic data into a data format that can be processed by the communication terminal 300 and a data format that can be displayed by the display device 500. These are all image data. Specifically, the former is, for example, the Flash Lite format, and the latter is, for example, the GIF format. The registration processing unit 206 stores the converted data in the electronic data storage unit 250 (S80).

  FIG. 8 is a flowchart illustrating an example of processing when the user transmits electronic data from the data server 200 to the communication terminal 300. First, the user inputs a user ID and a password to the input unit 302 of the communication terminal 300 (S210). The input unit 302 outputs the input user ID and password to the ID transmission unit 304. Next, the ID transmission unit 304 reads a terminal ID (for example, a telephone number or an individual identification number) from the terminal ID storage unit 318. Next, the ID transmission unit 304 transmits the user ID, terminal ID, and password to the data server 200 (S220).

  The external ID receiving unit 222 of the data server 200 receives the user ID, terminal ID, and password from the communication terminal 300 and outputs the received user ID, terminal ID, and password to the external authentication processing unit 224. The external authentication processing unit 224 confirms whether the combination of the input user ID, terminal ID, and password is stored in the authentication data storage unit 240. When the combination of the user ID, the terminal ID, and the password is stored in the authentication data storage unit 240, the communication terminal 300 is authenticated (S230: Yes), and the terminal ID and the user ID are output to the timed URL generation unit 226. When the combination of the user ID, the terminal ID, and the password is not stored in the authentication data storage unit 240 (S230: No), the data server 200 ends the process.

  Next, the timed URL generation unit 226 reads all the titles of the electronic data stored corresponding to the input user ID from the electronic data storage unit 250 and generates selection screen data for displaying the read title list. And output to the transmission unit 228. Further, the timed URL generation unit 226 generates a timed URL for transmitting the selection screen data (S240). The timed URL is a URL that can be accessed only by the authenticated communication terminal 300, and the expiration date is predetermined. Next, the timed URL generation unit 226 transmits the timed URL to the communication terminal 300 corresponding to the input terminal ID via the transmission unit 228 (S250).

  The timed URL receiving unit 306 of the communication terminal 300 receives the timed URL from the data server 200 and outputs it to the electronic data receiving unit 308. The electronic data receiving unit 308 requests selection screen data from the data server 200 using the timed URL according to the input made by the user to the input unit 302. Next, the transmission unit 228 of the data server 200 transmits the selection screen data to the communication terminal 300 (S255).

  The electronic data receiving unit 308 of the communication terminal 300 receives the selection screen data from the data server 200, displays the selection screen on the display unit 310 using the received selection screen data (S260), and makes the user recognize it. The user selects and inputs the title name of electronic data to be used via the input unit 302 (S270). The electronic data receiving unit 308 transmits first request information indicating that the selected electronic data is requested to the data server 200 (S280). The first request information includes specific information (for example, a title name) that specifies electronic data.

  When the transmission unit 228 of the data server 200 receives the first request information from the communication terminal 300, the transmission unit 228 transmits the requested electronic data from the electronic data storage unit 250 using the specific information included in the received first request information. read out. The electronic data read here is electronic data in a data format that can be processed by the communication terminal 300 (S290). Next, the transmission unit 228 transmits the read electronic data to the communication terminal 300 (S300).

  The electronic data receiving unit 308 of the communication terminal 300 receives the electronic data transmitted from the data server 200 and displays it on the display unit 310 (S310). The user checks the display on the display unit 310 to confirm whether or not the electronic data is acceptable, and inputs data indicating the confirmation result via the input unit 302.

  When information indicating that the displayed electronic data is acceptable is input to the input unit 302 (S320: Yes), the electronic data receiving unit 308 indicates that electronic data in a data format used by the display device 500 is requested. The second request information is transmitted to the data server 200 (S330). When information indicating that the electronic data is not displayed is input (S320: No), the electronic data receiving unit 308 returns to S260.

  When receiving the second request information, the transmission unit 228 of the data server 200 reads out electronic data in a data format used by the display device 500 from the electronic data storage unit 250 (S340). Next, the transmission unit 228 transmits the read electronic data to the communication terminal 300 (S350).

  The electronic data receiving unit 308 of the communication terminal 300 receives the electronic data transmitted from the data server 200 and outputs it to the encryption unit 312. The encryption unit 312 encrypts the input electronic data (S360), and writes it to the removable media 60 held by the removable media holding unit 315 (S370). As a result, at least one encrypted data is written in the removable medium 60.

  FIG. 9 is a flowchart illustrating an example of processing when the encrypted data written in the removable medium 60 held by the communication terminal 300 is displayed on the display device 500 using the data output device 400. First, the user inputs an instruction to display encrypted data stored in the removable medium 60 to the input unit 302 of the communication terminal 300 (S410). Then, the transmission unit 316 reads the encrypted data from the removable medium 60 (S420) and transmits it to the data output device 400 (S430). When a plurality of encrypted data are stored in the removable medium 60, the transmission unit 316 may transmit the plurality of encrypted data to the data output device 400 at a time.

  The receiving unit 402 of the data output device 400 receives the encrypted data from the communication terminal 300 and outputs it to the decrypting unit 404. The decryption unit 404 decrypts the input encrypted data into electronic data (S440), and outputs the decrypted electronic data to the RAM control unit 406. The RAM control unit 406 stores the input electronic data in the RAM 407 (S450). When a plurality of encrypted data is input from the communication terminal 300, the data output device 400 may perform the processes of S440 and S450 on the plurality of encrypted data at a time. Then, the output unit 408 appropriately reads out the electronic data from the RAM 407, outputs the electronic data to the display device 500, and displays the electronic data (S460).

  When ending the display of electronic data, the user inputs a display end command to the input unit 302 of the communication terminal 300 (S470). Then, the transmission unit 316 transmits a display end command to the data output device 400 (S480).

  The receiving unit 402 of the data output device 400 receives a display end command from the communication terminal 300. Then, the reception unit 402 outputs a display end command to the RAM control unit 406 and the output unit 408. When the display end command is input, the output unit 408 ends the output of electronic data (S490). The RAM control unit 406 erases the electronic data from the RAM 407 when a display end command is input (S500). When a plurality of electronic data are stored in the RAM 407, this erasure may be performed in units of electronic data or may be performed on a plurality of electronic data at once. When the RAM 407 is a DRAM, this erasure may be, for example, not performing the refresh process of the RAM 407.

  The writing unit 314 may appropriately delete the encrypted data stored in the removable medium 60 in accordance with a command input to the input unit 302 of the communication terminal 300. A specific example of this erasure will be described. When the communication terminal 300 is, for example, a mobile communication terminal, the communication terminal 300 needs to launch application software in order to perform electronic data display processing. Here, the writing unit 314 may erase the encrypted data from the removable medium 60 when an instruction to end the application software is input to the input unit 302.

  Next, the effect of this embodiment is demonstrated. First, it becomes unnecessary to carry a personal computer, a removable medium, or a portable terminal that stores electronic data. For this reason, even if a personal computer, a removable medium, or a portable terminal is lost while moving, electronic data does not leak.

  The communication terminal 300 encrypts the electronic data received from the data server 200 to generate encrypted data, and stores the encrypted data in the removable medium 60. At this time, the communication terminal 300 does not store electronic data. For this reason, the possibility of leakage of electronic data is further reduced.

  In addition, the communication terminal 300 outputs encrypted data, not electronic data, to the data output device 400. For this reason, the possibility of leakage of electronic data is further reduced.

  The data output device 400 has a function of decrypting encrypted data, but the communication terminal 300 does not have a function of decrypting encrypted data. For this reason, even if the removable terminal 60 loses the communication terminal 300 in a state where the encrypted data is stored, the possibility of leakage of electronic data is low.

  In addition, the data output device 400 stores the decrypted electronic data in the RAM 407. For this reason, the electronic data stored in the RAM 407 is surely erased when the power of the data output device 400 is turned off without performing special erasure processing. Therefore, the possibility of leakage of electronic data is further reduced.

  The writing unit 314 of the communication terminal 300 erases the encrypted data from the removable medium 60 when the communication terminal 300 ends the application software for performing the electronic data display process, for example. Therefore, the possibility of leakage of electronic data is further reduced.

  Further, the process of transmitting electronic data from the data server 200 to the communication terminal 300 can be performed via a public communication line such as a mobile communication network. Further, the communication terminal 300 can be realized by incorporating necessary software into a commercially available mobile communication terminal. Therefore, the construction cost of the data output system is low.

  In addition, the communication terminal 300 stores encrypted data in the removable medium 60. For this reason, it is not necessary to provide a large-capacity storage unit in the communication terminal 300, and a commercially available mobile communication terminal can be used as the communication terminal 300.

  FIG. 10 is a diagram illustrating a configuration of a data output system according to the second embodiment. This data output system is the same as that of the first embodiment except that the data output device 400 has the function of a display device and does not have the display device 500 shown in FIG. . Hereinafter, the same components as those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  FIG. 11 is a block diagram illustrating a functional configuration of the data output device 400 according to the present embodiment. The data output device 400 includes the display unit 410, and the data output device 400 according to the first embodiment except that the output unit 408 outputs and displays electronic data on the display unit 410. It is the same composition as.

  The operation of the data output system according to the present embodiment is the same as the operation of the data output device according to the first embodiment except that the output unit 408 outputs electronic data to the display unit 410 for display. The description is omitted.

  According to this embodiment, the same effect as that of the first embodiment can be obtained. Further, electronic data can be displayed using the data output device 400 even in a place without a display device.

As mentioned above, although embodiment of this invention was described with reference to drawings, these are the illustrations of this invention, Various structures other than the above are also employable. For example, even if the data output device 400 is provided with a function of reading information from the removable medium 60 and the removable media 60 is extracted from the communication terminal 300 and moved to the data output device 400, the encrypted data may be moved to the data output device 400. Good.
In addition, according to embodiment mentioned above, the following invention is disclosed.
(Appendix 1)
A data server storing electronic data;
A communication terminal for receiving the electronic data from the data server via a communication line;
A data output device that outputs the electronic data received by the communication terminal to allow the user to recognize the electronic data;
With
The data server is
Data storage means for storing the electronic data;
Transmitting means for transmitting the electronic data to the communication terminal;
Have
The communication terminal is
Receiving means for receiving the electronic data;
Encryption means for generating encrypted data by encrypting the electronic data;
A communication terminal side output means for outputting the encrypted data;
Have
The data output device includes:
Obtaining means for obtaining the encrypted data;
Decryption means for decrypting the encrypted data into the electronic data;
Output device side output means for outputting the decrypted electronic data;
A data output system comprising:
(Appendix 2)
In the data output system described in Appendix 1,
The data output device includes output device storage means for storing the decrypted electronic data and erasing the electronic data when the data output device is turned off.
The output device side output means reads out and outputs the electronic data from the output device side storage means.
(Appendix 3)
In the data output system described in Appendix 2,
A data output system in which the output device side storage means is a RAM.
(Appendix 4)
In the data output system according to any one of appendices 1 to 3,
The communication terminal is
Terminal side storage means;
Writing means for storing the encrypted data in the terminal-side storage means;
With
The communication terminal-side output means reads out the encrypted data from the terminal-side storage means and outputs it to the data output device.
(Appendix 5)
In the data output system described in Appendix 4,
The communication line includes a public wireless communication network,
The communication terminal is a mobile communication terminal,
The terminal-side storage means is a data output system that is a removable medium.
(Appendix 6)
In the data output system according to appendix 4 or 5,
The data output system, wherein the communication terminal includes an erasing unit that erases the encrypted data from the terminal-side storage unit.
(Appendix 7)
In the data output system according to any one of appendices 1 to 6,
The electronic data is image data;
The output device side output means is a data output system for outputting the electronic data to an external image display device.
(Appendix 8)
In the data output system according to any one of appendices 1 to 6,
The electronic data is image data;
The data output device has display means for displaying the electronic data,
The output device side output means is a data output system for outputting the electronic data to the display means.
(Appendix 9)
Receiving means for receiving the electronic data from a data server storing the electronic data via a communication line;
Encryption means for generating encrypted data by encrypting the electronic data;
Encrypted data output means for outputting the encrypted data to a data output device having decryption means;
A communication terminal comprising:
(Appendix 10)
Encrypted data receiving means for receiving encrypted data generated by encrypting electronic data by the communication terminal from a communication terminal ;
Decryption means for decrypting the encrypted data into the electronic data;
An output means for outputting the decrypted electronic data to make the user recognize;
A data output device comprising:
(Appendix 11)
In the data output device according to attachment 10,
Storing the decrypted electronic data, and storing means for erasing the electronic data when the power of the data output device is turned off,
The output means is a data output device that reads out and outputs the electronic data from the storage means.
(Appendix 12)
In the data output device according to attachment 11,
A data output device wherein the storage means is a RAM.
(Appendix 13)
A communication terminal receiving the electronic data from a data server storing electronic data via a communication line;
The communication terminal encrypting the electronic data to generate encrypted data;
A data output device obtaining the encrypted data;
The data output device decrypting the encrypted data into the electronic data;
The data output device outputting the electronic data to allow a user to recognize;
A data output method comprising:
(Appendix 14)
A program executable on a communication terminal, the communication terminal
A function of receiving the electronic data from a data server storing the electronic data via a communication line ;
A function of generating encrypted data by encrypting the electronic data;
A function of outputting the encrypted data to a data output device having decryption means;
A program that realizes
(Appendix 15)
A program executable by the data output device, the data output device
A function of receiving encrypted data generated by the communication terminal encrypting electronic data from the communication terminal;
A function of decoding the previous SL encrypted data to the electronic data,
A function of outputting the decrypted electronic data for the user to recognize;
A program that realizes

It is a block diagram which shows the structure of the data output system in 1st Embodiment. It is a block diagram which shows an example of a function structure of a data server. It is a figure which shows an example of a data structure of the data which the authentication data storage part has memorize | stored. It is a figure which shows an example of the data structure of the data which the electronic data storage part has memorize | stored. It is a block diagram which shows an example of a function structure of a communication terminal. It is a block diagram which shows an example of a function structure of a data output device. It is a flowchart which shows an example of operation | movement of a data processing system when a user memorize | stores electronic data in a data server. It is a flowchart which shows an example of a process when a user transmits electronic data from a data server to a communication terminal. It is a flowchart which shows an example of a process when displaying the encryption data written in the removable medium with a display apparatus using a data output device. It is a figure which shows the structure of the data output system concerning 2nd Embodiment. It is a block diagram which shows the function structure of the data output device concerning 2nd Embodiment.

Explanation of symbols

50 communication line 60 removable media 100 in-house terminal 200 data server 202 internal ID reception unit 204 internal authentication processing unit 206 registration processing unit 222 external ID reception unit 224 external authentication processing unit 226 timed URL generation unit 228 transmission unit 240 authentication data storage unit 250 Electronic data storage unit 300 Communication terminal 302 Input unit 304 ID transmission unit 306 Timed URL reception unit 308 Electronic data reception unit 310 Display unit 312 Encryption unit 314 Writing unit 315 Removable media holding unit 316 Transmission unit 318 Terminal ID storage unit 400 Data Output device 402 Reception unit 404 Decoding unit 406 RAM control unit 407 RAM
408 Output unit 410 Display unit 500 Display device

Claims (11)

A data server storing electronic data;
A communication terminal for receiving the electronic data from the data server via a communication line;
A data output device that outputs the electronic data received by the communication terminal to allow the user to recognize the electronic data;
With
The data server is
Data storage means for storing the electronic data;
Transmitting means for transmitting the electronic data to the communication terminal;
Have
The communication terminal is
Receiving means for receiving the electronic data;
Encryption means for generating encrypted data by encrypting the electronic data;
A communication terminal side output means for outputting the encrypted data;
And no decryption means for decrypting the encrypted data,
The data output device includes:
Obtaining means for obtaining the encrypted data;
Decryption means for decrypting the encrypted data into the electronic data;
Output device side output means for outputting the decrypted electronic data;
A data output system comprising: The data output system according to claim 1,
The data output device includes an output device-side storage unit that stores the decrypted electronic data and that erases the electronic data when the power of the data output device is turned off.
The output device side output means reads out and outputs the electronic data from the output device side storage means. The data output system according to claim 2,
A data output system in which the output device side storage means is a RAM. In the data output system according to any one of claims 1 to 3,
The communication terminal is
Terminal side storage means;
Writing means for storing the encrypted data in the terminal-side storage means;
With
The communication terminal-side output means reads out the encrypted data from the terminal-side storage means and outputs it to the data output device. The data output system according to claim 4, wherein
The communication line includes a public wireless communication network,
The communication terminal is a mobile communication terminal,
The terminal-side storage means is a data output system that is a removable medium. The data output system according to claim 4 or 5,
The data output system, wherein the communication terminal includes an erasing unit that erases the encrypted data from the terminal-side storage unit. In the data output system according to any one of claims 1 to 6,
The electronic data is image data;
The output device side output means is a data output system for outputting the electronic data to an external image display device. In the data output system according to any one of claims 1 to 6,
The electronic data is image data;
The data output device has display means for displaying the electronic data,
The output device side output means is a data output system for outputting the electronic data to the display means. Receiving means for receiving the electronic data from a data server storing the electronic data via a communication line;
Encryption means for generating encrypted data by encrypting the electronic data;
Encrypted data output means for outputting the encrypted data to a data output device having decryption means;
And a communication terminal that does not include decryption means for decrypting the encrypted data . A communication terminal receiving the electronic data from a data server storing electronic data via a communication line;
The communication terminal having no function of decrypting the encrypted data generates the encrypted data by encrypting the electronic data;
A data output device obtaining the encrypted data;
The data output device decrypting the encrypted data into the electronic data;
The data output device outputting the electronic data to allow a user to recognize;
A data output method comprising: A program executable on a communication terminal, the communication terminal
A function of receiving the electronic data from a data server storing the electronic data via a communication line;
A function of generating encrypted data by encrypting the electronic data;
A function of outputting the encrypted data to a data output device having decryption means;
And a program that does not realize the function of decrypting the encrypted data .

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