JP2530161B2 - Communication system equipment - Google Patents

Description

TECHNICAL FIELD The present invention relates to a communication system device.

[Related Art] In recent years, car phones have become widespread, and facsimile communication using car phones has been performed. In this case, image information is transmitted by radio waves between the car phone and the wireless station. Also, for details of various signals transmitted between ordinary facsimile machines that comply with CCITT recommendations,
It is generally known.

Therefore, if a third party creates a receiver and a facsimile device that record the image information transmitted by receiving the radio wave, the transmitted image can be easily intercepted.

For this reason, the conventional facsimile apparatus has a problem that the confidentiality of communication is lacking because the information may be leaked to the outside in the transmission of a confidential document or the like.

[Object] It is an object of the present invention to solve the above problems and provide a communication system device with high confidentiality of communication.

[Configuration] Therefore, according to the present invention, in a communication system device for transmitting image information to a partner terminal via a wired line or a wireless line, an encryption unit for encrypting image information to be transmitted and a line used are wired lines. And a wireless line, the image information is encrypted and transmitted when the line used is a wireless line when transmitting the image information.

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

FIG. 1 shows a block diagram of a facsimile apparatus 1 according to one embodiment of the present invention. In the figure,
The reading unit 2 reads out an image of a transmission original to extract image information. The line buffer 3 stores the extracted 1
The image information for the line is temporarily stored.

The pre-encoding / decoding unit 4 is for encrypting and transmitting image information data, and includes an encoding unit 4a that encodes image information data to be transmitted by a specific method, and encoded image information data. Is composed of a decoding unit 4b for returning the data to the original data and a switching unit 4c for selecting whether or not to perform the coding / decoding of the data.

The encoding unit 4a and the decoding unit 4b are conventionally known as a data scrambler. For example, the encoding unit
4a encodes image information data by inverting "1" and "0" with random numbers or special operations, inserting random data, and changing the content depending on the date and time, while decoding. The conversion unit 4b restores the original data even if it is decrypted.

The line buffer 5 temporarily stores the received image information for one line, and the recording unit 6 records the image information on recording paper.

The encoding / decoding unit 7 encodes image information to be transmitted and decodes image information received in accordance with the G3 standard of CCITT recommendation in order to compress the image information to be transmitted.

The buffer 8 temporarily stores the transmitted image information or the received image information. The modem 9 modulates or demodulates image information and various information in transmission control and transmits the information.

The communication procedure control unit 10 executes a predetermined transmission control procedure, and in the present embodiment, the transmission side has a polling function for receiving image information. An NCU (network control device) 11 performs a call receiving operation by detecting an incoming call and an incoming call such as capturing a line and transmitting a selection signal as a dial number.

The operation display unit 12 displays operation guidance, inputs a destination telephone number, and instructs start of the apparatus. The telephone number discriminating unit 13 discriminates from the inputted telephone number whether the destination is a wired line or a wireless line.

The system control unit 14 controls each of the above units and executes predetermined image transmission.

FIG. 2 shows the system configuration of the facsimile system of this embodiment. In the figure, the above-mentioned facsimile device 1 is connected to a wired line of a telephone station 15.

The central office 15 is connected to another central office 17 via a public telephone network 16.
The facsimile device 18 is connected to the wired line of the telephone station 17. This fax machine 18
Is a normal facsimile machine that complies with CCITT Recommendation G3 standard.

The telephone station 17 is connected to a radio station 19 of a car telephone. The facsimile device 20 has the same circuits as the encoding unit 4a and the decoding unit 4b shown in FIG. 1 and has a built-in circuit for transmitting encrypted image information. The facsimile device 20 is mounted in an automobile and connected to an automobile telephone.

In the above-described configuration, when transmitting a document by the facsimile apparatus 1, first, a transmission document is set on the reading unit 2, a destination telephone number is input on the operation display unit 12, and then a start operation is performed.

As a result, under the control of the system control unit 14, each unit is activated, and a predetermined calling process is performed according to the input destination telephone number.

By the way, when the destination is an ordinary wired line, the telephone number is composed of area code-local code-subscriber number, for example, 03-555-5555, while the destination is an automobile. In the case of telephone, for example, 040-31-55555 has a configuration of a number indicating a 3-digit car telephone, a 2-digit area number, and a 5-digit subscriber number.

The telephone number discriminating unit 13 discriminates the leading three digits of the input destination telephone number and determines whether the destination is a wired line or a wireless line. For example, if an outgoing call is made to the facsimile device 18, it is determined that the outgoing line is a wired line based on the destination telephone number.

In this case, in the precoding / decoding unit 4, the switching unit 4c switches the coding unit 4a and the decoding unit 4b so that they do not operate. When the facsimile device 18 receives an incoming call, a predetermined transmission control procedure is executed between the facsimile devices 1 and 18, and the image information read by the reading unit 2 is stored in the line buffer 3 and the pre-coding / decoding unit 4. Through the encoding / decoding unit 7
Is input to At this time, the pre-encoding / decoding unit 4 does not encode the image information, the encoding / decoding unit 7 performs a predetermined encoding for data compression, and the encoded image information is stored in the buffer 8 Is transmitted to the modem 9 via the, and is modulated by the modem 9 and transmitted from the NCU 11.

The facsimile device 18 receives the image information and prints the received image on a recording sheet. As described above, when the transmission destination is a normal facsimile apparatus, the same transmission processing as in the conventional case is executed.

On the other hand, if the next call is made to the facsimile device 20, the telephone number determination unit 13 determines from the destination telephone number that the destination is a car telephone.

In this case, the switching unit 4c is switched so that the encoding unit 4a and the decoding unit 4b operate. And a facsimile machine
When 20 is received, a predetermined transmission control procedure is executed between the facsimile devices 1 and 20, and the image information read by the reading unit 2 is transmitted via the line buffer 3 to the precoding / decoding unit 4
Is input to At this time, in the pre-encoding / decoding unit 4, the input image information is encoded by the encoding unit 4a for encryption.

The encoded image information is further processed by the encoding / decoding unit 7
A predetermined encoding for data compression is performed at, and the encoded image information is transmitted via the buffer 8 to the modem 9
Is transmitted to the NCU 11 after being modulated by the modem 9.

In the facsimile device 20, this image information is received, decoding is performed corresponding to the coding in the coding section 4a,
The image is recorded and output on recording paper.

Next, when the facsimile device 1 performs the polling reception, after the polling is designated, the facsimile device 1 performs the transmission operation in the same manner as described above.

In this case, in the transmission control procedure, a transmission command is sent to the other party so that the image information is transmitted from the other party.
Further, the image information is encrypted and transmitted from the facsimile device of the car telephone.

At this time, the destination is determined from the destination telephone number in the same manner as above, and when the other party is a car telephone facsimile machine, the decoding unit 4b is operated to restore the received image information to the original image information. It is recorded by the recording unit 6.

As described above, according to the present embodiment, the facsimile apparatus 1
Image data is encrypted and transmitted / received to / from a facsimile device 20 connected to a car telephone.

In the case of image transmission using a car phone, since the image information is transmitted between the car phone and the wireless station by radio waves, a third party can easily intercept the radio waves.
However, since the image information is encrypted and transmitted as described above, even if the radio wave is intercepted, the facsimile device that records the image is provided with the decoding unit of the same method as the encoding unit 4a. If it is not installed, the transmitted image cannot be taken out.

Therefore, it becomes very difficult to intercept the received image, and the confidentiality of the communication becomes high. As a result, it becomes possible to safely transmit confidential documents and the like.

In addition, the destination telephone number is used to determine whether the destination is a normal facsimile device or a car telephone facsimile device, and the encoding unit 4a and the decoding unit 4b are activated only in the latter case. Therefore, the operator of the facsimile apparatus 1 does not need to determine the destination as described above, and can easily operate it.

In addition, in the above-mentioned embodiment, the pre-coding / decoding unit 4 is
It is arranged between the line buffers 3 and 5 and the encoding / decoding unit 7 so that the encoded image information data is compressed by the encoding / decoding unit 7. It may be arranged between the buffer 8 and the buffer 8. At this time, if the encoding unit 4a is of a type that inserts data, the amount of data is not compressed after encryption, so that the communication time becomes long.

Also, although the case where the facsimile machine 1 receives a call was not explained, the NSF signal and N
Switching section 4c of precoding / decoding section 4 using SS signal or the like
Can be switched as needed.

Further, it goes without saying that the present invention is not limited to the G3 standard facsimile machine but can be widely applied to G4 standard and other general facsimile machines. Furthermore, the present invention is naturally applicable not only to car phones but also to ship phones and the like.

[Effect] As described above, according to the present invention, in a communication system device for transmitting image information to a partner terminal via a wired line or a wireless line, an encryption unit for encrypting image information to be transmitted, and use thereof. It has a discriminating unit that discriminates whether the line to be used is a wired line or a wireless line. When transmitting image information, if the line used is a wireless line, the image information is encrypted and transmitted. The interception of the received image by a third party becomes difficult, and the confidentiality of communication increases.

[Brief description of drawings]

FIG. 1 is a block configuration diagram of a facsimile apparatus according to an embodiment of the present invention, and FIG. 2 is a block configuration diagram of a facsimile system using the facsimile apparatus. 1,18,20 ... Facsimile machine, 2 ... Reading unit, 3,5 ...
Line buffer, 4 ... Precoding / decoding section, 4a ... Encoding section, 4b ... Decoding section, 4c ... Switching section, 6 ... Recording section, 7 ... Encoding / decoding section, 8 ...... Buffer, 9 ...... Modem, 10 ...... Communication procedure control unit, 11 ...... NCU, 12 ...... Operation display unit, 13 ...... Telephone number discrimination unit, 14 ...... System control unit, 15,17 ...... Telephone Station, 16 …… Public telephone network, 19 ……
Radio station.

Claims (1)

(57) [Claims] 1. A communication system device for transmitting image information to a partner terminal via a wired circuit or a wireless circuit, and an encryption unit for encrypting image information to be transmitted, and whether the line used is a wired line or wireless. A communication system device, comprising: a discriminating unit for discriminating whether or not the line is a line, and transmitting the image information by encrypting the image information when the line used is a wireless line.