JPH08149318A - Ciphering/decoding adaptor - Google Patents

Abstract

PURPOSE: To provide a ciphering/decoding adaptor in which ciphering and decoding processing for lots of data are attained without consumption of lots of memory areas. CONSTITUTION: The ciphering/decoding adaptor 4 is provided with an input output terminal 14, to which a personal computer is connected. A floppy disk drive or the like to store/read required data is connected to the personal computer. A main control section 54 uses a ciphering/decoding conversion section 36 to decode ciphering data from a communication line and outputs the decoded data to the personal computer via the input output terminal 14 and to store the data in a floppy disk of the personal computer. Thus, not many memory areas to store ciphering data is required and the role of the ciphering/decoding adaptor 4 is attained with a memory of a required and minimum capacity and then the inexpensive ciphering/decoding adaptor 4 is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is mounted between a communication device such as a facsimile machine and a communication line, encrypts transmission data from the communication device and transmits the encrypted data to the communication line side. The present invention relates to an encryption / decryption adapter for decrypting the encrypted received data of and transmitting it to the communication device.

[0002]

2. Description of the Related Art Various means have conventionally been proposed as means for encrypting and decrypting communication information.
For the decryption adapter, for example, the technique of Japanese Patent Laid-Open No. 2-94836 having a secret function is known. The technology intervenes in the communication between the communication device of the other side facsimile device and the communication device of the own station side facsimile device without modifying the existing communication device such as the facsimile device and encrypts / decrypts the confidential information. Then, it is structured to transmit to the communication device on the partner side or the own station side.

Communication of encrypted data is performed between encryption / decryption adapters, and the encrypted data received from the communication means on the other side is decrypted and transmitted to a communication device such as a facsimile device on the own station side. It has a structure in which transmission data (secret information) received from a communication device such as a side facsimile device is encrypted and transmitted to the communication means on the other side.

[0004]

The above-mentioned encryption / decryption adapter has the following problems to be solved. That is, since the encrypted data received from the communication device on the partner side is image data in the case of a facsimile device, it is generally a large amount of data, and once stored in the internal memory, the operator's instruction is required. It will be decrypted accordingly. However, both the encrypted image data and the image data after the decryption must be stored, which requires a large memory capacity and is inevitably expensive.

Further, before decoding is instructed, the image data before decoding must be stored in the memory of the adapter each time it is received, so that it can be received for a long time without causing an overflow error. To continue, a larger capacity I
C memory is required. As described above, the conventional encryption / decryption adapter requires a large amount of memory, and the encryption / decryption adapter tends to be expensive in terms of equipment.

Although a memory called a DRAM is usually used as a memory for storing such a large amount of data, a backup circuit is required in consideration of safe storage of data. Since a backup power supply is required to operate this backup circuit, it becomes more expensive. Considering, for example, a case where the AC input code of the encryption / decryption adapter is lost, data in the memory is lost and cannot be recovered unless a separate power source for backup is prepared. Further, another backup power source has a limited backup time.

Further, for confidential communication of image data from an image reading device such as an image scanner or image data generated by the data processing device in a data processing device such as a personal computer, a separate data processing device such as a personal computer is used. It is necessary to insert a communication addition unit such as a fax board and connect it to an encryption / decryption adapter for confidential communication. Further, between the data processing device such as a personal computer and the encryption / decryption adapter, of course, analog communication is performed as in the case of the facsimile device, so that the communication speed is very slow and it takes time. Therefore, the waiting time on the side of the data processing device such as a personal computer becomes long and the operating rate of the data processing device is reduced.

The present invention has been made to solve the above-mentioned problems, and provides an encryption / decryption adapter capable of encrypting / decrypting a large amount of data without consuming a large amount of memory. It is also an object of the present invention to provide an encryption / decryption adapter that suppresses a decrease in the operating rate of the data processing device even when the data processing device is connected.

[0009]

According to the first aspect of the present invention,
As illustrated by a solid line in FIG. 8, it is attached between the communication device and the communication line, encrypts the transmission data from the communication device and transmits the encrypted data to the communication line side, and the encrypted reception from the communication line. An encryption / decryption adapter for decrypting data and transmitting the data to the communication device, the input / output terminal being connected to a data processing device and capable of inputting / outputting a digital signal to / from the data processing device; An encryption / decryption adapter, comprising: an input / output control means for controlling an input / output signal at a terminal.

A second aspect of the present invention is the encryption / decryption adapter according to the first aspect, wherein the input / output terminal is a parallel signal input / output terminal. The invention according to claim 3 is characterized in that the input / output control means encrypts the data input from the input / output terminal and transmits the encrypted data to the communication line or the communication device. Encryption / decryption adapter.

The invention according to claim 4 further comprises, as illustrated by the alternate long and short dash line in FIG. 8, storage means which can be stored in an arbitrarily removable storage medium, and encryption which encrypts the data received from the communication device. 3. The encryption / decryption adapter according to claim 1, further comprising a storage control unit that stores the data or the encrypted data received from the communication line in the storage unit.

An invention according to claim 5 is the encryption / decryption adapter according to any one of claims 1 to 4, wherein the data processing device is a computer.

[0013]

With respect to the encryption / decryption adapter according to the first aspect, since the input / output control means controls the input / output signals at the input / output terminals, for example, the reception buffer of the encryption / decryption adapter is sequentially operated. The input encrypted data or the content of the memory storing the received encrypted data can be output as it is or after being decrypted and output from the input / output terminal. If a data processing device such as a personal computer is connected to this input / output terminal, it can be stored in a floppy by the floppy disk drive or in a magneto-optical disk by the magneto-optical disk drive. When the personal computer has a hard disk, it is possible to store a large amount of the hard disk at high speed. When decrypting, input data again from a data processing device such as a personal computer, convert it into decrypted data using the decryption function of the encryption / decryption adapter itself, and send it to the communication device. good. other than this,
It is also possible to output the decoded image data from the input / output terminal to the data processing device side such as a personal computer and use the image data in the data processing device.

Therefore, the encryption / decryption adapter does not require a large amount of memory for storing the encrypted data, and can function as an encryption / decryption adapter if it has a minimum required memory. Therefore, it is possible to provide an inexpensive encryption / decryption adapter. Moreover, if it is stored in a floppy disk, a magneto-optical disk or a hard disk, a backup power supply is unnecessary.

As a side effect, since the memory management process does not need to manage a large amount of plural kinds of data, the memory management process may be simplified. The input / output terminal may be a parallel signal input / output terminal. For example, if input / output is performed by an 8-bit parallel signal corresponding to 1 byte which is a unit of a digital signal, input / output to / from a data processing device becomes possible at extremely high speed, and data input / output is performed. Therefore, the time taken can be shortened and the decrease in the operating rate of the data processing device such as the personal computer can be suppressed.

Further, the input / output control means inputs the data from the data processing device through the input / output terminal, encrypts the image data, and transmits the encrypted image data to the communication line or the communication device, thereby creating the data processing device. The processed or processed image data can be easily transmitted to a communication device such as another facsimile device. Further, if the communication partner uses the same encryption / decryption adapter, the image data can be easily read and used by another data control device. The image can be immediately output to the recording paper by transmitting it to the communication device on the own station side.

Further, a storage means capable of storing in a freely removable storage medium is provided, and the storage control means encrypts the data received from the communication device or the encrypted data received from the communication line. May be stored in the storage means. Examples of the storage means include a floppy disk drive and a magneto-optical disk drive, and examples of the removable storage medium include a floppy disk and a magneto-optical disk.

As a result, a large amount of data can be stored and carried while being encrypted. Therefore, even if it gets into the hand of another person during storage or transportation, it is normally impossible to decrypt because it is encrypted, and high confidentiality can be maintained during storage and transportation. Further, it is possible to directly port to another data processing device via such a removable storage medium.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a block diagram of the entire communication system. The own station side facsimile device (communication device) 2 is connected to the communication line (public telephone line) 6 via the own station side encryption / decryption adapter 4. An exchange 8 is provided on the communication line 6, and is connected to a facsimile machine (communication device) 12 on the partner station side via a partner station side encryption / decryption adapter 10.

The local station side encryption / decryption adapter 4 is provided with an input / output terminal 14 and is connected to a personal computer 16. The personal computer 16 is connected to a floppy disk drive 18 for storing and reading necessary data, an image scanner 20 for reading image data, and a laser printer 22 for recording image data on recording paper. ing.

The personal computer 16 includes a CPU,
It is configured as an ordinary computer including a ROM, a RAM, an I / O, a bus line, and the like. Although not shown, a display device such as a CRT display is also connected to the personal computer 16.

The partner station side encryption / decryption adapter 10 has an input / output terminal 14 similar to the local station side encryption / decryption adapter 4 (not shown), a personal computer 16 connected to the input / output terminal 14 and a floppy disk drive. 18, image scanner 20 and laser printer 22
May be provided.

FIG. 2 shows a block diagram of the local station side encryption / decryption adapter 4. The local side encryption / decryption adapter 4 has a basic configuration as an encryption / decryption adapter.
2, a modulation / demodulation unit (modem) 34, an encryption / decryption conversion unit 36,
It is composed of a memory 38, a key decryption unit 40, and a card reader 42.

The switching unit 32 is used by the facsimile apparatus 2 of the own station.
Is connected between the communication line 6 and the communication line 6, and whether or not to intervene in communication is switched by the switching mechanism. At the time of transmission, the modulation / demodulation unit 34 demodulates the image data, which is the secret information received from the facsimile apparatus 2 on the local station side, modulates the data encrypted by the encryption / decryption conversion unit 36, and transmits the data to the communication line 6 side. Further, the modulation / demodulation unit 34 demodulates the encrypted image data received from the partner station side facsimile device 12 via the partner station side encryption / decryption adapter 10 and the communication line 6 at the time of reception, and the encryption / decryption conversion unit. The data decoded at 36 is modulated and transmitted to the facsimile device 2 of the own station. The encryption / decryption conversion unit 36 encrypts or decrypts the image data based on the key written on the card 44 inserted into the card reader 42 that is decrypted by the key decryption unit 40. The memory 38 temporarily stores the encrypted data and the decrypted data.

Further, the local station side encryption / decryption adapter 4 includes:
Key input unit 46, liquid crystal display (LCD) 48, SCS
An I controller 50, a floppy disk drive 52, and a main controller 54 are provided. The key input unit 46 is provided with a key for instructing the local station side encryption / decryption adapter 4 to perform a predetermined mode described later and other necessary processing. The liquid crystal display device 48 displays the mode status of the local station side encryption / decryption adapter 4, a selection menu or an error. The SCSI controller 50 controls the input / output interface of the 8-bit parallel signal to the input / output terminal 14 described above. Floppy disk drive 5
2 performs read / write processing for the inserted floppy disk. The main control unit 54 is configured as a computer and controls each configuration of the above-mentioned local station side encryption / decryption adapter 4 according to a program stored in an internal ROM to realize processing in an instructed mode. are doing.

The processing executed by the main controller 54 will be described with reference to the flowcharts of FIG. FIG. 3 shows the mode selection process. The selection of this mode is determined by the operator making a key input from the key input unit 46 while confirming the menu display of the liquid crystal display device 48.

When the normal mode is selected by the key input unit 46, the normal mode is set (S102).
This mode is set when the power of the local station side encryption / decryption adapter 4 is turned on, that is, in the default case. In this normal mode, when the local side encryption / decryption adapter 4 receives the encrypted data from the communication line 6 via the switching unit 32 and the modulation / demodulation unit 34, the encryption / decryption conversion unit based on the key as described above. The data is decoded at 36 and transmitted to the facsimile apparatus 2 on the local station side via the modulation / demodulation unit 34 and the switching unit 32. When the transmission data is received from the facsimile machine 2 of the own station through the switching section 32 and the modulation / demodulation section 34, the encryption / decryption conversion section 36 encrypts it based on the key as described above, and the facsimile machine 12 of the partner station side. To the modulation / demodulation unit 34, the switching unit 32, and the communication line 6.

In response to this transmission, the remote station side encryption / decryption adapter 10 decrypts the encrypted data based on the same key, and sends it to the remote station side facsimile apparatus 12. In this way, the data communication is performed in the secret state. This process is a normal confidential communication process, and detailed description thereof will be omitted.

When the input / output terminal output mode is selected, the input / output terminal output mode is set (S104).
In this mode, the local station side encryption / decryption adapter 4 performs a process of outputting the received data from the communication line from the input / output terminal 14. For transmission, the mode for transmission set at that time is followed.

When the input / output terminal input transmission mode is selected, the input / output terminal input transmission mode is set (S1).
06). In this mode, the local side encryption / decryption adapter 4
When there is an input from the input / output terminal 14, the input data is
The encryption / decryption conversion unit 36 performs a process of encrypting and transmitting to the partner station side facsimile device 12 side. For reception, the mode for reception set at that time is followed.

When the input / output terminal input reception mode is selected, the input / output terminal input reception mode is set (S1).
08). In this mode, the local side encryption / decryption adapter 4
When there is an input from the input / output terminal 14, the input data is
The encryption / decryption conversion unit 36 decrypts the data and sends it to the facsimile apparatus 2 on the local station side. For reception, the mode for reception set at that time is followed.

When the floppy output mode is selected, the floppy output mode is set (S110).
In this mode, the data received from the communication line 6 remains encrypted and is written to the floppy disk set in the floppy disk drive 52. For transmission, the mode for transmission set at that time is followed.

When the floppy input transmission mode is selected, the floppy input transmission mode is set (S1).
12). In this mode, data is read from the floppy disk set in the floppy disk drive 52, the data is encrypted by the encryption / decryption converter 36, and the data is transmitted to the facsimile machine 12 on the partner station side. . For reception, the mode for reception set at that time is followed.

When the floppy input receiving mode is selected, the floppy input receiving mode is set (S1).
14). In this mode, the data is read from the floppy disk set in the floppy disk drive 52, the data is decrypted by the encryption / decryption converter 36, and the data is transmitted to the facsimile apparatus 2 on the local station side. For reception, the mode for reception set at that time is followed.

Next, details of the input / output terminal output mode are shown in FIG.
This will be described with reference to the flowchart of FIG. This process is for communication line 6
This is a process that is executed when there is received data from. First, it is determined whether output is possible to the input / output terminal 14 (S202). For example, whether or not the personal computer 16 is in the input ready state is determined from the output permission signal of the personal computer 16 input to the input / output terminal 14, and if it is not in the input ready state,
In step S202, a negative determination is made, and the liquid crystal display device 4
An error message indicating that the personal computer 16 is not ready for input is displayed on the screen (S204), and the setting is changed to the normal mode (S206). Therefore, thereafter, reception is performed in the normal mode described above. That is, when receiving the encrypted data from the communication line, the local station side encryption / decryption adapter 4 decrypts the encrypted data in the local station side facsimile apparatus 2 based on the key as described above. Perform the process of sending.

If it is determined in step S202 that the personal computer 16 is ready for input, the received data is directly output from the input / output terminal 14 without being decoded (S208). The personal computer 16 side receives the encrypted data and writes it on a floppy disk inserted in its own floppy disk drive 18. Since image data generally has a large capacity, it is particularly preferable to store it in a large-capacity recording medium such as a magneto-optical disk. If the personal computer 16 has a hard disk, it may be temporarily stored in the hard disk. Further, it may be temporarily stored in the RAM in the personal computer 16.

The personal computer 16 can thus receive the data in the encrypted state.
Therefore, if stored in this state, even if another person tries to confirm the contents of the floppy disk, decryption is usually impossible unless the card 44 with the key is written, and the confidentiality is high even during storage. Can be maintained.

Further, when communication to another party becomes impossible, it is possible to carry the data on a floppy disk. In this case, even if only the floppy disk is robbed during transportation, the internal data is encrypted, so the confidentiality is maintained. Further, the data can be directly ported to the data processing device which cannot be connected to the local station encryption / decryption adapter 4 by using the floppy disk.

The details of the input / output terminal input transmission mode and the input / output terminal input reception mode will be described with reference to the flowchart of FIG. This process is performed by inputting from the input / output terminal 14.
This is a process executed by interruption. First, it is determined whether or not the transmission mode is set (S302). If the I / O pin input transmission mode is set, this I / O pin input transmission mode
Since this is a type of transmission mode, an affirmative decision is made in step S302.

Next, the terminal input data is encrypted (S304). That is, the data input from the input / output terminal 14 is encrypted by the encryption / decryption conversion unit 36. After that, a process of sending out to the communication line 6 via the modulation / demodulation unit 34 and the switching unit 32 and transmitting to the partner station side facsimile device 12 side is performed (S306).

As a result, the image data read by the image scanner 20 of the personal computer 16, the image data processed by the personal computer 16, or the image data read from the floppy disk inserted in the floppy disk drive 18 is
It can be sent to other facsimile machines or personal computers connected to other encryption / decryption adapters.

If the input / output terminal input reception mode is set in the local side encryption / decryption adapter 4, step S
A negative determination is made at 302, and the terminal input data is decoded (S308). That is, the input / output terminal 14
The data input from is decrypted by the encryption / decryption conversion unit 36. After that, a process of transmitting to the facsimile device 2 of the own station through the modulation / demodulation unit 34 and the switching unit 32 is performed (S310).

Therefore, when it is desired to confirm the contents of the storage floppy disk in which the encrypted data output in step S208 is recorded, the floppy disk is inserted into the floppy disk drive 18 of the personal computer 16 and the personal computer 16 side. When the encrypted data to be confirmed is read from the storage floppy disk and output to the input / output terminal 14 by the process of step S, steps S308 and S310 are executed, and the image is output as an image on the recording paper of the facsimile apparatus 2 of the own station. .

Details of the floppy output mode will be described with reference to the flowchart of FIG. This process is a process executed when an interrupt is received from the communication line 6. First, it is determined whether the floppy disk can be written (S402). Writing is performed because a floppy disk is not set in the floppy disk drive 52 of the local side encryption / decryption adapter 4, there is no capacity for writing to the floppy disk, or the floppy disk is not formatted. If it is impossible, a negative decision is made. If a negative determination is made, an error display indicating that the floppy disk cannot be written is displayed on the liquid crystal display device 48 (S404), and the setting is changed to the normal mode (S40).
6). Therefore, thereafter, reception is performed in the normal mode described above.

If an affirmative decision is made in step S402,
The received data is written in the floppy disk inserted in the floppy disk drive 52 without being decrypted (S408). In this way, you can write the encrypted data as it is on the floppy disk,
In step S208, the same effect as when the data is output from the input / output terminal 14 and written in the floppy disk by the personal computer 16 is produced.

Details of the floppy input transmission mode and the floppy input reception mode will be described with reference to the flowchart of FIG. This process is executed when the floppy input transmission mode or the floppy input reception mode is set. First, it is determined whether the data can be read from the floppy disk (S502). If the floppy disk is not set in the floppy disk drive 52 of the local station encryption / decryption adapter 4 or there is no data that can be read in the floppy disk, it is not possible to read it. To be done.
If a negative determination is made, an error display indicating that the floppy disk cannot be read is displayed on the liquid crystal display device 48 (S504), and the setting is changed to the normal mode (S5).
06). Therefore, thereafter, transmission / reception is performed in the normal mode described above.

If an affirmative decision is made in step S502,
Next, it is determined whether or not the transmission mode is set (S512). If the floppy input transmission mode is set, this floppy input transmission mode is a type of transmission mode.
A positive determination is made in step S512.

Next, the floppy input data is encrypted (S514). That is, the encryption / decryption conversion unit 36 encrypts the data input from the floppy disk inserted in the floppy disk drive 52. After that, a process of sending out to the communication line 6 via the modulation / demodulation unit 34 and the switching unit 32 and transmitting to the facsimile device 12 side of the partner station is performed (S516).

As a result, the image data read from the floppy disk can be transmitted to another facsimile machine or a personal computer connected to another encryption / decryption adapter. That is, the local side encryption /
The image data read by the image scanner of the personal computer that cannot be connected to the input / output terminal 14 of the decoding adapter 4 or the image data processed by the personal computer can be easily transmitted to another facsimile apparatus or personal computer.

If the floppy input reception mode is set in the local side encryption / decryption adapter 4, step S
A negative determination is made in 512, and the floppy input data is decoded (S518). That is, the data input from the floppy disk is transferred to the encryption / decryption conversion unit 3
Decrypt at 6. After that, the modem unit 34 and the switching unit 3
A process of transmitting to the facsimile device 2 of the own station via S2 is performed (S520).

Therefore, when it is desired to confirm the contents of the storage floppy disk in which the encrypted data output in step S208 or step S408 is recorded,
Alternatively, if the user wants to record the contents of a similar floppy disk that has been transported on a recording sheet, insert the floppy disk into the floppy disk drive 52 and set the floppy input receiving mode by the key input section 46 to store the floppy disk. The encrypted data to be checked is read out, steps S518 and S520 are executed, and the encrypted data is output as an image on the recording paper of the facsimile apparatus 2 of the own station.

The encryption process of the encryption / decryption converter 36 is not always executed without inserting the card 44 in which the key is written into the card reader 42 as described above. Further, the decryption process of the encryption / decryption conversion unit 36 is always executed without inserting the card 44 in which the same key as the key at the time of encryption is described in the card reader 42.

As described above, the encryption / decryption adapter 4 of this embodiment outputs the received data from the input / output terminal 14 and stores it in another data processing device such as the personal computer 16 or its own floppy disk drive 52. It does not require a large amount of memory for storing encrypted data, since it is stored in a floppy disk at, and it can function as an encryption / decryption adapter if it has the minimum required memory. it can. Therefore, it is possible to provide an inexpensive encryption / decryption adapter. Moreover, because it is stored on a floppy disk, no backup power supply is required. Also, as a side effect, the memory 3
Also in the memory management process for 8, it is not necessary to manage a large amount of plural types of data, and therefore the memory management process is simplified.

Since the encrypted data can be stored in the floppy disk, a large amount of data remains encrypted,
It can be stored and carried. Therefore, even if it gets into the hand of another person during storage or transportation, it is normally impossible to decrypt because it is encrypted, and high confidentiality can be maintained during storage and transportation.

Further, the data can be directly ported to the data processing device which cannot be connected to the encryption / decryption adapter 4 by the floppy disk. The input / output terminal 14 has 8
It is an input / output terminal of a bit parallel signal, and is input / output by an 8-bit parallel signal corresponding to 1 byte which is a unit of a digital signal. When a fax board is used for a personal computer as in the conventional case, the communication with the encryption / decryption adapter becomes an analog signal and the communication speed is up to about 14400 bps. Since it is an 8-bit parallel digital signal by the SCSI control unit 50, it is 5000 times or more, that is, 80 Mbps, and input / output with the data processing device becomes possible at extremely high speed. Therefore, only for the input and output of data,
Personal computer 16 to reduce the time taken
It is possible to suppress a decrease in operating rate on the side.

When the personal computer 16 receives the decrypted data, the laser printer 22 of the personal computer 16 can output the data on the recording paper. In the above embodiment, the main control unit 54 corresponds to the input / output control means. A floppy disk or a magneto-optical disk corresponds to a storage medium that can be arbitrarily attached and detached.

[Others] The personal computer 16 may have a mode for receiving the decoded data via the input / output terminal 14. If it is decrypted, the personal computer 16 can immediately process the image data, and the processed data can be transmitted to another personal computer or a facsimile device via the communication line 6.

When the floppy disk drive 52 stores the data in the floppy disk, not only the encrypted data but also the decrypted data may be stored. In this way, data that does not need to be kept secret can be stored in a state where it can be immediately confirmed. Furthermore, the encryption / decryption adapter 4 may function as a decryption or encryption processing device. That is, after the unencrypted image data from the input / output terminal 14 or the floppy disk of the floppy disk drive 52 is encrypted, the input / output terminal 14
Output to, or floppy disk drive 5
You may write it on the second floppy disk. On the contrary, even if the encrypted image data from the floppy disk of the input / output terminal 14 or the floppy disk drive 52 is decrypted, it is output to the input / output terminal 14 or written in the floppy disk of the floppy disk drive 52. good.

[Brief description of drawings]

FIG. 1 is a block diagram of an entire communication system.

FIG. 2 is a block diagram of a local station side encryption / decryption adapter.

FIG. 3 is a flowchart of a mode selection process.

FIG. 4 is a flowchart of input / output terminal output mode processing.

FIG. 5 is a flowchart of input / output terminal input transmission / reception mode processing.

FIG. 6 is a flowchart of floppy output mode processing.

FIG. 7 is a flowchart of floppy input transmission / reception mode processing.

FIG. 8 is a block diagram illustrating a basic configuration of the present invention.

[Explanation of symbols]

2 ... Facsimile device on own station 4 ... Encryption / decryption adapter on own station 6 ... Communication line 8 ... Switch 10 ... Encryption / decryption adapter on partner station 12 ... Facsimile device on partner station 14 ... Input / output terminal 16 ... Personal computer 18 ... Floppy disk drive 20 ... Image scanner 22 ... Laser printer
32 ... Switching unit 34 ... Modulation / demodulation unit 36 ... Encryption / decryption conversion unit 38 ...
Memory 40 ... Key decryption unit 42 ... Card reader 44 ... Card 46 ... Key input unit 48 ... Liquid crystal display device 50 ... S
CSI control unit 52 ... Floppy disk drive 54 ... Main control unit

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location H04L 9/10 9/12 H04N 1/00 107 A

Claims (5)

[Claims] 1. A device mounted between a communication device and a communication line, which encrypts transmission data from the communication device and transmits the encrypted data to the communication line side, and decrypts encrypted reception data from the communication line. An encryption / decryption adapter for transmitting to the communication device, the input / output terminal being connected to a data processing device and capable of inputting / outputting a digital signal to / from the data processing device; An encryption / decryption adapter comprising: input / output control means for controlling signals. 2. The encryption / decryption adapter according to claim 1, wherein the input / output terminal is a parallel signal input / output terminal. 3. The encryption / decryption according to claim 1, wherein the input / output control means encrypts the data input from the input / output terminal and transmits the data to the communication line or the communication device. Decryption adapter. 4. A storage means that can be stored in a storage medium that is freely removable, and encrypted data obtained by encrypting data received from the communication device or received from the communication line is stored in the storage means. The encryption / decryption adapter according to claim 1 or 2, further comprising: 5. The encryption / decryption adapter according to claim 1, wherein the data processing device is a computer.