JPH01246963A - Information transmitter with secret keeping function - Google Patents

Abstract

PURPOSE:To easily change enciphering of transmitting information by incorporat ing an enciphering means which transmits character and picture information read at every scanning line and a decoding means which outputs enciphered character and picture information after decoding into a card means. CONSTITUTION:An enciphering means composed of enciphering circuits 21 and 22 transmits character and picture information read at every scanning line after enciphering the information in accordance with a 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 the enciphering means after decoding the information in accordance with a prescribed random number of the key circuit 28. The enciphering and decoding means are incorporated into a secret keeping card 60. When the card 60 is inserted into a card inserting section 50, the enciphering and decoding means are actuated. Therefore, when the card 60 is replaced with another, enciphering of transmitting information can be changed easily.

Description

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

"Conventional Technology" With the progress of current information transmission technology, a wide range of information devices from industrial to consumer use are emerging.

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] However, with the increase in the number of information communication devices using wireless media, or the increase in the use of wired and wireless mixed networks, the security of information transmission, such as misdirection, eavesdropping, and conversion, has increased. Gender 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.

In addition, in order to increase the security of information transmission from mis-delivery, wiretapping, political transactions, etc., it is possible to encrypt the information before transmission, but if that encryption is analysed, it loses its meaning. There was a problem.

SUMMARY OF THE INVENTION An object of the present invention is to provide an information transmission device with a security function that maintains the conventional communication transmission function, allows easy changes in the encryption of information transmission, and increases the security of information transmission.

[Means for Solving the Problems] An information transmission device with a security function according to the present invention includes an encryption means for encrypting and transmitting drawing information read for each scanning line; A decoding means for decoding the calligraphy information and outputting the decoded calligraphy and drawing information is built into the card means, and the operation of the encrypting means and the decoding means is enabled by inserting the card means.

[Operation] In the present invention, there is provided an encryption means for encrypting and transmitting the calligraphy information read for each scanning line, and decoding the calligraphy information encrypted and transmitted by the encryption means, and outputting the decrypted calligraphy information. The card means has a built-in decryption means, and when the card means is inserted into the card storage section, the encryption means and the decryption means can operate.

Therefore, since the encryption means and decryption means can be changed by changing the card means, if the card means is changed as necessary, there is no risk of information leakage even if information is transmitted incorrectly to a person other than the designated users. There is no. In addition, the conventional communication transmission function is maintained by cutting the center of the card means,
By inserting the card means into the card storage section, it is easy to switch the encryption of information transmission.

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

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

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 line or a facsimile line.
Further, in the case of a car phone, the telephone line must be constructed of 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.

The line network control means 1 and the modem means 2 may be changed depending on the type of communication such as wired communication or wireless communication or the purpose. Furthermore, the facsimile of this embodiment has the following components.

The operation switch and display means 3 includes switches for driving the facsimile machine and displays necessary for control, and the motor control and sensor means 4 includes 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 a control circuit for program-controlling the 77' kushimi device consisting of the above-mentioned electronic control circuit MPU, and a program for controlling the electronic control circuit MPU is stored in a built-in ROM. The 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 transmission means 8 with a secret function of this embodiment includes an encryption means and a decryption means for encrypting and decrypting image information, and an encryption/decryption avoidance means for evading the encryption means and decryption means. It is equipped with a data bus, an address bus, and a ! Connected to the ILJ bus.

The line memory means 10 also 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 stored line by line.

The reading/storage control means 11 is a printing means or a CR.
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 a display means such as T, and the recorded information read by the reading scanning means 13 side consisting of a reading means etc. The memory area is controlled in units of one line.

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 a diagram of a confidential information transmitting means showing a circuit configuration of the confidential information transmitting means 8 formed into a card as shown in FIG. 12 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 consists of two adder circuits (HC83), as shown in FIG. It adds the bit line-by-line stroke information to the key output and outputs the result. In addition, the encryption circuit [b] 22 is composed of two exclusive OR circuits (HC86), as shown in FIG. The output is an exclusive OR with the key output.

The decoding circuit [b-1] 24 includes two exclusive OR circuits (HC86), as shown in FIG.
), 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 includes two adder circuits (H
C83), which performs an addition operation of the exclusive OR calligraphy information from the decoding circuit [b"] 24 with the negated key output, that is, a subtraction operation between the exclusive OR calligraphy information and the key output. This is what is output.

The selector & latch circuit 27 consists of two buffers: F (HC245) and a latch (8212), as shown in FIG. 8, and the encryption circuit [a] 2
1(7) Output The buffer for the output of the output decoding circuit [b-'] 2.4 is switched by a direction control signal, and the output point is temporarily stored in a latch.

Further, the key circuit 28 is made up of a ROM that stores specific key information that outputs 8 hits in response to 8 bit input, as shown in FIG. 9 whose specific circuit configuration is shown. .

The decoder circuit 30, as shown in FIG. 10, has an encrypted signal CYS and a memory read signal MR.
, memory write signal MW, and memory address stroke signal MAS, the presence or absence of an encrypted signal, a reception operation signal, a transmission operation signal, and a write/read signal are obtained.

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, the buffer circuit 26, and the 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 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, the encryption circuit [a]
21 and the encryption circuit [b] 22 and the decryption circuit [b]
] 24 and the decoding circuit [a-1] 25.

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 security function of the present invention is used for 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 feeder, recording paper feeder, etc. Handset 4
1 is used to make a call 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 it is encrypted, and cancels decoding when a secret card 60 as a card means 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.

In addition, the card storage section 50 is the card storage section 5 in Fig. 13.
0 and the contact 5 constituting the connector in FIG.
As shown in the explanatory diagram showing the arrangement of the contacts 53 and 54, when the secret card 6o is inserted from the insertion slot 51, the information contained in the electric circuit contained therein is transferred from the secret card 60. A necessary number of contacts 52 are provided to read out the information in an electrically connected state. In addition, the contacts 53 and 54 are open when the secret card 6o is inserted, and when the secret card 60 is not inserted, they contact each other and become electrically conductive, so that the secret card 60 is not inserted. It detects the presence or absence of

The concealment card 60 has a built-in circuit network corresponding to the information transmission means 8 with a concealment function shown in FIG. , I10 has terminals connected to the control means 9 side, the image information processing means 7 side, and the line memory means 10 side. These terminals are connected by a plurality of contacts 52.
It is electrically connected to the secret card 60. Therefore, when the secret card 6O is inserted into the insertion slot 51 of the card storage section 50, the terminals of the secret card 60 are connected to the plurality of contacts 5.
At the same time, the contacts 53 and 54 are opened by the secret card 60. Further, when the secret card 60 is handled from the insertion slot 51 of the card storage section 50, the terminals of the secret card 60 are electrically insulated from the plurality of contacts 52, and at the same time, the contacts 53 and 54 are closed. Become.

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 S312 of this routine can be handled.

Furthermore, when it is determined from the execution of the program for general facsimile transmission processing that the confidentiality selection switch 42 is in the on state, program control of the information transmission circuit with security 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, and it is passed through the encryption circuit [a] 21 to generate random number information E a (R
k) Find o. In step S3, the encryption circuit [
bl 22 and random number information Eb (Ea (Rk)). seek. Next, in step S4, the random number information Eb(Ea(Rk))O encrypted in step S3 is outputted to the image information processing means 7 via the buffer circuit 23, and in step S5.

The random number Rk set at that time is latched. Then, in step S6, random number information E b (
It is determined whether E a(Rk”))x has been returned.

In step S7, the random number information returned from the receiving side is passed through the decoding circuit [a'] 25 to obtain the decoded random number Rk.Then, the random number Rk sent in step $8 is the random number Rk. to judge. 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 in step 311 the random number setting flag is set to ``1''.
", and in step 312, the random number setting flag "1" is transmitted to the receiving side, and the next facsimile processing begins.

When the random number Rk and the random number Rk'' are not equal, step S
In step 9, the random number setting flag is set to "Otp", and in step 310, the random number setting flag "Ott" is transmitted to the receiving side, until it is determined that the transmitted random number Rk is the received random number Rk in step S1. From step S10
Repeat the routine processing.

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
2 is in the off state, the routine passes through steps R1 to R10 and functions as a facsimile using normal unencrypted calligraphic information.

Then, by executing the general transmission processing program of the sending 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 0.

In step R3, random number information Eb (Ea (Rk)) 0 @
Through the decoding circuit [b-1] 24, E a (Rk).

Then, in step R4, random number information E a(Rk)
0 is passed through the decoding circuit [a-1125 to obtain a random number Rk'.

In step R5, the random number Rk' set at that time is latched. Then, in step R6, Ran 1! &Rk' is passed through the decryption circuit [a] 21, and the encrypted random number information Ea(R
k') Find x. Furthermore, in step R7, random number information E
a(Rk')x is passed through the decoding circuit [bl22 to obtain random number information Eb(Ea(Rk"))8, and step
The random number information E b (E a (Rk'))x obtained in step 2 is returned to the transmitting side. In step R9, the signal from the transmitter is received,
It is determined whether the signal received in step R10 is the "1" signal of the random number setting flag set in step S11, and the routine from step R1 to step R10 is performed until it is determined that the random number setting flag is "1" signal in step R10. Repeat the process. In addition, when the signal received in step R10 is the "1pa signal" of the random number setting flag set in step 811, with the receiving side key set to random number Rk', the following:
Execute the facsimile program.

゛ As mentioned above, the information transmission device with a security function used in the facsimile of this embodiment has an encryption circuit [a ] 21 and encryption circuit [
bl 22, and the calligraphy information encrypted and transmitted by the encryption means is sent to a predetermined key circuit 2.
Decoding circuit [b-1] that decodes according to random number Rk of 8
24 and a decryption circuit [a-1] 25; and a selector & latch that transmits a random number Rk of key information selected by the encryption means and sets the random number Rk of the key information of the decryption means. It comprises key information setting means consisting of a circuit 27 and a key circuit 28, and encryption/decryption avoidance means consisting of a buffer circuit 29 for avoiding the encryption means and decryption means.

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 transmitted calligraphic information is processed by the decryption means using a random number Rk of a predetermined key circuit 28.
The calligraphy and stroke information can be decoded according to the following, 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
A key information setting means consisting of a selector & latch circuit 27 and a key circuit 28 for setting a random number Rk@ can transmit the key information selected by the encryption means from the transmitting side and set the key for the decryption means.

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.

As described above, in the embodiment of the present invention, from the encryption circuit [a] 21 and the encryption circuit [b] 22, which encrypt the calligraphy information read for each scanning line using the random number Rk of the predetermined key circuit 28 and transmit it. and a decryption circuit [b
-1] 24 and a decoding circuit [a-1] 25; a card means consisting of a secret card 60 incorporating the encryption means and the decryption means; and by inserting the card means, the encryption It is equipped with a card storage section 50 that enables the operation of the encoding means and the decoding means.

Therefore, since the encryption means and the decryption means can be changed by changing the secret card 60 which is a card means, if the secret card 60 is replaced as necessary, there is no possibility of mis-delivery of information to other than the designated users. There is also no risk of information leaking. In addition, the conventional communication transmission function is maintained by handling the secret card 60, and the secret card 60
By inserting it into the card storage section 50, the encryption of information transmission can be switched, and when used in non-encryption mode, there is no need to set it in the secret card 60, and the secret card 60 Switching can be done simply by adjusting the .

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.
The encryption means consisting of 22 may be any encryption method as long as it can be encrypted by a predetermined encryption circuit.
When carrying out the present invention, the encrypting means can be used to encrypt and transmit the biographical information read for each scanning line.

Furthermore, a decoding circuit [b''] 24 and a decoding circuit [a
”] Since the decoding means consisting of 25 only needs to be able to encrypt with a predetermined decoding circuit using any decoding method, when carrying out the present invention, the decoding means consisting of It can be used as a decoding means for decoding and outputting the calligraphic and stroke information to a printing means or a CRT or the like.

The card means consisting of the secret card 60 incorporating the encryption means and the decryption means of the above embodiment is electrically connected between the terminals of the secret card 60 and the contacts 52 of the card storage section 50. .

However, the electrical coupling when implementing the present invention is not limited to the above configuration, and the two may be connected by electromagnetic coupling, electrostatic coupling, optical coupling, etc.

Furthermore, there is a power storage section 50 which enables the operation of the encryption means and decryption means by inserting the card means of the above embodiment.
For example, when the present invention is implemented, it is sufficient that the concealed card 60 can be connected to the electrical connection means disposed in the card storage section 50 when the concealed card 60 is inserted as a card means in a predetermined position. In this case, the card storage section may be configured such that the encryption means and the decryption means can be operated by inserting the card means into a specific position.

Although the information transmission means with a concealment function of the above embodiment has been described for use in facsimile, when implementing the above invention, it may be used in general communication equipment for information on drawings and drawings read every scanning line, such as for personal computer communication. It is possible.

[Effects of the Invention] As described above, the information transmission device with a secrecy function of the present invention includes an encryption means for encrypting and transmitting the biographical information read for each scanning line, and an encryption means for encrypting and transmitting the biographical information read by the encryption means. The F! Since it enables the operation of f3 encryption means and decryption means, the encryption means and decryption means can be changed by changing the card means, so if the card means is changed as necessary, a predetermined user can Even if there is erroneous delivery or eavesdropping of information transmission,
There is no risk that the transmitted information will be passed on to a third party. Furthermore, there is no fear that the information will be lost during the information transmission process, and the security of information transmission can be improved. Furthermore, the conventional communication transmission function is maintained by changing the card means, and by inserting the card means into the card storage section, it is easy to switch the encryption of information transmission.

[Brief explanation of the drawing]

Fig. 1 is an information transmission circuit diagram with a secrecy function showing the overall circuit configuration of an information transmission device with a secrecy function in the form of a card according to an embodiment of the present invention. Figure 3 is an overall configuration circuit diagram of an embodiment used for facsimile, and Figure 4 is a specific circuit configuration diagram of the selector circuit shown in Figure 1.
The figure is a p-body circuit configuration diagram of the encryption circuit [a] shown in FIG. 1, FIG. 5 is a specific circuit configuration diagram of the encryption circuit [b] shown in FIG. A specific circuit configuration diagram of the decoding circuit [b”] shown in FIG.
"], FIG. 8 is a specific circuit diagram of the selector & latch circuit shown in FIG. 1, FIG. 9 is a specific circuit diagram of the key circuit shown in FIG. 1, and FIG. is a specific circuit configuration diagram of the decoder circuit shown in Figure 1, and Figure 11 is the specific circuit configuration diagram of the decoder circuit shown in Figure 1.
A specific circuit configuration diagram of the power supply circuit shown in the figure, FIG. 12 is an external view showing the body configuration of an embodiment in which the information transmission device with a secret function of the present invention is used in a facsimile, and FIG. 13 is a cross-sectional view of the card storage section. Fig. 14 is an explanatory diagram showing the arrangement of contacts constituting the connector, Fig. 15 is an explanatory diagram showing the connector configuration of the information transmission means with security function according to the embodiment of the invention, and Fig. 16 is an explanatory diagram showing the arrangement of the contacts constituting the connector. This is a flowchart showing control of an information transmission means with a security function using a facsimile as an example. 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 circuit, 24: decryption circuit [ b-1], 25: decoding circuit [a''], 27: selector & latch circuit, 28: key circuit, 30: decoder circuit, 50: card storage section, 60: secret card. , the same symbol, and the same symbol indicate the same or equivalent parts. Patent applicant: 1 person other than Aisin Seiki Co., Ltd.

Claims (1)

[Scope of Claims] Encryption means for encrypting and transmitting calligraphy information read for each scanning line; and decoding for decoding calligraphy information encrypted and transmitted by the encryption means and outputting the decrypted calligraphy information. a card means incorporating the encryption means and the decryption means; and a card storage part that enables the encryption means and the decryption means to operate by inserting the card means therein. An information transmission device with a secrecy function.