JP2015154263A - Facsimile transmitting device, facsimile receiving device and facsimile transmitting/receiving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a facsimile device having higher security in comparison with the prior arts regarding facsimile communications.SOLUTION: A facsimile device 1 includes: a first communication section 70 capable of performing communications via a public switched telephone network; a second communication section 80 capable of performing communications via the Internet; an encryption section 103; and a transmission control section 107. In the encryption section 103, image data subjected to facsimile transmission are encrypted by a first encryption key to generate first encrypted data, and the first encryption key is encrypted by a second encryption key different from the first encryption key to generate second encrypted data. The transmission control section 107 causes the first communication section 70 to transmit the second encrypted data to another facsimile device and causes the second communication section 80 to transmit the first encrypted data and the second encryption key to the other facsimile device.

Description

  The present invention relates to a facsimile transmission apparatus, a facsimile reception apparatus, and a facsimile transmission / reception apparatus, and more particularly to a security technique in facsimile communication.

  In recent years, a facsimile apparatus having a so-called Internet facsimile function for performing facsimile communication using an Internet network in addition to a conventional facsimile function for performing facsimile communication using a public switched telephone network (PSTN) has appeared. Yes. However, facsimile communication using the Internet network is less secure than facsimile communication using a conventional public switched telephone network and may be intercepted by a third party.

  Regarding the above problem, Patent Document 1 discloses that after encrypting image data to be transmitted by facsimile, the encrypted data is transmitted using the Internet network, and the encryption key used for the encryption is used for the public switched telephone network. A technique for transmitting data using a message is disclosed. In the facsimile machine on the receiving side, the encrypted data received using the Internet network is decrypted with the encryption key received using the public switched telephone network to obtain image data. Since the encryption key is transmitted using a communication path different from the Internet network, the security is superior compared to the case where data communication is simply performed using the Internet network.

JP 2008-61164 A

  However, even when the facsimile communication is performed using the technique described in Patent Document 1, if both the encrypted data and the encryption key are intercepted, the image is sent to a third party. Data may be read. For this reason, facsimile communication is required to further improve security.

  The present invention has been made in view of the above circumstances, and relates to facsimile communication, and has an object to provide a facsimile transmission device, a facsimile reception device, and a facsimile transmission / reception device having higher security than conventional techniques. And

  A facsimile transmission apparatus according to one aspect of the present invention includes a first communication unit capable of communication via a public switched telephone network, a second communication unit capable of communication via an Internet network, and a facsimile transmission target. An image data acquisition unit for acquiring the image data; and generating the first encrypted data by encrypting the image data with a first encryption key, and using the first encryption key as the first encryption key. Encrypting with a different second encryption key to generate second encrypted data, causing the first communication unit to transmit the second encrypted data to another facsimile machine, and And a transmission control unit that causes a second communication unit to transmit the first encrypted data and the second encryption key to the other facsimile device.

  A facsimile receiving apparatus according to another aspect of the present invention includes a first communication unit capable of communication via a public switched telephone network, a second communication unit capable of communication via an Internet network, The first communication unit receives the second encrypted data transmitted from another facsimile apparatus via the public switched telephone network, and the second communication unit causes the other communication apparatus to transmit the second encrypted data via the Internet network. The reception control unit for receiving the first encrypted data and the second encryption key transmitted in this manner, and the second communication unit received the second encrypted data received by the first communication unit The first cipher received by the second communication unit using the first cipher key obtained by decrypting using the second cipher key to obtain the first cipher key The decoded image data to decode the image data. A decoding unit to obtain a facsimile reception device comprising a.

  A facsimile transmission / reception apparatus according to another aspect of the present invention includes the facsimile transmission apparatus and the facsimile reception apparatus.

  According to the facsimile transmission apparatus, the facsimile reception apparatus, and the facsimile transmission / reception apparatus according to the above aspect of the present invention, the facsimile communication has higher security than the conventional technology.

1 is a perspective view showing an external appearance of a facsimile apparatus according to an embodiment of the present invention. 1 is a block diagram showing an internal configuration of a facsimile apparatus according to an embodiment of the present invention. FIG. 2 is a front view showing an appearance of a display unit and an operation unit of the facsimile apparatus according to the embodiment of the present invention. It is a flowchart which shows the flow of the data transmission by the facsimile communication in the facsimile apparatus concerning one Embodiment of this invention. It is a figure which shows an example of the menu screen displayed when receiving the address of the facsimile apparatus of a transmission destination on the display part of the facsimile apparatus concerning one Embodiment of this invention. It is a figure which shows an example of the selection screen of the double encryption function displayed on the display part of the facsimile apparatus concerning one Embodiment of this invention. It is a figure which shows the content of the double encryption process in the facsimile apparatus concerning one Embodiment of this invention. It is a figure which shows the content of the transmission process of the encrypted data in the facsimile apparatus concerning one Embodiment of this invention. It is a flowchart which shows the flow of the data reception by the facsimile communication in the facsimile apparatus concerning one Embodiment of this invention. It is a figure which shows the content of the decoding process in the facsimile apparatus concerning one Embodiment of this invention. It is a flowchart which shows the flow of the data reception in the facsimile apparatus concerning a modification.

  A facsimile apparatus (facsimile transmission / reception apparatus) according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing the appearance of a facsimile apparatus according to an embodiment of the present invention. FIG. 2 is a block diagram showing an internal configuration of the facsimile apparatus according to the embodiment of the present invention.

  The facsimile apparatus 1 is a multifunction machine having a plurality of functions such as a copy function, a printer function, and a scanner function in addition to a facsimile function. As shown in FIG. 1, the facsimile apparatus 1 includes an apparatus main body 2, an image reading unit 10 disposed above the apparatus main body 2, and a connecting unit 3 provided between the image reading unit 10 and the apparatus main body 2. And is roughly composed of

  The image reading unit 10 is an ADF (Auto Document Feeder) having a document transport unit 6 and a scanner that optically reads a document transported by the document transport unit 6 or a document placed on contact glass (not shown). is there. The image reading unit 10 is an example of an image data acquisition unit, and acquires image data to be transmitted by facsimile by reading a document to be transmitted by facsimile one by one. Note that image data transmitted from a personal computer or the like connected to the facsimile apparatus 1 via a network and received via a second communication unit 80 described later is also a facsimile transmission target. In this case, the second communication unit 80 serves as the above-described image data acquisition unit.

  The image memory 20 is an area for temporarily storing image data to be subjected to facsimile transmission such as image data of a document read by the image reading unit 10 and image data received via the second communication unit 80. It is. Further, the image memory 20 may be an area for temporarily storing image data transmitted from another facsimile apparatus by facsimile communication and received via a first communication unit 70 or a second communication unit 80 described later. Function. The image data is to be printed by the image forming unit 30.

  The image forming unit 30 reads the image data stored in the image memory 20 and forms (prints) an image on a sheet supplied from the sheet feeding unit 4 using the image data. The printed paper is discharged to the discharge tray 5.

  The display unit 40 is disposed on the front side of the facsimile machine 1 and includes a liquid crystal display (LCD) and an organic EL (Organic Light-Emitting Diode) display. As shown in FIG. 3, the display unit 40 displays a menu screen or the like for accepting settings related to facsimile transmission and facsimile reception.

  The operation unit 50 includes, for example, a start key for instructing the start of facsimile transmission and the reading of a document, a determination key (enter key) for performing a confirmation operation on a GUI constituting the menu screen, and a numerical value input. Numerical value input keys and the like, and accepts an operation on a menu screen displayed on the display unit 40 from the user.

  The storage unit 60 is a large-capacity storage device such as an HDD (Hard Disk Drive).

  The first communication unit 70 includes an encoding / decoding unit (not shown), a modulation / demodulation unit, an NCU (Network Control Unit), and the like, and is controlled by the communication control unit 106 of the control unit 100 described later under a public switched telephone. Facsimile transmission and reception using the network.

  The second communication unit 80 includes a communication module such as a LAN chip, and performs facsimile communication and facsimile reception using the Internet network under the control of the communication control unit 106.

  The facsimile machine 1 further includes a control unit 100. The control unit 100 includes a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), and the like. The control unit 100 is configured such that the control unit 101, the encryption key generation unit 102, the encryption unit 103, the decryption unit 104, the facsimile control program stored in the ROM or the storage unit 60 is executed by the CPU. It functions as a storage control unit 105 and a communication control unit 106. Note that the control unit 101, the encryption key generation unit 102, the encryption unit 103, the decryption unit 104, the storage control unit 105, and the communication control unit 106 of the control unit 100 do not depend on the operation based on the above-described facsimile control program. Each may be configured by a hard circuit.

  The control unit 101 governs overall operation control of the facsimile apparatus 1. The control unit 101 is connected to the image reading unit 10, the image memory 20, the image forming unit 30, the display unit 40, the operation unit 50, the storage unit 60, the first communication unit 70, the second communication unit 80, and the like. In addition, operation control of each of the connected mechanisms and transmission / reception of signals or data to / from each mechanism are performed.

  The encryption key generation unit 102 generates a random number (arithmetic random number) based on a predetermined algorithm, and generates an encryption key using the generated random number. The encryption key generation unit 102 stores the generated encryption key in the storage unit 60. In this case, the storage unit 60 functions as an encryption key storage unit. Note that a random number (physical random number) may be generated by a random number generation circuit such as an oscillation circuit, and an encryption key may be generated using the generated physical random number.

  The encryption unit 103 randomly selects two encryption keys from the plurality of encryption keys stored in the storage unit 60, and uses the selected encryption keys as the first encryption key and the second encryption key. Thus, the image data to be transmitted by facsimile is double-encrypted. Specifically, the encryption unit 103 encrypts image data to be transmitted by facsimile with a first encryption key to generate first encrypted data, and uses the first encryption key as the first encryption key. The second encrypted data is generated by encrypting with a second encryption key different from.

  The decryption unit 104 decrypts the encrypted data transmitted from another facsimile apparatus and received via the first communication unit 70 and the second communication unit 80. Specifically, the decryption unit 104 transmits the second encrypted data transmitted via the public switched telephone network and received via the first communication unit 70 via the Internet network. The second encryption key received via the second communication unit 80 is used for decryption to obtain the first encryption key. The decryption unit 104 decrypts the first encrypted data transmitted via the Internet network and received via the second communication unit 80, using the first encryption key obtained by decryption. To obtain image data.

  The storage control unit 105 controls the storage unit 60 to cause the storage unit 60 to store or delete data received via the first communication unit and the second communication unit.

  The communication control unit 106 includes a transmission control unit 107 and a reception control unit 108, and controls transmission / reception of data by facsimile communication via the first communication unit 70 and the second communication unit 80.

  The transmission control unit 107 transmits the encrypted data generated by the encryption unit 103 to another facsimile apparatus using two communication networks, the public switched telephone network and the Internet network. Specifically, the transmission control unit 107 causes the first communication unit 70 to transmit the second encrypted data to another facsimile apparatus using the public switched telephone network, and causes the second communication unit 80 to transmit the first encrypted data. The encrypted data and the second encryption key are transmitted to the other facsimile apparatus using the Internet network.

  The reception control unit 108 has a function of causing the first communication unit 70 and the second communication unit 80 to receive the encrypted data transmitted from the other facsimile apparatus 1. Specifically, the reception control unit 108 causes the first communication unit 70 to receive the second encrypted data transmitted via the public switched telephone network, and causes the second communication unit 80 to connect to the Internet network. The first encrypted data and the second encryption key transmitted via the network are received.

  Next, the operation of the facsimile machine 1 having the above configuration will be described. First, data transmission processing by the facsimile apparatus 1 will be described. FIG. 4 is a flowchart showing a flow of data transmission by facsimile communication in the facsimile apparatus 1.

  First, the control unit 101 of the facsimile apparatus 1 receives an address (destination) of a facsimile apparatus to which image data is transmitted (step S10). FIG. 5 is a diagram illustrating an example of a menu screen displayed on the display unit 40 when an address of a destination facsimile apparatus is received. In the example illustrated in FIG. 5, the menu screen D <b> 1 is displayed on the display unit 40 under the control of the control unit 101. The menu screen D1 is provided with a destination input field d1 in which the destination of the destination facsimile apparatus can be input. The control unit 101 receives the destination input in the destination input field d1 using the operation unit 50 or the touch panel function as the destination of the destination facsimile apparatus.

  In addition, an address book selection button d2 is provided on the menu screen D1. When the control unit 101 receives selection of the button d2 using the operation unit 50 or the touch panel function, the control unit 101 causes the display unit 40 to display a list of destinations of the facsimile apparatus stored in the storage unit 60 as an address book. The control unit 101 accepts a destination selected from the address book as a destination of the destination facsimile apparatus.

  After receiving the destination of the destination facsimile machine, the control unit 101 determines whether or not the received destination facsimile machine has a double encryption function (step S11). Here, the double encryption function means a function capable of obtaining image data by decrypting the first encrypted data. In the storage unit 60, information on whether or not the facsimile apparatus has a double encryption function is stored together with the destination of the facsimile apparatus. The control unit 101 refers to the information stored in the storage unit 60 and determines whether or not the destination facsimile apparatus has a double encryption function.

  If the destination facsimile apparatus does not have the double encryption function (NO in step S11), the control unit 101 executes normal facsimile transmission processing (step S12). Since this process is a known technique, a description thereof will be omitted.

  If the destination facsimile apparatus has a double encryption function (NO in step S11), the control unit 101 displays a double encryption function selection screen (step S13), and the double encryption function. It is determined whether or not is selected (step S14). FIG. 6 is a diagram illustrating an example of a selection screen for the double encryption function displayed on the display unit 40. In the example illustrated in FIG. 6, the selection screen D <b> 2 is displayed on the display unit 40 under the control of the control unit 101. The selection screen D2 is provided with a setting field in which setting items (for example, file format) for transmitting data by facsimile communication can be changed. The control unit 101 receives the setting input in the security setting field d3 using the operation unit 50 or the touch panel function.

  If the selection of the double encryption function has not been accepted (NO in step S14), the control unit 101 executes normal facsimile transmission processing (step S12).

  When selection of the double encryption function is accepted (YES in step S14), control unit 101 determines whether or not the start key has been pressed (step S15). When the pressing of the start key is accepted (YES in step S15), the image reading unit 10 of the facsimile apparatus 1 reads a document to be transmitted by facsimile under the control of the control unit 101, and outputs image data to be transmitted by facsimile. Obtain (step S16).

  After acquiring the image data, the encryption unit 103 randomly selects two encryption keys (first encryption key) from among a plurality of encryption keys generated in advance by the encryption key generation unit 102 and stored in the storage unit 60. And the second encryption key) are selected (step S17). At this time, the encryption key is selected so that the first encryption key and the second encryption key are different.

  The encryption unit 103 uses the first encryption key and the second encryption key selected in the process of step S17 to double-encrypt image data to be transmitted by facsimile (steps S18 and S19).

  FIG. 7 is a diagram showing the contents of the double encryption processing. First, the encryption unit 103 encrypts the image data (the flower image in the example shown in FIG. 7) acquired in the process of step S16 using the first encryption key, and the first encrypted data is obtained. Generate (step S18).

  Next, the encryption unit 103 converts the first encryption key used for the encryption process in step S18 into an image code (in the example illustrated in FIG. 7, a QR code (registered trademark) image). Specifically, the encryption unit 103 generates an image code obtained by converting the digital information of the first encryption key into an array of colors (for example, black and white). Then, the encryption unit 103 encrypts the converted image code with the second encryption key to generate second encrypted data (step S19).

  After the image data is double-encrypted, the transmission control unit 107 generates an identification number for identifying the current facsimile communication from other communication (step S20).

  After the generation of the identification number, the transmission control unit 107 transmits the encrypted data together with the identification number to the first communication unit 70 and the second communication unit 80 (steps S21 and S22).

  FIG. 8 is a diagram showing the content of the encrypted data transmission process. First, the transmission control unit 107 causes the first communication unit 70 to transmit the second encrypted data and the identification number to another facsimile machine (step S21). The second encrypted data and the identification number are received by the receiving facsimile machine via the public switched telephone network.

  Then, the transmission control unit 107 causes the second communication unit 80 to transmit the first encrypted data, the second encryption key, and the identification number to another facsimile machine (step S22). For example, the transmission control unit 107 creates an email in which the second encryption key and the identification number are described in the header part and the body part and the first encrypted data is attached, and the created email is Send to a facsimile machine. The first encrypted data, the second encryption key, and the identification number are received by the receiving facsimile apparatus via the Internet network.

  After the transmission of the encrypted data, the encryption key generation unit 102 selects the first encryption key and the second encryption key used for the current facsimile communication from the plurality of encryption keys stored in the storage unit 60. Is deleted (step S23).

  Then, the encryption key generation unit 102 newly generates a plurality of encryption keys, and stores the generated plurality of encryption keys in the storage unit 60 (step S24).

  Thus, the security in facsimile communication can be improved by disposing the encryption key for each communication and not using the same encryption key. Further, the facsimile apparatus 1 does not perform the process of generating the encryption key (step S24) during the process of transmitting the encrypted data (steps S16 to S22), but transmits the encrypted data. After the processing is completed, the generated encryption key is stored in the storage unit 60. When transmitting the encrypted data, it is only necessary to select an encryption key from a plurality of encryption keys stored in the storage unit 60, and it does not take time to generate the encryption key. The time required for the transmission process can be shortened.

  Next, data reception processing by the facsimile apparatus 1 will be described. FIG. 9 is a flowchart showing a flow of data reception by facsimile communication in the facsimile apparatus 1.

  First, the reception control unit 108 causes the first communication unit 70 and the second communication unit 80 to receive encrypted data transmitted from another facsimile machine (steps S30 to S33).

  The reception control unit 108 causes the first communication unit 70 to receive the second encrypted data and the identification number transmitted from the other facsimile apparatus via the public switched telephone network (step S30).

  After the process of step S30, the storage control unit 105 stores the received second encrypted data in the storage unit 60 in association with the identification number (step S31).

  The reception control unit 108 causes the second communication unit 80 to receive the first encrypted data, the second encryption key, and the identification number transmitted from the other facsimile apparatus via the Internet network (step S31). ). Here, the reception control unit 108 receives the first encrypted data, the second encryption key, and the identification number as e-mail, for example. In this case, the reception control unit 108 acquires the second encryption key and the identification number from the information described in the header part and body part of the email, and obtains the first encrypted data from the file attached to the email. get.

  After the process of step S31, the storage control unit 105 stores the received first encrypted data and second encryption key in the storage unit 60 in association with the identification number (step S33).

  After receiving the encrypted data transmitted from the other facsimile apparatus, the decryption unit 104 stores the second encrypted data corresponding to the identification number matching the identification number received simultaneously with the second encryption key in the storage unit. It is determined whether it is stored in 60 (step S34).

  If the identification numbers do not match (NO in step S34), the encrypted data and the encryption key corresponding to the encrypted data do not match, so the decryption process is not executed.

  When the identification numbers match (YES in step S34), the decryption unit 104 decrypts the encrypted data using the received encryption key (steps S35 to S38).

  FIG. 10 is a diagram showing the contents of the decryption process. The decryption unit 104 receives the second encrypted data received via the public switched telephone network in the process of step S30, and the second encryption key received via the Internet network in the process of step S32. And decrypting it (step S35). By this decryption process, the decryption unit 104 acquires an image code corresponding to the first encryption key (in the example illustrated in FIG. 10, a QR code (registered trademark) image).

  The image forming unit 30 prints (images) an image code corresponding to the first encryption key under the control of the control unit 101 (step S36).

  Thereafter, the image reading unit 10 reads the printed image code under the control of the control unit 101. Then, the decryption unit 104 obtains the first encryption key from the read image code color (for example, black and white) arrangement pattern or the like (step S37).

  In the above, a case where the first encryption key is obtained by printing image data such as a QR code (registered trademark) image obtained by decrypting the second encrypted data and reading the printed image. As described above, without printing image data such as a QR code (registered trademark) image, the decoding unit 104 directly decodes image data such as a QR code (registered trademark) image obtained by decoding. The first encryption key may be acquired.

  After obtaining the first encryption key, the decryption unit 104 decrypts the first encrypted data received via the Internet network in the process of step S32 using the first encryption key, and the image data (A flower image in the example shown in FIG. 10) is acquired (step S38).

  After acquiring the image data, the image forming unit 30 prints the acquired image data (image formation) under the control of the control unit 101 (step S39). Instead of printing the acquired image data, it may be stored in the storage unit 60 as a TIFF (Tagged Image File Format) file or a PDF (Portable Document Format) file.

  As described above, according to the facsimile apparatus 1 according to the present embodiment, image data to be transmitted by facsimile is double-encrypted. The encrypted data (first encrypted data) that has been double-encrypted and the encryption key (second encrypted data, second encryption key) that was used for the double-encryption are communicated separately. Transmission is performed using a network (public switched telephone network and Internet network). For this reason, even if one of the communication networks is hacked and data is intercepted by a third party, the contents cannot be read. Even if both communication networks are hacked and the first encrypted data, the second encrypted data, and the second encryption key are intercepted by a third party, the first encryption Since the data is double-encrypted, its contents are not easily read. For this reason, the facsimile apparatus 1 encrypts the image data to be transmitted by facsimile, and then transmits the encrypted data using the Internet network, and uses the public exchange telephone network for the encryption key used for the encryption. Compared with a conventional facsimile apparatus for transmission, it has higher security.

  The present invention is not limited to the configuration of the above embodiment, and various modifications can be made. FIG. 11 is a flowchart showing a flow of data reception in the facsimile apparatus according to the modification. Note that description of processing similar to that described in the flowchart illustrated in FIG. 9 is omitted.

  The storage control unit 105 stores the received second encrypted data in the storage unit 60 in association with the identification number (step S41). Then, the storage control unit 105 determines a predetermined time from the time when the second encrypted data and the identification number are received until the first encrypted data, the second encryption key, and the identification number are received. It is determined whether or not it has elapsed (step S42).

  When the predetermined time has elapsed (YES in step S42), the storage control unit 105 causes the storage unit 60 to delete the second encryption key and the identification number stored in the storage unit 60 (step S51).

  After the processing in step S51, the transmission control unit 107 causes the first communication unit 70 or the second communication unit 80 to transmit notification information notifying that the decryption of the encrypted data has failed to the other facsimile apparatus. (Step S52).

  Further, after receiving the encrypted data transmitted from the other facsimile apparatus, the decryption unit 104 generates the second encrypted data corresponding to the identification number matching the identification number received simultaneously with the second encryption key. Even when the identification numbers do not match when it is determined whether or not they are stored in the storage unit 60 (NO in step S45), the processes in steps S51 and S52 are performed.

  In the above description, the case where the second encrypted data and the identification number are received prior to the first encrypted data and the second encryption key and the identification number has been described. When the second encryption key and the identification number are received before the second encrypted data and the identification number, the storage control unit 105 determines the first encrypted data, the second encryption key, and the identification number. It is determined whether or not a predetermined time has elapsed from the time when the second encrypted data and the identification number are received. In this case, the storage control unit 105 causes the storage unit 60 to delete the first encrypted data, the second encryption key, and the identification number stored in the storage unit 60.

  As described above, when a predetermined time elapses between receiving the second encrypted data, one of the first encrypted data and the second encryption key and receiving the other, or When the decryption of the first encrypted data or the second encrypted data fails, the security can be improved by deleting the data stored in the storage unit 60. In addition, by transmitting the above notification information to the facsimile machine 1 on the transmission side, it is possible to notify the user on the transmission side that the decryption of the encrypted data has failed.

  In the above embodiment, the transmission-side facsimile apparatus 1 converts the first encryption key into an image code such as a QR code (registered trademark) image, and converts the converted image code into the second encryption key. To generate second encrypted data. Then, the reception side facsimile apparatus 1 prints an image code such as a QR code (registered trademark) image obtained by decrypting the second encrypted data, and reads the printed image to obtain the first encryption key. Is getting. However, the present invention is not necessarily limited to this case.

  In the facsimile apparatus 1 on the transmission side, the first encryption key is encrypted with the second encryption key without converting the first encryption key into an image code such as a QR code (registered trademark) image. Generated data may be generated. In this case, the receiving facsimile apparatus 1 can obtain the first encryption key only by decrypting the second encrypted data with the second encryption key, so that the image code such as a QR code (registered trademark) image or the like can be obtained. There is no need to perform the process of printing or reading the printed image code.

  In the above embodiment, information on whether or not the facsimile apparatus has the double encryption function is stored in the storage unit 60 together with the destination of the facsimile apparatus, and the control unit 101 stores the information in the storage unit 60. By referring to the information, it is determined whether or not the destination facsimile apparatus has a double encryption function. However, the present invention is not necessarily limited to this case.

  In the facsimile communication using the public switched telephone network, capability information and the like implemented by the transmission side facsimile apparatus and the reception side facsimile apparatus are transferred based on a predetermined communication protocol prior to data transmission. The control unit 101 may determine whether or not the destination facsimile apparatus has a double encryption function with reference to the capability information.

  In this way, even if the information indicating whether or not the facsimile apparatus 1 has the double encryption function is not stored in the storage unit 60, the destination facsimile apparatus has the double encryption function. It can be determined whether or not.

DESCRIPTION OF SYMBOLS 1 Facsimile apparatus 10 Image reading part 30 Image forming part 40 Display part 50 Operation part 60 Storage part 70 1st communication part 80 2nd communication part 100 Control unit 101 Control part 102 Encryption key generation part 103 Encryption part 104 Decryption Unit 105 storage control unit 106 communication control unit 107 transmission control unit 108 reception control unit

Claims (9)

A first communication unit capable of communicating via a public switched telephone network;
A second communication unit capable of communication via the Internet network;
An image data acquisition unit for acquiring image data to be transmitted by facsimile;
The image data is encrypted with a first encryption key to generate first encrypted data, and the first encryption key is encrypted with a second encryption key different from the first encryption key. An encryption unit for generating encrypted data of 2;
The first communication unit transmits the second encrypted data to another facsimile apparatus, and the second communication unit receives the first encrypted data and the second encryption key from the other facsimile. A facsimile transmission apparatus comprising: a transmission control unit configured to transmit to the apparatus. An encryption key storage unit for storing a plurality of encryption keys;
The plurality of encryption keys stored in the encryption key storage unit at a timing when the transmission control unit transmits the first encrypted data, the second encrypted data, and the second encryption key. An encryption key generation unit that deletes the first encryption key and the second encryption key used in the transmission, and generates a new encryption key and stores the new encryption key in the encryption key storage unit, In addition,
The encryption unit randomly selects two encryption keys from the plurality of encryption keys stored in the encryption key storage unit, and selects the selected encryption key and the first encryption key as the first encryption key. The facsimile transmission apparatus according to claim 1, wherein the facsimile transmission apparatus is used as a second encryption key.   The facsimile transmission device according to claim 1, wherein the encryption unit generates the second encrypted data by encrypting an image code indicating the first encryption key with the second encryption key. A first communication unit capable of communicating via a public switched telephone network;
A second communication unit capable of communication via the Internet network;
The first communication unit receives the second encrypted data transmitted from another facsimile apparatus via the public switched telephone network, and the second communication unit causes the other communication apparatus to transmit the second encrypted data via the Internet network. A reception control section for receiving the first encrypted data and the second encryption key transmitted
The second encrypted data received by the first communication unit is decrypted using the second encryption key received by the second communication unit to obtain the first encryption key and decryption And a decryption unit that decrypts the first encrypted data received by the second communication unit using the first encryption key obtained in this way to obtain the image data.   The decryption unit obtains the first encryption key by decoding an image code obtained when the second encrypted data is decrypted using the second encryption key. The facsimile receiving apparatus described. A first communication unit capable of communicating via a public switched telephone network;
A second communication unit capable of communication via the Internet network;
An image data acquisition unit for acquiring image data to be transmitted by facsimile;
The image data is encrypted with a first encryption key to generate first encrypted data, and the first encryption key is encrypted with a second encryption key different from the first encryption key. An encryption unit for generating encrypted data of 2;
The first communication unit transmits the second encrypted data to another facsimile apparatus, and the second communication unit receives the first encrypted data and the second encryption key from the other facsimile. A transmission control unit for transmitting to the device;
A reception control unit that causes the first communication unit to receive the second encrypted data, and causes the second communication unit to receive the first encrypted data and the second encryption key;
The second encrypted data received by the first communication unit is decrypted using the second encryption key received by the second communication unit to obtain the first encryption key and decryption And a decryption unit that decrypts the first encrypted data received by the second communication unit using the first encryption key obtained in this way and obtains the image data. The transmission control unit causes the first communication unit to transmit an identification number for identifying communication in addition to the second encrypted data, and causes the second communication unit to transmit the first encrypted data and the second encrypted data. In addition to the second encryption key, the same identification number as the identification number transmitted to the first communication unit is transmitted,
The decryption unit uses the second encryption key corresponding to the identification number that matches the identification number received by the first communication unit together with the second encrypted data, and uses the second encrypted data. The facsimile transmission / reception apparatus according to claim 6, wherein: The reception control unit receives device capability information of the other facsimile apparatus on the first communication unit based on a predetermined communication protocol prior to transmission of the second encrypted data by the transmission control unit. Let
The transmission control section indicates that the other facsimile apparatus has a function capable of obtaining the image data by decrypting the first encrypted data in the transmission capability information. The first communication unit transmits the second encrypted data to another facsimile apparatus, and the second communication unit receives the first encrypted data and the second encryption key. The facsimile transmission / reception apparatus according to claim 6, wherein the facsimile transmission / reception apparatus is transmitted to the other facsimile apparatus. The second encrypted data received by the first communication unit by the reception control unit, and the first encrypted data and the second encryption key received by the second communication unit. From storing the second encrypted data, the first encrypted data, and the second encryption key until the reception control unit receives the other after storing the storage unit Stored in the storage unit when a predetermined time elapses or when the decryption unit fails to decrypt the first encrypted data or the second encrypted data A storage control unit for deleting data;
The transmission control unit is configured to receive the second encrypted data, the first encrypted data, and the second encryption key from the reception unit to the other before receiving the other. When a predetermined time has elapsed, or when the decryption unit fails to decrypt the first encrypted data or the second encrypted data, the first communication unit or the second communication unit The facsimile transmission / reception apparatus according to claim 6, wherein the communication information is transmitted to another facsimile apparatus to notify the communication unit that the decryption of the encrypted data has failed.

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