JP4280395B2 - Data transmission apparatus, data transmission system, data transmission method, and recording medium - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a data transmission apparatus, a data transmission system, a data transmission method, and a recording medium, and is particularly suitable for use in a data transmission apparatus that transmits highly confidential data.
[0002]
[Prior art]
Conventionally, data transmission has been performed in which a plurality of devices at different locations are connected using a communication line to exchange data. In particular, due to recent developments in network technology, not only text data such as plain text and voice data, but also large amounts of data such as image data, highly confidential personal data, corporate data, etc. are transmitted via communication lines. Has come to be done.
[0003]
[Problems to be solved by the invention]
However, in the conventional data transmission method, if the transmission / reception data is intentionally intercepted from the communication line, the transmission / reception data can be easily obtained, and highly confidential personal data, corporate data, etc. are obtained. There is a problem that sufficient security cannot be obtained for transmission.
[0004]
Also, when transmitting a large amount of data such as image data, even if the image data is compressed by the JPEG method or MPEG method, the size of the compressed data after compression is limited, and the compressed data is transmitted using a communication line. However, there was a problem that a very long communication time was required.
[0005]
The present invention has been made to solve the above-described problem, and an object of the present invention is to improve security even when intercepted in a system that performs data transmission.
[0006]
[Means for Solving the Problems]
The data transmission apparatus of the present invention is a data transmission apparatus that performs data transmission using a plurality of communication lines having different line speeds, and is determined by a determination unit that determines the sensitivity of input data and the determination unit. According to the sensitivity, the determination means for determining whether the input data is divided and transmitted or not divided, and the determination means determines that the input data is divided and transmitted If it is determined, the input data is divided and distributed to the plurality of communication lines according to the line speed ratio of the plurality of communication lines, and the input data is divided by the determination means. The data distributed by the distribution means is transmitted using the plurality of communication lines, and the input data is not divided by the determination means. When it is determined that the transmission is characterized in that it comprises transmitting means for transmitting the data the input using one communication line of the plurality of communication lines.
[0009]
The data transmission system of the present invention is a data transmission system that performs data transmission using a plurality of communication lines having different line speeds, and is determined by a determination unit that determines the sensitivity of input data and the determination unit. According to the sensitivity, the determination means for determining whether the input data is divided and transmitted or not divided, and the determination means determines that the input data is divided and transmitted If it is determined, the input data is divided and distributed to the plurality of communication lines according to the line speed ratio of the plurality of communication lines, and the input data is divided by the determination means. The data distributed by the distribution means is transmitted using each of the plurality of communication lines, and the input data is determined by the determination means. If it is determined to transmit without dividing, the transmission means for transmitting the input data using one communication line of the plurality of communication lines, and the transmission means via the plurality of communication lines. Receiving means for receiving the divided data transmitted in the above manner, and restoring means for combining the divided data respectively received from the plurality of communication lines by the receiving means by a predetermined method to restore the data before division. It is characterized by providing.
[0010]
The data transmission method of the present invention is a data transmission method for performing data transmission using a plurality of communication lines having different line speeds, and divides the input data according to the sensitivity of the input data. If it is determined that the input data is to be divided and transmitted in the determination step, the determination step of determining whether to transmit or not transmit, and depending on the line speed ratio of the plurality of communication lines The input data is divided and distributed to the plurality of communication lines, the distributed data is transmitted using the plurality of communication lines, and the input data is not divided in the determination step. A transmission step of transmitting the input data using one communication line of the plurality of communication lines when it is determined to transmit.
[0013]
The computer-readable recording medium of the present invention is characterized in that a program for causing a computer to function as each of the above-described means is recorded.
Another feature of the computer-readable recording medium of the present invention is that a program for causing a computer to execute the procedure of the data transmission method is recorded.
[0014]
According to the present invention configured as described above, it is determined whether the data is to be divided and transmitted according to the sensitivity of the input data or not to be divided, and it is determined that the data is divided and transmitted. If it is determined that the divided data is distributed and transmitted through the plurality of communication lines according to the line speed ratio of the plurality of communication lines, and the data is transmitted without being divided, it is input. The transmitted data is transmitted through one of the plurality of communication lines. Thus, when transmitting highly sensitive data, only a part of the data is transmitted to each of the plurality of communication lines, so that one communication line of the plurality of communication lines is intercepted. Even so, it will not be possible to restore the data.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram illustrating a configuration example of a system that performs data transmission using the data transmission apparatus of the present embodiment.
[0017]
In FIG. 1, 10 is a first data transmission device, and 20 is a second data transmission device. In the present embodiment, the first and second data transmission devices 10 and 20 have a transmission / reception function, and the first data transmission device 10 and the second data transmission device 20 perform the first communication. Data transmission is performed via the line 30, the second communication line 40, and the third communication line 50.
[0018]
Reference numeral 11 denotes a data distribution / combination unit in the first data transmission apparatus 10, which includes a data distribution unit 12 and a data combination unit 13. When data is transmitted, the data distribution unit 12 divides the data according to the number of communication lines, the line speed, and the like, and the divided data is sent to the first, second, and third transmission / reception units 14, 15, 16. Distribute. Further, when dividing the data, the data distribution unit 12 adds position data indicating the position (order) before the data is divided to the divided transmission data.
[0019]
When the data combination unit 13 receives the divided data via the first to third communication lines 30, 40, 50 and the first to third transmission / reception units 14, 15, 16, Based on each added position data, the received data is combined and restored before being divided and output.
[0020]
The first transmission / reception unit 14 modulates the divided data supplied from the data distribution unit 12 by a method corresponding to the first communication line 30, and transmits the second data transmission device via the first communication line 30. It transmits to the 1st transmission / reception part 24 in 20. FIG. In addition, the first transmission / reception unit 14 receives data transmitted from the first transmission / reception unit 24 in the second data transmission device 20 via the first communication line 30, and receives the received data as the first data The data is demodulated by a method corresponding to the communication line 30 and the data is supplied to the data combining unit 13.
[0021]
The second transmission / reception unit 15 modulates the divided data supplied from the data distribution unit 12 by a method according to the second communication line 40, and transmits the second data via the second communication line 40. The data is transmitted to the second transmission / reception unit 25 in the device 20. In addition, the second transmission / reception unit 15 receives data transmitted from the second transmission / reception unit 25 in the second data transmission device 20 via the second communication line 40, and receives the received data as the second transmission line. The data is demodulated by a method corresponding to the communication line 40 and the data is supplied to the data combining unit 13.
[0022]
The third transmission / reception unit 16 modulates the divided data supplied from the data distribution unit 12 by a method according to the third communication line 50, and transmits the second data via the third communication line 50. It transmits to the 3rd transmission / reception part 26 in the apparatus 20. FIG. The third transmission / reception unit 16 receives data transmitted from the third transmission / reception unit 26 in the second data transmission device 20 via the third communication line 50, and receives the received data as the third The data is demodulated by a method corresponding to the communication line 50 and the data is supplied to the data combining unit 13.
[0023]
A data distribution / combination unit 21 in the second data transmission apparatus 20 includes a data distribution unit 22 and a data combination unit 23. Reference numeral 24 denotes a first transmission / reception unit, 25 denotes a second transmission / reception unit, and 26 denotes a third transmission / reception unit. The data distribution / combination unit 21, the data distribution unit 22, the data combination unit 23, and the first to third transmission / reception units 24 to 26 are the data distribution / combination unit 11 and the data distribution unit included in the first data transmission apparatus 10. 12, the data combination unit 13 and the first to third transmission / reception units 14 to 16 have the same functions, and thus redundant description is omitted.
[0024]
Next, the operation will be described with reference to FIGS.
FIG. 2 is a diagram for explaining an example of the operation of the system performing the data transmission shown in FIG. 2 shows data {a ₁ , a ₂ , a ₃ , a ₄ , a ₅ , a ₆ ,... From the first data transmission device 10 to the second data transmission device 20. . . }, And the line speeds of the first to third communication lines 30, 40, and 50 are all equal.
[0025]
In FIG. 2, data {a ₁ , a ₂ , a ₃ , a ₄ , a ₅ , a ₆ ,. . . }, The data distribution unit 12 divides the input data in accordance with the number of communication lines and the line speed, and position data indicating the position (order) of the data before the division. Append. Next, the data distribution unit 12 distributes the divided partial data to which position data is added to the first to third transmission / reception units 14 to 16.
[0026]
In the system shown in FIG. 2, since the line speeds of the first to third communication lines 30, 40, 50 are all equal, the data distribution unit 12 sends partial data {a ₁ , a ₄ , . . . }, Partial data {a ₂ , a ₅ ,. . . }, Partial data {a ₃ , a ₆ ,. . . } Is distributed.
[0027]
The first to third transmission / reception units 14 to 16 to which the divided partial data are supplied are partial data supplied in a manner corresponding to the first to third communication lines 30, 40, and 50 connected thereto, respectively. Is then transmitted to the second data transmission apparatus 20 via the first to third communication lines 30, 40 and 50, respectively.
[0028]
The partial data transmitted to the second data transmission device 20 via the first to third communication lines 30, 40, 50 are the first to third transmission / reception units 24 to 24 in the second data transmission device 20. 26, respectively. The received partial data is demodulated by the first to third transmission / reception units 24 to 26 in a manner corresponding to the first to third communication lines 30, 40, and 50 and supplied to the data combination unit 22. The
[0029]
Next, the data combining unit 22 combines the supplied partial data according to the position data added to each data constituting the partial data at the time of transmission, and the data {a ₁ , a ₂ , a ₃ , a ₄ , a ₅ , a ₆ ,. . . } Is restored and output.
[0030]
FIG. 3 is a diagram for explaining another example of the operation of the system performing the data transmission shown in FIG. 3 shows data {b ₁ , b ₂ , b ₃ , b ₄ , b ₅ , b ₆ ,... From the second data transmission device 20 to the first data transmission device 10. . . }, And the line speed ratio of the first to third communication lines 30, 40, 50 is assumed to be 3: 2: 1.
[0031]
In FIG. 3, the data {b ₁ , b ₂ , b ₃ , b ₄ , b ₅ , b ₆ ,. . . }, The data distribution unit 22 divides the input data in accordance with the number of communication lines and the line speed, and position data indicating the position (order) of the data before the division. Append. Next, the data distribution unit 22 distributes the divided partial data to which the position data is added to the first to third transmission / reception units 24 to 26.
[0032]
In the system shown in FIG. 3, since the line speed ratio of the first to third communication lines 30, 40, 50 is 3: 2: 1, the data distribution unit 22 sends partial data to the first transmission / reception unit 24. {B ₁ , b ₂ , b ₃ ,. . . }, Partial data {b ₄ , b ₅ ,. . . }, Partial data {b ₆ ,. . . } Is distributed.
[0033]
Next, the first to third transmission / reception units 24 to 26 modulate the partial data supplied in a manner according to the first to third communication lines 30, 40, and 50 connected thereto, respectively, The data is transmitted to the first data transmission apparatus 10 via the first to third communication lines 30, 40 and 50.
[0034]
The partial data transmitted to the first data transmission device 10 via the first to third communication lines 30, 40, 50 are the first to third transmission / reception units 14 to 14 in the first data transmission device 10. 16 respectively. The received partial data is demodulated by the first to third transmission / reception units 14 to 16 in a manner corresponding to the first to third communication lines 30, 40 and 50 and supplied to the data combination unit 13. The
[0035]
Next, the data combining unit 13 combines the supplied partial data according to the position data added to each data constituting the partial data at the time of transmission, and the data {b ₁ , b ₂ , b ₃ , b ₄ , b ₅ , b ₆ ,. . . } Is restored and output.
[0036]
As described above in detail, according to the present embodiment, when data is transmitted, on the transmitting side, the input data is divided by the data distribution units 12 and 22, and the position data is added to the divided data. Are distributed to the first to third transmission / reception units 14 to 16 and 24 to 26, respectively, and transmitted using the first to third communication lines 30, 40 and 50. On the receiving side, the data received via the first to third communication lines 30, 40, 50 are combined by the data combining units 13, 23 according to the position data added to the received data. Restore data. Thus, only a part of the transmission data is transmitted to each of the first to third communication lines 30, 40, and 50, so that one communication among the first to third communication lines 30, 40, and 50 is communicated. Even if the line is intercepted, the transmission data is not restored and the security can be improved.
[0037]
Also, according to the number of first to third communication lines 30, 40 and 50 and the respective line speeds, data is divided and distributed by the data distribution units 12 and 22, and a large amount of data such as image data is transmitted. When transmitting, a large amount of data can be transmitted using a communication line with a high line speed, and a small amount of data can be transmitted using a communication line with a low line speed. Can be raised.
[0038]
For example, in the operation example shown in FIG. 3, the ratio of the input data is 3: 2: 1 in accordance with the line speed ratio of 3: 2: 1 of the first to third communication lines 30, 40, 50. All the communication times of the first to third communication lines 30, 40, 50 can be made equal by distributing in the above.
[0039]
In the present embodiment, the number of communication lines is three. However, the present invention is not limited to the number of communication lines. If the number of lines is two or more, Similar effects can be obtained. Further, the communication line may be any of a wired dedicated line, a public line, an optical wireless line, a radio wave line, etc., and each communication line may be the same type or different type.
Further, the unit for dividing the data may be any of byte unit, bit unit, random, and the like.
[0040]
In the present embodiment, when data is divided by the data distributors 12 and 22, position data is added to the divided data, and data is restored based on the position data when the data combiner 13 restores the data. However, the information to be added is not position data indicating the position before the division, but may be information for restoring data that can be restored by the data combining unit 13. In addition, without adding any information to the divided data, a rule for dividing and distributing data is established between the data transmission device on the transmission side and the data transmission device on the reception side that perform data transmission. Also good.
[0041]
In addition, the ranking of data confidentiality is automatically or manually performed on the input data, and only highly confidential data is divided and distributed over a plurality of communication lines according to the confidentiality ranking. In this way, all data with low confidentiality data may be transmitted using one communication line of a plurality of communication lines.
[0042]
In addition, the data transmission apparatus according to the present embodiment can be applied to a system including a plurality of devices (for example, a host computer, an interface device, a reader, a printer, and the like) even if one device (for example, a copying machine and a facsimile device) You may apply to the apparatus which consists of.
[0043]
Also, a software program for realizing the functions of the above-described embodiment for a computer in an apparatus or a system connected to the various devices so that the various devices are operated to realize the functions of the above-described embodiments. What was implemented by supplying the code and operating the various devices according to a program stored in a computer (CPU or MPU) of the system or apparatus is also included in the scope of the present invention.
[0044]
In this case, the program code of the software itself realizes the functions of the above-described embodiments, and the program code itself and means for supplying the program code to the computer, for example, the program code is stored. The recording medium constitutes the present invention. As a recording medium for storing the program code, for example, a floppy disk, a hard disk, an optical disk, a magneto-optical disk, a CD-ROM, a magnetic tape, a nonvolatile memory card, a ROM, or the like can be used.
[0045]
Further, by executing the program code supplied by the computer, not only the functions of the above-described embodiments are realized, but also the OS (operating system) or other application software in which the program code is running on the computer, etc. It goes without saying that the program code is also included in the embodiment of the present invention even when the functions of the above-described embodiment are realized in cooperation with the embodiment.
[0046]
Further, after the supplied program code is stored in the memory provided in the function expansion board of the computer or the function expansion unit connected to the computer, the CPU provided in the function expansion board or function expansion unit based on the instruction of the program code Needless to say, the present invention includes a case where the functions of the above-described embodiment are realized by performing part or all of the actual processing.
[0047]
【The invention's effect】
As described above, according to the present invention, when transmitting sensitive data, only a part of the transmission data is transmitted to each of the plurality of communication lines. Even if one of the communication lines is intercepted, the security can be improved without restoring the data.
[Brief description of the drawings]
FIG. 1 is a block diagram illustrating a configuration example of a system that performs data transmission using a data transmission apparatus according to an embodiment.
FIG. 2 is a diagram for explaining an example of an operation of a system that performs data transmission shown in FIG. 1;
FIG. 3 is a diagram for explaining another example of the operation of the system that performs data transmission shown in FIG. 1;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 1st data transmission apparatus 11, 21 Data distribution / combination part 12, 22 Data distribution part 13, 23 Data connection part 14, 24 1st transmission / reception part 15, 25 2nd transmission / reception part 16, 26 3rd transmission / reception Unit 20 Second data transmission device 30 First communication line 40 Second communication line 50 Third communication line

Claims (13)

A data transmission device that performs data transmission using a plurality of communication lines having different line speeds,
A discriminating means for discriminating the sensitivity of input data;
According to the sensitivity determined by the determination means, determination means for determining whether to transmit the input data divided or transmitted without dividing,
When the determination means determines that the input data is to be divided and transmitted, the input data is divided and distributed to the plurality of communication lines according to the line speed ratio of the plurality of communication lines. Distribution means to
When it is determined that the input data is divided and transmitted by the determination means, the data distributed by the distribution means is transmitted using the plurality of communication lines, respectively, and the input is performed by the determination means. A data transmission apparatus comprising: a transmission unit configured to transmit the input data using one communication line of the plurality of communication lines when it is determined that the data is transmitted without being divided. .   2. The data transmission apparatus according to claim 1, wherein the distribution unit adds position data indicating a position before the division to each of the divided data. Receiving means for receiving the divided data transmitted via the plurality of communication lines;
The data transmission according to claim 2, further comprising: a restoring unit that restores data before division based on the position data added to each of the data received from the plurality of communication lines by the receiving unit. apparatus.   The distribution means distributes the divided data so that transmission times of the plurality of communication lines become equal according to a line speed ratio of the plurality of communication lines. The data transmission device according to any one of the above.   The data transmission device according to claim 1, wherein the plurality of communication lines are different types of communication lines. A data transmission system that performs data transmission using a plurality of communication lines having different line speeds,
A discriminating means for discriminating the sensitivity of input data;
According to the sensitivity determined by the determination means, determination means for determining whether to transmit the input data divided or transmitted without dividing,
When the determination means determines that the input data is to be divided and transmitted, the input data is divided and distributed to the plurality of communication lines according to the line speed ratio of the plurality of communication lines. Distribution means to
When it is determined that the input data is divided and transmitted by the determination means, the data distributed by the distribution means is transmitted using the plurality of communication lines, respectively, and the input is performed by the determination means. When it is determined that the data is transmitted without being divided, a transmission unit that transmits the input data using one communication line of the plurality of communication lines;
Receiving means for receiving the divided data transmitted by the transmitting means via the plurality of communication lines;
A data transmission system comprising: a restoration unit configured to combine the divided data respectively received from the plurality of communication lines by the receiving unit using a predetermined method and restore the data before the division. A data transmission method for performing data transmission using a plurality of communication lines having different line speeds,
In accordance with the sensitivity of the input data, a determination step of determining whether to transmit the input data divided or transmitted without dividing,
If it is determined in the determination step that the input data is divided and transmitted, the input data is divided and distributed to the plurality of communication lines according to the line speed ratio of the plurality of communication lines. When the distributed data is transmitted using the plurality of communication lines, and the determination step determines that the input data is transmitted without being divided, one of the plurality of communication lines is transmitted. And a transmission step of transmitting the input data using a communication line.   8. The data transmission method according to claim 7, wherein when dividing the input data, position data indicating a position before division is added to each of the divided data.   When the divided data transmitted through the plurality of communication lines is received, the data before the division is restored based on the position data added to each received data. Item 9. The data transmission method according to Item 8.   10. The divided data is distributed according to a line speed ratio of the plurality of communication lines so that transmission times of the plurality of communication lines are equal. The data transmission method described in 1.   11. The data transmission method according to claim 7, wherein the plurality of communication lines are different types of communication lines.   6. A computer-readable recording medium in which a program for causing a computer to function as each means according to claim 1 is recorded.   A computer-readable recording medium having recorded thereon a program for causing a computer to execute the processing procedure of the data transmission method according to any one of claims 7 to 11.

Images