JPS6286969A - Encipherring transmittable receivable facsimile equipment - Google Patents

Abstract

PURPOSE:To execute the enciphering transmission and reception of picture information by designating the virtual referring line except for the blank necessary for decoding from the transmission side to the reception side, coding the picture information with MMR based upon the designated virtual referring line at the transmission side and executing the decoding based upon the received virtual referring line at the reception side. CONSTITUTION:In the terminal to encipher and transmit the picture information, the information except for the blank is written in LM 2 from a referring line generating part 7 before the beginning of the reading of the picture information. From the transmission side terminal from the receiving side terminal, the parameter to show which referring line is used is sent. In such a way, after the special referring line is specified, the transmitting terminal starts the reading, the data from a reading part 1 are written successively into LM 2, MMR coding is executed by CODEC 3 and the data are sent through a CCU 4 to the line. At the receiving side terminal, the data coded in such a way are received, the CODEC 3 executes the decoding based upon the special referring line written earlier in the LM 2 and the correctly decoded picture information can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a facsimile machine capable of encrypting and transmitting image information.

■Prior Art Since the MMR encoding of the G4 facsimile itself is new, something like this has never been seen before.

■Purpose When sending a document to a destination terminal using a facsimile device, it is necessary to encrypt the image information in order to keep the document confidential or so that the image information can only be decrypted at a specific terminal.

It is desirable that the encryption mechanism be simple and that does not significantly reduce the transmission efficiency of image information, and the present invention aims to realize this by using the G4 facsimile procedure and encoding system.

■Configuration FIG. 1 is a diagram for explaining the configuration of an embodiment of the present invention, where 1 is a reading section, 2 is an LM (line memory), and 3 is a C
0DEC (encoding/decoding device), 4 a CCU (communication control unit), 5 a recording section, 6 a 5CU (system control unit), 7 a reference line generation section, and 8 a line.

In a terminal to which image information is to be encrypted and transmitted, information other than full white is written into LM2 from a reference line generation section 7 before starting to read the image information.

That is, this image information becomes a virtual reference line when performing MMR encoding.

In addition, a parameter indicating what kind of reference line is used is sent from the transmitting terminal to the receiving terminal.

The receiving terminal refers to the received parameters, learns the reference line used by the transmitting side for MMR encoding from the same reference line generation unit 7 as the transmitting terminal, and transmits the image information to the L of the receiving terminal.
Write to M2. This becomes a reference line when performing MMR decoding.

The reference line generation unit 7 may have, for example, a ROM having the same pattern as a table for each reference line so that the same reference line can be obtained with the same parameters only between terminals that want to encrypt and transmit/receive image information. is possible.

In this way, after a specific reference line is determined, the transmitting terminal starts reading and sequentially transfers the data from the reading section 1 to the LM2.
The data is written to , MMR encoded by CODEC3, and sent to the line via CCU4.

The receiving terminal receives the encoded data in this way, and the C0DEC3 decodes it based on the specific reference line previously written to the LM2 to obtain correctly decoded image information. can.

Here, if the receiving terminal is not a legitimate one, the terminal always performs decoding based on a virtual line (usually a white line) that is different from the specific reference line, making it impossible to reproduce correct image information.

FIG. 2 shows a flowchart on the receiving side in the present invention.

A similar pattern is drawn in advance in the ROM to serve as a reference line for both the transmitting side and the receiving side.

On the transmitting side, information about which line pattern is to be used as a reference line is passed as a parameter to the receiving side during the protocol.

On the transmitting side, using the line pattern as the first reference line, image information is encoded and sent to the receiving side.

The receiving side determines the parameters and starts decoding using a designated similar pattern in the ROM as a reference line for the first line.

When data encoded using the above method is decoded by a normal receiver, it cannot be reproduced as regular image information, and confidentiality can be maintained.

(2) Effects As explained above, the present invention enables encrypted transmission and reception of image information without significantly changing the configuration of a conventional facsimile machine.

[Brief explanation of drawings]

FIG. 1 is a diagram for explaining the configuration of an embodiment of the present invention,
FIG. 2 shows a flowchart on the receiving side in the present invention. 1...Reading section, 2-LM, 3. CODEC
. 4...CCU, 5...Recording section, 6...S
CU, 7...Reference line generation unit, 8...Line. Patent applicant Ricoh Co., Ltd. Figure 1 Figure 2

Claims (1)

[Scope of Claims] An LM that stores image information from a reading unit or image information composited from encoded data for a plurality of lines in units of one line, and a CODEC that encodes and decodes image information; A facsimile machine that has a CCU that sends or receives image information and various parameters over a line, a recording section that prints decoded image information on recording paper, and a means for generating an appropriate reference line other than completely white. , When you want to encrypt a document and send/receive it, before sending or receiving encoded image information, the sending side specifies a virtual reference line other than all white necessary for decoding to the receiving side, and then the sending side specifies the A facsimile device capable of encrypted transmission and reception, characterized in that image information is encoded by MMR based on the virtual reference line that has been received, and decoding is performed on a receiving side based on the received virtual reference line.