KR0120576B1 - Data transmission method for protection of fax image information and identification of identity in fax communication - Google Patents

Abstract

In a data transmitting method of a facsimile machine, which has a central processing unit (30) generally controlling a system; a scanning unit (10) scanning document to be transmitted in a scanning method of the facsimile machine through a sensor; a MODEM (60) modulating and demodulating data signals recognized through the scanning unit (10) for transmitting them through a public telephone network or facsimile dedicated network; a line matching unit (70) for matching the MODEM (60) and the public telephone network or facsimile machine dedicated network; a ROM (40) storing program for controlling a driving of the central processing unit (30) and facsimile machine and protocol program for the facsimile communication; a RAM (50) storing data required in the communication of the facsimile machine and data required in a control thereof; and an output unit (20) received image information of the facsimile machine to printing paper, the data transmitting method includes the steps of: producing authentication data by a receiving party's facsimile machine to form it as an NSF frame according to an approval of a call connection signal from a transmitting party's facsimile machine, and then, transmitting the NSF frame to the transmitting party's facsimile machine; extracting authentication data from the receiving party's facsimile machine by the transmitting party's facsimile machine to drive an authentication algorithm, if the NSF frame is transmitted from the receiving party's facsimile machine; producing important data for protecting authentication data of the transmitting party's facsimile machine and image information to be transmitted by the transmitting party's facsimile machine, if the receiving party's identity is identified as a result of driving the authentication algorithm in said extracting step, and forming it as an NSS frame to transmit it to the receiving party's facsimile machine, and cutting off a line, if the receiving party's identity is not identified as a result of driving the authentication algorithm in said extracting step; and extracting important data for protecting authentication data and image information of the facsimile machine by the receiving party's facsimile machine, if the NSS frame is transmitted from the transmitting party's facsimile machine in the above step, and driving authentication algorithm; and recovering image information of the facsimile machine through important data for protecting image information of the facsimile machine extracted from the NSS frame, if the transmitting party's identity is identified as a result of driving the authentication algorithm in the above extracting step, and cutting off a line, if the identity of the transmitting party's facsimile machine is unidentified in said extracting step, by the receiving party's facsimile machine.

Description

Data transmission method for identification and protection of fax image information in fax communication

1 is a block diagram of a general fax machine.

2 is a control flowchart of a sending side fax according to the present invention.

3 is a control flowchart of a receiving side fax according to the present invention.

4 is a configuration diagram of a high level data link control (HDLC) frame.

* Explanation of symbols for main parts of the drawings

10: scanning unit 20: output unit

30: central processing unit 40: ROM

50: RAM 60: Modem

70: line matching unit

The present invention relates to an authentication data transmission method for confirming the identity of a transmission and reception fax and a data transmission method for protecting image information transmitted between transmission and reception faxes.

In the conventional fax, the identity between the transmitted and received faxes is verified by using a CSI (Called Subscriber Identification) frame and a TSI (Transmitting Subscriber Indentification) frame. With CSI frame. The information content of the TSI frame consists of telephone codes (0-9, *, #, +) used internationally.

Incoming and outgoing faxes register their identification number using the telephone code before communication.When communication starts, the receiving fax sends the registered identification number to the sending fax using the CSI frame, and the sending fax uses the TSI. Using the frame, the registered identification number was transmitted to the receiving side fax to verify the identity between the sending and receiving faxes.

However, the above method only determines the other party's identification number, and because the identity of the fax is not authenticated, even if the third party uses a CSI frame or TSI frame that is different from the CSI frame or TSI frame, Or can be received.

In other words, the transmission and reception faxes can communicate with each other regardless of the contents of the CSI frame or the TSI frame.

Therefore, since the identity authentication of the transmission and reception fax is not performed between the faxes transmitted and received using the CSI frame and the TSI frame, a dispute about image information transmission may occur between the transmission and reception faxes.

For example, a sending fax can deny that the receiving fax has sent the fax information, but the receiving fax has not received the fax, and the receiving fax can deny that the receiving fax has received the fax. It could be argued that the sending fax did not send the fax information even though it did not send the fax information, or that the receiving fax received it even though it did not receive the fax information.

Therefore, the above-described problems exist in the prior art, and there is a problem in that a lot of arbitration manpower, time and cost are required to solve the case of a dispute caused by the above problems.

Accordingly, the present invention has been made to solve the above problems, to transmit the authentication data for the identification of the fax using a non-standard function of the fax protocol, and to protect the fax image information transmitted by the transmission path between the fax transmission and reception Its purpose is to provide a means of delivering the necessary critical data.

In order to achieve the above object, the present invention provides a non-standard facility (NSF) in which a receiving side fax generates authentication data according to an authorization of a call connection signal from a sending side fax. A first step of constructing a frame and transmitting it to a sending side fax; and in this step, if the NSF frame is transmitted from the receiving side fax, the sending side fax extracts authentication data of the receiving side fax from the NSF frame to drive an authentication algorithm. In step 2 and when the identity of the receiving fax is authenticated as a result of the operation of the authentication algorithm in the above step, the sending fax generates important data to protect its authentication data and the transmitted fax image information (NSS-Standard Facilitiews). Set-up) frame and transmit it to the receiving side fax, and in this step the driving result of the authentication algorithm The third step of disconnecting the line if the identity of the mobile station is not authenticated, and if the NSS frame is transmitted from the sending fax machine in the above step, the receiving fax machine extracts the authentication data and important data for protecting the image information of the fax and performs the authentication algorithm. A fourth step of driving, and if the identity of the sending fax is authenticated in the step of the authentication algorithm, the receiving fax restores the fax image information through the important data for protecting the image information of the fax extracted from the NSS frame. In step 5, if the authentication result of the authentication algorithm is not authenticated on the identity of the sender's fax machine, the line is disconnected.

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

The present invention uses the authentication algorithm widely used in the field of computer communication to verify the identity of incoming and outgoing faxes, to verify the validity of incoming and outgoing faxes, to generate authentication data to solve all possible disputes between incoming and outgoing faxes. In addition, algorithms for generating important data, protecting information, and restoring information needed to protect fax image information transmitted between faxes are used.

However, in the case of using the identity authentication algorithm and information protection algorithm as described above, there is a problem that must deliver the authentication data for identity authentication and important data for information protection, the present invention to solve the above problems The non-standard function of the fax communication protocol was used.

FIG. 1 shows the configuration of a general fax machine. The central processing unit 30 controls the entire system and scans a document to be transmitted according to the control of the central processing unit 30 through a sensor according to a fax scanning method. A scanning unit 10, a modem unit 60 for demodulating and demodulating data signals recognized by the scanning unit 10 via a public telephone network or a fax dedicated network, and the modem unit 60 and a public telephone network or fax machine A line matching unit 70 for matching a dedicated network, a program for driving and controlling the fax of the central processing unit 30, a ROM 40 storing a protocol program for fax communication, and a fax communication necessary RAM 50 for storing data and data necessary for fax control, and an output unit 20 for outputting image information of the received fax to a recording sheet.

The operation of transmitting a fax having the above configuration is as follows.

When the original to be sent is placed on the document glass of the fax, the central processing unit 30 recognizes this, moves the original into the system, and scans the original to be transmitted through the scanning unit 10.

The fax information scanned through the scanning unit 10 as described above is encoded according to the fax coating method, modulated through the modem unit 60, and transmitted to the receiving side fax through the line matching unit 7.

On the other hand, the operation at the time of receiving the rotation connection signal is input to the modem unit 60 through the rotation matching unit 70, the central processing unit 30 recognizes this and transmits the rotation connection response signal to the modem unit 60 and the line connection It transmits to the sending side fax via the matching unit 70 and connects the rotation between the sending and receiving faxes.

When the line is connected, the central processing unit 30 demodulates the fax information input through the rotation matching unit 70 through the modem unit 60, decodes it according to a decoding method, and outputs it to the recording paper through the output unit 20. do.

In addition, the ROM 40 stores a control program for controlling a fax, a program for encoding / decoding fax information according to a coding / decoding method of a fax, and a fax protocol program for performing communication between faxes. It is implemented in the pre-message procedure, which is the second stage of the fax protocol.

2 is a control flowchart of a transmitting-side fax illustrating a method of transmitting authentication data for identity authentication of a transmission / reception fax and important data for protecting fax image information transmitted between transmission / reception faxes according to the present invention.

In order to transmit the fax image information between faxes, the telephone line from the sending fax machine to the receiving fax machine is first detected to detect a telephone line connection response signal of the receiving fax machine (201). (Non-Standard Facilities) frame, the authentication data for identity authentication of the receiving fax in the information field of the NSF frame is extracted (202) and an authentication algorithm is run to authenticate the receiving fax (203).

As a result of the authentication algorithm being activated, when the new fax of the receiving fax is authenticated (204), authentication data for authenticating the identity of the sending fax is generated using the authentication algorithm, and important data for protecting the fax image information transmitted between the sending and receiving faxes. Is generated using the information protection algorithm (205) and configured as a non-standard facilities set-up (NSS) frame of non-standard functions among the protocols of the fax (206) and transmitted to the receiving side fax (207). While executing the FAX protocol, the information protection algorithm is driven to protect the FAX image information with important data generated for protecting FAX image information, and is transmitted to the receiving side FAX (208).

On the other hand, if the receiving fax is not authenticated by the authentication data transmitted from the receiving fax (204) and transmits the rotary disconnection signal to the receiving fax (209) to disconnect the line (210).

3 is a control flowchart of a receiving side fax showing a method of transmitting authentication data for identity authentication of a transmitting and receiving fax itself and important data for protecting image information of a fax transmitted between the transmitting and receiving faxes according to the present invention.

When the receiving side fax receives a signal for call connection from the sending side fax, it transmits a line connection response signal to the sending side fax (301). The authentication algorithm generates authentication data to verify the identity of the receiving side fax itself (302). The generated data is composed of NSF frames, which are non-standard functions of the fax protocol, and is transmitted to the sending side fax (303).

After transmitting the NSC frame to the sending fax as described above, the receiving fax receives the NSS frame, which is a non-standard function of the fax protocol transmitted from the sending fax (304). The server extracts important data for information protection (305) and runs an authentication algorithm to authenticate the sender's fax, thereby performing authentication to verify the identity of the sender's fax (306).

if. If the identity of the sending fax is not authenticated (307), a signal for rotational disconnection is transmitted to the sending fax (309) and the line is disconnected (310).

Meanwhile. If the identity of the sender's fax is authenticated (307), it performs the fax protocol and if the image information of the fax is received, it operates the information protection algorithm to protect the sender's fax through the important data extracted from the NSS frame to restore the fax image information. The fax image information is restored (308).

4 is a schematic diagram of a high level data link control (HDLC) frame for transmitting a 300bps low speed signal in a fax protocol. 8-bit start flag field, address field indicating the address of the 8-bit sending / receiving fax, control field indicating whether the last frame transmitted before the response signal of the 8-bit counterpart fax, and the type of 8-bit 300bps low-speed signal. The data calculated by CCITT's frame check sequence calculation method stores the fax control field, the fax information field for storing information to be transmitted and received between faxes, the address field for checking frame transmission errors, the control field, and the fax information field. It consists of a 2-byte frame check sequence field and an 8-bit final frame field.

In case that the sender's authentication data and important data are composed of NSS frame, the first 8 bits of the fax information field are the country codes defined in CCITT T.35, the next 3 bytes are the sender's authentication data of decimal value, and The next 8 bytes are used as important data of decimal values for protecting fax image information.

When the NSF frame is composed of the authentication data of the receiving party, the country code defined in CCITT T.35 of the first 8 bits of the FAX information field is used, and the receiving party authentication data of the decimal value is used for the next 3 bytes.

As described above, the present invention transmits authentication data for identification of a fax using non-standard functions among fax protocols, or transfers important data necessary for protecting fax image information transmitted through transmission path between transmission and reception faxes. Identity verification can be used to prevent disputes over the transmission of image information between faxes.

Claims (1)

A central processing unit 30 for controlling the entire system, a scanning unit 10 for scanning a document to be transmitted according to the control of the central processing unit 30 according to a fax scanning method through a sensor, and the scanning unit 10 A modem unit 60 for demodulating and demodulating data signals recognized through the public telephone network or a fax dedicated network, and a rotation matching unit 70 for matching the modem unit 60 with a public telephone network or a fax dedicated network. , A ROM for storing a program for driving and controlling the central processing unit 30 and a protocol program for facsimile communication, and a RAM for storing data for facsimile communication and data for facsimile control. A data transfer method of a fax machine having a 50 and an output section 20 for outputting image information of a received fax to a recording sheet, wherein the receiving side fax is printed upon application of a call connection signal from the sending side fax. And generates a data composed of NSF frame comprising: a first step of transmitting a fax transmission side; A second step of, when the NSF frame is transmitted from the receiving side fax in the step, the sending side fax extracts authentication data of the receiving side fax from the NSF frame to drive an authentication algorithm; In the above step, if the identity of the receiving fax is authenticated as a result of the operation of the authentication algorithm, the sending fax generates important data to protect its authentication data and transmitted fax image information, and configures it as an NSS frame and transmits it to the receiving fax. A third step of disconnecting the line if the identity of the receiving side fax is not authenticated in the step; A fourth step in which the receiving side fax extracts the authentication data and important data for protecting image information of the fax and runs the authentication algorithm when the NSS frame is transmitted from the sending side fax in this step; In this step, if the identity of the sending fax is verified, the receiving fax restores the fax image information through the important data for protecting the image information of the fax extracted from the NSS frame, and transmits the driving result of the authentication algorithm. And a fifth step of disconnecting the line if the identity of the side fax is not authenticated. 5. A data transmission method for identification and protection of fax image information in a fax communication.