JP2006270492A - Data management device, data management method, data management program and data management system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide information for proving the transmitter of communication data that the transmitter himself has transmitted the communication data to a receiver, for instance. <P>SOLUTION: In this data management device 100, a composite information generating part 105 combines time information, change information due to the passage of time and the e-mail address of the transmitter and generates composite information. The composite information is added to the header of e-mail and transmitted to a receiver terminal by a transmitter terminal. For inquiry by the composite information from the receiver terminal, a communication data output part 109 retrieves an e-mail body and the e-mail address of the transmitter corresponding to the composite information, and the retrieved e-mail main body and the e-mail address and the time information used by the composite information generating part 105 so as to generate the composite information are outputted. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a data management device, a data management method, a data management program, and a data management system.

  In recent years, e-mail (E-Mail) has been actively used in personal computers (PCs), mobile phones, and the like, but has become a social problem due to the appearance of virus attacks. In particular, what is called spoofed mail is not only pretending to be a PC user infected with a virus and sending virus mail to a third party, but also mail stored in the address book on the PC infected with the virus. Some have appeared that send mail to a third party by pretending that the address or the mail address attached to the e-mail stored in the inbox is the sender. In this case, the user who received the spoofed email is likely to be regarded as having received a virus from the sender of the email, so that the user whose address is spoofed by the spoofed email is recognized as a virus distributor and loses its trust. It can also be. As a countermeasure against such spoofing mail, there is a method in which a user installs a virus detection / disinfection program on his / her own PC, but his / her own mail can be sent from an e-mail stored in an address book or inbox on another person's PC. It is not possible to take active measures for obtaining an address.

In order to prove the contents of an e-mail, in the conventional method, the sender device encrypts the e-mail with a public key encryption private key and sends it, or the mediator device receives the e-mail and receives the received e-mail. Is encrypted with a secret key, and the electronic mail is transmitted to a designated transfer destination (see, for example, Patent Document 1).
JP 11-261549 A JP 2001-297062 A

  In the conventional method, there has been a problem that encryption processing with a large amount of processing must be performed on the e-mail sender or mediator side. Furthermore, there is a problem that the recipient of the email must perform a decryption process with a large amount of processing, and obtain or hold the public key of the sender or intermediary each time an email is received. It was.

  An object of the present invention is, for example, to provide information for proving that a sender of communication data has transmitted the communication data to the receiver.

The data management apparatus of the present invention
In a data management device that connects a sender terminal that transmits communication data and a receiver terminal that receives the communication data, and manages the communication data,
An authentication database for storing authentication information for authenticating the caller terminal;
A caller database for storing caller information about a caller sending communication data;
A communication database for storing communication data in association with caller information related to the communication data;
An input unit for inputting time information indicating the time and time-dependent change information that changes with the passage of time;
A caller authentication unit that authenticates the caller terminal based on authentication information stored in the authentication database;
A communication data receiving unit that receives communication data together with caller information from a caller terminal authenticated by the caller authentication unit;
A caller information storage unit that stores the caller information received by the communication data reception unit in the caller database;
Synthesizing information generation for synthesizing time information input by the input unit, time-change information, and sender information stored by the sender information storage unit, and generating composite information for the communication data received by the communication data receiving unit And
Along with the synthesis information generated by the synthesis information generation unit, a communication data storage unit that stores the communication data received by the communication data reception unit in the communication database;
A synthesis information output unit that outputs the synthesis information stored by the communication data storage unit;
In response to the inquiry by the composite information output from the composite information output unit from the receiver terminal, the communication data corresponding to the composite information is searched from the communication database, and the caller corresponding to the communication data from the caller database A communication data output unit that searches for information and outputs the searched communication data, sender information, and time information used by the combined information generation unit to generate the combined information is provided.

  In the present invention, in the data management device, the caller authentication unit authenticates the caller terminal that transmits the communication data, and the communication data reception unit combines the caller information from the caller terminal authenticated by the caller authentication unit. The sender that received the communication data, the sender information storage unit saved the sender information received by the communication data receiver, and the synthesized information generation unit saved the time information, time-varying information, and the sender information storage unit The communication data received by the communication data receiving unit is generated by combining the information with the communication data received by the communication data receiving unit, and the communication data storage unit receives the communication information received by the communication data receiving unit together with the synthesized information generated by the synthesized information generating unit. The composite information output unit outputs the composite information stored by the communication data storage unit, and the communication data output unit outputs the composite information output by the composite information output unit from the receiver terminal that receives the communication data. Search for communication data corresponding to the combined information, search for caller information corresponding to the communication data, and generate combined information to generate the searched communication data, caller information, and the combined information By outputting the time information used by the section, it becomes possible for the sender of the communication data to provide information for certifying that the sender of the communication data is transmitted to the receiver.

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

  FIG. 1 is a diagram illustrating an example of an appearance of a data management apparatus according to the following embodiment.

  In FIG. 1, a data management apparatus 100 includes a system unit 910, a CRT (Cathode Ray Tube) display device 901, a keyboard (K / B) 902, a mouse 903, a compact disk device (CDD) 905, a printer device 906, and a scanner device 907. These are connected by a cable. Further, the data management apparatus 100 is connected to the FAX machine 932 with a cable, and is connected to the Internet 940 via a local area network (LAN) 942 and a gateway 941.

  FIG. 2 is a diagram illustrating an example of a hardware configuration of a data management apparatus according to the following embodiment.

  In FIG. 2, the data management apparatus 100 includes a CPU (Central Processing Unit) 911 that executes a program. The CPU 911 includes a ROM 913, a RAM 914, a communication board 915, a CRT display device 901, a K / B 902, a mouse 903, an FDD (Flexible Disk Drive) 904, a magnetic disk device 920, a CDD 905, a printer device 906, and a scanner device 907. Connected with.

  The RAM 914 is an example of a volatile memory. The ROM 913, the FDD 904, the CDD 905, and the magnetic disk device 920 are examples of nonvolatile memories. These are examples of a storage device or a storage unit.

  The communication board 915 is connected to a FAX machine 932, a LAN 942, and the like.

  For example, the communication board 915, the K / B 902, the scanner device 907, the FDD 904, and the like are examples of the input unit. In addition, for example, the communication board 915, the CRT display device 901, and the like are examples of what is described as “to output unit” in the description of the embodiment described below.

  Here, the communication board 915 is not limited to the LAN 942 and may be directly connected to the Internet 940 or a WAN (Wide Area Network) such as ISDN (Integrated Services Digital Network). When directly connected to the WAN such as the Internet 940 or ISDN, the data management apparatus 100 is connected to the WAN such as the Internet 940 or ISDN, and the gateway 941 is unnecessary.

  The magnetic disk device 920 stores an operating system (OS) 921, a window system 922, a program group 923, and a file group 924. The program group 923 is executed by the CPU 911, the OS 921, and the window system 922.

  The program group 923 stores programs that execute functions described as “˜units” in the description of the embodiments described below. The program is read and executed by the CPU 911.

  In the file group 924, what is described as “determination result of”, “calculation result of”, and “processing result of” in the description of the embodiment described below is stored as “˜file”. Yes. A part of the file group 924 constitutes a database.

  In addition, the arrow portion of the flowchart described in the description of the embodiment described below mainly indicates input / output of data, and for the input / output of the data, the data is a magnetic disk device 920, an FD (Flexible Disk), an optical disk. , CD (compact disc), MD (mini disc), DVD (Digital Versatile Disk) and other recording media. Alternatively, it is transmitted through a signal line or other transmission medium.

  In addition, what is described as “unit” in the description of the embodiment described below may be realized by firmware stored in the ROM 913. Alternatively, it may be implemented by software alone, hardware alone, a combination of software and hardware, or a combination of firmware.

  A program for implementing the embodiment described below includes other recordings such as a magnetic disk device 920, an FD (Flexible Disk), an optical disk, a CD (compact disk), an MD (mini disk), and a DVD (Digital Versatile Disk). You may memorize | store using the recording apparatus by a medium.

  Hereinafter, each embodiment will be described using e-mail as an example of communication data transmitted from a sender to a receiver. However, the communication data is other types of communication data such as FAX data and electronic files. May be. In addition, each embodiment will be described using an e-mail address as an example of caller information regarding a caller, but other types of information such as a caller's name, user name, and telephone number may be used.

Embodiment 1 FIG.
FIG. 3 is a diagram showing an example of the configuration of the data management system according to the present embodiment.

  The data management system includes a data management device 100, a sender terminal 200, a sender mail server 250, a receiver terminal 300, a receiver mail server 350, a network 400, and the like.

  The data management apparatus 100 is installed in the mail management center and is connected to the network 400. The data management devices 100 may be installed in a distributed manner, and in that case, mail management centers may be laid at a plurality of locations.

  The caller terminal 200 is a device connected to the network 400 and used by the caller to send an e-mail, such as a personal computer, a PDA (Personal Digital Assistant), or a mobile phone. The caller terminal 200 communicates with the data management apparatus 100 directly or via the mail server 250. Similarly, the recipient terminal 300 is a device that is connected to the network 400 and is used by the recipient to receive an e-mail, such as a personal computer, a PDA, or a mobile phone. The recipient terminal 300 communicates with the data management apparatus 100 directly or via the mail server 350. The sender terminal 200 and the receiver terminal 300 may be the same device, or a plurality of each may exist.

  The network 400 is a LAN, WAN, the Internet, or a combination thereof, or other communication network, regardless of whether it is wired or wireless.

  FIG. 4 is a block diagram showing a configuration of the data management apparatus according to the present embodiment.

  The data management apparatus 100 includes an input unit 101, a caller authentication unit 102, a communication data reception unit 103, a caller information storage unit 104, a composite information generation unit 105, a communication data storage unit 106, a composite information output unit 107, and a time information output. Unit 108, communication data output unit 109, outgoing data reception unit 110, and comparison result output unit 111. Further, the data management apparatus 100 includes an authentication database 112, a sender database 113, and a communication database 114. These databases may be mounted on, for example, a plurality of disk devices, each may be mounted on one disk device, or all may be mounted on one disk device.

  The authentication database 112 stores authentication information for authenticating the caller terminal 200. The authentication information is, for example, an e-mail address, a combination of ID, ID and password, a MAC (Media Access Control) address, an IP (Internet Protocol) address, an electronic certificate, and the like, and is registered in the authentication database 112 in advance. The sender database 113 stores the sender's e-mail address. The communication database 114 stores the text of the email and the attached file (hereinafter referred to as the email body) in association with the email address of the sender of the email. Here, the communication database 114 may store an electronic mail itself including a header.

  The input unit 101 inputs time information indicating time and temporal change information that changes with the passage of time. The time information is, for example, the current time, and the temporal change information is, for example, the latest weather image at that time taken by the weather satellite.

  The caller authentication unit 102 authenticates the caller terminal 200 based on the authentication information stored in the authentication database 112. The communication data receiving unit 103 receives an e-mail from the caller terminal 200 authenticated by the caller authentication unit 102. In the header of this email, the sender's email address is shown as the sender of the email, and the recipient's email address is shown as the sender. The sender information storage unit 104 stores the sender's e-mail address received by the communication data receiver 103 in the sender database 113.

  The composite information generation unit 105 combines the time information input by the input unit 101, the time-change information, and the e-mail address stored by the sender information storage unit 104, and synthesizes the e-mail received by the communication data reception unit 103. Generate information. The combination information may be, for example, a hash value of data obtained by combining a hash value of combined data or a hash value of data combined with time information and time-change information, and an email address. As a method for generating synthesis information, for example, the method disclosed in Patent Document 2 can be used.

  The communication data storage unit 106 stores the electronic mail body received by the communication data receiving unit 103 in the communication database 114 together with the combination information generated by the combination information generation unit 105. The communication data storage unit 106 may encrypt the e-mail body when the e-mail body is stored in the communication database 114.

  The composite information output unit 107 outputs the composite information stored by the communication data storage unit 106 to the caller terminal 200. The time information output unit 108 outputs to the caller terminal 200 the time information used by the composite information generation unit 105 to generate the composite information output by the composite information output unit 107. The output composite information and time information are added to the header of the email by the sender terminal 200 and transmitted to the receiver terminal 300. The communication data output unit 109 searches the communication database 114 for an electronic mail body corresponding to the composite information in response to the inquiry based on the composite information from the receiver terminal 300, and sends the outgoing mail corresponding to the electronic mail body from the sender database 113. The user's e-mail address is searched, and the searched e-mail body, e-mail address, and time information used by the combined information generation unit 105 to generate the combined information are output. When the communication data storage unit 106 encrypts and stores the email body, the communication data output unit 109 decrypts the email body retrieved from the communication database 114 and outputs the decrypted email body.

  Here, the communication data output unit 109 may output the temporal change information used by the composite information generation unit 105 to generate the composite information in response to the inquiry by the composite information from the receiver terminal 300.

  The outgoing data receiving unit 110 receives an email sent from the sender terminal 200 to the receiver terminal 300 from the receiver terminal 300. This e-mail is added with the sender's e-mail address, composition information, and time information. The comparison result output unit 111 sends, to the receiver terminal 300, the e-mail body received by the outgoing data receiving unit 110, the e-mail address and time information of the sender, the e-mail main body output by the communication data output unit 109, the electronic Compare the mail address and time information and output the comparison result.

  Here, instead of receiving the e-mail sent from the sender terminal 200 to the receiver terminal 300 by the sender data receiving unit 110 from the receiver terminal 300, the communication data output unit 109 The e-mail body, e-mail address, and time information may be output. In this case, instead of the comparison result output unit 111, the receiver terminal 300 receives the email main body, the sender's email address, time information received from the sender terminal 200, and the email output by the communication data output unit 109. Compare the main body, e-mail address, and time information.

  FIG. 5 is a block diagram showing the configuration of the sender terminal and the receiver terminal according to the present embodiment.

  The caller terminal 200 includes a first transmitter 201 and a second transmitter 202. Each unit is implemented in electronic mail communication software (hereinafter referred to as mail software).

  The first sending unit 201 sends an e-mail that the sender wants to send to the receiver to the communication data receiving unit 103 of the data management device 100. The second sending unit 202 writes the sender's email address in the email header as the sender. In addition, the second transmission unit 202 writes the time information output from the time information output unit 108 of the data management device 100 as a transmission time or a certification time in the header of the electronic mail or the main body of the electronic mail, and synthesizes the data management device 100. The composite information output by the information output unit 107 is written in the header of the email or the email body. Then, the electronic mail is transmitted to the recipient terminal 300.

  The recipient terminal 300 includes a receiving unit 301, an inquiry unit 302, and an output unit 303. Each unit is implemented in mail software in the same manner as the caller terminal 200.

  The receiving unit 301 receives an e-mail from the second transmitting unit 202 of the caller terminal 200. The e-mail address of the sender, time information, and composite information are added to the e-mail. The inquiry unit 302 makes an inquiry to the communication data output unit 109 of the data management device 100 by the composite information added to the email received by the reception unit 301, and sends the inquiry to the outgoing data reception unit 110 of the data management device 100. The receiving unit 301 transmits the received e-mail. The output unit 303 outputs the email main body, the sender's email address, and time information received by the receiving unit 301 based on the comparison result output by the comparison result output unit 111 of the data management apparatus 100.

  For example, when the comparison result output from the comparison result output unit 111 of the data management apparatus 100 indicates that the compared data matches, the output unit 303 indicates that the e-mail body and the e-mail address of the sender And time information are displayed on the screen. When the communication data output unit 109 of the data management apparatus 100 outputs the temporal change information, the output unit 303 further displays the temporal change information on the screen. For example, if the comparison result output from the comparison result output unit 111 of the data management apparatus 100 indicates that the compared data does not match, the caller terminal 200 refuses to receive the email. Notify you.

  FIG. 6 is a sequence diagram showing an example of a communication procedure of the data management system in the present embodiment. In this example, the composite information generation unit 105 of the data management apparatus 100 represents, as composite information, a hash value of data obtained by compositing time information, time-varying information, and the sender's e-mail address as a code composed of characters and numbers. Shall.

  First, the sender operates the mail software to create a mail (e-mail) text (attached file or the like may be added), and requests that the mail text be sent to the recipient. The sender's mail software (sender terminal 200) requests the mail management center (data management apparatus 100) to issue a code. At this time, the mail software on the caller side transmits the mail address of the caller and the text of the mail to the mail management center. Next, the mail management center issues a code using the sender's mail address. At this time, the mail management center stores the mail address of the caller, the text of the mail, and the issued code. The mail software on the sender side adds a code to the mail, transmits the mail to the recipient, and notifies the sender that the mail transmission is completed.

  The mail software (recipient terminal 300) on the receiver side receives the mail and inquires of the caller by the code added to the received mail. At this time, the mail software on the receiver side transmits the mail address of the sender and the text of the mail indicated in the received mail to the mail management center. Next, the mail management center compares the mail address received from the mail software on the receiver side with the mail address of the caller inquired by the code, and proves the legitimacy of the caller. Compare the text of the email received from the email software with the text of the email inquired by the code, and check whether the email has been tampered with.

  The mail software on the receiver side displays the text of the mail to the receiver when the sender's validity is proved and the mail has not been tampered with. If the sender's legitimacy is not proved or the mail is falsified, a rejection mail is sent to the sender's mail software in order to notify that the mail is rejected. The mail software on the caller side notifies the caller that reception of the mail has been refused.

  In this way, for example, if there is a means to prove that the mail is correctly sent to the mail sent by the caller, the person who does not attach the proof to the other person By widely declaring that mail from is not sent by you, you can increase the credibility of the recipient. In addition, for example, when the recipient checks the certification information at the time of reception, it is possible to prevent virus infection by spoofed mail. Furthermore, for example, in an organization such as a company, all the PCs are equipped with the certification means as described above, and by declaring widely that outgoing information from the organization's domain always includes certification information, It becomes possible to increase the trustworthiness.

  Further, when the mail software requests the mail management center to issue a code, a password operator or biometric authentication may be requested to the operator of the PC executing the mail software. As a result, it is possible to prevent the transmission of spoofed mail that deceives the user of the PC.

  In the above example, it was assumed that the mail software on the receiving side knew in advance that the mail software on the calling side was using the above code. Whether or not the mail software on the caller side supports the use of the code as described above can be easily confirmed based on whether or not there is a history of receiving a mail with a code from the same sender in the past. In addition, by referring to the mail address of the caller at the mail management center, it is possible to easily confirm whether the caller supports the use of the code (whether registered at the mail management center).

  FIG. 7 is a sequence diagram showing an example of a communication procedure of the data management system in the present embodiment, as in FIG. However, in the example of FIG. 7, it is assumed that the mail software on the receiving side does not have a function of using a code.

  The procedure until the caller is notified by the mail software that the transmission of mail has been completed is the same as the example of FIG.

  When the sender's email software adds a code to the email and sends the email to the recipient, the recipient's email software receives the email and sends the body of the email to the recipient. indicate. At this time, for example, it is assumed that a code is added to the body of the mail and the code is displayed to the recipient. The recipient uses a web browser, for example, to inquire of the caller from the website of the mail management center using a code added to the mail. At this time, the receiver transmits the mail address of the sender and the text of the mail indicated in the received mail to the mail management center. Next, the mail management center compares the mail address received from the mail software on the receiver side with the mail address of the caller inquired by the code, and proves the legitimacy of the caller. Compare the text of the email received from the email software with the text of the email inquired by the code, and check whether the email has been tampered with.

  The mail software on the recipient's side notifies the mail software to send a rejection mail in order to notify that the mail is rejected if the sender's legitimacy is not proved or the mail is falsified. Request. The mail software on the receiver side transmits to the mail software on the sender side. The mail software on the caller side notifies the caller that reception of the mail has been refused.

  8 and 9 are flowcharts showing the operation of the data management system according to the present embodiment.

  First, in the data management apparatus 100, the caller authentication unit 102 authenticates the caller terminal 200 based on the authentication information stored in the authentication database 112 (step S101: caller authentication step / caller authentication process).

  Next, in the caller terminal 200, the first sending unit 201 sends an e-mail to the communication data receiving unit 103 of the data management device 100. (Step S201).

  Next, in the data management apparatus 100, the communication data receiving unit 103 receives an e-mail (including the e-mail address of the caller and the e-mail body) from the caller terminal 200 authenticated by the caller authentication unit 102. (Step S102: Communication data reception step / communication data reception process). The sender information storage unit 104 stores the sender's e-mail address received by the communication data receiving unit 103 in the sender database 113 (step S103: sender information storage step / sender information storage process). The input unit 101 inputs time information indicating time and time-varying information that changes with the passage of time (step S104: input step / input processing). The composite information generation unit 105 combines the time information input by the input unit 101, the time-change information, and the e-mail address stored by the sender information storage unit 104, and synthesizes the e-mail received by the communication data reception unit 103. Information is generated (step S105: synthesis information generation step / synthesis information generation process). The communication data storage unit 106 stores the electronic mail body received by the communication data receiving unit 103 in the communication database 114 together with the composite information generated by the composite information generation unit 105 (step S106: communication data storage step / communication data). Save processing).

  Next, in the data management apparatus 100, the composite information output unit 107 outputs the composite information stored by the communication data storage unit 106 to the caller terminal 200 (step S107: composite information output step / composite information output process). ). The time information output unit 108 outputs to the caller terminal 200 the time information used by the composite information generation unit 105 to generate the composite information output by the composite information output unit 107 (step S108: time information output). Step / time information output processing).

  Then, in the sender terminal 200, the second transmitter 202 writes the composite information output by the composite information output unit 107 of the data management device 100 into the header of the email or the email body (step S202), and manages the data. The time information output by the time information output unit 108 of the device 100 is written in the header of the electronic mail or the main body of the electronic mail as a transmission time or a certification time (step S203). The second sending unit 202 writes the sender's email address in the email header as the sender, and sends the email to the recipient terminal 300 (step S204).

  Next, in the receiver terminal 300, the receiver 301 receives an e-mail (the sender's e-mail address, time information, and composite information are added) from the second transmitter 202 of the sender terminal 200. Receive (step S301). The inquiry unit 302 makes an inquiry to the communication data output unit 109 of the data management apparatus 100 using the composite information added to the email received by the reception unit 301 (step S302).

  Next, in the data management apparatus 100, the communication data output unit 109 searches the communication database 114 for an email body corresponding to the combined information in response to the inquiry based on the combined information from the recipient terminal 300 (step S109). The sender information 113 is searched for the sender's email address corresponding to the email body from the sender database 113 (step S110), and the combined information generation unit 105 generates the searched email body, email address, and the combined information. The used time information is output (step S111) (steps S109 to S111: communication data output step / communication data output process).

  Next, in the recipient terminal 300, the inquiry unit 302 transmits the email received by the reception unit 301 to the outgoing data reception unit 110 of the data management device 100 (step S303).

  Next, in the data management apparatus 100, the outgoing data receiving unit 110 receives an email sent from the sender terminal 200 to the receiver terminal 300 from the receiver terminal 300 (step S112: outgoing data reception step / outgoing data). Receive processing). The comparison result output unit 111 sends, to the receiver terminal 300, the e-mail body received by the outgoing data receiving unit 110, the e-mail address and time information of the sender, the e-mail main body output by the communication data output unit 109, the electronic The mail address and time information are compared (step S113), and the comparison result is output (step S114) (steps S113 and S114: comparison result output step / comparison result output process).

  Finally, in the recipient terminal 300, the output unit 303 indicates that the comparison result output by the comparison result output unit 111 of the data management apparatus 100 indicates that the compared data match (step S304). The e-mail body, the e-mail address of the sender, and time information are displayed on the screen (step S305). For example, if the comparison result output from the comparison result output unit 111 of the data management apparatus 100 indicates that the compared data does not match, the caller terminal 200 refuses to receive the email. To that effect (step S306).

  As described above, in the present embodiment, in the data management device, the caller authentication unit authenticates the caller terminal that transmits the communication data, and the communication data reception unit authenticates the caller terminal that is authenticated by the caller authentication unit. The communication data is received together with the caller information, the caller information storage unit stores the caller information received by the communication data reception unit, and the composite information generation unit includes the time information, time-varying information, and caller information. Combining with the sender information stored by the storage unit, the communication data receiving unit generates composite information for the communication data received, and the communication data storage unit communicates with the composite information generated by the composite information generation unit. The communication data received by the data receiver is stored, the composite information output unit outputs the composite information stored by the communication data storage, and the communication data output unit outputs the composite information from the receiver terminal that receives the communication data. Search for communication data corresponding to the combined information, search for caller information corresponding to the communication data, and generate the searched communication data, caller information, and the combined information By outputting the time information used by the composite information generation unit to provide the information, the sender of the communication data can provide the receiver with information for certifying that the communication data has been sent to the receiver It becomes possible. Furthermore, it is not necessary for the sender and receiver to perform encryption and decryption processing with a large amount of processing.

  In the present embodiment, in the data management device, the transmission data receiving unit receives the communication data transmitted from the caller terminal to the receiver terminal, the caller information added to the communication data, and the time information. The communication result received from the terminal, the comparison result output unit compares the communication data received by the transmission data reception unit with the communication data output by the communication data output unit, and the caller information received by the transmission data reception unit and the communication data output unit The communication received by the receiver by comparing the time information received by the transmission data receiving unit with the time information output by the communication data output unit and comparing the result It becomes possible to confirm the sender of data.

  In the present embodiment, in the data management device, the communication data storage unit encrypts the communication data received by the communication data reception unit, stores the encrypted communication data, and the communication data output unit searches for the communication By decrypting the data and outputting the decrypted communication data, the communication data can be stored more safely.

  Moreover, in this Embodiment, since a time-change information is weather information, it becomes possible to utilize the information which a caller or a receiver can identify easily.

  In the present embodiment, the communication data is an electronic mail, and the sender information includes the sender's electronic mail address, so that it is possible to easily determine or prevent the spoofed mail.

  In the present embodiment, in the data management method, the caller terminal that transmits communication data is authenticated in the caller authentication step, and the caller terminal authenticates in the caller authentication step in the communication data reception step. The communication data is received together with the information, the caller information storage step stores the caller information received in the communication data reception step, the composite information generation step, the time information, the time-varying information, and the caller information storage step Combining the saved caller information with the communication data reception step to generate composite information for the communication data received in the communication data reception step, and the communication data storage step together with the composite information generated in the composite information generation step The communication data received in step 1 is saved, and in the synthesis information output step, the synthesis information saved in the communication data saving step is output. In response to the inquiry by the composite information output in the composite information output step from the receiver terminal that receives the communication data in the communication data output step, the communication data corresponding to the composite information is searched and the transmission corresponding to the communication data The sender of the communication data is sent to the receiver by searching the sender information and outputting the searched communication data, the sender information, and the time information used in the synthesized information generation step to generate the synthesized information. It becomes possible to provide information for proving that the communication data has been transmitted.

  In the present embodiment, in the data management program, the caller authentication process authenticates the caller terminal that transmits the communication data, and the communication data reception process starts from the caller terminal authenticated by the caller authentication process. The communication data is received together with the information, the caller information storage process stores the caller information received by the communication data reception process, the composite information generation process, the time information, the time-change information, and the caller information storage process Combining the saved caller information and generating communication information for the communication data received by the communication data reception process, the communication data storage process is combined with the combination information generated by the synthesis information generation process and the communication data reception process. Stores the communication data received, the composite information output process outputs the composite information stored by the communication data storage process, and the communication data output process receives the communication data. In response to the inquiry by the composite information output by the composite information output process from the follower terminal, the communication data corresponding to the composite information is searched, the caller information corresponding to the communication data is searched, the searched communication data and the caller To prove that the sender of communication data has sent the communication data to the receiver by outputting the information and the time information used by the composite information generation process to generate the composite information It becomes possible to provide the information.

Embodiment 2. FIG.
The configuration of the data management system according to the present embodiment is the same as that of the first embodiment shown in FIG. 3, for example.

  FIG. 10 is a block diagram showing the configuration of the data management apparatus according to this embodiment.

  The data management apparatus 100 includes an input unit 101, a caller authentication unit 102, a communication data reception unit 103, a caller information storage unit 104, a composite information generation unit 105, a communication data storage unit 106, a composite information output unit 107, and a receiver authentication. Unit 115 and communication data output unit 109. The input unit 101, the caller authentication unit 102, the communication data reception unit 103, the caller information storage unit 104, the composite information generation unit 105, and the composite information output unit 107 are the data management apparatus according to the first embodiment shown in FIG. Is the same as Further, the data management apparatus 100 includes an authentication database 112, a sender database 113, and a communication database 114. The sender database 113 and the communication database 114 are the same as those of the data management apparatus according to the first embodiment shown in FIG.

  The authentication database 112 stores authentication information for authenticating the sender terminal 200 and the receiver terminal 300.

  The communication data storage unit 106 encrypts the electronic mail body received by the communication data receiving unit 103, and stores the encrypted electronic mail body in the communication database 114 together with the composite information generated by the composite information generation unit 105. The communication data storage unit 106 may not encrypt the electronic mail body when storing the electronic mail body in the communication database 114.

  The recipient authentication unit 115 authenticates the recipient terminal 300 based on the authentication information stored in the authentication database 112.

  The communication data output unit 109 retrieves an email body corresponding to the composite information from the communication database 114 in response to the inquiry based on the composite information from the receiver terminal 300, decrypts the retrieved electronic mail body, and sends the sender database 113. The sender's e-mail address corresponding to the e-mail body, the decrypted e-mail body, the searched e-mail address, and the time information used by the synthesis information generation unit 105 to generate the synthesis information Is output to the recipient terminal 300 authenticated by the recipient authenticating unit 115. When the communication data storage unit 106 stores the electronic mail body without encryption, the communication data output unit 109 does not need to decrypt the electronic mail body retrieved from the communication database 114. Further, when the receiver terminal 300 receives the composite information from the sender terminal 200 by e-mail, the e-mail address of the sender of the e-mail is acquired from the receiver terminal 300 and compared with the searched e-mail address. Also good. At this time, if the email address acquired from the recipient terminal 300 and the retrieved email address do not match, a warning may be given to the recipient terminal 300.

  The configurations of the sender terminal and the receiver terminal according to the present embodiment are the same as those of the first embodiment shown in FIG.

  The caller terminal 200 includes a first transmitter 201 and a second transmitter 202. Each part is implemented in mail software.

  The first sending unit 201 sends an e-mail that the sender wants to send to the receiver to the communication data receiving unit 103 of the data management device 100. The second transmission unit 202 transmits the composite information output by the composite information output unit 107 of the data management device 100 to the recipient terminal 300 by e-mail or the like.

  The recipient terminal 300 includes a receiving unit 301, an inquiry unit 302, and an output unit 303. Each unit is implemented in mail software in the same manner as the caller terminal 200.

  The reception unit 301 receives the composite information from the second transmission unit 202 of the caller terminal 200. The inquiry unit 302 makes an inquiry to the communication data output unit 109 of the data management apparatus 100 based on the combination information received by the reception unit 301. The output unit 303 receives the email main body, the sender's email address, and time information output from the communication data output unit 109 of the data management apparatus 100, and displays them on a screen, for example.

  FIG. 11 is a sequence diagram showing an example of a communication procedure of the data management system in the present embodiment. In this example, as in the example of FIG. 6, the composite information generation unit 105 of the data management apparatus 100 uses the hash value of the data obtained by combining the time information, the time-varying information, and the sender's e-mail address as the composite information. It shall be represented by a code consisting of letters and numbers.

  First, the caller operates the mail software to create a mail body (attached file or the like may be added), and requests that the mail body be transmitted to the recipient. The sender's mail software requests the mail management center to issue a code. At this time, the mail software on the caller side transmits the mail address of the caller and the text of the mail to the mail management center. Next, the mail management center issues a code using the sender's mail address. At this time, the mail management center stores the mail address of the caller, the text of the mail, and the issued code. The mail software on the sender side transmits a mail including only the code without including the body of the mail to the receiver, and notifies the sender that the transmission of the mail has been completed.

  The mail software on the receiver side receives the mail with only the code added, and inquires about the sender and the mail using the code added to the received mail. At this time, the mail software on the receiver side notifies the mail management center of the mail address of the sender indicated in the mail with only the code added. Next, the mail management center compares the mail address received from the mail software on the recipient side with the mail address of the caller referred to by the code, proves the legitimacy of the caller, and checks the mail Send the message to the recipient's mail software.

  The mail software on the recipient side receives the mail text from the mail management center and displays the received mail text to the recipient.

  In this way, the mail management center saves the body text and attached files at the mail management center, and when sending mail, only the code is sent to the mail without attaching the text or attached file, and the mail software on the receiving side manages the mail. It is possible to prevent eavesdropping and leakage of the mail text and attached files on the Internet by configuring the mail text and attached files to be obtained when the code is inquired to the center.

  12 and 13 are flowcharts showing the operation of the data management system according to the present embodiment.

  First, in the data management apparatus 100, the caller authentication unit 102 authenticates the caller terminal 200 based on the authentication information stored in the authentication database 112 (step S401: caller authentication step / caller authentication process).

  Next, in the caller terminal 200, the first sending unit 201 sends an e-mail to the communication data receiving unit 103 of the data management device 100. (Step S501).

  Next, in the data management apparatus 100, the communication data receiving unit 103 receives an e-mail (including the e-mail address of the caller and the e-mail body) from the caller terminal 200 authenticated by the caller authentication unit 102. (Step S402: communication data reception step / communication data reception process). The sender information storage unit 104 stores the sender's e-mail address received by the communication data receiving unit 103 in the sender database 113 (step S403: sender information storage step / sender information storage process). The input unit 101 inputs time information indicating time and time-varying information that changes with the passage of time (step S404: input step / input processing). The composite information generation unit 105 combines the time information input by the input unit 101, the time-change information, and the e-mail address stored by the sender information storage unit 104, and synthesizes the e-mail received by the communication data reception unit 103. Information is generated (step S405: synthesis information generation step / synthesis information generation process). The communication data storage unit 106 encrypts the electronic mail body received by the communication data receiving unit 103 (step S406), and combines the encrypted electronic mail body together with the composite information generated by the composite information generation unit 105 into the communication database 114. (Step S407) (steps S406 and S407: communication data storage step / communication data storage process). The composite information output unit 107 outputs the composite information stored by the communication data storage unit 106 to the caller terminal 200 (step S408: composite information output step / composite information output process).

  Next, in the sender terminal 200, the second transmitter 202 transmits the composite information output by the composite information output unit 107 of the data management device 100 to the receiver terminal 300 (step S502).

  Next, in the receiver terminal 300, the receiver 301 receives the composite information from the second transmitter 202 of the sender terminal 200 (step S601).

  Next, in the data management apparatus 100, the recipient authentication unit 115 authenticates the recipient terminal 300 based on the authentication information stored in the authentication database 112 (step S409: recipient authentication step / recipient authentication process). .

  Next, in the recipient terminal 300, the inquiry unit 302 makes an inquiry to the communication data output unit 109 of the data management apparatus 100 using the composite information received by the reception unit 301 (step S602).

  Next, in the data management apparatus 100, the communication data output unit 109 searches the communication database 114 for an email body corresponding to the combined information in response to the inquiry based on the combined information from the recipient terminal 300 (step S410). The retrieved email body is decrypted (step S411), the sender's email address corresponding to the email body is retrieved from the sender database 113 (step S412), and the decrypted email body and the retrieved email are searched. The address and the time information used by the composite information generation unit 105 to generate the composite information are output (step S413) (steps S410 to S413: communication data output step / communication data output process).

  Finally, in the recipient terminal 300, the output unit 303 displays the electronic mail body, the sender's email address, and time information output by the communication data output unit 109 of the data management apparatus 100 on the screen (step S603). .

As described above, in the present embodiment, in the data management device,
The receiver authentication unit authenticates the receiver terminal, the communication data output unit authenticates the retrieved communication data, the sender information, and the time information used by the composite information generation unit by the receiver authentication unit. , The receiver can acquire the communication data without transmitting the communication data directly to the receiver.

FIG. 3 is a diagram illustrating an example of an appearance of a data management device according to Embodiment 1 or 2. 3 is a diagram illustrating an example of a hardware configuration of a data management device according to Embodiment 1 or 2. FIG. 1 is a diagram illustrating an example of a configuration of a data management system according to a first embodiment. 1 is a block diagram illustrating a configuration of a data management device according to a first embodiment. FIG. 3 is a block diagram illustrating configurations of a sender terminal and a receiver terminal according to the first embodiment. FIG. 3 is a sequence diagram showing a first example of a communication procedure of the data management system in the first embodiment. FIG. 6 is a sequence diagram showing a second example of a communication procedure of the data management system in the first embodiment. FIG. 3 is a flowchart (1/2) showing an operation of the data management system according to the first embodiment. FIG. 3 is a flowchart (2/2) showing the operation of the data management system according to the first embodiment. FIG. 4 is a block diagram illustrating a configuration of a data management device according to a second embodiment. FIG. 11 is a sequence diagram illustrating an example of a communication procedure of the data management system in the second embodiment. FIG. 10 is a flowchart (1/2) showing the operation of the data management system according to the second embodiment. FIG. 9 is a flowchart (2/2) showing the operation of the data management system according to the second embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 100 Data management apparatus, 101 Input part, 102 Caller authentication part, 103 Communication data receiving part, 104 Caller information storage part, 105 Composite information generation part, 106 Communication data storage part, 107 Composite information output part, 108 Time information output 109, communication data output unit, 110 transmission data reception unit, 111 comparison result output unit, 112 authentication database, 113 caller database, 114 communication database, 115 receiver authentication unit, 200 caller terminal, 201 first transmission unit 202 Second transmission unit, 250, 350 mail server, 300 recipient terminal, 301 reception unit, 302 inquiry unit, 303 output unit, 400 network, 901 CRT display device, 902 K / B, 903 mouse, 904 FDD, 905 CDD, 906 Printer device, 9 7 Scanner device, 910 system unit, 911 CPU, 912 bus, 913 ROM, 914 RAM, 915 communication board, 920 magnetic disk device, 921 OS, 922 window system, 923 program group, 924 file group, 932 FAX machine, 940 Internet 941 Gateway, 942 LAN.

Claims (10)

In a data management device that connects a sender terminal that transmits communication data and a receiver terminal that receives the communication data, and manages the communication data,
An authentication database for storing authentication information for authenticating the caller terminal;
A caller database for storing caller information about a caller sending communication data;
A communication database for storing communication data in association with caller information related to the communication data;
An input unit for inputting time information indicating the time and time-dependent change information that changes with the passage of time;
A caller authentication unit that authenticates the caller terminal based on authentication information stored in the authentication database;
A communication data receiving unit that receives communication data together with caller information from a caller terminal authenticated by the caller authentication unit;
A caller information storage unit that stores the caller information received by the communication data reception unit in the caller database;
Synthesizing information generation for synthesizing time information input by the input unit, time-change information, and sender information stored by the sender information storage unit, and generating composite information for the communication data received by the communication data receiving unit And
Along with the synthesis information generated by the synthesis information generation unit, a communication data storage unit that stores the communication data received by the communication data reception unit in the communication database;
A synthesis information output unit that outputs the synthesis information stored by the communication data storage unit;
In response to the inquiry by the composite information output from the composite information output unit from the receiver terminal, the communication data corresponding to the composite information is searched from the communication database, and the caller corresponding to the communication data from the caller database A data management unit comprising: a communication data output unit that retrieves information, and outputs the retrieved communication data, sender information, and time information used by the composite information generation unit to generate the composite information apparatus. The data management device further includes:
A transmission data receiver for receiving communication data transmitted from the sender terminal to the receiver terminal, sender information and time information added to the communication data, from the receiver terminal;
The communication data received by the transmission data receiving unit is compared with the communication data output by the communication data output unit. The caller information received by the transmission data reception unit and the caller information output by the communication data output unit; A comparison result output unit that compares the time information received by the transmission data reception unit with the time information output by the communication data output unit and outputs a comparison result. The data management apparatus according to 1. The authentication database further includes:
Storing authentication information for authenticating the recipient terminal;
The data management device further includes:
Based on the authentication information stored in the authentication database, comprising a receiver authentication unit for authenticating the receiver terminal,
The communication data output unit
Outputting the communication data searched from the communication database, the sender information searched from the sender database, and the time information used by the composite information generation unit to the receiver terminal authenticated by the receiver authentication unit. The data management apparatus according to claim 1. The communication data storage unit
Encrypting the communication data received by the communication data receiving unit, storing the encrypted communication data in the communication database,
The communication data output unit
4. The data management apparatus according to claim 1, wherein the communication data retrieved from the communication database is decrypted and the decrypted communication data is output.   5. The data management apparatus according to claim 1, wherein the time-dependent change information is weather information.   6. The data management apparatus according to claim 1, wherein the communication data is an e-mail, and the sender information includes an e-mail address of the sender. An authentication database that stores in advance authentication information for authenticating a caller terminal that transmits communication data, a caller database that stores caller information related to a caller that transmits communication data, and communication data. A data management device that has a communication database stored in association with the sender information, and that connects the sender terminal and a receiver terminal that receives communication data transmitted by the sender terminal, and manages the communication data In the data management method using
An input step for inputting time information indicating time and time-varying information that changes with the passage of time;
A caller authentication step for authenticating the caller terminal based on authentication information stored in the authentication database;
A communication data receiving step for receiving communication data together with the caller information from the caller terminal authenticated in the caller authentication step;
A caller information storage step for storing the caller information received in the communication data reception step in the caller database;
Synthesizing information generation for synthesizing the time information input in the input step, the time-varying information, and the sender information stored in the sender information storing step to generate composite information for the communication data received in the communication data receiving step Steps,
A communication data storage step for storing the communication data received in the communication data reception step in the communication database, together with the synthesis information generated in the synthesis information generation step,
A composite information output step for outputting the composite information stored in the communication data storage step;
In response to the inquiry by the composite information output in the composite information output step from the receiver terminal, the communication data corresponding to the composite information is searched from the communication database, and the sender corresponding to the communication data from the sender database A data management comprising: a communication data output step of searching for information, and outputting the searched communication data, sender information, and time information used in the composite information generation step to generate the composite information Method. An authentication database that stores in advance authentication information for authenticating a caller terminal that transmits communication data, a caller database that stores caller information related to a caller that transmits communication data, and communication data. A data management device that has a communication database stored in association with the sender information, and that connects the sender terminal and a receiver terminal that receives communication data transmitted by the sender terminal, and manages the communication data In the data management program executed by
An input process for inputting time information indicating the time and time-dependent change information that changes with the passage of time;
A caller authentication process for authenticating the caller terminal based on authentication information stored in the authentication database;
A communication data receiving process for receiving communication data together with caller information from a caller terminal authenticated by the caller authentication process;
A caller information storage process for storing the caller information received by the communication data reception process in the caller database;
Synthesizing information generation for synthesizing the time information input by the input process, the time-dependent change information, and the sender information stored by the sender information storing process, and generating synthesized information for the communication data received by the communication data receiving process Processing,
A communication data storage process for storing the communication data received by the communication data reception process in the communication database together with the composite information generated by the composite information generation process,
A composite information output process for outputting the composite information stored by the communication data storage process;
In response to the inquiry by the composite information output by the composite information output process from the receiver terminal, the communication data corresponding to the composite information is searched from the communication database, and the sender corresponding to the communication data from the sender database A computer that executes a communication data output process that retrieves information and outputs the retrieved communication data, sender information, and time information used by the composite information generation process to generate the composite information. Data management program. In a data management system comprising a sender terminal that transmits communication data, a receiver terminal that receives the communication data, and a data management device that manages the communication data,
The data management device includes:
An authentication database for storing authentication information for authenticating the caller terminal;
A caller database for storing caller information about a caller sending communication data;
A communication database for storing communication data in association with caller information related to the communication data;
An input unit for inputting time information indicating the time and time-dependent change information that changes with the passage of time;
A caller authentication unit that authenticates the caller terminal based on authentication information stored in the authentication database;
A communication data receiving unit that receives communication data together with caller information from a caller terminal authenticated by the caller authentication unit;
A caller information storage unit that stores the caller information received by the communication data reception unit in the caller database;
Synthesizing information generation for synthesizing time information input by the input unit, time-change information, and sender information stored by the sender information storage unit, and generating composite information for the communication data received by the communication data receiving unit And
Along with the synthesis information generated by the synthesis information generation unit, a communication data storage unit that stores the communication data received by the communication data reception unit in the communication database;
A synthesis information output unit that outputs the synthesis information stored by the communication data storage unit;
A time information output unit that outputs time information used by the synthesis information generation unit to generate the synthesis information output by the synthesis information output unit;
In response to the inquiry by the composite information output from the composite information output unit from the receiver terminal, the communication data corresponding to the composite information is searched from the communication database, and the caller corresponding to the communication data from the caller database A communication data output unit that retrieves information, outputs the retrieved communication data, sender information, and time information used by the composite information generation unit to generate the composite information;
A transmission data receiver for receiving communication data transmitted from the sender terminal to the receiver terminal, sender information and time information added to the communication data, from the receiver terminal;
The communication data received by the transmission data receiving unit is compared with the communication data output by the communication data output unit. The caller information received by the transmission data reception unit and the caller information output by the communication data output unit; A comparison result output unit that compares the time information received by the transmission data reception unit and the time information output by the communication data output unit, and outputs a comparison result,
The caller terminal is
A first transmitter that transmits communication data together with the caller information to the communication data receiver;
Second information for transmitting the communication data to the receiver terminal by adding the sender information, the time information output by the time information output unit and the composite information output by the composite information output unit to the communication data. With a transmitter,
The recipient terminal is
A receiver for receiving communication data to which sender information, time information, and composite information are added from the sender terminal;
The communication data output unit is inquired by the composite information added to the communication data received by the receiving unit, and is added to the communication data received by the receiving unit and the communication data to the outgoing data receiving unit. An inquiry section for transmitting the caller information and the time information,
A data management system comprising: an output unit that outputs communication data, caller information, and time information received by the receiving unit based on a comparison result output by the comparison result output unit. In a data management system comprising a sender terminal that transmits communication data, a receiver terminal that receives the communication data, and a data management device that manages the communication data,
The data management device includes:
An authentication database for storing authentication information for authenticating the sender terminal and the receiver terminal;
A caller database for storing caller information about a caller sending communication data;
A communication database for storing communication data in association with caller information related to the communication data;
An input unit for inputting time information indicating the time and time-dependent change information that changes with the passage of time;
A caller authentication unit that authenticates the caller terminal based on authentication information stored in the authentication database;
A communication data receiving unit that receives communication data together with caller information from a caller terminal authenticated by the caller authentication unit;
A caller information storage unit that stores the caller information received by the communication data reception unit in the caller database;
Synthesizing information generation for synthesizing time information input by the input unit, time-change information, and sender information stored by the sender information storage unit, and generating composite information for the communication data received by the communication data receiving unit And
Along with the synthesis information generated by the synthesis information generation unit, a communication data storage unit that stores the communication data received by the communication data reception unit in the communication database;
A synthesis information output unit that outputs the synthesis information stored by the communication data storage unit;
Based on authentication information stored in the authentication database, a receiver authentication unit for authenticating the receiver terminal;
In response to the inquiry by the composite information output from the composite information output unit from the receiver terminal, the communication data corresponding to the composite information is searched from the communication database, and the caller corresponding to the communication data from the caller database Information is retrieved, and the retrieved communication data, sender information, and time information used by the composite information generation unit to generate the composite information are sent to the receiver terminal authenticated by the receiver authentication unit. A communication data output unit for outputting,
The caller terminal is
A first transmitter that transmits communication data together with the caller information to the communication data receiver;
A second transmitter that transmits the composite information output by the composite information output unit to the receiver terminal;
The recipient terminal is
A receiver for receiving composite information from the caller terminal;
An inquiry unit that makes an inquiry with the composite information received by the reception unit, with respect to the communication data output unit,
A data management system comprising: an output unit that outputs communication data output from the communication data output unit, sender information, and time information.

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