JP3469932B2 - Cryptographic communication device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cryptographic communication device capable of encrypting information for communication.

[0002]

2. Description of the Related Art Conventionally, in a communication device such as a telephone, a wireless device, and a facsimile, in order to maintain confidentiality of communication and data, data is subjected to a predetermined encryption process using a preset encryption key to perform communication. So-called cryptographic communication is known.

In a facsimile machine, a specific communication partner (for example, a partner having a high communication frequency) is generally a one-touch key or a shortened number. Although the communication operation can be improved by registering with the above-mentioned one-touch key or abbreviated N
o. Corresponding to the FAX No. of the communication partner. At the same time, information about the encryption key can be registered, and the one-touch key or the shortened number can be registered. By the operation of, the encrypted communication can be specified at the same time.

In cryptographic communication, it is ideal to set a cryptographic key for each cryptographic communication partner. However, if the number of cryptographic communication communication partners is large, the number of registered cryptographic keys becomes enormous and the cryptographic key Since management becomes difficult, a method of effectively using a small number of encryption keys by assigning the same encryption key to a plurality of encrypted communication partners in duplicate is usually adopted.

In such a case, the facsimile apparatus is provided with an encryption key table in which the encryption key is registered corresponding to the index number, and the one-touch key or the shortened number is set. The index number of the encryption key table is registered as the information about the encryption key.

In addition, in the registration of the index number, usually, the index number for which the encryption key is not registered is substantially incapable of cryptographic communication. Therefore, if the encryption key is not registered, the index number cannot be registered. It has become.

[0007]

SUMMARY OF THE INVENTION In the above-mentioned conventional facsimile apparatus capable of cipher communication, the index number is assigned as a one-touch key or a shortened number. When the encryption key is not registered, the registration can be done only after the encryption key has been registered. Therefore, the index number can be set with the one-touch key or the abbreviated No. by a simple operation. It is difficult to register with.

Considering the operability of registration of the communication destination table and the encryption key table, it is preferable that the registration of the communication destination table and the registration of the encryption key table can be performed independently. The index number of the encryption key table is registered in the communication destination table, but the encryption key corresponding to the index number is not registered in the encryption key table, which may cause another problem that encrypted communication cannot be performed. There is a nature.

The present invention has been made in view of the above background and problems, and in the case where the communication destination table and the encryption key table can be registered by a simple operation and the encryption key is not registered during the encrypted communication. Another object of the present invention is to provide an encryption communication device capable of performing communication processing quickly and smoothly.

[0010]

According to the present invention, an encryption key storage means in which an encryption key table in which a plurality of encryption keys corresponding to index numbers are registered is rewritably stored, and communication is performed corresponding to an operation number. A communication destination storing means in which a communication destination table in which the communication number of the other party and the index number of the encryption key are registered is rewritably stored, and the communication destination storing means with the communication party corresponding to the operation number. A cryptographic communication device for performing cryptographic communication by encrypting information with a cryptographic key corresponding to an index number stored in a cryptographic key registration mode for registering the cryptographic key in the cryptographic key table and the communication destination table. Registration number setting means for switching and setting the communication partner registration mode for registering the communication number and the index number of the encryption key, and an index for inputting the index number. Number input means, encryption key input means for inputting the encryption key, operation number input means for inputting the operation number, and input by the encryption key input means when the encryption key registration mode is set The encryption key is registered in the encryption key table in association with the index number input by the index number input means, and when the communication partner registration mode is set, the index number input by the index number input means is set. A registration control means for registering in the communication destination table in correspondence with the operation number input by the operation number input means is provided (claim 1).

Further, according to the present invention, in the above-mentioned encrypted communication device, a registration judging means for judging whether or not an index number and an encryption key corresponding to a communication partner are registered at the time of the encrypted communication, and the registration judging means makes the index number or encryption. When it is determined that the key has not been registered, a warning means is provided for issuing a warning that the index number or the encryption key has not been registered (claim 2).

Further, according to the present invention, in the above-mentioned encrypted communication device, communication mode switching means for switching and setting an encrypted communication mode in which information is encrypted and transmitted / received and a normal communication mode in which information is transmitted / received without encryption, and the above registration. And a communication mode switching control means for setting the communication mode to the normal communication mode when the determination means determines that the index number or the encryption key is not registered (claim 3).

Further, according to the present invention, in the encryption communication device, mode switching means for switching and setting a communication mode for communicating the information and a registration mode for registering the communication destination table or the encryption key table, and the registration. When it is determined by the determining means that the index number or the encryption key is not registered at the time of encryption transmission, the mode is set to the registration mode, and the index number and the encryption key are registered,
And a mode switching control means for switching and setting the registration mode to the communication mode (claim 4).

[0014]

According to the invention described in claim 1, when the communication partner registration mode is set, the communication number of the communication partner and the index number of the encryption key table can be registered in the communication destination table and input. Corresponding to the operation number, the input index number is registered regardless of whether or not the corresponding encryption key is registered. On the other hand, when the encryption key registration mode is set, the encryption key can be registered in the encryption key table, and the encryption key input corresponding to the input index number is registered.

According to the second aspect of the invention, at the time of encrypted communication (when data is encrypted and transmitted or when encrypted data is received), the index number corresponding to the other party of the encrypted communication and the index number If it is determined whether the encryption key corresponding to the index number is registered, and if it is determined that either the index number or the encryption key is not registered, a warning that the index number or the encryption key is not registered is displayed. Be seen.

According to the third aspect of the invention, at the time of cipher transmission, it is judged whether or not the index number corresponding to the other party of the cipher communication and the cipher key corresponding to the index number are registered, and the index number or When it is determined that one of the encryption keys is in the unregistered state, the communication mode is switched to the normal communication mode, and the data communication by the normal communication becomes possible.

According to the fourth aspect of the invention , at the time of encrypted communication, it is judged whether or not the index number corresponding to the other party of the encrypted communication and the encryption key corresponding to the index number are registered, and the index number or If it is determined that any of the encryption keys is in the unregistered state, the mode is switched from the communication mode to the registration mode, and the unregistered index number is registered in the communication destination table or the unregistered encryption key table. It becomes possible to register to.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A cryptographic communication device according to the present invention will be described by taking a facsimile device as an example. Note that the present invention is not limited to a facsimile device, but includes an encryption key table and a communication destination table, and the index number of the encryption key table is registered as information of the encryption key in correspondence with the communication destination of the communication destination table. If applicable, it can be applied to a telephone, a wireless device, and any other encryption communication device.

FIG. 1 is a block diagram of a facsimile apparatus according to the present invention. The facsimile device 1 can send and receive encrypted data (hereinafter, referred to as encrypted communication),
Moreover, it is a G3 type facsimile capable of high-speed transmission. Further, the facsimile apparatus 1 is configured such that a personal computer 12 (hereinafter referred to as a personal computer 12) can be externally connected, and has a normal facsimile function and a personal computer communication function for performing processing in accordance with a command from the connected personal computer 12. . The facsimile machine
The present invention is not limited to the G3 type, and the present invention can be applied to the G4 type and other types of facsimiles corresponding to arbitrary standards.

The facsimile apparatus 1 includes a scanner section 2 for reading a document to be transmitted to a facsimile (FAX (Facsimile)) 14 as a transmission partner, data read by the scanner section 2 (hereinafter referred to as transmission data), and FAX 14 to FA.
X A printer unit 3 for printing transmitted data (hereinafter, referred to as received data) and data transmitted from an externally connected personal computer 12 (hereinafter, referred to as communication data) on a recording sheet, and predetermined for the above-mentioned transmitted / received data and communication data The data processing unit 4 for performing the data processing, the data transmission unit 5 for transmitting / receiving the transmission / reception data via the telephone line 13, and the control unit 6 for controlling the driving of the scanner unit 2 to the data transmission unit 5. .

The control unit 6 has an RS-232C interface 7, and the personal computer 12 has the RS-232C interface 7.
It is connected to the facsimile apparatus 1 via the C interface 7. The interface is RS-232 if it can be connected to the personal computer 12 in a communicable manner.
The interface is not limited to the C standard interface.

The control unit 6 has a built-in data buffer 601 for receiving the data transmitted from the personal computer 12, and a processing program for performing the above-mentioned facsimile function and personal computer communication function and various processing data ( For example, data relating to driving conditions such as the light emission amount of the light source of the scanner unit 2 and the developing density of the printer unit 3, data relating to messages such as warnings and operating procedures, etc. are recorded
An OM (Read Only Memory) 602 and a RAM (Random) for performing a predetermined arithmetic processing according to the above processing program.
Access Memory) 603 is built in.

The ROM 602 is equipped with a communication program capable of interpreting the AT command system and the command system recommended by the EIA (American Electronics Industry Association) and recommended as the class 1 command system and the class 2 command system. The device 1 is controlled by any one of the AT command system, the class 1 command system, and the class 2 command system from the personal computer 12. The command system is not limited to the above. Facsimile device 1
In consideration of the versatility of the communication function, the command system should be equipped every time the command system is newly standardized.

The facsimile machine 1 is provided with a command switch (SW) 8 for selecting the command system, and by operating the command SW8, a desired command system can be set. Command SW8 is
For example, when a DIP switch is used and the constituent bits of the DIP switch are set to codes corresponding to the above command systems, this code information is input to the control unit 6 and the communication command system with the personal computer 12 is command SW.
The command system designated by 8 is set.

Further, the facsimile machine 1 is provided with a numeric keypad,
Operation unit 9 consisting of key switches such as one-touch keys, L
CD (Liquid Crystal Display) and LED (Light Em
It is provided with a display unit 10 and a speaker 11 which are ited diodes, and control signals of the operation unit 9, the display unit 10 and the speaker 11 are input to and output from the control unit 6.

The scanner unit 2 is a CCD (Charge Coupled Dev.
ice) A line image sensor is provided as an image pickup unit and an image processing unit, and the image pickup unit is scanned relative to a document to read the document image line by line in the transport direction (row direction of the document), and the read data Is subjected to predetermined image processing such as level correction, γ correction and A / D conversion, and then output to the data processing unit 4.

The printer section 3 is irradiated with light from a light emitting section which converts a modulation signal generated based on the constituent data of an image to be printed (hereinafter referred to as a print image) into a laser beam and outputs the laser beam. A photosensitive section that forms a latent image of a print image by laser light, a developing section that visualizes the latent image of the print image formed on the photosensitive section, and a transfer that transfers the visualized print image to recording paper to form an image. And a fixing unit for fixing the print image transferred and formed on the recording paper.

The data processing unit 4 includes a memory 401 for storing transmitted / received data, a compression / decompression circuit 402 for compressing and decompressing data, an encryption / plainculture circuit for encrypting transmission data and plain culture of received data. 403, a data processing circuit 404 for controlling the compression / expansion of the transmitted / received data, the compression / decompression of the transmitted / received data, the encoding / decoding, and the encryption / plaintext processing.

The memory 401 is a large-capacity memory capable of storing, for example, about 100 A4 size standard originals, and is for enabling simultaneous reception during transmission / reception, confidential reception, reserved transmission, and the like. The compression / expansion circuit 402 uses CCIT
V. of the T (International Telegraph and Telephone Advisory Committee) It compresses transmission data and decompresses reception data based on the data compression method recommended by 42bis.

The encryption / plain culture circuit 403 performs data encryption and plain culture using a predetermined encryption key set in advance. The facsimile apparatus 1 has a cryptographic communication function of encrypting data in a substitutable encryption format and transmitting / receiving it. When the transmission / reception data and the encryption key are input from the data processing circuit 44 for encrypted communication, the encryption / plaintext circuit 403 converts the transmission data into an encryption word by word using the encryption key. Received data encrypted in units is converted to plain text.

The encryption key is registered in the encryption key table provided in the RAM 603 in the control section 6 by the user. Table 1 shows an example of the encryption key table. The encryption key table is the encryption number. And 1
It is composed of an encryption key consisting of a 0-digit number. Code N
o. Is the index number of the encryption table. Is equivalent to
The table shows that 10 encryption keys can be registered. The user selects one of the encryption numbers. An arbitrary 10-digit numerical value can be registered as an encryption key, and the encryption key can be changed or deleted as necessary. In addition, in the same table, the code No. 3 and 9 are in the unregistered state.

[0032]

[Table 1]

The data processing circuit 404 performs predetermined data processing on the transmission / reception data and the communication data based on the control signal of the control unit 6, and performs the data transmission of the data or the printout on the recording paper.

For example, when transmitting the contents of a document by facsimile, the data processing circuit 404 temporarily stores the data of the document image read by the scanner unit 2 in the memory 401. When the control unit 6 receives the transmission start timing signal, the data processing circuit 404 reads the transmission data from the memory 401, compresses the data at a predetermined compression rate by the compression / expansion circuit 402, and then encrypts the data from the control unit 6. Encrypt data encoded according to instruction / plain culture circuit 403
The data is encrypted by and output to the data transmission unit 5.

When the communication data transmitted from the personal computer 12 is to be transmitted by facsimile, the communication data is sent to the data processing circuit 404 via the control section 6, and the data processing circuit 404 instructs the control section 6 to perform the encryption. In accordance with the above, the communication data is encrypted by the encryption / plain culture circuit 403 and then output to the data transmission unit 5.

When performing facsimile reception, the data processing circuit 404 temporarily stores the data received by the data transmission section 5 in the memory 401. Control unit 6
When a recording start timing signal is input by the data processing circuit 404, the data processing circuit 404 reads the received data from the memory 401, and the received data is encrypted by the encryption / plain culture circuit 403 according to the plain culture instruction from the control unit 6. After culture
The data is output to the printer unit 3 after being expanded by the compression / expansion circuit 402 at a predetermined expansion ratio.

When the communication data transmitted from the personal computer 12 is printed out on the recording paper, the communication data is output to the printer unit 3 via the control unit 6 and the data processing circuit 404.

The data transmission unit 5 is a modem (MODEM (mo) that converts digital data to analog data.
A DCU / demodulator) 501 and an NCU (network control unit) 502 for selecting a partner station and connecting a line.

The operation unit 9 is used to send the FAX No. of the other party when the facsimile transmission is performed. Input, instruction to start / stop facsimile transmission, registration / change / deletion of the encryption key, one-touch key or abbreviated No. Is registered, confidential reception is set, and various other modes and conditions are set.

The one-touch key or the shortened number. In order to register the specific transmission partner, one-touch key No. Or shortened No. Is registered in advance, and the one-touch key No. Or shortened No. The purpose is to allow easy and quick facsimile transmission by inputting. One-touch key or shortened No.
In the registration (hereinafter, referred to as communication partner registration) of the one-touch key No. Or shortened No. Corresponding to the name of the recipient, FAX No. And the code No. Is registered, and the registered content is stored in the communication destination table of the RAM 603 built in the control unit 6.

Table 2 shows an example of the communication destination table. One-touch key No. in the table Corresponds to the number of the one-touch key 16 (see FIG. 2) provided on the operation unit 9 (the operation number at the time of facsimile transmission), and in the present embodiment, the transmission partner can be registered in ten one-touch keys. ing. In the table, the one-touch key No.
2, 4, 7, and 8 are unregistered, and one-touch key N
o. 1, 5, 6, 9 are registered by designating encrypted communication, and the one-touch key No. Nos. 3 and 10 are registered without specifying encrypted communication.

Encryption key No. Is the encryption number of the encryption key table (see Table 1) described above. Corresponding to the one-touch key No. For the transmission destination “ABCD” of No. 1, the data is the encryption number. Encryption key corresponding to 1 (= 0123456
789) and is transmitted and received after being encrypted. Note that the shortened No. Is also registered in the same manner as the table of Table 2. In this case, the one-touch key No. Instead of speed dial No.
Corresponding to the name of the recipient, FAX No. And code N
o. Is registered.

[0043]

[Table 2]

The display unit 10 displays the name of the recipient of the facsimile transmission, FAX No. , Presence / absence of encrypted communication, line connection status and transmission status information, input contents in encryption key registration and communication partner registration, unregistered status of encryption key in facsimile reception by encrypted communication, and personal computer 12
In addition to displaying various information such as a communication state with the character information, presence / absence of communication error, setting mode, received image quality, memory proxy reception, necessity of maintenance, etc. are displayed by indicators.

Further, the speaker 11 gives an alarm,
A part of the character information is transmitted by voice. For example, an alarm sound is generated at the end of facsimile transmission or at the start of facsimile reception. Further, when the corresponding encryption key is not registered at the time of facsimile transmission by facsimile communication or at the time of facsimile reception, a horn sound or a warning message with no encryption key registered is sounded.

FIG. 2 is a diagram showing an example of the operation unit and the display unit provided on the operation panel of the facsimile apparatus.

Ten one-touch keys 16 are arranged on the right side of the operation panel 15. Each one-touch key 16
The number attached to the one-touch key No. Is shown. L for displaying character information on the upper left side of the operation panel 15
A display plate 18 made of a CD is arranged, and a plurality of display lamps 17 made of LEDs and a sounding window 19 of a speaker are arranged above and below the display plate 18. Further below these are a selection key 20, a numeric keypad 21, a function key 22 and a start / start key.
Keys such as the stop key 23 are arranged.

The one-touch key 16 is a multi-function key. In addition to inputting, one-touch key or shortened No. It is possible to input character information such as the name of the other party in the registration of. The character information can be input by changing the input mode of the one-touch key 16 with the function key 203 in the selection key 20.

The indicator lamp 17 is provided with a plurality of LED indicators corresponding to, for example, communication error, memory reception, confidential reception, maintenance time, etc.
It is lit. Further, a plurality of LED displays are provided corresponding to the selection contents of the selection keys 201 and 202, and the LED corresponding to the contents selected by the selection keys 201 and 202 are provided.
Is lit.

The display panel 18 has information of several tens of characters.
It can be displayed across lines. A plurality of dots are arranged in a matrix at each character position, and a predetermined dot is turned on to display an arbitrary character.

The selection keys 201 and 202 are used, for example, to select levels such as the density of received image quality and halftone gradation, set various modes, and change the input mode of the multifunction key. For example, with the selection keys 201 and 202,
For example, a gradation level of a halftone such as a line density or a photograph is adjusted. In addition, a mode for registering an encryption key using the function key 203 (hereinafter referred to as an encryption key registration mode), a mode for performing communication partner registration (hereinafter referred to as a communication partner registration mode), and a communication mode to a facsimile mode Various modes such as automatic mode switching are set.

The automatic mode switching from the communication mode to the facsimile mode is automatically switched from the communication mode to the facsimile mode when a temporary process (for example, a process of using the facsimile device 1 as a printer) in the personal computer communication process in the communication mode is completed. This is to prevent the facsimile reception from failing due to a mistake in switching from the communication mode to the facsimile mode. When the automatic mode switching is instructed by the function key 203, the automatic switching from the communication mode to the facsimile mode is set.

The numeric keypad 21 is used for FAX N
o. , Code No. , Encryption key and shortened number. It is for inputting numerical values and code numbers such as.

The function key 22 is, for example, a mode for performing proxy reception by the memory 401, transmission / reception by normal facsimile (hereinafter referred to as a facsimile mode), or a mode for performing communication between the personal computers 12 (hereinafter referred to as a communication mode).
This is a key for setting various items and performing various functions such as pause / redial.

The start / stop key 23 is operated by pressing the numeric keypad 21 to display the FAX No. When the user inputs "" to perform facsimile transmission, the transmission start and the transmission stop are instructed. One-touch key or shortened No. If the transmission partner is designated by, the FAX No. of the transmission partner is automatically set without operating the start key 23. When is input and the line is connected, facsimile transmission is automatically started.

Returning to FIG. 1, the RS-232C interface 7 is connected to the personal computer 12 via the RS-232C cable.
Is for connecting. The control unit 6 is provided with a connection check circuit for checking the connection state (state of whether communication is possible or not) with the personal computer 12 at the time of setting the communication mode and during the setting, and an abnormal connection with the personal computer 12 is detected. Then, a warning is issued to the display unit 10 and the speaker 11.

FIG. 3 is a circuit diagram showing an example of the connection check circuit. The connection check circuit shown in FIG.
RC-232C in 232C interface 7
By checking a signal (hereinafter referred to as / DTR signal) input from the / DTR terminal of the connector 71, an abnormality in the connection state with the personal computer 12 is detected.

The / DTR terminal of the RC-232C connector 71 is always pulled up to a high level via the resistor R1.
When the personal computer 12 is connected via the 232C cable and the personal computer 12 is started, the / DTR terminal is inverted to the low level. That is, /
When the DTR signal can communicate with the personal computer 12,
When the level becomes low and communication with the personal computer 12 becomes impossible, the level becomes high. Therefore, / D
By checking the level change of the TR signal, the abnormality of the connection state with the personal computer 12 is detected. In addition, / DT
The state of the R signal may be reversed between low level and high level.

In the figure, an RS receiver 25 converts the level of the / DTR signal, and its output signal is substantially equivalent to the / DTR signal. Gate circuit 2
Reference numeral 6 is a circuit for fetching the / DTR signal output from the RS receiver 25 into the DATA terminal of the central processing circuit (hereinafter referred to as CPU) 28 of the control unit 6 when the communication mode is set. When the timing signal is input to the gate terminal G, the gate circuit 26 outputs the / DTR signal input to the input terminal IN to the output terminal OUT.

RD- of the CPU 28 is connected to the gate terminal G.
A timing signal for fetching the / DTR signal is input from the RS terminal. When the communication mode is set by the mode switching key 221, the CPU 28 makes the RD
-Send the capture timing signal from the RS terminal / DTR
A signal is taken in and it is determined from the level of this / DTR signal whether or not the connection state of the personal computer 12 is normal. When it is determined that the connection state with the personal computer 12 is abnormal, a warning message indicating the abnormal connection of the personal computer 12 is displayed on the display unit 10, and the speaker 11 issues a warning about the abnormal connection.

FIG. 5 is a flowchart for checking the connection abnormality of the personal computer 12 when the communication mode is set.

With the facsimile apparatus 1 set in the facsimile mode, the function key 2
When the communication mode is instructed by 03 (YES in step S1), the capture timing signal is input to the gate terminal G of the gate circuit 26 and the / DTR signal is captured (step S2).

Then, the connection state of the personal computer 12 is judged from the level of the / DTR signal (step S3), and if the connection state of the personal computer 12 is normal (YE at step S3).
S), the communication mode is set and the process returns (step S4). If the connection state of the personal computer 12 is abnormal (NO in step S3), the warning message shown in, for example, FIG. 6 is displayed on the display plate 18, and a whistle sound is generated from the speaker 11 to cause an abnormal connection state of the personal computer 12. After the warning is issued, the process returns (step S5). It should be noted that the connection abnormality warning may be performed by either one of voice and display.

The D flip-flop (hereinafter referred to as D-FF) 27 changes the level of the / DTR signal output from the RS receiver 25 during the communication mode setting period by the CPU.
It is a circuit for checking the connection state with the personal computer 12 during the communication mode setting period by inputting to the / INT terminal of 28. The output signal of the RS receiver 25 is D-FF2.
7 is input to the CLK terminal, the output signal of the / Q terminal of the D-FF 27 is input to the / INT terminal of the CPU 28, and D-
The D terminal and PR terminal of the FF 27 are set to a high level. Further, the / RESET signal output from the / RESET terminal of the CPU 28 (the signal that resets the / Q terminal output of the D-FF 27) is inverted and the CL of the D-FF 27 is cleared.
It is designed to be input to the R terminal.

FIG. 4 is a time chart for explaining the operation of the D-FF 27. First, the CPU / 28 outputs the / RESET signal to the D-FF 27 (see FIG. 4, A).
Point), after resetting the / Q terminal output of the D-FF 27,
The check of the connection state with the personal computer 12 during the communication mode setting period is started. During the communication mode setting period, if the power supply of the personal computer 12 is turned off or communication with the personal computer 12 becomes impossible due to the disconnection of the communication cable, the / DTR signal changes from the low level to the high level. Signal rising timing (Fig. 4, B
The inverted signal (low level) of the D terminal input at
It is output from the Q terminal and input to the / INT terminal of the CPU 28. When the input signal of the / INT terminal is inverted from the high level to the low level, the CPU 28 determines that the personal computer 1
2 detects that the communicable state has changed from the communicable state to the communicable state, and issues a warning to the display unit 10 and the speaker 11.

FIG. 7 is a flow chart for checking the connection abnormality of the personal computer 12 during the communication mode setting.

When the communication mode is instructed by the function key 203 and the communication mode is set (YES in step S10), the / RESET signal is input to the D-FF 26 and the / Q terminal output is reset. The check of the / DTR signal output from the Q terminal is started (step S11).

Subsequently, it is judged from the level change of the / DTR signal whether or not the connection abnormality of the personal computer 12 has occurred (step S12), and if the connection abnormality has occurred (YES in step S12), the above display is made. The computer 1 is displayed by displaying a warning message on the board 18 and a horn sound from the speaker 5.
After the warning of the abnormality of the connection state of No. 2 is given (step S1
3) and shifts to step S14. If no connection abnormality has occurred (NO in step S12), the above step S
13 is skipped and the process proceeds to step S14.

Subsequently, it is judged whether or not the facsimile mode is instructed by the function key 203 (step S14), and if the facsimile mode is instructed (YES in step S14), the facsimile mode is set and the process ends. (Step S15). If the facsimile mode is not instructed (NO in step S14), it is determined from the level state of the / DTR signal whether or not the connection abnormality is eliminated (step S16), and if the connection abnormality is not eliminated (step S16). So N
O), the process returns to step S13, and the warning of abnormal connection state is continued.

On the other hand, if the connection abnormality is resolved (YES in step S16), the warning of connection state abnormality is stopped (step S17), the process returns to step S10, and the connection abnormality of the personal computer 12 during the communication mode setting described above. Check is done.

In the above embodiment, during the communication mode setting period,
Although the / DTR signal is constantly monitored to check for an abnormality in the connection state of the personal computer 12, the / DTR signal may be periodically checked to check for an abnormality in the connection state of the personal computer 12. In this case, in FIG. 3, after setting the communication mode, the capture timing signal is input to the gate terminal G of the gate circuit 26 at a predetermined cycle to capture the / DTR signal into the DATA terminal of the CPU 28, and the / DTR signal You should check the level. This method eliminates the need for the D-FF 27 in FIG. 3 and thus has the advantage of simplifying the connection check circuit.

FIG. 8 is a flow chart for periodically checking the connection abnormality of the personal computer 12 during the setting period of the communication mode.

In FIG. 7, "/ DTR signal check start" in step S11 is changed to "/ DTR signal check" (step S11 ') in FIG. 7, and a predetermined cycle is set between step S10 and step S11'. The steps S10-1 to S10-4 for counting are inserted.

When the communication mode is instructed by the function key 203 and the communication mode is set (YES in step S10), the timer T built in the CPU 28 is set.
After m is reset and the count value Tc is set (steps S10-1, S10-2), the timer Tm starts counting (step S10-3).

When the time Tc is measured by the timer Tm (YES in step S10-4), the capture timing signal is input to the gate terminal G of the gate circuit 26 and the / DTR signal is captured (step S11 '). ),
From the level of the / DTR signal, it is judged whether or not a connection abnormality of the personal computer 12 has occurred (step S12).

If the connection abnormality of the personal computer 12 has occurred (YES in step S12), a warning of the connection state abnormality of the personal computer 12 is issued until the connection abnormality is resolved (loop of steps S12 to D16), and the connection is established. When the abnormality is resolved (YES in step S16), the warning of connection abnormality is stopped (step S17), the process returns to step S10, and the connection abnormality check of the personal computer 12 during the communication mode setting is performed. Further, if the facsimile mode is instructed during the warning of connection abnormality, the facsimile mode is set (step S15), and the process is ended.

Next, the registration processing in the communication partner registration mode will be described with reference to the flowchart of FIG.

When the communication partner registration mode is instructed by the function key 203 (YES in step S20).
S), the communication partner registration mode is set (step S
21). Then, the one-touch key No. Or shortened No.
Is determined (steps S22 and S2).
3), one-touch key No. Or shortened No. Is input (YES in step S22 or step S23),
N input by searching the communication destination table of the RAM 603
o. Is already registered (step S24).

The input No. If is not registered (YES in step S24), the process proceeds to step 26 and a new registration process is performed. That is, the operator is given the name of the other party, F
AX No. , Code No. And confidential Box No. Are sequentially requested, and when these inputs are completed (YES in steps S26 to S29), the input contents are displayed on the display unit 10 for confirmation (step S30). Note that the encryption No. And confidential Box No. Is the content that is set as necessary, so No. If is input without designation, it is determined that encrypted communication and confidential reception are not performed, and the registration contents are set.

The above content display is continued until the operator gives a registration instruction, and during this period, it is in a correctable state (loop of steps S26 to S31). Then, when a registration instruction is input from the operator, the contents of the set destination etc. correspond to the corresponding No. in the communication destination table of the RAM 603. After being registered in (step S32), the process proceeds to step S36.

On the other hand, the input No. If is already registered (YES in step S24), the process proceeds to step S33, and the process of changing or deleting the registered content is performed. That is,
After the registered content is displayed on the display unit 10 (step S3
3) When the operator is requested to change or delete the registered content and the function key 203 instructs the change of the registered content, the process proceeds to step S26, and the same processing as that at the time of new registration is performed. The contents are the corresponding No. of the communication destination table of the RAM 603. Is registered in (Step S
26-S32). When the deletion of the registered contents is instructed by the function key 203, after all the registered contents are deleted (step S35), the process proceeds to step S36.

Subsequently, it is judged whether or not the cancellation of the communication partner registration mode is instructed (step S36), and if the cancellation of the communication partner registration mode is instructed (step S36).
After the communication partner registration mode is canceled (step S37), the process returns to step S20. If cancellation of the communication partner registration mode has not been instructed (step S
If NO in 36), the process returns to step S22 to continue the registration process in the communication partner registration mode described above.

Next, the registration process in the encryption key registration mode will be described with reference to the flowchart of FIG.
When the encryption key registration mode is instructed by the function key 203 (YES in step S40), the encryption key registration mode is set (step S41). Subsequently, when the operator is requested to input the password and the operator inputs the correct password (YES in step S42 and step S43), the encryption key can be registered, and then,
Ask the operator to enter the encryption code. Is requested, and the code No. Is input (YES in step S44), the RAM 603
No. entered in the encryption key table is searched. Is already registered (step S4).
5).

The entered code No. If is not registered (YES in step S45), the process proceeds to step 46,
Perform new registration processing. That is, when the operator is requested to input the encryption key and the encryption key is input (step S46).
YES), the encryption key is the corresponding encryption number in the encryption key table of the RAM 603. After being registered in (Step S4
7) and proceeds to step S51.

On the other hand, the entered encryption number. If is already registered (YES in step S45), the process proceeds to step S33 to change or delete the registered content. That is, after the registered contents are displayed on the display unit 10 (step S
48), the operator is requested to change or delete the registered content (step S49), and the function key 20
When the instruction to change the registered content is given by step 3, step S4
6, the newly input encryption key is the corresponding encryption number in the encryption key table of the RAM 603. Is registered (steps S46, S47). Also, function key 2
When the deletion of the registered contents is instructed by 03, the registered encryption key is deleted (step S50), and then step S5.
Move to 1.

Subsequently, it is judged whether or not the cancellation of the encryption key registration mode is instructed (step S51), and if the cancellation of the encryption key registration mode is instructed (step S51).
After YES), the encryption key registration mode is released (step S52), and the process returns to step S40. If cancellation of the encryption key registration mode has not been instructed (N in step S51)
O), the process returns to step S44, and the above encryption key registration process is continued.

As described above, since the operation of registering, changing and deleting the communication partner is performed independently of the operation of registering, changing and deleting the encryption key, the communication partner registration mode and the encryption key registration are performed. Mode operation is easy and easy.

For example, a one-touch key or a shortened No. When registering or changing the password, the entered encryption number. Even if the encryption key corresponding to is not registered, No encryption key is registered without registering an encryption key for. Can be registered. Also, when deleting the encryption key, the encryption N
o. Is a one-touch key or shortened number. Even if it is registered in the one-touch key or the shortened number. Code No. registered in. Specified cipher N without deleting
o. The encryption key of can be deleted.

The one-touch key or the shortened number. When the encrypted communication is performed by the encryption No. If the encryption key corresponding to is not registered, as will be described later, a warning that the encryption key is not registered is issued during the encrypted communication, and the encryption registration can be performed according to the operator's selection.

Next, the data transmission / reception process in the facsimile mode will be described with reference to the flowcharts of FIGS. 11 and 12.

In the facsimile apparatus 1, the facsimile mode is set in the initial setting upon startup, and the communication mode is set if necessary. 11 and 12 show the processing when the facsimile device 1 is set to the facsimile mode.

If a document is set in the facsimile mode (YES in step S60), step 62
Then, the facsimile transmission process is performed, and the F
AX No. Is called (YE in step S61)
S), the process proceeds to step S90, and facsimile reception processing is performed.

In facsimile transmission, when the operator is requested to input the other party (step S62) and the other party is input (YES in step S62), the one-touch key No. Or shortened No. It is discriminated whether or not the input is made by (step S63), and the one-touch key No. Or shortened N
o. When the input is not made by the user, that is, by using the ten-key pad 21, the FAX No. of the other party is input. If is input (NO in step S63), normal communication in which data is not encrypted (hereinafter referred to as normal communication) is set (step S68), and the process proceeds to step S70.

One-touch key No. Or shortened No. When is input (YES in step S63), RAM6
03 one-touch key or shortened No. The registration table is searched to determine whether the communication partner is registered (step S64). If the communication partner is not registered (NO in step S64), the process proceeds to step S77, and the process in which the communication partner is not registered is performed.

When the process proceeds to step S77, first, a warning that the communication partner is not registered is given. This warning is issued, for example, by generating a horn sound from the speaker 5 and displaying a message such as "TOUSHIN ITEGASETE SALE TASTE IMAGE" on the display unit 9. Subsequently, it is determined whether or not the operator has designated the communication partner registration mode by the function key 203 (step S78),
If there is no instruction for the communication partner registration mode (step S78)
NO), and returns to step 62.

If the communication partner registration mode is instructed (YES in step S78), the communication partner registration mode is set (step S79), and after the above-described registration processing in the communication partner registration mode is performed (step S80), Return to step 64.

If the communication partner is registered (step S
64, YES), and the encryption number. Is determined (step S65), and the code No. is set. Is not set (NO in step S65), step S
The process shifts to 69, and the normal communication is set. Code No. If is set (YES in step S65), RAM
The encryption key table in 603 is searched to confirm whether the encryption key is registered (step S66).

If the encryption key is registered (YES in step S67), encryption communication is set (step S68), and the process proceeds to step 70. If the encryption key is not registered (NO in step S67). ), Step S
Then, the processing shifts to 81, in which the encryption key is not registered.

When the process proceeds to step S81, first, a warning that the encryption key is not registered is issued. This warning is issued by, for example, generating a horn sound from the speaker 5 and displaying a message such as "Angular Cursor Settings" on the display unit 9. Subsequently, it is determined whether or not the operator has instructed the normal communication by the function key 203 (step S82). When the normal communication is instructed (YES in step S82), the normal communication is set (step S83). ), Move to step 70,
Facsimile transmission processing is performed.

If normal communication is not instructed (step S
82, NO), and the operator presses the function key 20
3, it is determined whether or not the encryption key registration mode is instructed (step S84), and if there is no encryption key registration mode instruction (NO in step S84), the process returns to step 62,
If there is an instruction for the encryption key registration mode (Y in step S84
ES), the encryption key registration mode is set (step S8)
5) After the registration process in the encryption key registration mode described above is performed (step S86), the encryption communication is set (step S87), the process proceeds to step 70, and the facsimile transmission process is performed.

When the process proceeds to step S70, NCU50
2 is connected to the FAX 14 of the transmission partner via the telephone line 13 (step S70), and the facsimile transmission of the original is started. That is, the scanner unit 2 reads the document image (step S71), and the data processing unit 4 encodes the read data (transmission data) (step S72). Then, it is determined whether or not the encrypted communication is set (step S73), and when the encrypted communication is set (YES in step S73), the set encryption number. The transmission data is encrypted according to a predetermined encryption algorithm using the encryption key corresponding to (step S
74), and is transmitted to the FAX 14 of the other party via the data transmission unit 5 and the telephone line 13 (step S75). If the encrypted communication is not set (N in step S73
O), the transmission data is transmitted to the FAX 14 of the other party without performing the encryption processing (step S75).

Subsequently, it is judged whether or not there is a document to be transmitted (step S76), and if there is a document (step S76).
If YES in 76), the process returns to step S71, and the transmission process of the next document is performed. Then, when there are no more originals (NO in step S76), the process returns to step 60 because the facsimile transmission process is completed.

In facsimile reception, NCU50
2 is connected to the FAX 14 of the receiving party via the telephone line 13 (step S90), the data transmitted from the FAX 14 is received (step S91), and the received data is temporarily stored in the memory 401. (Step S
92).

Subsequently, it is judged whether or not the received data is encrypted communication from the receiving party (step S93). If it is not encrypted communication (NO in step S93), normal communication is set (step S97), In step S98, the received data is printed. If it is encrypted communication (YES in step S93), RAM 603
The encryption key table in is searched to confirm whether or not the encryption key is registered (step S94).

If the encryption key is registered (YES in step S95), encryption communication is set (step S96), the process proceeds to step 98, print processing of received data is performed, and the encryption key is registered. If not (NO in step S92), the process proceeds to step S104, and the process of unregistering the encryption key is performed.

When the process proceeds to step S104, first, a warning that the encryption key is not registered is issued. This warning is issued by, for example, generating a horn sound from the speaker 5 and displaying a message such as "Angular Cursor Settings" on the display unit 9. Subsequently, it is determined whether or not the encryption key registration mode is instructed by the operator using the function key 203 (step S105), and if there is no instruction of the encryption key registration mode (NO in step S105), the received data is printed. Return to step 60 without performing.

If the encryption key registration mode is instructed (YES in step S105), the encryption key registration mode is set (step S106), and after the above-described registration processing in the encryption key registration mode is performed (step S107). It is determined whether or not the operator has instructed to print the received data using the function key 203 (step S1).
08). If there is no print instruction (NO in step S108), the process returns to step 62 without printing the received data, and if there is a print instruction (step S1).
08: YES), encrypted communication is set (step S
109), the process proceeds to step 98, and print processing of the received data is performed.

When the process proceeds to step S98, the memory 40
Received data is read from 1. Then, it is judged whether or not the encrypted communication is set (step S9).
9) If encrypted communication is set (step S99)
If YES, the data processing unit 4 flattens the received data (step S100), and then decrypts the data (step S101). If the encrypted communication is not set (NO in step S99), the decryption of data is performed without performing the above-mentioned plain culture process (step S101).

Subsequently, the received data is output to the printer unit 3 and printed on the recording paper (step S102).
When the printout of the received data for one page is completed, it is determined whether or not the received data is completed (step S103). If the received data is not completed (NO in step S103), the process returns to step S102. The received data of the next page is printed out. When the printout of all the received data is completed (YES in step S103), the facsimile reception process is considered to be completed, and the process returns to step 62.

As described above, when transmitting / receiving data in the facsimile mode, the one-touch key or the shortened No. When a facsimile transmission is performed while the communication partner is not registered in, a warning that the communication partner is not registered is issued, and the communication partner can be registered at the time of the facsimile transmission. No. Facsimile transmission can be easily performed by a simple operation even if the communication partner is not registered in.

Also, in the encrypted communication, when data is transmitted / received in the facsimile mode in the state where the encryption key is not registered, a warning that the encryption key is not registered is issued,
Since the encryption key can be registered when transmitting / receiving the data, the data can be transmitted / received by the cryptographic communication by a simple operation even if the encryption key is not registered in advance.

Further, when the facsimile transmission by the encrypted communication is carried out in the state where the encryption key is not registered, the facsimile transmission can be carried out by switching to the normal communication, so that the facsimile transmission can be carried out by a simpler operation. You can do it.

[0113]

As described above, according to the present invention,
An encryption key storage means in which an encryption key table in which a plurality of encryption keys are registered corresponding to index numbers is rewritably stored, and a communication number of a communication partner and an index number of the above encryption key are registered corresponding to operation numbers. The communication destination table in which the stored communication destination table is rewritably stored, and information is stored between the communication destination corresponding to the operation number and the encryption key corresponding to the index number stored in the communication destination storage means. A cryptographic communication device that encrypts and performs cryptographic communication, and enables switching setting between a cryptographic key registration mode and a communication partner registration mode. In the communication partner registration mode, a corresponding operation number is supported. Enables registration of the input index number regardless of whether or not the encryption key is registered, while the encryption key registration mode corresponds to the input index number. Since to be registered an encryption key that has been input Te, carried out registration of the encryption key to the encryption key table and the registration of information about the encryption key to the communication destination table is independent,
The operability of registration in the communication partner registration mode and the encryption key registration mode is improved.

When the index number corresponding to the other party of the encrypted communication and the encryption key corresponding to the index number are registered or not during the encrypted communication, and either the index number or the encrypted key is in the unregistered state. In this case, since the warning that the index number or the encryption key is not registered is issued, the index number or the encryption key to be registered will not be left unregistered.

When the index number corresponding to the other party of the encryption communication and the encryption key corresponding to the index number are registered at the time of encryption transmission, and either the index number or the encryption key is not registered, Since the communication mode is switched to the normal communication mode,
After registering the index number or the encryption key, the data to be transmitted can be quickly transmitted without performing the encryption transmission process.

When the index number corresponding to the other party of the encrypted communication and the encryption key corresponding to the index number are registered or not during the encrypted communication, and either the index number or the encrypted key is not registered, Switch the mode from communication mode to registration mode and enable registration of unregistered index numbers in the communication destination table or registration of unregistered encryption keys in the encryption key table. The key can be registered quickly, and the interrupted encrypted communication process can be continued with a simple operation, which improves the operability of encrypted communication.

[Brief description of drawings]

FIG. 1 is a block configuration diagram of a facsimile apparatus (encryption communication apparatus) according to the present invention.

FIG. 2 is a diagram showing an example of an operation unit and a display unit provided on an operation panel of a facsimile device (encryption communication device) according to the present invention.

FIG. 3 is a circuit diagram of a connection check circuit for checking a connection state of a personal computer.

FIG. 4 is a time chart for explaining the operation of the connection check circuit.

FIG. 5 is a flowchart for performing connection abnormality check of the personal computer 12 when the communication mode is set.

FIG. 6 is a diagram showing a display example of a connection abnormality warning message.

FIG. 7 is a flowchart for checking a connection abnormality of a personal computer during communication mode setting.

FIG. 8 is a flowchart for periodically checking a connection abnormality of a personal computer during a communication mode setting period.

FIG. 9 is a flowchart showing a registration process in a communication partner registration mode.

FIG. 10 is a flowchart showing a registration process in an encryption key registration mode.

FIG. 11 is a flowchart showing a data transmission process in a facsimile mode.

FIG. 12 is a flowchart showing a data reception process in a facsimile mode.

[Explanation of symbols]

1 Facsimile machine 2 Scanner section 3 Printer section 4 Data processing unit 401 memory 402 compression / expansion circuit 403 Encryption / flat culture circuit 404 Data processing circuit 5 Data transmission section 501 modem 502 NCU 6 control unit 601 data buffer 602 ROM 603 RAM 7 RS-232C interface 8 Command switch 9 Operation part 10 Display 11 speakers 12 personal computer 13 telephone lines 14 Facsimile (FAX) 15 Operation panel 16 One-touch key 17 indicator light 18 Display board 19 speaker window 20 Select key 21 Numeric keypad 22 Function key 23 Start / Stop key 25 RS receiver 26 gate circuits 27 D-FF 28 CPU

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) H04L 9/14 H04N 1/44

Claims (4)

(57) [Claims] 1. An encryption key storage means rewritably storing an encryption key table in which a plurality of encryption keys are registered corresponding to index numbers; a communication number of a communication partner corresponding to an operation number and the encryption key. The communication destination table in which the index number is registered is rewritably stored, and the communication destination table corresponds to the index number stored in the communication destination storage means with the communication partner corresponding to the operation number. An encryption communication device for encrypting information by an encryption key to perform encryption communication, wherein an encryption key registration mode for registering an encryption key in the encryption key table, a communication number in the communication destination table, and an index of the encryption key Registration mode setting means for switching and setting a communication partner registration mode for registering a number, index number input means for inputting the index number, and the encryption code Encryption key input means for inputting a key,
When the operation number input means for inputting the operation number and the encryption key registration mode are set, the encryption key input by the encryption key input means is associated with the index number input by the index number input means. When the communication partner registration mode is set, the index number input by the index number input means is associated with the operation number input by the operation number input means. An encryption communication device, comprising: registration control means for registering in a destination table. 2. The cryptographic communication device according to claim 1, wherein
A registration discriminating means for discriminating the presence or absence of registration of an index number and an encryption key corresponding to a communication partner during the encrypted communication; and an index number or an index number when the registration discriminating means judges that the index number or the encryption key is not registered. An encryption communication device, comprising: a warning unit for issuing a warning that an encryption key has not been registered. 3. The encryption communication device according to claim 2,
The communication mode switching means for switching and setting the encrypted communication mode for transmitting and receiving the encrypted information and the normal communication mode for transmitting and receiving the information without encryption, and the index number or the encryption key are registered by the registration determining means at the time of the encrypted transmission. A cryptographic communication device comprising: a communication mode switching control unit that sets the communication mode to the normal communication mode when it is determined that the communication mode is not present. 4. A cryptographic communication device according to claim 1 or 2, and mode switching means for switching and setting a registration mode for registering the communication mode and the communication destination table or the encryption key table for communicating said information When the registration determining means determines that the index number or the encryption key is not registered, the mode is set to the registration mode, and when the index number and the encryption key are registered, the registration mode is switched to the communication mode. A cryptographic communication device, comprising: