JPH01246962A - Information transmitter with secret keeping function - Google Patents

Abstract

PURPOSE:To improve the security ot information transmission by providing a means which transmits character and picture information read at every scanning line after enciphering the information in accordance with a prescribed key and another means which outputs enciphered character and picture information after decoding the information in accordance with a prescribed key. CONSTITUTION:An enciphering means composed of enciphering circuits 21 and 22 transmits character and picture information read at every scanning line from a selector circuit 20 after enciphering the information in accordance with a prescribed random number of a key circuit 28. On the other hand, a decoding means composed of decoding circuits 24 and 25 outputs character and picture information enciphered by means of the enciphering means after decoding the information in accordance with a prescribed random number of the key circuit 28. When such enciphering and decoding means are provided, security of information transmission can be improved.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an information transmission device with a concealment function, and in particular, in a transmission system that is supposed to be image information, specific read information is transmitted in an encrypted manner and then decrypted and printed. The present invention relates to an information transmission device with a secret function that outputs information such as information, and can be used for information communication such as facsimile and personal computer communication.

[Background Art] With the progress of current information transmission technology, a wide range of information devices from industrial to consumer use are appearing.

Among such information communication devices such as facsimiles and personal computer communication, the number of information devices using wireless communication is increasing, and the number of mixed wired and wireless networks is also increasing.

[Problem to be Solved by the Invention 1] However, with the increase in the number of information communication devices using wireless media, or the increase in the number of wired and wireless networks, misdirection of information transmission, eavesdropping, numerical arithmetic, etc. Safety issues are attracting attention and are becoming a major issue in the information age.

However, most of these technologies are not made public because disclosing them would often impair the security of information transmission.

Therefore, the first object of the first invention is to maintain the conventional communication transmission function and increase the security of information transmission. Moreover, the second object of the second invention is to be able to use the conventional communication transmission function and to increase the security of information transmission by selection. The third object of the present invention is to maintain the conventional communication transmission function and increase the security of information transmission by selecting a key on the transmitting side and the receiving side. Furthermore, the fourth object of the present invention is to be able to use the conventional communication transmission function and to improve the security of information transmission by selecting a key on the transmitting side and the receiving side.

[Means for Solving the Problems] An information transmission device with a security function according to the first invention encrypts and transmits calligraphic information read for each scanning line using an encryption means that encrypts and transmits the encrypted information according to a predetermined key. The drawing information is decoded by a decoding means according to a predetermined key and output.

The information transmission device with a security function according to the second invention uses an encryption means that encrypts and transmits calligraphic information read for each scanning line according to a predetermined key, and transmits the encrypted output image information using a decryption means. The data is decrypted and output according to the key, and, if necessary, the encryption/decryption avoidance means avoids the processing of the encryption means and the decryption means.

The information transmission device with a secrecy function according to the third invention decrypts the encrypted and transmitted calligraphy information using an encryption means that encrypts and transmits the calligraphy information read for each scanning line according to a predetermined key. means to decrypt it according to a predetermined key and output it. At this time, the key information setting means transmits the key information selected by the encryption means from the transmitting side, and sets the key for the decryption means.

The information transmission device with a secrecy function according to the fourth aspect of the invention uses an encrypting means to encrypt and transmit calligraphic information read for each scanning line according to a predetermined key, and a decrypting means to encrypt the encrypted and transmitted calligraphic information. The data is decrypted and output according to the key, and the encryption/decryption avoidance means avoids the processing of the encryption means and the decryption means. The key information is set by the key information setting means, which transmits the key information selected by the encryption means from the transmitting side, and sets the key for the decryption means.

[Operation] In the first invention, the drawing information read for each scanning line is encrypted by the encryption means according to a predetermined key and transmitted. The encrypted transmitted image output information is decrypted by the decryption means according to a predetermined key, and the output means outputs the calligraphy information. Therefore, even if the calligraphic information is encrypted according to a predetermined key and then received during transmission due to a mistaken delivery, etc., the information will not be sent as accurate information to the mistaken destination, thereby ensuring the safety of information transmission. It is possible to increase the communication security and maintain the confidentiality of communications.

In the second invention, the drawing information read for each scanning line is encrypted by the encryption means according to a predetermined key and transmitted. The encrypted transmitted calligraphy information is decrypted by the decryption means according to a predetermined key, and the output means outputs the calligraphy information. Furthermore, the encryption/decryption avoidance means bypasses the processing of the encryption means and the decryption means, and directly outputs the normal calligraphy information for each scanning line. Furthermore, in this invention, normal reception can be performed by selecting the communication transmission function, and security of information transmission can be increased by selecting the encryption transmission function.

In the third invention, the drawing information read for each scanning line is encrypted by the encryption means according to a predetermined key and transmitted. The encrypted and transmitted calligraphy information is decrypted by the decryption means according to a predetermined key, and the output means outputs the calligraphy information. At this time, the key information selected by the encryption means is transmitted from the sending side by the key information setting means to set the key for the decryption means. Therefore, in particular, in the present invention, since the sending side can select a predetermined key for encryption, it is possible to select a key that matches the calligraphic information to be sent.

In the fourth invention, the drawing information read for each scanning line is encrypted by the encryption means according to a predetermined key and transmitted. The encrypted and transmitted calligraphy and drawing information is converted into 4ffM by the decryption means according to a predetermined key, and the calligraphy and drawing information is outputted by the output means. At this time, the key information setting means transmits the key information selected by the encryption means from the transmitting side, and sets the key for the decryption means. Furthermore, the encryption/decryption avoidance means bypasses the processing of the encryption means and the decryption means, and directly outputs the normal calligraphy information for each scanning line. However, in particular, according to the present invention, normal reception can be performed by selecting the communication transmission function, and security of information transmission can be increased by selecting the encryption transmission function. Furthermore, since the sending side can select a predetermined key for encryption, it is possible to select a key that matches the calligraphic information to be sent.

[Example 1 Examples of the present invention will now be described.

FIG. 2 is a circuit diagram of an embodiment in which the information transmission device with a security function of the present invention is used in a facsimile machine.

In FIG. 2, the line network control means 1 has various control units and control switches, and is a line switching control device that switches between a telephone line and a telephone or facsimile.
Further, in the case of a car phone, the telephone line is constituted by a known radio transmitter/receiver. Normally, the telephone and telephone line are connected, and the telephone and facsimile are connected by operating a switch. The modem means 2 is a modulator/demodulator that modulates and demodulates digital signals using carrier waves in a known audio frequency range, and is connected to a data bus, an address bus, and a control bus.

Note that the line network control means 1 and the modem means 2 are changed depending on the communication method or purpose, such as wired communication or wireless communication. Furthermore, the facsimile of this embodiment has the following components.

The operation switch and display means 3 is equipped with a switch for driving the facsimile machine and displays necessary for control, and the motor control and sensor means 4 are equipped with a pulse motor and a pulse motor that feed the thermal paper line by line. It consists of a paper sensor, etc. The I10 control means 5 connects the operation switch and display means 3 and the motor control and sensor means 4 to the electronic control means 6 via a data bus, an address bus, and a control bus.

The electronic control means 6 is a one-chip microcomputer MPU.
This is one control circuit for controlling a facsimile machine consisting of a program 1J, and a program for controlling the electronic control circuit MPU is stored in a built-in ROM. RAM
is a readable and writable memory used to control the electronic control circuit MPU.

The image information processing means 7 expands the bandwidth of the calligraphy information from the modem 2, outputs it as line information of a predetermined paper length to the line memory means 10 via the information transmission means 8 with a concealment function, and also conceals it from the line memory means 10. This is an encoding/decoding circuit that performs band compression on the document and image information outputted via the functional information transmission means 8 and outputs the compressed image information.

The information transmitting means 8 with a concealment function of this embodiment transmits image information to zero.
8, an encryption means and a decryption means for encrypting and decrypting, and a Meigetsu/decryption avoidance means for avoiding the encryption means and decryption means, and via the I10 control means 9,
Connected to the data bus, address bus, and control bus.

Further, the line memory means 10 includes the image information processing means 7.
The incoming calligraphy information is stored through the information transmitting means 8 with a secret function, and the stored information is outputted line by line as parallel information to the image storing means 12 side, and the reading scanning means 1
The storage information read on the third side is recorded in units of 11 lines.

The reading/writing control means 11 is a printing means or C
The line memory means 10 controls to write the image information of the line memory means 10 to the image storage means 12 side consisting of display means such as RT, and the stored information read by the reading scanning means 13 side consisting of reading means etc. Memory is controlled on a line-by-line basis.

It should be noted that the facsimile of the above embodiment from which the information transmission means 8 with a concealment function is removed becomes a normal facsimile.

Next, the information transmission means 8 with a secret function will be explained.

FIG. 1 is an information transmission circuit diagram with a security function showing the entire circuit configuration of an information transmission device with a security function in the form of a card according to an embodiment of the present invention.

In FIG. 1, the flow from the line memory means side to the image information processing means side shows the flow of signals when image information is transmitted, and the flow from the image information processing means side to the line memory means side shows the flow of the image information. This shows the signal flow when receiving.

As shown in FIG. 3, the selector circuit 20 is composed of three buffers (HC245), an I10 control means 9 for key control, a line memory means 10, and an encryption circuit [a] 21 This is used to switch between the two.

This switching is performed by a select signal and a key check signal.

The encryption circuit [a] 21, as shown in FIG. It outputs bit line-by-line calligraphy information by adding and subtracting the key output. Further, the encryption circuit [b] 22 is composed of two exclusive OR circuits (HC8B), as shown in FIG. The output is an exclusive OR with the key output.

The decoding circuit [b''] 24 is composed of two exclusive OR circuits (HC), as shown in FIG.
8B), which inputs the image information sent from the image information processing means 7 and outputs an exclusive OR with the key output. Further, the decoding circuit [a'] 25 is the seventh
As shown in the figure, it consists of two adder circuits (HC83), and performs an addition operation of exclusive OR calligraphy information from the decoding circuit [b''] 24 with the negated key output. That is, the subtraction operation is performed between the exclusive OR calligraphic information and the key output, and the result is output.

The selector & latch circuit 27 consists of two buffers (11C245) and a latch (8212), as shown in FIG. 8, and the encryption circuit [a] 2
1 or the output of the decoding circuit [b''] 24 is switched between buffers using a direction control signal, and the output is temporarily stored in a latch.

Further, the key circuit 28 is made up of a ROM that stores specific key information that produces an 8-bit output in response to an 8-bit input, as the specific circuit configuration is shown in FIG.

The decoder circuit 30 includes an encrypted signal CYS, a memory read signal M, as shown in FIG.
The presence or absence of an encrypted signal, a reception operation signal, a transmission operation signal, and a write/read signal are obtained from R, memory write signal MW, and memory address stroke signal MAS.

The power supply circuit 31 is constituted by a known constant voltage circuit, as the specific circuit configuration is shown in FIG.

The buffer circuit 23, buffer 1 circuit 26, and buffer circuit 29 are for switching purposes, and when only the buffer circuit 23 is closed, encrypted image information is passed from the line memory means side to the image information processing means side. Further, when only the buffer 1 circuit 26 is closed, decoded image information is passed from the image information processing means side to the line memory means side. and,
When only the buffer circuit 29 is closed, a circuit that bypasses the II8 encryption and assimilation circuit] 21, the encryption circuit [b] 22, the decryption circuit [b] 24, and the U'a encryption path [a-'] 25 Configure.

Next, the configuration of an embodiment in which the information transmission device with a security function of the present invention is used in a facsimile will be described.

FIG. 12 is an external view showing the overall configuration of an embodiment in which the information transmission device with a security function of the present invention is used in a facsimile.

In FIG. 12, the facsimile main body 40 includes a reading means for converting the calligraphy information written on the calligraphy manuscript into calligraphy information of electrical signals, a printing means for printing the transmitted calligraphy information, and a means for transporting the calligraphy manuscript. It has a built-in document feeding means, recording paper feeding means, etc. Handset 4
1 is for making calls when the facsimile is used as a telephone. The secrecy selection switch 42 is a switch used to encrypt the facsimile of this embodiment with a specific key and transmit it. The display switch 43 determines whether the calligraphy information sent from the other party is encrypted,
It lights up when encrypted, and cancels decryption when the secret card 60 is inserted to perform encrypted reception by operating a switch.

Each operation switch 44 is a switch when used as a facsimile. The supply port 45 is a port for feeding a calligraphic original to be read by a reading device, and the discharge port 46 is a port for discharging recording paper recorded by a printing device.

Further, the card storage box section 50 is similar to the cross-sectional view of the card storage box section 50 in FIG. 13 and the explanatory diagram showing the arrangement of the contacts 52, 53, and 54 constituting the connector in FIG. The secret card 60 is the insertion slot 5
A required number of contacts 52 are provided to read out information contained in the electrical circuit contained in the secret card 60 from the secret card 60 in an electrically connected state when the secret card 60 is inserted. Also,
The contacts 53 and 54 are open when the secret card 60 is inserted, and when the secret card 60 is not inserted, they contact each other and become conductive, thereby preventing the secret card 60 from being inserted. This is to detect that. In addition,
The concealment card 60 has a built-in circuit network of the concealment sewing information transmission means 8 shown in FIG. 2, and is shown in the connector configuration diagram of the circuit network of the information transmission means 8 with concealment function shown in FIG. , it has terminals on the I10 control means 9 side, the image information processing means 7 side, and the line memory means 1o side.

The information transmission device with a security function used for facsimile configured as described above is controlled as follows.

FIG. 16 is a flowchart showing the control of the information transmission device with security function used in the facsimile of this embodiment, and this routine is executed at the beginning of the main control program of the facsimile.

First, from the execution of the program for general facsimile transmission processing, when the confidentiality selection switch 42 is in the OFF state, steps s1 to 312 of this routine can be handled.

Further, when it is determined from the execution of the general transmission processing program of F7/Kushimiri that the secrecy selection switch 42 is in the on state, program control of this information transmission circuit with a secrecy function is entered.

In step S1, a clear signal is output to initialize the keys, and the latch of the selector & latch circuit 27 is cleared.

In step S2, the output of the key circuit 28 is set as a random number Rk, which is passed through the encryption circuit [a] 21 to generate random number information Ea (R
k). seek. In step S3, the encryption circuit [
bl 22 to obtain random number information Eb(Ea(Rk))0. Next, in step S4, the random number information Eb(Ea(Rk))o encrypted in step S3 is output to the image information processing means 7 via the buffer 1 circuit 23, and in step S5, the random number Rk set at that time is outputted. Latch. Then, in step S6, it is determined whether random number information F b (E a (Rk'')) is returned in the signal returned from the receiving side.

Random number information E returned from the receiving side in step $7
b(E a(Rk”)) by the decoding circuit [b-1] 2
4 and a decoding circuit [a'] 25 to obtain a decoded random number Rk. Then, it is determined whether the random number Rk transmitted in step S8 is a random number Rk'. When the random number Rk and the random number Rk are equal, it means that the random numbers on the sending side and the receiving side match, so the random number setting flag is set to "1" in step 311, and the random number setting flag is set to "1" in step 312. It is sent to the receiving side and the next facsimile process begins.

When the random number Rk and the random number Rk'' are not equal, step S
In step S9, the random number setting flag is set to "Ope," in step S10, the random number setting flag Ott is transmitted to the receiving side, and in step S10, the random number setting flag Ot is sent to the receiving side.
The routine processing from step $1 to step S10 is repeated until it is determined in step 8 that the transmitted random number Rk is the received random number Rk''.

On the other hand, on the receiving side, by executing the general transmission processing program of the sending side facsimile, the confidentiality selection switch 4 is
When it is received that the printer 2 is in the OFF state, the routine proceeds from step R1 to step RIO, and functions as a facsimile using normal unencrypted calligraphic information.

Then, by executing a program for one-step transmission processing of the sending side facsimile on the receiving side, the confidentiality selection switch 42 is activated.
is in the on state, step R1
A clear signal is output to initialize the key, and the latch of the selector & latch circuit 27 on the receiving side is cleared. Random number information E b(E a(Rk
) ). receive.

In step R3, random number information Eb (Ea (Rk)) is generated. is passed through the decoding circuit [b''] 24 to obtain E a(Rk)o, and further, in step R4, the random number information E a(Rk)o is passed through the decoding circuit [a''] 25 to obtain a random number Rk'.

In step R5, the random number Rk' set at that time is latched. Then, in step R6, the random number Rk' is sent to the encryption circuit [
a] 21 and encrypted random number information Ea (Rk')
, find. Furthermore, in step R7, random number information Ea(Rk
'), is passed through the encryption circuit [b 22, and the random number information E b
(Ea(Rk')), and returns the random number information Eb(Ea(Rk')) obtained in step R8 to the transmitting side. In step R9, the signal from the transmitting side is received, and in step R
10, it is determined whether the received signal is the "1" signal of the random number setting flag set in step S11, and the routine from step R1 to step R10 is continued until it is determined that the random number setting flag is "1" signal in step R10. Repeat the process.

Further, the signal received in step R10 is
When the random number setting flag set in step 1 is a "1" signal, the next facsimile program is executed with the receiving side key set to random number Rk'.

As described above, the information transmission device with a security function used in the facsimile of this embodiment has an encryption circuit [a] that encrypts the calligraphic information read for each scanning line using the random number Rk of the predetermined key circuit 28 and transmits the encrypted information. 21 and encryption circuit [bl
22, and a decryption circuit [b-1] 24 that decrypts the calligraphy and drawing information encrypted and transmitted by the encryption means according to a random number Rk of a predetermined key circuit 28.
and a decoding means consisting of a decoding circuit [a-1] 25,
key information setting means comprising a selector & latch circuit 27 and a key circuit 28 for transmitting the random number Rk of the key information selected by the 08@ encoding means and setting the random number Rk of the key information of the decoding means; The encryption/decryption avoidance means consisting of a buffer circuit 29 that avoids the encryption/decryption means and the decryption means is eliminated.

Therefore, in this embodiment, the drawing information read for each scanning line is encrypted by the encryption means according to the random number Rk of the predetermined key circuit 28, and then transmitted. The encrypted and transmitted bibliography information is processed by the decryption means using a random number R of a predetermined key circuit 28.
The calligraphy information can be decoded according to k, and the calligraphy and stroke information can be outputted to a printing means etc. by the output means, and the calligraphy and stroke information can be encrypted and transmitted.

At this time, the random number Rk of the key information to be decrypted by the decryption means
8 from the transmitting side by a key information setting means consisting of a selector & latch circuit 27 and a key circuit 28 for setting a random number Rk.
8 The key information selected by the encryption means can be transmitted and the key for the decryption means can be set.

In addition, the encryption/decryption avoidance means consisting of a buffer circuit 29 that avoids the encryption means and decryption means bypasses the processing of the encryption means and decryption means, and directly outputs the document information for each normal scanning line. be able to.

Therefore, in this embodiment, normal reception is possible by selecting the communication transmission function. Furthermore, by selecting the encrypted transmission function, it is possible to perform encrypted transmission with high security of information transmission. Also, since the sender can select a predetermined key for encryption,
It is possible to select a key that matches the document and drawing information to be transmitted.

By the way, the encryption circuit [a] 21 and the encryption circuit [b] encrypt and transmit the calligraphy information read for each scanning line in the above embodiment according to the random number Rk of the predetermined key circuit 28.
Since any encryption method can be used as long as it can be unified by a predetermined encryption circuit, the encryption means consisting of . be able to.

Further, the calligraphic information encrypted and transmitted by the encryption means of the above embodiment is decrypted according to the random number Rk of the predetermined key circuit 28, and the decrypted calligraphic information is decoded according to the random number Rk of the key circuit 28 which outputs the decrypted calligraphic information. circuit [b”]
24 and the decoding circuit [a''] 25, since any decoding method is sufficient as long as it can be decrypted by a predetermined decoding circuit, the decoding means consisting of the decoding circuit [a''] 25 decrypts the biographical information encrypted and transmitted by the encrypting means in a predetermined manner. It can be a decoding means that decodes according to the key and outputs the decoded document and stroke information to a printing means or a CRT or the like.

Then, the random number Rk of the key information selected by the encryption means of the above embodiment is transmitted, and the random number Rk of the key information of the ti encryption means is transmitted.
Selector & latch circuit 27 and key circuit 28 for setting
Since it is sufficient to obtain the key information sent from the sending side by a decryption method opposite to the predetermined encryption method, the key information setting means consisting of It can be a key information setting means for setting the key of the means.

Furthermore, the encryption/decryption avoidance means consisting of the buffer 29 that avoids the encryption means and decryption means of the above embodiment is controlled by a secret function (=l) by the internal circuit of the information transmission means 8 or by the handling of the secret card 60. Because it would be good if possible,
It can be used as an encryption/decryption avoidance means that avoids an encryption means and a decryption means.

The above-mentioned embodiment includes an encryption means consisting of an encryption circuit [a] 21 and an encryption circuit [b] 22 that encrypt and transmit the calligraphic information read for each scanning line according to the random number Rk of a predetermined key circuit 2B, and A key circuit 2 that decrypts calligraphy information encrypted and transmitted by the encryption means according to a random number Rk of a predetermined key circuit 28 and outputs the decrypted calligraphy information.
Decoding circuit [b-1] that decodes according to random number Rk of 8
24 and a decoding means consisting of a decoding circuit [a'] 25, it is possible to maintain the conventional communication transmission function and increase the security of information transmission.

Therefore, the first invention provides an encryption means for encrypting calligraphy information read for each scanning line according to a predetermined key and transmitting the encrypted calligraphy information, and decrypting the calligraphy information encrypted and transmitted by the encryption means according to a predetermined key. , and a decoding means for outputting the decoded calligraphy information.

Further, the above embodiment includes an encryption circuit [a] 21 and an encryption circuit [b] 22 that encrypt and transmit calligraphy information read for each scanning line according to a random number Rk of a predetermined key circuit 28.
and a random number R of a predetermined key circuit 28 for the calligraphic information encrypted and transmitted by the encryption means 13.
a decoding circuit [that decodes according to the random number Rk of the key circuit 28 that decodes according to k and outputs the decoded calligraphy information;
b"] 24 and a decryption circuit [a-1] 25; and an encryption/decryption avoidance means including a buffer 1 circuit 29 for avoiding the encryption means and the decryption means. Can be used with traditional communication transmission functions,
In addition, the security of information transmission can be increased by selection.

Therefore, the second invention provides an encryption means for encrypting and transmitting the calligraphy information read for each scanning line according to a predetermined key, and decrypting the calligraphy and drawing information encrypted and transmitted by the encryption means according to a predetermined key. The present invention may be configured to include a decryption means for outputting decrypted calligraphic information, and an encryption/decryption avoidance means for avoiding the encryption means and the decryption means.

The above embodiment includes an encryption circuit [a121] and an encryption circuit [b] 2 that encrypt and transmit the calligraphic information read for each scanning line according to the random number Rk of a predetermined key circuit 28.
2, and a random number R of a predetermined key circuit 28, which transmits the encrypted and transmitted calligraphic information by the encryption means.
a decoding means consisting of a decoding circuit [b'] 24 and a decoding circuit [a-1] 25 that decode according to the random number Rk of the key circuit 28 that decodes according to k and outputs the decoded document information; A selector & latch circuit 27 and a key circuit 28 that transmit the key information selected by the encryption means, transmit the random number Rk of the key information selected by the encryption means, and set the random number Rk@ of the key information of the decryption means. By providing key information setting means such as the above, the conventional communication transmission function can be maintained, and the security of information transmission can be increased by key selection on the transmitting side and the receiving side.

Therefore, the third invention provides an encryption means for encrypting and transmitting the calligraphy information read for each scanning line according to a predetermined key, and decrypting the calligraphy information encrypted and transmitted by the encryption means according to a predetermined key. , a decryption means for outputting decrypted calligraphic information, and a key information setting means for transmitting key information selected by the encryption means and setting a key for the decryption means.

Further, the above embodiment includes an encryption circuit [a] 21 and an encryption circuit [b] 22 that encrypt the calligraphic information read for each scanning line using the random number Rk of a predetermined key circuit 28 and transmit the encrypted information.
and a random number R of a predetermined key circuit 28, which encrypts and transmits the calligraphy and drawing information by the encryption means.
a decryption means consisting of a decryption circuit [b''] 24 and a decryption circuit [a-1] 25 that decrypt according to k, and a random number Rk of key information selected by the encryption means is transmitted, and the decryption means key information setting means comprising a selector & latch circuit 27 and a key circuit 28 for setting a random number Rk of key information; and an encryption/decryption avoidance means comprising a buffer circuit 29 for avoiding the encryption means and decryption means. By equipping it, it can be used with conventional communication transmission functions, and
By selecting keys on the transmitting side and the receiving side, information can be transmitted accurately and with high security.

Therefore, the fourth invention provides an encryption means for encrypting and transmitting calligraphy information read for each scanning line according to a predetermined key, and decoding the calligraphy and drawing information that has been encrypted and transmitted by the encryption means according to a predetermined key. a decryption means for outputting the decrypted calligraphic information; a key information setting means for transmitting the key information selected by the encryption means and setting a key for the decryption means; The configuration may include an encryption/decryption avoidance means that avoids the encryption/decryption avoidance means.

Therefore, in this fourth invention, the calligraphy information read for each scanning line is encrypted and transmitted by the encryption means according to a predetermined key, and the encrypted and transmitted calligraphy information is decrypted by the decryption means according to the predetermined key. , the calligraphy information is outputted by an output means such as a printing means. At this time, the key to be decrypted by the decryption means can be set by transmitting the key information selected by the encryption means from the sending side using the key information setting means. Furthermore, the encryption/decryption avoidance means bypasses the processing of the encryption means and the decryption means, and directly outputs the normal calligraphy information for each scanning line. Therefore, in particular, in the present invention, normal reception can be performed by selecting the communication transmission function, and security of information transmission can be increased by selecting the encryption transmission function. Furthermore, since the sending side can select a predetermined key for encryption, it is possible to select a key that matches the calligraphic information to be sent.

The information transmission device with a security function of the above embodiment has been described for use in facsimile; however, when implementing each of the above inventions, it may be used as a communication device for drawing and drawing information read every scanning line, such as for personal computer communication. It can be used generally.

[Effects of the Invention] As described above, the information transmission device with a concealment function of the first invention includes an 118g encrypting means for encrypting and transmitting drawing information read for each scanning line according to a predetermined key, and the encrypting means. It consists of a decoding means that decrypts calligraphic information encrypted and transmitted according to a predetermined key and outputs the decrypted calligraphic information. In addition, the security of information transmission can be increased through encryption.

Furthermore, the second invention adds an encryption/decryption avoidance means to avoid the encryption means and the decryption means to the above structure, so that the conventional non-encrypted transmission method and the encrypted transmission method can be used. can be selected using encryption/decryption avoidance means, and the security of information transmission can be increased by encryption as necessary.

The third invention is such that a key information setting means for transmitting the key information selected by the encryption means and setting a key for the decryption means is added to the configuration of the first invention.
It maintains the communication transmission function of conventional information communication equipment such as facsimile and PC communication, and also allows the sender to control key selection on the receiver, making information transmission accurate and highly secure. can.

And, since the fourth invention has the structure of the second invention and the structure of the third invention, it has the effects of the second invention and the third invention, The conventional non-encrypted transmission method and the encrypted transmission method can be selected using the encryption/decryption avoidance means, and the security of information transmission can be increased by encryption as necessary. In addition, information can be transmitted accurately and
Its safety can be increased.

[Brief explanation of the drawing]

FIG. 1 is an information transmission circuit diagram with a security function showing the overall circuit configuration of an information transmission device with a security function in the form of a card according to an embodiment of the present invention, and FIG. FIG. 3 is a specific circuit diagram of the selector circuit shown in FIG. 1, and FIG.
The figure is a concrete circuit diagram of the encryption circuit [a] shown in Figure 1, Figure 5 is a concrete circuit diagram of the encryption circuit [b] shown in Figure 1, and Figure 6 is the same as Figure 1. A specific circuit configuration diagram of the decoding circuit [b-1] shown in FIG.
a-1], FIG. 8 is a specific circuit diagram of the selector & latch circuit shown in FIG.
The specific circuit configuration diagram of the key circuit shown in the figure, Figure 10 is
11 is a specific circuit configuration diagram of the decoder circuit shown in the figure, FIG. 11 is a specific circuit configuration diagram of the power supply circuit shown in FIG. Fig. 13 is a sectional view of the card storage box section, Fig. 14 is an explanatory drawing showing the arrangement of contacts constituting the connector, and Fig. 15 is an embodiment of the invention with a concealment function. FIG. 16 is an explanatory diagram showing a connector configuration of an information transmission circuit, and FIG. 16 is a flowchart showing control of an information transmission apparatus with a security function using an embodiment of the present invention in a facsimile. In the figure, 8: information transmission means with concealment function, 20: selector circuit, 21: encryption circuit [a], 22: encryption circuit [b], 23, 26, 29: buffer 7 circuit, 24: decryption circuit [b”], 25: decoding circuit [a-1], 27: selector & latch circuit, 28: key circuit, 30: decoder circuit. In addition, in the figure, the same symbol and the same symbol are the same or This shows a considerable portion. Patent applicant: 1 person other than Aisin Seiki Co., Ltd.

Claims (4)

[Claims] (1) Encryption means for encrypting and transmitting calligraphy information read for each scanning line according to a predetermined key, and decoding the document information encrypted and transmitted by the encryption means according to a predetermined key; An information transmission device with a security function, comprising: a decoding means for outputting decoded calligraphic information. (2) Encryption means for encrypting and transmitting calligraphy information read for each scanning line according to a predetermined key, and decoding and decoding the calligraphy information encrypted and transmitted by the encryption means according to a predetermined key. 1. An information transmission device with a secrecy function, comprising: a decryption means for outputting the written and graphic information; and an encryption/decryption avoidance means for evading the encryption means and the decryption means. (3) an encryption means for encrypting and transmitting calligraphy information read for each scanning line according to a predetermined key; and decoding the calligraphy information encrypted and transmitted by the encryption means according to a predetermined key; Confidentiality characterized by comprising: a decryption means for outputting decrypted calligraphic information; and a key information setting means for transmitting the key information selected by the encryption means and setting a key for the decryption means. Functional information transmission device. (4) Encryption means for encrypting and transmitting the calligraphic information read for each scanning line according to a predetermined key, and decrypting the calligraphic information encrypted and transmitted by the encryption means according to a predetermined key. a decryption means for outputting the decrypted calligraphy information; a key information setting means for transmitting the key information selected by the encryption means and setting a key for the decryption means; and the encryption means and the decryption means. An information transmission device with a secret function, comprising: an encryption/decryption avoidance means for avoiding the encryption/decryption means;