JP2000341538A - Communication terminal equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily recover original image data and to enable confidential reception of image data even without an image memory by enciphering received image data on the basis of received signals, printing and recording the enciphered image data. SOLUTION: Facsimile equipment has facsimile communication functions of an ordinary G3 system or the like, the image data of an original are read by a reading part 2 and transmitted to the desired transmission destination, and image data are received from the transmission source and printed out by a recording part 3. Additionally, when confidential image data are received form the transmission source together with a prescribed sub-address number, the received image data are enciphered by a cryptographic key (scramble order) corresponding to the sub-address number and the enciphered confidential image data are printed out by the recording part 3. Furthermore, recording paper recording the enciphered confidential image data is read by the reading part 2, the read enciphered data are deciphered by corresponding cryptographic key (scramble order) and the source confidential image data are printed out by the recording part 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication terminal such as a facsimile machine, and more particularly to a communication terminal capable of receiving confidential image data from an external transmitter.

[0002]

2. Description of the Related Art Confidential transmission / reception of image data in which only a specific destination of a transmission destination designated by a transmission source can view image data transmitted from the transmission source without being seen by a third party is performed. . In this confidential transmission / reception system, when F-code confidential transmission is performed from the transmission source facsimile apparatus, the transmission destination facsimile apparatus stores the transmitted image data in the image memory. Then, the specific recipient of the transmission destination inputs a password to the transmission destination facsimile machine,
Print out the image data stored in the image memory.

[0003]

The confidential transmission / reception function of image data in which confidential image data is disclosed only to a specific destination without being seen by a third party is extremely convenient. Conventionally, the facsimile device at the transmission destination requires an image memory for storing the image data to be transmitted, and a facsimile device without an image memory has a confidential transmission / reception of this image data. There is a problem that the function cannot be performed.

[0004] The present invention has been made in view of such circumstances, and has as its object to provide a communication terminal device that can perform a confidential reception function of image data without having an image memory. .

[0005]

According to a first aspect of the present invention, there is provided a communication terminal device comprising: a receiving unit for receiving image data transmitted from an external transmitter and a signal for specifying a destination of the image data;
An encryption unit that encrypts the image data received by the reception unit based on the signal received by the reception unit; and a recording unit that prints and records the image data encrypted by the encryption unit. Features.

In the communication terminal device of the present invention (claim 1), confidential image data received from an external transmitter is encrypted, and the encrypted image data is printed and recorded. Therefore, confidential image data transmitted to a specific destination is not read by a third party, and confidential image data can be received without an image memory.

[0007] According to a second aspect of the present invention, there is provided a communication terminal apparatus.
In, the signal transmitted from the transmitter is present in a plurality of types according to the destination, storage means storing a plurality of encryption keys respectively corresponding to each type of signal,
Means for reading an encryption key corresponding to the type of the received signal from the storage means, wherein the encryption means encrypts the received image data using the read encryption key. It is characterized by comprising.

In the communication terminal device according to the present invention (claim 2), a plurality of data for encrypting received image data addressed to each transmission destination corresponding to the type of signal transmitted from the transmitter are provided. Stores the encryption key. Therefore, a plurality of encryption keys can be registered, and confidential reception of image data to a plurality of transmission destinations (specific partners) is possible.

[0009] According to a third aspect of the present invention, there is provided a communication terminal apparatus.
Or in 2, wherein the reading means for reading the encrypted image data printed and recorded by the recording means, and a decoding means for decoding the result of reading by the reading means to the original image data transmitted from the transmitter, The recording means is configured to print and record the image data decoded by the decoding means.

[0010] In the communication terminal device of the present invention (claim 3), the recording paper on which the encrypted confidential image data is printed is read, and the read result is converted to the original image using the encryption key. The data is decrypted, and the decrypted original confidential image data is printed and recorded. Therefore, the confidential image data can be easily restored to the original confidential image data, and confidential reception of image data can be realized without an image memory.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the drawings showing the embodiments. FIG. 1 is a block diagram showing a configuration of a facsimile apparatus which is an example of a communication terminal apparatus according to the present invention. In FIG. 1, the main control unit 1
More specifically, it is constituted by a CPU, and is connected to each of the hardware units described below via a bus 20 to control them and execute various software functions.

The reading section 2 reads a document by a scanner using, for example, a CCD and outputs image data of a black and white binary document. The recording unit 3 is a printer device of an electrophotographic system or the like, and encrypts image data received from another facsimile device by normal facsimile communication that is not confidential, and image data received from another facsimile device by confidential facsimile communication. The encrypted image data, the image data obtained by decrypting the encrypted image data, and the like are printed out as a hard copy and recorded.

The display unit 4 is a display device such as a liquid crystal display device or a CRT display, and displays an operation state of the facsimile machine, and displays image data of a document to be transmitted or received image data. The operation unit 5 includes character keys, numeric keys, speed dial keys, one-touch dial keys, various function keys, and the like necessary for operating the facsimile machine. When the display unit 4 is a touch panel type, some or all of the various keys of the operation unit 5 can be substituted.

The ROM 6 stores various software programs necessary for the operation of the facsimile machine in advance. The RAM 7 is configured by an SRAM, a flash memory, or the like, and stores temporary data generated when executing software.

The encryption key memory 8 includes a sub address number included in the sub address signal to specify a transmission destination,
A subaddress / encryption key table indicating correspondence with an encryption key for encrypting confidential image data is stored.
FIG. 2 is a diagram showing the contents of the sub-address / encryption key table, in which sub-address numbers and numbers indicating encryption keys are registered in association with each other. Encryption in the facsimile apparatus of the present invention is performed in the column direction of image data (for example, 1 m
m), and a plurality of encryption keys specified by respective numbers indicate the order of the scramble. As shown in FIG. 2, one type of encryption key (scramble order) is assigned to each sub address number. The facsimile apparatus of the present invention is not provided with an image memory for storing image data.

The modem 9 is a modem having a function for performing facsimile communication of image data of a document read by the reading unit 2 and image data from another facsimile apparatus. The modem 9 is an NCU 1 for closing and opening the analog line L.
Connected to 0.

The facsimile apparatus of the present invention has a facsimile communication function of a normal G3 system or the like with the above-described hardware configuration. And the image data is received from the transmission source and printed out by the recording unit 3. Further, when the confidential image data is received from the transmission source together with a predetermined sub-address number, the facsimile apparatus of the present invention encrypts the received image data with an encryption key (scramble order) corresponding to the sub-address number. The encrypted confidential image data is printed out by the recording unit 3, and the recording paper on which the encrypted confidential image data is recorded is read by the reading unit 2, and the read encrypted data is corresponded. Encryption key (scramble order)
And the original confidential image data can be printed out by the recording unit 3.

Next, the operation will be described. FIG. 3 is a flowchart showing an operation procedure of image data reception processing in the facsimile apparatus of the present invention. It is determined whether or not a facsimile reception operation is requested from the partner machine (step S1). If the facsimile reception operation is requested (S1: YES), it is determined whether the transmission from the partner machine is F-code confidential transmission. (Step S2). If the transmission is not F-code confidential transmission (S2: NO), a normal reception operation is performed without performing encryption processing, and the received image data is printed out by the recording unit 3 (step S7).

In the case of F-code confidential transmission (S2:
YES), the sub-address number included in the sub-address signal sent from the partner device is detected (step S3). The sub address / encryption key table in the encryption key memory 8 is referred to, and it is determined whether or not the detected sub address number is registered (step S4). If not registered (S4: NO), confidential reception is performed from an unregistered transmission source, so communication is terminated and the line is disconnected (step S8).

On the other hand, if the detected sub-address number is registered (S4: YES), the sub-address number is recorded on the recording paper by the recording section 3 (step S5), and the encryption corresponding to the sub-address number is performed. The received image data is encrypted using the encryption key (scramble order), and the encrypted image data is printed out on the recording paper on which the sub-address number is recorded by the recording unit 3 (step S6). As described above, in the case of confidential reception, the encrypted image data is printed out, so that its confidentiality is maintained.

FIG. 4 is a flowchart showing an operation procedure of a process of decoding and printing original image data in the facsimile apparatus of the present invention. The recording paper on which the confidential encrypted image data is recorded is set in the reading unit 2 (step S
11). The input of the sub-address number and the number of the encryption key is received by the operation unit 5 from the user as the transmission partner (step S12). It is determined whether or not the input sub-address number and the encryption key number have been registered with reference to the sub-address / encryption key table, and the input sub-address number is set to the sub-address number printed on the recording paper. It is determined whether they match (step S13).

If both numbers are registered and the sub-address numbers match (S13: YES), the encrypted image data on the recording paper is read by the reading unit 2, and the read encrypted image data is encrypted. Decryption with the key (step S1
4) Print out the decrypted original confidential image data in the recording unit 3 (step S15). If at least one of the conditions is not satisfied in S13 (S13:
NO), the operation is terminated without performing such decoding processing.

As described above, according to the present invention, confidential reception of image data can be performed even in a facsimile apparatus not provided with an image memory for storing image data.

In the above example, a case has been described where confidential reception of image data is performed by a facsimile apparatus not provided with an image memory. However, in a facsimile apparatus provided with an image memory, the storage area of the image memory is image data. When full, the technique of the present invention can be applied.

[0025]

As described above, the communication terminal device of the present invention encrypts confidential image data received from the transmission source device and prints and records the encrypted image data. Also, confidential image data is not read by a third party, and confidential reception of image data can be performed without an image memory.

In another communication terminal device of the present invention, a plurality of encryption keys corresponding to the types of subaddress numbers sent from the transmission source device are stored, so that a plurality of encryption keys can be registered. Confidential reception of image data to each of a plurality of transmission destinations can be performed.

In still another communication terminal device according to the present invention, a recording sheet on which confidential encrypted image data is printed is read, and the read result is decrypted with the encryption key into the original confidential image data. Since the original confidential image data is printed and recorded, the original confidential image data can be easily returned to the original confidential image data, and confidential reception of image data can be realized without an image memory.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a facsimile apparatus of the present invention.

FIG. 2 is a diagram showing the contents of a subaddress / encryption key table.

FIG. 3 is a flowchart showing an operation procedure of image data reception processing in the facsimile apparatus of the present invention.

FIG. 4 is a flowchart showing an operation procedure of a decoding / printing process on original image data in the facsimile apparatus of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main control part 2 Reading part 3 Recording part 5 Operation part 6 ROM 7 RAM 8 Encryption key memory 9 Modem 10 NCU

Claims (3)

[Claims] A receiving means for receiving image data transmitted from an external transmitter and a signal specifying a destination of the image data; and receiving the image data received by the receiving means. A communication terminal device comprising: an encrypting unit that encrypts based on a signal; and a recording unit that prints and records image data encrypted by the encrypting unit. 2. A storage means for storing a plurality of types of signals transmitted from the transmitter in accordance with a transmission destination, and storing a plurality of encryption keys respectively corresponding to the respective types of signals. A means for reading an encryption key corresponding to the type of the received signal from the storage means, wherein the encryption means comprises:
2. The communication terminal device according to claim 1, wherein the received image data is encrypted by using the read encryption key. 3. A reading device for reading encrypted image data printed and recorded by the recording device, and a decoding device for decoding a result of reading by the reading device into original image data transmitted from the transmitter. 3. The communication terminal device according to claim 1, wherein said recording means prints and records the image data decoded by said decoding means.