JP5417026B2 - Password notification device and password notification system - Google Patents

Description

  The present invention relates to a password notification device and a password notification system for notifying a decryption password for decrypting an encrypted file.

  Conventionally, when confidential document data is transmitted using electronic mail or the like, an encrypted file and a decryption password for decrypting the encrypted file are often transmitted separately. However, if the encrypted file and the decryption password are mistakenly transmitted to a third party, the encrypted file may be decrypted by the third party and the confidential document may be leaked.

  Therefore, in order to reduce the user's erroneous operation during transmission, a method for prompting the user to pay attention has been proposed. For example, Non-Patent Document 1 discloses a method in which a transmission mail is temporarily held in a quarantine area before being sent from a mail server to a network, and distributed after a predetermined time has elapsed. Further, in Patent Document 1, in a secure proxy provided between the mailer and the mail server, the destination, the mail content, and the safety during the transmission are evaluated, and the outgoing mail is determined based on the mailer response to the evaluation result. It has been proposed to relay to a mail server.

JP 2007-87327 A

“PlayBackMail (registered trademark)”, [online], [Search April 7, 2009], Internet <URL: http: // www. cskwin. com / Products / PlayBackMail. html>

  However, even with the above-described method, it is necessary to transmit the decryption password separately, so that there is a possibility that the decryption password is still transmitted erroneously. Furthermore, it was not possible to know whether the transmission partner actually decrypted the encrypted file.

  An object of the present invention is to provide a password notification device and a password notification system that can securely transmit a decryption password and easily know the acquisition destination of the decryption password.

  The present invention provides the following solutions.

(1) receiving means for receiving a decryption password for decrypting the encrypted file from a transmitting terminal that transmits the encrypted file to the receiving terminal via the first path;
Receiving means for receiving access from the first receiving terminal and acquiring identification data for identifying a user of the first receiving terminal;
A password notification device comprising: a transmission unit configured to transmit the decryption password received by the reception unit to the first reception terminal through a second route in response to the acquisition of the identification data by the reception unit.

  According to such a configuration, the password notification device has received the decryption password from the transmission terminal that has transmitted the encrypted file through the first path, and has acquired identification data together with access from the first reception terminal. In response, the decryption password is transmitted to the first receiving terminal via the second route.

  Therefore, the password notification device can safely distribute the decryption password through a second route different from the first route through which the encrypted file is transmitted. Furthermore, the acquisition destination of the decryption password can be easily known by referring to the identification data acquired by the password notification device.

  (2) The accepting unit transmits to the password notification device transmitted from the second receiving terminal to the first receiving terminal after being transmitted together with the encrypted file from the transmitting terminal to the second receiving terminal. The password notification device according to (1), wherein the access is accepted based on the access data.

  According to such a configuration, since the password notification device accepts access from the first receiving terminal based on the access data transmitted from the transmitting terminal, the recipient of the decryption password is designated as the user who acquired the access data. It can be limited to.

  (3) The password notification device according to (2), further including a generation unit that generates the access data and notifies the transmission terminal in response to the reception of the decryption password by the reception unit.

  According to such a configuration, the password notification device generates access data and notifies the transmission terminal, so that the transmission terminal does not need to generate access data. That is, when the transmission terminal generates, a predetermined storage area allocated in advance is specified. However, the password notification device does not limit the storage area of the received decryption password to the predetermined storage area each time. Can be varied. Accordingly, the confidentiality is increased as compared with the case where the predetermined storage area is used, and as a result, the access can be limited to the access from the recipient who acquired the access data, and thus the safety is improved.

(4) storage means for storing identification data for identifying a user permitted to receive the decryption password;
An authentication unit that authenticates the identification data received by the receiving unit with the identification data stored in the storage unit;
The password notification device according to any one of (1) to (3), wherein the transmission unit transmits the decryption password when identification data is authenticated by the authentication unit.

  According to such a configuration, the password notification device can authenticate the identification data acquired from the first receiving terminal by collating with the identification data of the authorized user stored in advance. Therefore, the decryption password can be transmitted safely without being distributed to unintended users.

(5) transfer means for transferring the identification data received by the reception means to the transmission terminal;
Authentication means for receiving authentication data indicating that the user identified by the identification data is permitted to receive the decryption password from the transmission terminal; and
The password notification device according to any one of (1) to (3), wherein the transmission unit transmits the decryption password when the authentication data is received by the authentication unit.

  According to such a configuration, the password notification device receives the input as to whether or not to transmit the decryption password by transferring the identification data acquired from the first receiving terminal to the transmitting terminal, and authenticates the identification data. can do. Therefore, the decryption password can be transmitted safely without being distributed to unintended users.

  (6) When the transmission unit acquires the data indicating the transmission destination as the identification data by the reception unit, the transmission unit transmits the decryption password to the transmission destination and does not acquire the data indicating the transmission destination In this case, the password notification device according to any one of (1) to (5), wherein the decryption password is transmitted to the first receiving terminal.

  According to such a configuration, the password notification device can transmit the decryption password to the transmission destination when data indicating the transmission destination, that is, an e-mail address or the like is acquired as identification data of the recipient. Therefore, the receiver can easily obtain the decryption password at the terminal that wants to use the encrypted file.

(7) A transmitting terminal that transmits an encrypted file, a password notification device that notifies a decryption password for decrypting the encrypted file, a first receiving terminal that receives the decryption password, and the encrypted file A second notification terminal for receiving the password notification system,
First transmission means for transmitting the decryption password from the transmission terminal to the password notification device;
Second transmission means for transmitting access data to the encrypted file and the password notification device from the transmitting terminal to the second receiving terminal via a first path;
Third transmitting means for transmitting the access data from the second receiving terminal to the first receiving terminal;
In response to accessing the password notification device based on the access data, identification data for identifying the user of the first receiving terminal is transmitted from the first receiving terminal to the password notification device. A transmission means;
A fifth transmission means for transmitting the decryption password from the password notification device to the first receiving terminal through a second route in response to the password notification device acquiring the identification data. .

  According to such a configuration, the same effects as in (1) and (2) can be expected by operating the system.

  According to the present invention, it is possible to securely transmit a decryption password and easily know the acquisition destination of the decryption password.

It is a figure which shows the whole structure of the system which concerns on 1st Embodiment. It is a figure which shows the hardware constitutions of the notification server which concerns on 1st Embodiment. It is a figure which shows the function structure of the system which concerns on 1st Embodiment. It is a sequence diagram which shows the flow of the process which concerns on 1st Embodiment. It is a figure which shows the whole structure of the system which concerns on 2nd Embodiment. It is a sequence diagram which shows the flow of the process which concerns on 2nd Embodiment.

<First Embodiment>
Hereinafter, as an example of an embodiment of the present invention, a first embodiment will be described with reference to FIGS.

[Entire system configuration]
FIG. 1 is a diagram showing an overall configuration of a system 1 (password notification system) including a notification server 20 (password notification device) and related elements according to the present embodiment. The notification server 20, the reception-side portable terminal 30 (first reception terminal), the transmission-side mail server 50, and the reception-side mail server 60 are connected via a predetermined network such as the Internet. The transmitting terminal 10 (transmitting terminal) is connected to the notification server 20 and the transmitting mail server 50, and the receiving terminal 40 (second receiving terminal) is connected to the receiving mail server 60.

  The transmission side terminal 10 generates an encrypted file obtained by encrypting the confidential document and a decryption password for decrypting the encrypted file, and notifies the reception side terminal 40 of the encrypted file. At this time, the encrypted file is transmitted from the transmission side terminal 10 to the reception side terminal 40 via the transmission side mail server 50 and the reception side mail server 60 (first path). On the other hand, the decryption password is transmitted to the reception-side mobile terminal 30 via the notification server 20 and notified to the user of the reception-side terminal 40 (second route). As described above, the encrypted file and the decryption password are transmitted through different paths.

[Hardware configuration]
FIG. 2 is a diagram illustrating a hardware configuration of the notification server 20 according to the present embodiment. The notification server 20 includes a control unit 110, a storage unit 120, an input unit 130, a display unit 140, and a communication unit 150, and each hardware is connected via a bus 160.

  The control unit 110 is a part that controls the entire notification server 20, and appropriately reads and executes various programs stored in the storage unit 120, thereby cooperating with the above-described hardware and various functions according to the present invention. Is realized. The control unit 110 may be a CPU (Central Processing Unit).

  The storage unit 120 stores various programs for causing the hardware group to function as the notification server 20, programs for causing the control unit 110 to execute the functions of the present invention, a database, and the like. The storage unit 120 may be configured by any of various storage devices such as a hard disk, an optical disk drive, or a semiconductor memory.

  The input unit 130 is an interface device that receives an instruction input from a user (an administrator of the notification server 20) with respect to the notification server 20. The input unit 130 is configured by, for example, a keyboard and a mouse.

  The display unit 140 displays a screen for accepting data input to the user (administrator of the notification server 20) or displays a screen of a processing result by the notification server 20. The display unit 140 may be a display device such as a cathode ray tube display device (CRT) or a liquid crystal display device (LCD).

  The communication unit 150 is a network adapter when the notification server 20 transmits / receives information to / from the transmission side terminal 10, the reception side portable terminal 30 and other information terminals via the network.

  Note that the transmitting terminal 10, the receiving mobile terminal 30, and the receiving terminal 40 may have the same configuration as the notification server 20. That is, each terminal is provided with the control part 110, the memory | storage part 120, the input part 130, the display part 140, and the communication part 150, and can mutually transmit / receive data via a network.

[Function configuration]
FIG. 3 is a diagram illustrating a functional configuration of the system 1 according to the present embodiment.
The control unit 110 of the transmission side terminal 10 includes a data generation unit 11, a password transmission unit 12, and a file transmission unit 13. The control unit 110 of the notification server 20 includes a password reception unit 21 (reception unit), a user information acquisition unit 22 (reception unit), an authentication unit 23 (authentication unit), and a password transmission unit 24 (transmission unit). Prepare. The storage unit 120 of the notification server 20 includes a password DB 25, a log DB 26, and an authentication DB 27 (storage means).

  The control unit 110 of the receiving-side mobile terminal 30 includes an access information receiving unit 31, a password requesting unit 32, a password receiving unit 33, and a password transmitting unit 34. The control unit 110 of the receiving terminal 40 includes a file receiving unit 41, an access information transmitting unit 42, and a password receiving unit 43.

  Here, the password transmission unit 12 and the password reception unit 21 correspond to a first transmission unit. The file transmission unit 13 and the file reception unit 41 correspond to a second transmission unit. Further, the access information transmitting unit 42 and the access information receiving unit 31 correspond to a third transmitting unit. The password request unit 32 and the user information acquisition unit 22 correspond to a fourth transmission unit. The password transmission unit 24 and the password reception unit 33 correspond to a fifth transmission unit.

  The data generation unit 11 encrypts the confidential document in response to an instruction input from the transmission-side user, and generates an encrypted file and a decryption password. In addition, the data generation unit 11 generates access data for obtaining a decryption password stored in the notification server 20 described later. Here, the access data is, for example, the URL of the notification server 20 and indicates a predetermined access destination assigned to each encrypted file or each user of the transmission side terminal 10.

  The password transmission unit 12 transmits the decryption password generated by the data generation unit 11 to the notification server 20.

  The file transmission unit 13 transmits the encrypted file and the access data generated by the data generation unit 11 to the reception side terminal 40. At this time, the file transmission unit 13 may transmit the electronic mail via the transmission side mail server 50 and the reception side mail server 60 in the same manner as the transmission of the document that does not require the decryption password.

  The password receiving unit 21 receives the decrypted password transmitted by the password transmitting unit 12 and stores it in the password DB 25. The area to be stored may be set in advance in association with the transmission side terminal 10 or the user of the transmission side terminal 10, and is assumed to be identifiable on the basis of the access data described above.

  The user information acquisition unit 22 receives a password acquisition request from the reception-side mobile terminal 30 based on the access data, and receives user information (identification data) for identifying the reception-side mobile terminal 30 or the user of the reception-side mobile terminal 30. get. Specifically, the user information includes a user name, a telephone number, a terminal identification number of the receiving-side mobile terminal 30, an IP address, and the like. The user information acquisition unit 22 stores the earned user information in the log DB 26.

  The authentication unit 23 authenticates the user information acquired by the user information acquisition unit 22 by comparing it with the authentication DB 27 and determines whether or not to permit transmission of a password. In the authentication DB 27, a list of user information designated in advance by the user of the transmission side terminal 10 is registered.

  The password transmission unit 24 transmits the decryption password stored in the password DB 25 to the reception-side mobile terminal 30 when the user information is authenticated by the authentication unit 23.

  The access information receiving unit 31 receives access data for accessing the notification server 20 from the receiving terminal 40. Specifically, it is realized by receiving an electronic mail, but is not limited thereto. For example, it may be received by reading a two-dimensional or three-dimensional barcode.

  The password request unit 32 accesses the notification server 20 based on the access data received by the access information receiving unit 31. As a result, a decryption password is requested and user information is transmitted to the notification server 20.

  The password receiving unit 33 receives the decryption password transmitted from the notification server 20.

  In response to receiving the decryption password by the password receiving unit 33, the password transmission unit 34 automatically transmits this decryption password to the receiving terminal 40 by e-mail.

  The file receiving unit 41 receives the encrypted file and access data transmitted from the transmitting terminal 10.

  The access information transmission unit 42 transmits the access data received by the file reception unit 41 to the reception-side mobile terminal 30. Specifically, it is realized by transmitting an e-mail, but is not limited thereto. For example, the access information receiving unit 31 may be configured to display a two-dimensional or three-dimensional barcode on the display unit 140.

  The password receiving unit 43 receives the decrypted password e-mail transmitted from the receiving-side mobile terminal 30. Thereby, the user of the receiving terminal 40 can decrypt the encrypted file received by the file receiving unit 41 and browse the document.

[Processing sequence]
FIG. 4 is a sequence diagram showing the flow of processing in the system 1 according to the present embodiment.

  In step S1, the transmitting terminal 10 generates an encrypted file F1, a decryption password K1, and access data I1 in response to a request from the user.

  In step S <b> 2, the transmitting terminal 10 transmits the decryption password K <b> 1 generated in step S <b> 1 to the notification server 20 in response to a request from the user.

  In step S3, the notification server 20 receives the decryption password K1 transmitted in step S2, and stores it in the password DB 25. Thereafter, the notification server 20 waits for access from the receiving-side mobile terminal 30.

  In step S4, the transmission side terminal 10 transmits the encrypted file F1 and the access data I1 to the reception side terminal 40 in response to a request from the user.

  In step S5, the receiving terminal 40 receives the encrypted file F1 and access data I1 transmitted in step S4. Further, the receiving side terminal 40 delivers the access data I1 to the receiving side portable terminal 30.

  In step S6, the receiving-side mobile terminal 30 accesses the notification server 20 based on the access data I1 and transmits user information I2 in response to an instruction input from the user.

  In step S7, the notification server 20 receives the user information I2 transmitted in step S6 and stores it in the log DB 26. Furthermore, the notification server 20 authenticates the user information I2 by checking with the authentication DB 27.

  In step S8, the notification server 20 transmits the decryption password K1 to the reception-side mobile terminal 30 that has transmitted the user information I2 authenticated in step S7.

  In step S <b> 9, when receiving the decryption password K <b> 1 transmitted in step S <b> 8, the receiving mobile terminal 30 transmits this decryption password K <b> 1 to the receiving terminal 40.

  In step S10, the receiving terminal 40 decrypts the encrypted file F1 using the decryption password K1 in response to an instruction input from the user.

  As described above, according to the present embodiment, the encrypted file and the decryption password are transmitted through different paths. This makes it possible to distribute passwords to limited partners. Even if the encrypted file is sent to the wrong destination, the decryption password stored in the notification server 20 is deleted or the number of users who can obtain the decryption password is restricted. Password acquisition can be prevented. Furthermore, the mail sender can select and use the transmission of the encrypted file and the mail transmission that does not require encryption according to the situation.

  The notification server stores user information of the user who has acquired the decryption password. As a result, the sender of the encrypted file can easily grasp the partner to whom the decryption password has been distributed.

  In the present embodiment, the access data is generated by the transmitting terminal 10, but the present invention is not limited to this. For example, it may be predetermined data prepared in advance, or may be generated in response to the reception of the decryption password by the password receiving unit 21 (generating unit) of the notification server 20 and notified to the transmitting terminal 10.

  In addition, the series of processes in steps S1 and S2 described above can be automated by a predetermined mail transmission program. That is, step S2 can be executed without the user's operation input, and the decryption password can be easily stored in the notification server 20.

  Further, in the present embodiment, the authentication unit 23 performs authentication of user information by collating with the authentication DB 27 registered in advance, but is not limited thereto. For example, the authentication unit 23 (transfer means, authentication means) may transmit user information to the transmission-side terminal 10 and perform authentication based on the permission / non-permission input of the user of the transmission-side terminal 10.

  Moreover, in this embodiment, the password transmission part 24 transmitted the decryption password to the receiving side portable terminal 30, but it is not restricted to this. For example, when the transmission destination address is acquired as the user information by the user information acquisition unit 22, the password transmission unit 24 may transmit the decryption password with the transmission destination address as the destination.

Second Embodiment
Hereinafter, as an example of an embodiment of the present invention, a second embodiment will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the structure similar to 1st Embodiment, and description is abbreviate | omitted or simplified.

[Entire system configuration]
FIG. 5 is a diagram showing an overall configuration of a system 1a (password notification system) including a transmission-side portable terminal 20a (password notification device) and related elements according to the present embodiment. In the present embodiment, the notification server 20 in the first embodiment is changed to the transmission-side portable terminal 20a.

  The transmitting-side portable terminal 20a and the receiving-side portable terminal 30 (first receiving terminal) are connected to a predetermined network such as the Internet via a wireless network, and the transmitting-side mail server 50, the receiving-side mail server 60, Are connected via a predetermined network. The transmitting terminal 10 (transmitting terminal) is connected to the transmitting mail server 50, and the receiving terminal 40 (second receiving terminal) is connected to the receiving mail server 60.

  Similar to the first embodiment, the transmission side terminal 10 generates an encrypted file obtained by encrypting the confidential document and a decryption password for decrypting the encrypted file, and notifies the reception side terminal 40 of the encrypted file. At this time, the encrypted file is transmitted from the transmission side terminal 10 to the reception side terminal 40 via the transmission side mail server 50 and the reception side mail server 60. On the other hand, the decryption password is transmitted to the reception-side portable terminal 30 via the transmission-side portable terminal 20a and notified to the user of the reception-side terminal 40. As described above, the encrypted file and the decryption password are transmitted through different paths.

  The transmitting-side portable terminal 20a has the same configuration (see FIG. 2) as the notification server 20 in the first embodiment, and the system 1a has the same configuration (see FIG. 3) as the system 1 in the first embodiment. Prepare.

[Processing sequence]
FIG. 6 is a sequence diagram showing the flow of processing in the system 1a according to the present embodiment.

  In step S11, the transmission side terminal 10 generates an encrypted file F1, a decryption password K1, and access data I1 in response to a request from the user.

  In step S12, the transmitting terminal 10 transmits the decryption password K1 generated in step S11 to the transmitting portable terminal 20a.

  Here, the transmitting terminal 10 transmits the decryption password K1 via the network, but is not limited thereto. For example, the configuration may be such that a two-dimensional or three-dimensional barcode is displayed on the display unit 140 of the transmission side terminal 10 and is read by the password reception unit 21 of the transmission side portable terminal 20a.

  In step S13, the transmitting-side portable terminal 20a receives the decryption password K1 transmitted in step S12 and stores it in the password DB 25. Thereafter, the transmission-side portable terminal 20 a waits for access from the reception-side portable terminal 30.

  In step S <b> 14, the transmission side terminal 10 transmits the encrypted file F <b> 1 and the access data I <b> 1 to the reception side terminal 40.

  In step S15, the receiving side terminal 40 receives the encrypted file F1 and the access data I1 transmitted in step S14. Further, the receiving side terminal 40 delivers the access data I1 to the receiving side portable terminal 30.

  In step S16, the reception-side portable terminal 30 accesses the transmission-side portable terminal 20a based on the access data I1 and transmits user information I2 in response to an instruction input from the user.

  In step S17, the transmitting-side portable terminal 20a receives the user information I2 transmitted in step S16 and stores it in the log DB 26. Furthermore, the transmission-side portable terminal 20a authenticates the user information I2 by checking with the authentication DB 27.

  In step S18, the transmission-side portable terminal 20a transmits the decryption password K1 to the reception-side portable terminal 30 that has transmitted the user information I2 authenticated in step S17.

  In step S19, when receiving the decryption password K1 transmitted in step S18, the reception-side mobile terminal 30 transmits the decryption password K1 to the reception-side terminal 40.

  In step S20, the receiving side terminal 40 decrypts the encrypted file F1 using the decryption password K1 in response to an instruction input from the user.

  As described above, according to the present embodiment, by using the transmission-side portable terminal 20a, the sender and the receiver can be installed without installing a new device like the notification server 20 of the first embodiment. A safe password notification can be realized using its own mobile terminal (transmission-side mobile terminal 20a, reception-side mobile terminal 30).

  Note that a series of processes (steps S16 to S19) in which the receiving-side mobile terminal 30 accesses the transmitting-side mobile terminal 20a to acquire the decryption password K1 (steps S16 to S19) is automated by linking predetermined applications that operate on both terminals. It is preferable. For example, data transmission / reception may be performed by a transmission / reception protocol such as a short message service to automatically start an application of the partner terminal (transmission side mobile terminal 20a).

  As mentioned above, although embodiment of this invention was described, this invention is not restricted to embodiment mentioned above. The effects described in the embodiments of the present invention are only the most preferable effects resulting from the present invention, and the effects of the present invention are limited to those described in the embodiments of the present invention. is not.

1, 1a system (password notification system)
10 Sending terminal (sending terminal)
11 Data generation unit 12 Password transmission unit (first transmission means)
13 File transmission unit (second transmission means)
20 Notification server (password notification device)
20a Sending mobile terminal (password notification device)
21 Password receiving unit (receiving means, generating means, first transmitting means)
22 User information acquisition unit (accepting means, fourth transmitting means)
23 Authentication part (transfer means, authentication means)
24 Password transmission unit (transmission means, fifth transmission means)
25 Password DB
26 Log DB
27 Authentication DB (storage means)
30 Receiver mobile terminal (first receiving terminal)
31 Access information receiver (third transmitting means)
32 Password request part (fourth transmission means)
33 Password receiver (fifth transmission means)
34 Password transmitter 40 Receiver terminal (second receiver terminal)
41 File receiver (second transmission means)
42 Access information transmitter (third transmitter)
43 Password receiver

Claims (7)

From the transmitting terminal to send the encrypted file, it receives the decryption password for decrypting the encrypted file, receiving means first receiving terminal in association with the access data for obtaining the decryption password When,
Based on the transmitted the access data in conjunction with the second the encrypted file to the receiving terminal in the first path from the transmitting terminal, said first Keru accepting means to accept any access from the receiving terminal,
A password notification device comprising: a transmission unit configured to transmit the decryption password associated with the access data to the first reception terminal through a second path in response to the reception of the access by the reception unit; . The password notification device according to claim 1 , further comprising a generating unit that generates the access data and notifies the transmitting terminal in response to receiving the decryption password by the receiving unit. 3. The password notification device according to claim 1, wherein the accepting unit obtains identification data for identifying a user of the first receiving terminal when accepting access from the first receiving terminal. 4. Storage means for storing identification data for identifying a user who is permitted to receive the decryption password;
An authentication unit that authenticates the identification data received by the receiving unit with the identification data stored in the storage unit;
The password notification device according to claim 3 , wherein the transmission unit transmits the decryption password when identification data is authenticated by the authentication unit. Transfer means for transferring the identification data received by the reception means to the transmission terminal;
Authentication means for receiving authentication data indicating that the user identified by the identification data is permitted to receive the decryption password from the transmission terminal; and
The password notification device according to claim 3 , wherein the transmission unit transmits the decryption password when the authentication data is received by the authentication unit. When the transmission unit acquires data indicating a transmission destination as the identification data by the reception unit, the transmission unit transmits the decryption password to the transmission destination, and does not acquire data indicating the transmission destination. The password notification device according to claim 3 , wherein the decryption password is transmitted to the first receiving terminal. A transmitting terminal that transmits the encrypted file; a password notification device that notifies the decryption password for decrypting the encrypted file; a first receiving terminal that receives the decrypted password; and a first terminal that receives the encrypted file. A password notification system comprising: 2 receiving terminals;
First transmission means for transmitting the decryption password from the transmission terminal to the password notification device;
Storage means for storing the password notification device in association with the access data for acquiring the decryption password;
A second transmission means for transmitting the encrypted file and before Kia access data, in the first path from the transmitting terminal to the second receiving terminal,
Third transmitting means for transmitting the access data from the second receiving terminal to the first receiving terminal;
Fourth transmission means for the first receiving terminal to access the password notification device based on the access data and transmit the request for the decryption password ;
In response to the password notification device accepting access from the first receiving terminal, the decryption password associated with the access data is sent from the password notification device to the first receiving terminal. And a fifth transmission means for transmitting via the path.

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