JPH0739163U - Encryption recognizer - Google Patents

Abstract

(57) [Summary] [Purpose] I want to confirm the status of ciphertext. [Structure] When there is an instruction to form a ciphertext image in step 710, the data ciphertext stored in the memory unit is converted into data that can be displayed as an image as it is without being decrypted (step 740). For example, the line end symbol EOL is inserted for each predetermined bit of data to create one page of data. This data is transmitted to the facsimile machine (step 730). The facsimile machine receives this data as normal data and prints it out. As a result, the ciphertext is output as it is from the facsimile apparatus as a pattern. If the data transmitted is encrypted differently for each transmission, the same data will be output from the fax machine as a completely different pattern.
It can be confirmed that the encryption is different for each transmission.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an encryption recognition device used in a data transmission / reception device such as a facsimile device.

[0002]

[Prior art]

 In order to conceal the communication contents of a facsimile machine, it is known that the transmitting side encrypts the data and then transmits it, and the receiving side receives the encrypted data, decrypts it, and outputs it to a sheet or the like. In a facsimile device having such a function, there is also known a device that performs different encryption for each transmission in order to further secure the security. The encryption is performed, for example, by a logical operation with data using a key. Therefore, different encryption is possible by changing this key for each transmission.

[0003]

[Problems to be solved by the device]

 However, what the operator actually sees is not the encrypted image, but the decrypted back image. Therefore, it was impossible for the operator to confirm that the encryption was actually performed and that the encryption was changed for each transmission.

[0004]

[Means for Solving the Problems]

 As shown in FIG. 1, the encryption recognition device according to claim 1 is an encryption recognition device used for a data transmission / reception device that transmits / receives encrypted data, and inputs encrypted data before decryption. It is characterized by further comprising a signal imaging means for converting the data into image data without decoding and outputting the image data to the display means.

[0005]

[Action]

 In the encryption recognition apparatus according to the first aspect, the signal imaging means converts the data before decoding into image data without decoding and outputs it to the display means. Therefore, the encrypted data itself is output as an image from the display means such as CRT, LCD or printer. Of course, this image itself cannot be decrypted by the operator because it has not yet been decrypted, but it can be judged that the sender performs different encryption for each transmission because the pattern of the image differs for each transmission.

It should be noted that the data before decryption includes the data for transmission which is encrypted by itself. In this case, it can be determined whether the data to be transmitted is encrypted differently for each transmission.

[0007]

【Example】

 As a first embodiment, FIG. 2 shows a block diagram of an encrypted data transmission / reception system using an encrypted data transmission / reception adapter. The adapter 1 includes two modem sections 3, 5, a memory section 7, a key table section 9, an operation section 11, a display section 13 and a control section 15. One modem unit 3 mediates data transmission with the directly connected facsimile device 17, and the other modem unit 5 is connected to the line. The memory unit 7 directly stores the data input from the modem units 3 and 5, and conversely outputs the stored data directly to the modem units 3 and 5. The key table unit 9 stores the individual key in association with the recipient. The operation unit 11 is provided with various keys and inputs an operator's instruction. The display unit 13 transmits a necessary message to the operator. The control unit 15 includes a CPU, ROM, RAM, I / O, etc., and is configured as a microcomputer. In addition to this configuration, there is a configuration such as a power supply circuit, but since it is not an essential part for explaining the function of this embodiment, it is omitted in the drawing.

The control unit 15 controls each of the above units to perform processing such as data processing and transmission / reception thereof. FIG. 3 shows the main processing. This process is repeatedly executed. First, when the process is started, it is determined whether or not there is data input from the line to the memory unit 7 via the modem unit 5 (step 100). For example, when no data is being input to the memory unit 7 or when data is being input from the line, it is determined to be "NO". Next, it is determined whether or not there is an instruction input and what is the content thereof (step 200). If there is an instruction input of "transmission" from the operation unit 11, it is determined whether or not transmission data exists in the memory unit 7 (step 400). For example, when there is no data in the memory unit 7, it is determined to be "NO". Then, the process is terminated as it is, and the process returns to the first process (step 100).

When the data for transmission exists, that is, when the operator performs a reading operation of the original document to the facsimile device 17 and the data is transmitted from the facsimile device 17 side, the transmission processing is performed (step 500). The details of the transmission process are shown in FIG.

First, the operation waits for the input of the destination facsimile number from the operation unit 11 (step 510). The recipient's facsimile machine number may be directly entered, or the recipient may be selected by displaying the recipient name menu on the display 13 based on the data in the key table section 9. .

If input, encryption processing is performed (step 530). The individual key corresponding to the input recipient is read from the key table unit 9 and the individual key is used to encrypt the data. The encryption may be performed with a different key for each transmission. For example, assume an encryption system in which data is encrypted with a common key, this common key is then encrypted with an individual key, and encrypted data and the encrypted common key are transmitted. If this common key is changed for each transmission, different encryption will be performed for each transmission. On the receiving side, it is sufficient to decrypt the encrypted common key with its own individual key and use this common key to decrypt the data.

Next, this encrypted data is transmitted to the facsimile device of the transmission partner via the modem section 5 and the line (step 540). In this transmission, the transmission procedure is performed by a general facsimile machine. In this way, the process ends, and the process returns to step 100 again.

At step 200, other various processes, for example, a process for adding data to the recipient-individual key table of the key table portion 9 can be selected, and the process is executed at step 600. Next, a case where data is received from another facsimile machine via the line will be described. When the modem section 5 receives the data, it is stored in the corresponding portion of the memory section 7.

After the storage is completed, it is determined to be “YES” in step 100, and the decoding process (step 700) is started. Details of the decoding process are shown in FIG. First, it is determined whether or not there is an instruction input, and what the instruction is (step 710). If there is no instruction, the processing is ended as it is.

When a predetermined ID or password is input to the operation unit 11 or a recipient-specific ID card is inserted into a card reading unit (not shown), it is determined that there is a receipt request, and an individual key corresponding to the receipt request is received. Is read from the key table unit 9 and the individual key is used to decrypt the data ciphertext stored in the memory unit 7 (step 720). Next, the data ciphertext decrypted by normal facsimile communication is transmitted to the directly connected facsimile machine 17 via the modem section 3 (step 730). Based on this data, the facsimile device 17 side outputs an image from an attached printer (not shown).

When there is an instruction to create a ciphertext image in step 710, the data ciphertext stored in the memory unit 7 is converted into data that can be displayed as an image as it is without being decrypted (step 740). For example, the line terminal symbol EOL is inserted for each predetermined bit of data to create one page of data. This data is transmitted to the facsimile device 17 (step 730). The facsimile device 17 side receives this data as normal data and prints it out. As a result, the ciphertext is directly output from the facsimile device 17 as a pattern. If the transmitted data is encrypted differently for each transmission, the same data is output from the fax machine 17 as a completely different pattern, so confirm that the encryption is different for each transmission. it can.

As another function of the adapter 1, the adapter 1 can add a parity for checking a data transmission error to the transmission data, and further, a general facsimile device has it. It can also have a function. As described above, in the present embodiment, the ciphertext itself can be converted into a pattern image, and the pattern can be visually confirmed. Therefore, it can be easily confirmed that the encryption is different for each transmission.

Next, a second embodiment in which the function of the adapter 1 is integrated with a facsimile machine will be described. As shown in FIG. 6, the facsimile apparatus 800 of this embodiment mainly includes a reading unit 802, an operating unit 804, a display unit 806, a recording unit 808, a memory unit 810, a modem unit 812, a key table unit 814, and a control unit 816. It is configured.

The reading unit 802 reads an image displayed on a document as bit data and performs a predetermined compression process or the like. The operation unit 804 is provided with various keys and inputs an operator's instruction. The display unit 806 transmits a necessary message to the operator. The recording unit 808 outputs the data in the memory unit 810 as a printed matter. The memory unit 810 directly stores the data input from the modem unit 812, and conversely outputs the data from the reading unit 802 directly to the modem unit 812. The modem unit 812 is connected to the line and inputs / outputs signals. The key table unit 814 has the same function as that of the first embodiment. The control unit 816 includes a CPU, ROM, RAM, I / O, etc., and is configured as a micro computer. The reading unit 802, the operation unit 804, the display unit 806, the recording unit 808, the memory unit 810, the modem unit 812, and the key. The table unit 814 is controlled to realize the function of a normal facsimile apparatus. Further, the key table unit 814 also realizes the same function as that of the flowchart shown in FIG. 3, similarly to the control unit 15 of the first embodiment. However, the difference is that the process of step 730 is output to the recording unit 808. The effect is the same as that of the first embodiment.

The image of the ciphertext can be applied not only to the received data but also to the ciphertext to be transmitted. For example, before step 510 shown in FIG. 4, either "send" or "encryption confirmation" is selected from the menu, and if it is transmission, the process proceeds to step 510, and if "encryption confirmation", step 530 is executed. After the equivalent processing, the processing of outputting to the facsimile device 17 or the recording unit 808 is performed. Further, the transmission process may be performed after the output.

The present invention is not limited to the above embodiments, and can be implemented in various other modes as long as the gist thereof is not changed. For example, the broadcast data transmitting / receiving device and the adapter are not limited to the facsimile device but include various digital communication devices.

[0022]

[Effect of device]

 According to the present invention, since the ciphertext itself is imaged as a pattern, it is easy to see that the cryptographic processing differs for each transmission.

[Brief description of drawings]

FIG. 1 is an exemplary configuration diagram of a device according to claim 1.

FIG. 2 is a block diagram for explaining the first embodiment of the encrypted data transmitting / receiving system.

FIG. 3 is a flowchart of processing on the adapter side.

FIG. 4 is a flowchart of a transmission process.

FIG. 5 is a flowchart of a decoding process.

FIG. 6 is a block diagram of a facsimile apparatus according to a second embodiment.

[Explanation of symbols]

1 ... adapter, 3 ... modem section, 5 ... modem section, 7 ... memory section, 9 ... key table section, 11 ...
..Operating unit, 13 ... Display unit, 15 ... Control unit, 1
7 ... Facsimile device, 800 ... Facsimile device, 802 ... Reading unit, 804 ... Operation unit, 80
6 ... Display unit, 808 ... Recording unit, 810 ... Memory unit, 812 ... Modem unit, 814 ... Key table unit, 816 ... Control unit

Claims (2)

[Scope of utility model registration request] 1. An encryption recognition device used in a data transmission / reception device for transmitting / receiving encrypted data, wherein encrypted data before decryption is input, the data is converted into image data without decryption, and display means is displayed. An encryption recognition device comprising a signal imaging means for outputting to. 2. The encryption recognition device according to claim 1, wherein the data transmission / reception device performs different encryption for each transmission.