JPH0637751A - Data adaptor - Google Patents

Abstract

PURPOSE:To provide a data adaptor in which confidentiality of reception data is secured without increasing a load of a data terminal equipment at a receiver side. CONSTITUTION:Data sent from an exchange 13 are subject to security conversion by the processing of a CPU in a data adaptor 11-2 and the result is sent to a data terminal equipment 10-2 at a receiver side. When the reception data are decoded, the data subject to security conversion are sent to the data adaptor 11-2, a CPU in the data adaptor 11-2 applies inverse conversion to the data into original data and the data are sent again to the data terminal equipment 10-2 at the receiver side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data adapter device which is connected between a switch and a data terminal and converts the transmission speed, and more particularly to a data adapter device which is provided with a confidentiality protection function for data received from the switch. Regarding

[0002]

2. Description of the Related Art Generally, in an electronic exchange, for example, a private branch exchange (PBX), internal data transmission is performed at a transmission speed of 64 kpbs. On the other hand, when performing data communication from a data terminal using a telephone network, The data terminal is configured to exchange data at a transmission rate of 4800 bps or 9600 bps using a standard serial input / output interface.

In this case, since the data transmission rate on the electronic exchange side and the data transmission / reception transmission rate on the data terminal side are different, it is necessary to establish an interface between them.

Therefore, conventionally, a data adapter has been used to provide an interface between the exchange and the data terminal. That is, as shown in FIG. 7, when the data terminal 10-1 and the data terminal 10-2 are connected via the exchange (PBX) 13, the data terminal 10-1 and the data terminal 10-2 are connected.
The data adapter 11-1 is connected to the BX 13, the data adapter 11-2 is connected to the data terminal 10-2 and the PBX 13, and the data transmission speed is set by the data adapter 11-1 and the data adapter 11-2. Do the conversion. That is, for example, when performing data transmission from the data terminal 10-1 to the data terminal 10-2, the data terminal 1
For example, a transmission rate of 4800 bp transmitted from 0-1
s serial data by the data adapter 11-1
Converts to serial data with a transmission speed of 64 kpbs and PB
Transmission speed 6 sent to X13 and output from PBX13
4 kpbs serial data is data adapter 11-2
Is converted into serial data having a transmission rate of 4800 bps and transmitted to the data terminal 10-2.

FIG. 8 shows the data adapter 11 shown in FIG.
2 shows a detailed configuration of -2. Although not shown, the data adapter 11-1 also includes the data adapter 11-
It has the same configuration as 2. That is, as shown in FIG.
The data adapter 11-2 includes a communication unit 2, a central processing unit (CPU) 3, a read only memory (ROM) 4,
A random access memory (RAM) 5 and input / output interfaces (SIO) 6 and 7 for serial communication are connected to a bus 9. The communication unit 2 is connected to the PBX 13 and S
IO7 is a data terminal 10 via a driver / receiver 8.
-2. Here, the communication unit 2 exchanges serial data at a transmission rate of 64 kpbs with the PBX 13, the CPU 3 controls the entire data adapter 11-2, and the ROM 4 controls the CPU 3 Stores programs executed by
The RAM 5 is for temporarily storing the data to be transmitted. The SIOs 6 and 7 convert serial data into parallel data and take in the data, and convert the parallel data into serial data and output the data. The data is converted into parallel data and output on the bus 9, and the parallel data on the bus 9 is converted into, for example, serial data having a transmission speed of 64 kpbs and the communication unit 2
The SIO 7 converts the serial data received by the driver / receiver 8, for example, at a transmission speed of 4800 bps into parallel data and outputs the parallel data onto the bus 9, and the parallel data on the bus 9 into, for example, The data is converted into serial data having a transmission speed of 4800 bps and output to the driver / receiver 8. The driver / receiver 8 transmits the serial data output from the SIO 7 to the data terminal 10-2 and outputs the serial data transmitted from the data terminal 10-2 to the SIO 7.

[0006] Here, from the PBX 13 to the data terminal 10-
The parallel data sent to 2 is the data adapter 11-
2 is processed as shown in FIG. That is,
The parallel data received from the PBX 13 is received by the communication unit 2 in the data adapter 11-2 and output to the SIO 6. Here, control bits are added to the front and rear ends of the parallel data output from the communication unit 2 to the SIO 6. This parallel data is converted into serial data in SIO 6 and written in a predetermined address area of RAM 5 via bus 9. Then, the data written in the RAM 5 from which the control bits at the leading end and the trailing end are removed are read from the RAM 5, and the read data are output to the SIO 7 via the bus 9. Corresponding to the transmission speed of the data terminal 10-2, for example, is converted into a transmission speed of 4800 bps serial data and output to the data terminal 10-2. Considering a case where data is transmitted from the data terminal 10-1 shown in FIG. 7 to the data terminal 10-2 in such a configuration, as described above, the data adapter 11-1 and the data adapter 11-2 are Since it has only the function of converting the transmission rate, the same data as the data sent from the data terminal 10-1 is the same.
2 where the operator of the data terminal 10-2 is absent and the data terminal 10-2 is set to the automatic reception mode, the data sent from the data terminal 10-1 is the data as it is. It is stored in the memory (not shown) of the terminal 10-2. Therefore, by operating the data terminal 10-2, anyone can see the received data from the data terminal 10-1 stored in the memory of the data terminal 10-2.

In order to solve this, it is conceivable that a predetermined password is required to search the contents of the memory of the data terminal. However, with this structure, the password is required for searching all data. Is required, and the load on the data terminal side becomes large, which is not a good idea.

[0008]

As described above, since the conventional data adapter has only the function of converting the transmission rate, the data received via this data adapter is the same as the data transmitted from the transmitting side data terminal. If this is stored in the memory of the data terminal on the receiving side, anyone can view this received data by operating the data terminal on the receiving side, which poses a problem in maintaining confidentiality of the received data. there were. In order to solve this, it is conceivable that a predetermined password is required to search the contents of the memory of the data terminal, but with this configuration, a password is required for searching all data. Moreover, the load on the data terminal side was also heavy, which was not a good idea.

Therefore, an object of the present invention is to provide a data adapter device capable of maintaining confidentiality of received data without increasing the load on the data terminal on the receiving side.

[0010]

In order to achieve the above-mentioned object, the present invention is a data adapter device for converting a transmission rate, which is connected between an exchange and a data terminal, and sends data sent from the exchange. And a confidentiality reverse conversion means for converting the confidentiality-converted data sent from the data terminal back to the original data and returning it to the data terminal. It is characterized by having.

Here, the confidentiality conversion unit performs the confidentiality conversion on condition that the first mode setting information for setting the confidential mode from the data terminal and a predetermined password are input in advance. Confidential reverse conversion means,
The confidentiality reverse conversion may be performed on condition that the second mode setting information for setting the confidentiality conversion mode and the predetermined password are input from the data terminal.

[0012]

In the present invention, the data adapter device connected between the exchange and the data terminal for converting the transmission speed is provided with the confidentiality retaining function of the received data. That is, the data transmitted from the exchange is subjected to confidentiality conversion by the confidentiality conversion means and transmitted to the data terminal on the receiving side. Here, since the received data is confidentially converted by the confidentiality conversion means of the data adapter device, even if the receiving data terminal retrieves this received data, it becomes meaningless data and the confidentiality of the received data is kept confidential. Be drunk When decrypting the received data, the confidentially converted data is transmitted to the data adapter device by a predetermined operation, the data is inversely converted into the original data by the confidentiality reverse conversion means of the data adapter device, and the data is again returned to the receiving side data terminal. Reply. This allows the data terminal on the receiving side to recognize the received data. Here, the confidentiality conversion means of the data adapter device performs confidentiality conversion of the received data on condition that the first mode setting information for setting the confidential mode from the receiving data terminal and a predetermined password are input in advance. And then
The confidentiality reverse conversion means performs the confidentiality reverse conversion of the received data on condition that the second mode setting information for setting the confidentiality conversion mode and the predetermined password are input from the receiving side data terminal.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the data adapter device of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows an outline of an embodiment of data processing at the time of receiving data by the data adapter device of the present invention. The hardware configuration of the data adapter device used in this embodiment may be the same as that of the conventional data adapter device shown in FIG. 8, and the system configuration is similar to that shown in FIG. Therefore, in the following description, reference will be made to FIGS. 7 and 8, and for convenience of description, the same reference numerals as those used in FIGS. 7 and 8 will be used for description. Note that FIG.
In the case of using the hardware configuration shown in FIG. 3, in this embodiment, the program stored in the ROM 4 and the processing in the CPU 3 based on the program are basically different from the conventional ones.
This point will become clear in the following description. Further, FIG. 1 corresponds to FIG. 9 used in the conventional description.

Referring to FIG. 1, in this embodiment, the PBX received by the communication unit 2 in the data adapter 11-2.
The received data from 13 is subjected to predetermined confidentiality conversion under the control of the CPU 3 shown in FIG. 8 and sent to the data terminal 10-2 on the receiving side. That is, the parallel data received from the PBX 13 is received by the communication unit 2 in the data adapter 11-2 and output to the SIO 6. Here, control bits are added to the front and rear ends of the parallel data output from the communication unit 2 to the SIO 6. This parallel data is converted into serial data in SIO 6 and written in a predetermined address area of RAM 5 via bus 9. In this embodiment, the RAM 5
The secret conversion is performed by removing the leading and trailing control bits from the data written in and adding "1" to the data. The secret-converted data is read out from the RAM 5 and is transferred to the SI via the bus 9.
It is output to O7, and in SIO7, this data is adjusted to the transmission rate of the data terminal 10-2, for example, the transmission rate 48.
Data terminal 10-converted to 00 bps serial data
Output to 2.

Here, the data before the confidential conversion is data A and the data after the confidential conversion is data B,
2 and 3 show examples of display data in the data terminal 10-2 when the data A is transmitted to the data terminal 10-2 as it is and when the data B whose secret is converted is transmitted to the data terminal 10-2. Here, it is assumed that a character code corresponding to a predetermined character or symbol is used as the data A, and when "1" is added to the character code corresponding to the data A, this character code corresponds to another character or symbol. Is converted to.

In this case, when the data A is directly transmitted to the data terminal 10-2, the data terminal 10-2
The display data in is as shown in FIG. 2, and in this case, this data can be decoded. However, when data B, which is the same data A as the secret data, is transmitted to the data terminal 10-2, since "1" is added to the data A, the display data at the data terminal 10-2 is different from the character code. Corresponding to that shown in FIG. 3, in which case this data cannot be decrypted even if it is viewed as it is.

FIG. 4 shows a process in the case where the data terminal 10-2 decrypts the data B which has been confidentially converted as shown in FIG. 1 and transmitted to the data terminal 10-2. In this case, the data terminal 10-2 receives the received data B
To the SIO 7 in the data adapter 11-2, and the confidential reverse conversion of the data B is performed under the control of the CPU 3 shown in FIG. The confidentiality reverse conversion of the data B is performed by the process of subtracting "1" from the data B because the confidentiality conversion in this embodiment is performed by adding "1" to the data A. This confidential reverse conversion is the R shown in FIG.
This is performed under the control of the CPU 3 based on the program stored in the OM 4.

Data B sent from the data terminal 10-2 by such processing in the data adapter 11-2
Is inversely converted into the same data A as the first received data A in the data adapter 11-2, and this data A is returned to the data terminal 10-2. As a result, the data terminal 10-2 can obtain the display screen as shown in FIG. 2, and the received data can be decoded.

FIG. 5 shows the data adapter 11-2 when the received data is subjected to confidential conversion in the data adapter 11-2.
2 is a flowchart showing the processing of the CPU 3 within -2. If the data adapter 11-2 is to perform the confidential conversion of the received data, first, the data adapter 11-
A command for setting the confidential mode, "SSSS" in this embodiment, is input from the data terminal 10-2 on the receiving side connected to the terminal 2. This command "SSSS" is the driver / receiver 8 of the data adapter 11-2, SI
It is taken in by the CPU 3 via O7 and the bus 9. CPU
3 receives the command "SSSS", it determines the confidential mode (step 101), then requests the data terminal 10-2 to input the password, and the data terminal (D
When a predetermined password, "SOS", is input from the TE) 10-2 (step 102), the confidential mode is entered, and the confidential conversion is performed by adding "1" to the received data (step 103). Then, the secret-converted data is transferred to the SIO 7 (step 104). As a result, the data from the PBX 13 received by the data adapter 11-2 from the PBX 13 undergoes confidential conversion in the data adapter 11-2 and is transmitted to the data terminal 10-2.

FIG. 6 is a flowchart showing the processing of the CPU 3 in the data adapter 11-2 when the data from the data terminal 10-2 is subjected to confidentiality reverse conversion in the data adapter 11-2. Data adapter 11-
In the case of performing the confidentiality reverse conversion of the data from the data terminal 10-2 in 2, the command for setting the confidentiality conversion mode from the data terminal 10-2 on the receiving side connected to this data adapter 11-2 is first. In this embodiment, "AAAA" is input. This command "AAAAA" is the driver / receiver 8 of the data adapter 11-2, SI
It is taken in by the CPU 3 via O7 and the bus 9. CPU
3 receives this command "AAAAA", it determines the confidentiality conversion mode (step 201), and then the data terminal 1
When a password is requested to 0-2 and a predetermined password "A" is input from the data terminal (DTE) 10-2 (step 202), this password is input when setting the confidential mode. Password, "SO
It is checked whether or not it matches S "(step 203), and if it matches, the confidentiality conversion mode is set, and the confidentiality reverse conversion is performed to subtract" 1 "from the data received from the data terminal 10-2 (step 204). The data subjected to the confidential reverse conversion in this manner is returned to the data terminal 10-2 via the SIO 7 and the driver / receiver 8. As a result, the data terminal 1
In 0-2, the display screen as shown in FIG. 2 can be obtained, and the received data can be decoded. in this way,
In this embodiment, the confidentiality of the received data can be maintained with a very simple configuration, and the password for declassification is stored only in the data adapter to which this data terminal was connected. Even if the data terminal is disconnected from the data terminal and connected to another data terminal, this declassification cannot be executed.

In the above embodiment, the confidential conversion is performed by adding "1" to the received data, and the inverse confidential conversion is performed by subtracting "1" from the data received by the data terminal 10-2. Although configured, it should be understood that the confidential conversion and the confidential inverse conversion are not limited to this, and can be similarly configured by utilizing any well-known change processing.

[0023]

As described above, according to the present invention,
Since the data adapter device connected between the exchange and the data terminal has the function of converting the confidentiality of the received data and the function of inversely converting the confidentiality in order to convert the transmission speed, the load on the receiving side data terminal is increased. This has an excellent effect that the confidentiality of the received data can be maintained without performing the above.

[Brief description of drawings]

FIG. 1 is a diagram showing an outline of an embodiment of data processing when data is received by a data adapter device of the present invention.

FIG. 2 is a diagram for explaining an example of data before confidential conversion in the embodiment shown in FIG.

FIG. 3 is a diagram for explaining an example of data after confidential conversion in the embodiment shown in FIG.

FIG. 4 is a diagram showing an outline of one embodiment of data processing at the time of data confidentiality reverse conversion by the data adapter device of the present invention.

FIG. 5 is a flowchart for explaining a data confidentiality conversion process in the data adapter device of this embodiment.

FIG. 6 is a flowchart for explaining a data confidentiality reverse conversion process in the data adapter device of this embodiment.

FIG. 7 is a system configuration diagram showing a general configuration of a data transmission system using a data adapter device.

FIG. 8 is a block diagram showing an example of a hardware configuration of a data adapter device.

FIG. 9 is a diagram showing an outline of data processing when data is received by a conventional data adapter device.

[Explanation of symbols]

2 communication unit 3 central processing unit (CPU) 4 read only memory (ROM) 5 random access memory (RAM) 6, 7 input / output interface for serial communication (S)
IO) 8 Driver / Receiver 9 Bus 10-1, 10-2 Data terminal 11-1, 11-2 Data adapter 13 Exchange (PBX)

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI Technical display location H04L 9/12 H04Q 3/58 101 9076-5K

Claims (2)

[Claims] 1. A connection between the exchange and the data terminal,
In the data adapter device for converting the transmission rate, the confidential conversion means for converting the confidentiality of the data sent from the exchange and transmitting it to the data terminal, and the confidential converted data sent from the data terminal The data adapter device is provided with a confidential reverse conversion means for converting back to the data of the above and returning it to the data terminal. 2. The confidentiality conversion unit performs the confidentiality conversion on condition that the first mode setting information for setting the confidential mode from the data terminal and a predetermined password are input in advance, The inverse conversion unit performs the confidential reverse conversion on condition that the second mode setting information for setting the confidential conversion mode and the predetermined password are input from the data terminal. The data adapter device described.